Pasadena ADU Builder — Costs, Rules & Loans

Where Pasadena’s ADU rules come from

Every rule on this page is sourced from a primary document: California Government Code §§ 66310–66342 (the state ADU statute, renumbered by SB 477 effective March 25, 2024 — previously Gov. Code §§ 65852.2, 65852.22, and 65852.26), Pasadena Municipal Code (PMC) § 17.50.275 (Pasadena's ADU ordinance, Ord. No. 7420, adopted April 15, 2024, amended periodically to track state-law changes), PMC § 17.50.296 (Pasadena's short-term rental ordinance, Ord. No. 7317), and the Pasadena 2nd Unit ADU Loan Program Handbook (Pasadena Department of Housing, 3rd Round, Rev. 12/2025). No third-party blog content.

Where Pasadena's ordinance and state law don't agree, state law controls — Gov. Code § 66326 gives HCD statutory authority to review local ordinances for compliance, and California ADU law is structured so that cities can meet or exceed the state floor but never drop below it. In practice, that means we run the compliance check two ways on every project (PMC § 17.50.275 and Gov. Code §§ 66310–66342) and submit under whichever path gives you the better result.

Last verified against primary sources on April 23, 2026. State ADU law changes every January 1, and Pasadena amends its ordinance periodically. If you are reading this six months from now, confirm the current version before you commit to a design — or call us and we will confirm it for you.

Pasadena’s historic-district ADU rules

Pasadena has more designated historic resources than any other LA County city — Landmark Districts (such as Bungalow Heaven, Garfield Heights, Madison Heights), Historic Districts, and thousands of individually designated Landmark and Historic Monument properties. If your parcel has any historic designation, an ADU is still legal under state law — but the rules are different.

Is my parcel in a historic district?

Pasadena maintains a public map of designated historic districts and individually designated properties. The categories that trigger historic-preservation review for an ADU:

Landmark District (e.g. Bungalow Heaven).
Historic District (e.g. Madison Heights).
Landmark-designated property (individually designated).
Historic Monument property (individually designated, highest designation).
National Register district (federal designation with state-law protections).

We confirm the historic designation of every Pasadena parcel before we commit to a design. It affects what you can build, where, and how tall.

The visibility-from-right-of-way rule

PMC § 17.50.275.D.4: "Non-Exemption ADUs in individually designated historic properties, Landmark or Historic Districts shall not be visible from the public right-of-way, unless this requirement prevents the creation of the unit." Read that carefully — two things the headline version of this rule gets wrong:

The rule only applies to Non-Exemption ADUs. An "Exemption ADU" under PMC § 17.50.275.B.2 — the 800-sqft detached ADU with 4-ft setbacks, or any conversion ADU within existing permitted space — is NOT subject to the visibility rule. For a historic-parcel owner willing to build at 800 sqft or to convert an existing garage, the visibility test simply does not apply.
Even for Non-Exemption ADUs, the rule has a statutory escape hatch. If the visibility requirement would prevent the ADU from being built at all — for example, a small or narrow lot with no not-visible location — the ordinance's own text suspends it. That escape hatch exists because state law forbids a local rule from eliminating the right to an ADU altogether.

Translated into design terms for a Non-Exemption ADU where visibility applies:

Rear-of-lot placement. Push the ADU as far back from the street as lot geometry allows.
Use the primary house as a visual screen. A detached rear-yard ADU behind an existing craftsman bungalow is usually not visible from the street.
Height cap at 16 feet when visible. Under PMC § 17.50.275.D.5.c.2.a.ii, detached new-construction ADUs in Landmark or Historic Districts and visible from the street are limited to 16 feet — which forecloses the two-story detached option on that lot. Attached ADUs on the primary dwelling, and conversion ADUs, are not limited by this sub-rule.
Conversion ADUs are broadly permitted. Converting an existing permitted garage or accessory structure into an ADU is largely unconstrained by historic-preservation rules, because you are not building new mass — and a detached conversion falls within the Exemption ADU track that skips the visibility rule entirely.

Certificate of Appropriateness and review path

Properties in Landmark Districts, Historic Districts, and individually designated Landmarks require a Certificate of Appropriateness (or similar historic-preservation review) for exterior work. The underlying ADU building permit remains ministerial under state law — Gov. Code § 66321 and § 66326 — but the design itself must satisfy the historic-preservation standard before the building permit issues. For straightforward rear-yard, not-visible-from- street detached ADUs, this is usually a fast administrative review; for anything visible from the street or adjacent to a contributing structure, it can be a Design Commission matter.

Timeline impact

On a non-historic parcel in Pasadena, expect the state 60-day ministerial clock to run more-or-less as intended. On a designated parcel, the historic-preservation review runs in parallel with the building permit; in practice, add a few weeks for a not-visible-from-street design and longer for anything that requires Design Commission sign-off. We build the historic review into the schedule from day one.

What you can build in Pasadena

The numbers below reflect Pasadena's current ordinance (PMC § 17.50.275, Ord. No. 7420) combined with the statewide floor in Gov. Code §§ 66310–66342. California ADU law is structured so that cities can meet or exceed the state minimums but can never drop below them. Where Pasadena's number is lower than the state-law floor, we cite the state floor — because that is the number the City is required to permit by statute.

Number of ADUs per parcel

Single-family lot: per Gov. Code § 66323(a), any combination of (1) one converted ADU within the existing or proposed single-family dwelling or an existing accessory structure, (2) one JADU (≤ 500 sqft, within the single-family footprint, deed-restricted), and (3) one detached new-construction ADU with 4-foot side and rear setbacks. All three in combination are permitted by state statute, regardless of how a local ordinance reads.
Multifamily lot — existing building: per Gov. Code § 66323(a)(4)(A)(ii) (as amended by SB 1211, 2024), up to eight detached ADUs, not to exceed the number of existing primary units. Also permits conversion of non-livable space (storage, boiler rooms, hallways) into ADUs — at least one unit, and up to 25% of the existing unit count, per PMC § 17.50.275.B.2.b.1.a. PMC § 17.50.275.B.2.b.1.b still reads "not more than two detached new construction or conversion ADUs" — that cap predates SB 1211 and is preempted by the current state statute; we submit under state law and document the preemption.
Multifamily lot — proposed building: up to two detached ADUs under Gov. Code § 66323(a)(4)(A)(iii).

Maximum size

Detached new-construction ADU (Non-Exemption): up to 1,200 sqft regardless of bedroom count, per PMC § 17.50.275.D.1.a.2.
Attached new-construction ADU (Non-Exemption): 850 sqft for a studio or 1BR; 1,000 sqft for 2BR or more, per PMC § 17.50.275.D.1.a.2.
Detached Exemption ADU: 800 sqft with 4-ft side/rear setbacks per PMC § 17.50.275.B.2.a.2.a, tracking the Gov. Code § 66321(b)(3) state-law floor. Exemption ADUs skip underlying-zone lot coverage, floor area ratio, and open space constraints — and are not subject to the historic visibility rule (see below).
Conversion ADU: no size limit under PMC § 17.50.275.D.1.a.2 for attached or detached conversions within existing permitted space, plus up to 150 sqft of expansion to accommodate ingress and egress.
JADU: up to 500 sqft, within the single- family dwelling footprint, per Gov. Code § 66333.
Minimum size: 150 sqft of floor area (state efficiency-dwelling-unit floor).

The Westwood Signature Home — 1 BR, 550 sqft, modern farmhouse exterior — fits Pasadena's Craftsman scale — **The Westwood** — 1 BR, 550 sqft, modern farmhouse exterior. Sits well under Pasadena’s 1,200 sqft cap for detached ADUs (PMC § 17.50.275) and complements the city’s Craftsman scale.

Maximum height

Detached ADU — state-law floor: 16 feet minimum per Gov. Code § 66321(b)(4)(A); 18 feet on a lot with an existing or proposed single-family dwelling, plus 2 feet extra to match roof pitch, per § 66321(b)(4)(B)–(C); 25 feet and 2 stories on a lot with an existing or proposed multifamily dwelling or when attached to the primary dwelling, per § 66321(b)(4)(D).
Attached new-construction ADU: PMC § 17.50.275.D.5.c.1 permits up to 25 feet and 2 stories (or the underlying zone limit, whichever is less). Gov. Code § 66321(b)(4)(D) guarantees 25 feet and two stories for any ADU attached to the primary dwelling — the second story is a right, not a discretionary option.
Landmark and Historic Districts — visibility rule: new detached ADUs in a Landmark District, Historic District, or on a Landmark-designated property are limited to 16 feet when visible from the public right-of-way. ADUs not visible from the public right-of-way follow the base standards.
Hillside Overlay: additional height restrictions may apply; verify for every hillside parcel.

Setbacks and separation

Side and rear setbacks: 4 feet minimum (Gov. Code § 66321(b)(3)), regardless of what PMC § 17.50.275 otherwise requires.
Front setback: per PMC § 17.50.275.D.5.a.1, new ADUs must comply with the front- yard setback of the underlying zone. Under Gov. Code § 66321(b)(3), that restriction cannot be used to prevent an 800-sqft ADU with 4-foot side and rear setbacks from being built if there is no other feasible location on the lot — the 800-sqft / 4-ft-setback floor is a statutory right that overrides lot coverage, floor area ratio, and open space limits.
No setback required for an ADU that reuses an existing permitted living area or accessory structure, or for a structure rebuilt in the same location and dimensions — including existing unpermitted structures built before January 1, 2020 (AB 2533, 2024; Gov. Code § 66332).
Building separation (Non-Exemption ADUs): minimum 6 feet eave-to-eave between a newly constructed ADU and any other structure on the site, per PMC § 17.50.275.D.5.b.

The Sunset Signature Home — 1 BR, 480 sqft, modern farmhouse exterior — Pasadena starter ADU — **The Sunset** — 1 BR, 480 sqft, modern farmhouse exterior. Reads naturally next to a Craftsman, Spanish, or Mid-Century Pasadena bungalow without copying it.

Parking

Pasadena's own parking exemptions — PMC § 17.50.275.D.6.a.1. Pasadena's ordinance nominally requires one on-site space per unit or per bedroom (whichever is less), but waives the requirement entirely when any of the following applies: (a) the site is within a half-mile walking distance of a public transit stop; (b) the ADU is contained within the proposed or existing space of the primary dwelling or an accessory structure; (c) the property is within a historic district (Landmark or Historic District); (d) a commercial car-share pickup/drop-off location is within one block; or (e) the ADU application is submitted with a new primary-dwelling application. Most of central Pasadena qualifies under (a) or (c).
Gov. Code § 66323 "exemption ADU" units — no parking required. Under Gov. Code § 66323(b), no parking or on-site design standard not contained in § 66323 itself may be imposed on an ADU that meets the § 66323 criteria (most conversion ADUs, ADUs within a half-mile of transit, ADUs in historic districts, and similar). This is the most common Pasadena ADU scenario.
Transit-proximity and car-share exemptions. Gov. Code § 66322(d) and AB 2097 (2022) eliminate parking requirements for ADUs within a half-mile of a major transit stop, in a car-share zone, or when part of a historic district. The Pasadena historic-district exemption runs in parallel with state law — either can be invoked.
Replacement parking. PMC § 17.50.275.D.6 aligns with Gov. Code § 66322(d)(3): no replacement parking is required when an existing garage, carport, or surface space serving the primary dwelling is demolished or converted in conjunction with the ADU. SB 1211 (2024) extended this to uncovered off-street parking statewide.

Development fees — Pasadena's tiered ADU incentive

Pasadena actually offers one of the more aggressive ADU fee-incentive structures in LA County. Incentives adopted effective May 6, 2025 (with Residential Impact Fee and Construction Tax exemptions effective July 17, 2025), layered on top of Gov. Code § 66324 (no impact fees on any ADU under 750 sqft; proportional fees above):

ADU ≤ 900 sqft (no Housing Agreement): 50% plan check discount, exempt from Residential Impact Fees (RIFs), 25% reduction on Construction Tax, General Plan, and Technology fees. $1,000 Construction & Demolition deposit.
ADU of any size with a recorded Housing Agreement: 50% plan check discount, exempt from RIFs, exempt from Construction Tax, General Plan, and Technology fees. $1,000 C&D deposit. This is the richest incentive tier — built for an ADU that will be rent-restricted or deed-restricted to affordable income levels. (The Second Unit ADU Loan Program above uses this track.)
ADU built on a City Standard (Preapproved) Plan: 50% plan check discount, exempt from RIFs, exempt from multiple fees. $1,000 C&D deposit. Priced to move homeowners toward the pre-approved catalog.
All other ADUs: standard fees apply, $1,000 C&D deposit. Residential Impact Fees apply to ADUs greater than 900 sqft unless exempted via a Housing Agreement.

Pasadena's standard building-permit and plan-check fees are based on project valuation (not on the fact that you are building an ADU), plus utility connection fees where required. Pasadena Water and Power is the utility for most of the city, which means the utility-connection fee path is different from a SoCal Edison city. Your Backyard Review includes a line-item pass-through estimate and tells you which fee tier your project lands in.

The dual-track option: state standards as an alternative

For every Pasadena project we run the compliance check two ways: (1) under PMC § 17.50.275 as written, and (2) under the Gov. Code §§ 66310–66342 state-mandated standards. Where state law is more generous, we submit under state law and cite the preemption. That dual-track analysis is structural to California ADU law — Gov. Code § 66326 gives HCD authority to review local ordinances for compliance, and cities cannot drop below the statewide floor. Our job is to make sure you get the better of the two numbers on every standard.

Three Signature Homes for Pasadena

One-story designs that handle the historic-district visibility review smoothly. Fixed pricing. Architect-designed. Permit-ready in Pasadena.

The Sunset

1 BR / 1 BA · 480 sqft

$239,000 all-inclusive i

See model →

The Melrose

2 BR / 2 BA · 800 sqft

$329,000 all-inclusive i

See model →

The Lincoln

3 BR / 2 BA · 1000 sqft

$389,000 all-inclusive i

See model →

Permitting your ADU in Pasadena

Ministerial review, not discretionary. Gov. Code § 66321(a) requires Pasadena to approve or deny a complete ADU application without discretionary review or public hearing. No design review, no neighbor notice, no Planning Commission — except where historic-preservation review applies.
60 days from a complete submittal. Gov. Code § 66317(a) requires action within 60 days of a complete application. For ADUs permitted alongside a new primary dwelling, the clock runs with the primary dwelling's review.
Pasadena's permit counter. Applications go through the Pasadena Planning & Community Development Department — Building & Safety Division and Zoning Administrator. Historic-district projects loop in Design & Historic Preservation staff.
Standard plan-check fees apply. Based on project valuation, not on the fact that you are building an ADU. Separate from the impact-fee exemption under Gov. Code § 66324.

The preapproved ADU program (AB 1332)

California AB 1332 (2024) required every city to establish a preapproved ADU plan program by January 1, 2025. Pasadena runs its version as the "ADU Standard Plans Program," offering a catalog of pre-approved plans ranging from studios to 2-bedroom units. Once a plan is on the approved list, homeowners can adopt it and the site-specific package gets expedited review and preferential fee treatment (see Development fees above).

The critical constraint buried in the City's own program page: "Modifications to pre-approved ADU plans are not allowed, regardless of how minor the changes are." That's a direct quote. If a pre-approved plan happens to fit your lot geometry, family program, and aesthetic preferences exactly as drawn, the program is fast and cheap. If not — different orientation, different window placement, different kitchen layout, different finishes, different roof line — the program is closed to you, and any deviation means starting over as a custom submittal.

CALI ADU does not participate in Pasadena's Preapproved ADU Program. We build our Signature Homes as a full design-build package, not as inventory on a City-managed catalog. Our Signature Homes are individually permitted on your lot, engineered from day one to clear PMC § 17.50.275 and the Gov. Code §§ 66310–66342 state-law floor where it applies, and adaptable to your site's actual conditions (historic designation, setback geometry, grade, utilities). If you want the fastest possible permit and are willing to build a pre-approved plan with zero changes, the City program is a real option. If you want a fixed-price design-build partner that understands Pasadena's historic-preservation overlay and the state-law preemption rules cold, that is us.

Pasadena’s $225K ADU construction loan program

Pasadena is one of very few LA County cities that offers its own publicly funded ADU construction loan program. Most builders don't mention it, because the program doesn't fit a premium design-build budget. It's worth knowing about anyway: for the right household, it is the cheapest ADU capital available in Southern California.

What the program is

The Pasadena Second Unit ADU Loan Program, administered by the Pasadena Department of Housing, offers up to $225,000 in construction financing at 1% simple interest with a three-year deferred-payment term. Payments are deferred during construction; once the ADU is complete and rented to a Pasadena Housing Choice Voucher (HCV) tenant for six continuous months, up to $100,000 of the principal converts to a 20-year silent third mortgage at 0% interest and the remaining balance is refinanced into a conventional mortgage. The program is funded by the state's Permanent Local Housing Allocation (PLHA) and CalHOME programs — not City general funds — and the money is real.

What you have to agree to

Rent to a Pasadena HCV tenant for 7 continuous years. The Housing Choice Voucher program (Section 8) pays the market-rate rent directly to the landlord on behalf of the tenant. Rents are set by HUD's Fair Market Rent schedule for Pasadena and are competitive with the lower end of private-market rent.
Five-year affordability covenant recorded against title. The covenant survives resale — if you sell the property during the covenant period, the buyer must honor the remaining term.
Owner-occupancy of the main house for the life of the loan. You must live in the primary dwelling; the ADU cannot be used to turn the whole parcel into a rental.
No short-term rentals. Stays of less than 30 days are prohibited for the life of the loan.

Program constraints you should know up front

ADU size capped at 750 sqft. The program will not finance larger ADUs, even though state law and Pasadena's ordinance allow up to 1,000 sqft detached.
Pre-approved plans required for new detached ADUs. Loan participants must build one of the City's catalog plans. Custom design is not eligible.
Not available on historic structures. Properties with Landmark or Historic Monument designation are excluded, as are properties in some Landmark and Historic Districts — verify with the City's Housing Department before investing in an application.
Junior ADUs and condominium parcels are not eligible. Single-family detached parcels with a new or converted ADU only.
Credit and equity underwriting applies. Typical thresholds: credit score > 650, debt-to-income ratio < 40%, combined loan-to-value < 80%.

Who the program actually fits

The loan program is a real solution for a specific kind of Pasadena homeowner: you own your home, you have equity and decent credit, you are willing to rent to a voucher tenant for seven years, and a 750-sqft pre-approved ADU plan meets your needs. For a family building a small unit for long-term rental income where the 1% interest rate meaningfully beats a HELOC or construction loan, it pencils.

It does not fit: investors, non-owner- occupants, buyers who want a larger or custom design, historic-property owners whose parcel is excluded, or anyone planning to sell within the covenant period.

Where CALI ADU fits — and doesn't

Our Signature Homes are not currently in Pasadena's pre-approved catalog, and most of our lineup is sized above the program's 750-sqft cap. We do not participate in the loan program today. We flag it during every Pasadena Backyard Review because it is the cheapest ADU capital you can find in LA County, and in some household situations it is the right call.

If you have already decided to pursue the loan program, work directly with the Pasadena Department of Housing and a contractor enrolled in the program. If you are weighing the loan program against private financing for a larger Signature Home, your Backyard Review includes the math both ways: 750-sqft pre-approved plan at 1% interest vs. a 1,000–1,200 sqft premium two-story at private construction- loan rates. For many households the premium path produces more gross rent, more resale value, and fewer long-term constraints — but that is a decision that turns on your specific numbers.

Read the handbook or apply: cityofpasadena.net/housing/community-development/second-unit-adu-program

Terms summarized from the Pasadena 2nd Unit ADU Loan Program Handbook (3rd Round, Rev. 12/2025). Program terms, funding availability, and eligibility change between funding rounds; confirm the current handbook before committing.

Can you Airbnb a Pasadena ADU?

Pasadena's ADU ordinance contains an ADU-specific rental- term prohibition that rules this out categorically. PMC § 17.50.275.C.1: "Any rental term of an accessory dwelling unit or Junior ADU that was legally created on or after January 1, 2017 shall be longer than 30 days." Every ADU we would build today is by definition created after January 1, 2017, which means no sub-30-day rental is permitted — hosted or unhosted, owner on-site or not. This is not a residency test, a permit hurdle, or a platform restriction. It is a flat bar in the zoning code.

The broader Pasadena short-term rental ordinance (PMC § 17.50.296, Ord. No. 7317) regulates short-term rentals of the primary dwelling in the usual Type 1 (hosted, operator present) and Type 2 (unhosted) buckets, with a nine-month-per-year primary-residence requirement for the operator. But § 17.50.296 does not open a door that § 17.50.275.C.1 closes for ADUs specifically. If you are building an ADU in Pasadena, the income model is 30+ day tenancy only.

Practical implications:

No platform listing strategy. Airbnb, Vrbo, Furnished Finder under-30-day, and similar listings are not available paths for a post-2017 Pasadena ADU.
Mid-term / corporate rental still works. 30-day minimum is the clean dividing line. Furnished 30+ day rentals to corporate relocation, traveling medical, film industry, and academic tenants are fully compliant and often price at a premium to unfurnished 12-month rents.
Long-term rental is the base case. Standard 12-month residential lease. Exempt from Costa- Hawkins rent-ceiling controls as a post-1995 unit; AB 1482 may still apply — see the rental income section below.

AB 1154 (Chapter 507, Statutes of 2025, effective January 1, 2026) adds a statewide 30+ day rental requirement for JADUs at Gov. Code § 66333(g), so even without Pasadena's own rule, state law would prohibit sub-30-day JADU rentals.

Why two-story ADUs work on Pasadena lots

Pasadena's typical single-family lot is 6,000 to 10,000 sqft — larger than Santa Monica's, but commonly carrying a bigger primary house, mature landscaping, and in many neighborhoods a detached existing garage. Subtract the house footprint, the 4-foot side and rear setbacks, and the front setback, and the buildable rear yard can disappear fast — especially on the narrower Pasadena lot geometries in Madison Heights, Bungalow Heaven, and Garfield Heights.

A two-story ADU solves the problem by stacking the program. The same 1,000–1,200 sqft fits on a footprint half the size. You keep your rear yard, you keep sight lines from the primary home, and — on a non-historic parcel — you comply with Gov. Code § 66321(b)(4)(C) / PMC § 17.50.275's two-story standards. On a historic- district parcel, the two-story detached option is available only if the ADU is not visible from the public right-of-way; on those lots, pushing the unit to the rear of a deep lot behind the primary house often makes it work.

Three of our Signature Homes are two-story and designed specifically for this condition:

The Fairfax ADU — 2BR/1.5BA, 840 sqft, 448 sqft footprint. The smallest two-story option we build. Good fit for narrower Pasadena lots.
The Venice ADU — 2BR/2BA, 1,080 sqft, 540 sqft footprint. Our most popular two-story for lots where yard space is at a premium.
The Culver ADU — 3BR/2.5BA, 1,200 sqft, 600 sqft footprint. Sized at the ceiling state law permits for a 2BR+ detached ADU, on the minimum feasible footprint.

All three are engineered to clear PMC § 17.50.275 and Gov. Code §§ 66310–66342 floors. If your parcel is in a Landmark or Historic District, we run the visibility-from- right-of-way analysis before committing to two stories. See the full two-story collection.

Recent state-law changes that apply in Pasadena

California ADU law has been amended almost every year since 2017. Pasadena's ordinance is required to comply with the current state statute even where the City has not formally updated its own text. The changes that matter right now:

SB 477 (effective March 25, 2024). Renumbered the state ADU law from Gov. Code §§ 65852.2 / 65852.22 / 65852.26 into Gov. Code §§ 66310–66342. Substantive law largely unchanged, but every ordinance still citing the old numbers is now referring to sections that no longer exist. Pasadena's ordinance uses the new numbers where it has been re-adopted and the old numbers where it hasn't; we cite the current statute on every application.
SB 1211 (2024). On multifamily parcels, up to eight detached ADUs are now allowed (up from two), not to exceed the number of existing or proposed primary units. Also eliminated the requirement to replace uncovered off-street parking lost to ADU construction.
AB 1154 (Chapter 507, Statutes of 2025; effective January 1, 2026). Amended Gov. Code § 66333, the JADU statute. Two material changes in Pasadena: (1) owner-occupancy of the main house is now required only if the JADU shares sanitation facilities with the existing structure — if the JADU has its own bathroom, no owner- occupancy is required under § 66333(b); and (2) JADUs must be rented for terms longer than 30 days under § 66333(g), which runs in parallel with Pasadena's own § 17.50.275.C.1. The § 66333(c) deed-restriction requirement (prohibiting separate sale of the JADU and recorded against title) is unchanged. PMC § 17.50.275.E.3 still states owner-occupancy of either the primary unit or the JADU is required without a shared-sanitation carve-out; that provision is now narrower than Gov. Code § 66333(b) and state law preempts.
AB 1332 (2024). Every city, including Pasadena, must offer a preapproved ADU plan program by January 1, 2025. Pasadena has.
AB 2533 (2024). Amnesty for unpermitted ADUs and JADUs built before January 1, 2020. Pasadena cannot deny a permit to legalize such a unit on the basis of building code violations, provided the structure is not substandard. Codified at Gov. Code § 66332.
AB 1308 (effective January 1, 2024). Prohibits cities from imposing new parking requirements for additions to single-family residences, regardless of size, unless the resulting dwelling exceeds the size limits of the underlying zoning district. Pasadena is amending PMC Chapter 17.46 to comply.
AB 2097 (2022). No parking requirement for any residential or mixed-use project within one-half mile of a major transit stop. Much of central Pasadena qualifies — particularly the Metro A Line (Gold Line) corridor.
AB 1033 (2023) — Pasadena has not opted in. AB 1033 (Gov. Code § 66341) allows cities to permit ADUs to be sold separately from the primary dwelling as condominiums. Pasadena has not adopted an enabling ordinance as of April 2026. One narrow pre-existing exception under PMC § 17.50.275.C.2 allows separate sale of an ADU developed by a qualified nonprofit under Gov. Code § 66340 (former § 65852.26) to an income- qualifying buyer — an affordable-housing pathway, not a typical homeowner exit. If ADU-as-condo separate sale is a must-have in your LA-area search, Santa Monica (SMMC § 9.31.026) has opted in.

What an ADU costs in Pasadena (2026)

Our Signature Homes are fixed price. Same model, same number, whether the lot is in Pasadena, Santa Monica, or the Valley. Here is the lineup:

Model	Configuration	Size	Collection	Fixed price
The Wilshire	Studio / 1BR	400 sqft	Single-story	$219Ki
The Sunset	1BR/1BA	480 sqft	Single-story	$239Ki
The Westwood	1BR/1BA	550 sqft	Single-story	$259Ki
The Laurel Canyon	2BR/1BA	660 sqft	Single-story	$289Ki
The Melrose	2BR/2BA	800 sqft	Single-story	$329Ki
The Fairfax	2BR/1.5BA	840 sqft	Two-story	$339Ki
The Lincoln	3BR/2BA	1,000 sqft	Single-story	$389Ki
The Venice	2BR/2BA	1,080 sqft	Two-story	$399Ki
The Culver	3BR/2.5BA	1,200 sqft	Two-story	$459Ki

The Lincoln Signature Home — 3 BR / 2 BA, 1,000 sqft single-story Craftsman ADU, $389,000 all-inclusive — fits Pasadena's larger residential lots — **The Lincoln** — 3 BR / 2 BA, 1,000 sqft, $389,000 all-inclusive. Single-story and right-sized for Pasadena’s larger residential lots — the most family-ready 1-story Signature Home in the lineup.

Fixed price. Not an estimate, not a range, not a "starting at." The number in the table is the number on the contract. We can quote it because our Signature Homes were engineered to clear PMC § 17.50.275 and Gov. Code §§ 66310–66342 on paper — and because we control the whole stack from design to permit to construction partner.

What is not in that number: your standard Pasadena building-permit and plan-check fees (based on valuation, payable directly to the City), utility connection fees (Pasadena Water and Power, SoCal Gas), and — if your parcel is in a Landmark or Historic District — your historic-preservation review fee. Your Backyard Review includes a line-item estimate of those pass-through costs for your specific lot.

For sizing and payback math: try our ADU calculator and the ROI calculator.

Renting your Pasadena ADU

Pasadena bans sub-30-day rentals on any ADU built after January 1, 2017 (PMC § 17.50.275.C.1). So Pasadena ADU economics are long-term only.

That works in owners’ favor. Pasadena’s long-term rental market is strong, and supply of high-quality detached rentals is tight. Demand is steady near the Metro A Line, Old Pasadena, South Lake, and the Caltech/Huntington corridor.

Here’s what each Signature Home rents for in Pasadena today:

Model	Config	Size	Fixed price	Directional Pasadena monthly rent
The Wilshire	Studio / 1BR	400 sqft	$219Ki	$2,200 – $2,700
The Sunset	1BR/1BA	480 sqft	$239Ki	$2,500 – $3,000
The Westwood	1BR/1BA	550 sqft	$259Ki	$2,700 – $3,200
The Laurel Canyon	2BR/1BA	660 sqft	$289Ki	$3,000 – $3,600
The Melrose	2BR/2BA	800 sqft	$329Ki	$3,400 – $4,000
The Fairfax	2BR/1.5BA (2-story)	840 sqft	$339Ki	$3,500 – $4,100
The Lincoln	3BR/2BA	1,000 sqft	$389Ki	$4,100 – $4,900
The Venice	2BR/2BA (2-story)	1,080 sqft	$399Ki	$3,900 – $4,600
The Culver	3BR/2.5BA (2-story)	1,200 sqft	$459Ki	$4,600 – $5,600

For payback math keyed to your specific lot and financing assumptions, use the ADU ROI calculator.

Newly constructed ADUs first occupied after February 1, 1995 are generally exempt from California rent-ceiling controls under the Costa-Hawkins Rental Housing Act (Civ. Code § 1954.50 et seq.). California's statewide rent-cap framework under AB 1482 (Civ. Code § 1947.12) may still apply, depending on the ADU's structure and ownership profile — confirm before you lease.

The rent ranges above are directional market estimates based on publicly available Pasadena listings for comparable 30+ day rentals. They are not a guarantee. Your specific ADU's performance depends on finish level, lot, access, parking, historic designation, and the rental market at the time you lease. Ranges reflect typical variability between a "good" and "very good" Pasadena micro-location; truly premium blocks (near Old Pasadena, South Lake, or parts of Madison Heights and Oak Knoll) can exceed the high end.

Why Pasadena is a top ADU market in LA County

Pasadena has more regulatory friction than most LA County jurisdictions: its own municipal ordinance (PMC § 17.50.275), widespread historic-district designations, and STR rules that preclude pure-income Airbnb plays. Why build here anyway?

Deep inventory of strong ADU lots. Pasadena's single-family parcels are larger than Westside averages — 6,000–10,000 sqft is typical — and frequently back onto alleys or have rear yards deep enough to take a two-story detached ADU without touching the street frontage.
State law is the backstop on every project. PMC § 17.50.275 is the starting point; Gov. Code §§ 66310–66342 is the statutory floor. When the two numbers disagree, state law wins — and we submit under whichever path gives you the better result.
Two-story detached ADUs are available on most non-historic lots. Gov. Code § 66321(b)(4)(C) gives you 18 feet plus pitch on a single-family detached ADU, and 25 feet / 2 stories where attached to the primary dwelling. On deep lots behind the house, the two-story option unlocks real yield.
Strong long-term rental demand. Caltech, Huntington Hospital, the Metro A Line, and the Old Pasadena / South Lake employment base keep long- term rental supply tight and rents firm.
Property values among the most stable in LA County. Pasadena's Historic Preservation Ordinance and its deep architectural stock protect resale values. A fully permitted ADU adds square footage that comps directly into resale on a market where premium comps are well-supported.
Ministerial approval is real — where it applies. On a non-historic parcel, Gov. Code § 66321 and § 66326 strip the City of discretionary review. No neighbor appeal. No Planning Commission meeting. The 60-day clock runs.
An optional public-sector loan pathway. Homeowners willing to rent to a Pasadena Housing Choice Voucher tenant for seven years can tap up to $225,000 of 1%-interest construction financing through the City's Second Unit ADU Loan Program — see the section above. Narrow fit, but a real option most builders won't mention.

Pasadena ADU questions, answered

The questions Pasadena homeowners actually ask before they start — with citations to PMC § 17.50.275 and California Gov. Code §§ 66310–66342.

Does Pasadena allow two-story ADUs?

Yes — with conditions that vary by attachment and location. PMC § 17.50.275.D.5.c.1 allows attached new-construction ADUs up to 25 feet and two stories (or the underlying zone’s limit, whichever is less) when attached to a single-family dwelling. PMC § 17.50.275.D.5.c.2.b allows detached new-construction ADUs up to 18 feet and two stories outside Hillside Overlay Districts and outside the visible-from-street area of Landmark or Historic Districts — with an additional 2 feet of height permitted within ½ mile of a Major Transit Stop or High Quality Transit Corridor when needed to match the primary dwelling’s roof pitch.

Detached new-construction ADUs in Landmark or Historic Districts and visible from the street are limited to 16 feet (PMC § 17.50.275.D.5.c.2.a.ii). State law (Gov. Code § 66321(b)(4)(D)) guarantees 25 feet and two stories where the ADU is attached to the primary dwelling or on a multifamily lot, which preempts any more restrictive local rule.

Can I build an ADU on a property in a Pasadena historic district?

Yes, with conditions. PMC § 17.50.275.D.4 requires Non-Exemption new-construction ADUs in Landmark Districts, Historic Districts, and individually designated Landmark or Historic Monument properties to be not visible from the public right-of-way, unless that requirement prevents the creation of the unit.

Exemption ADUs under PMC § 17.50.275.B.2 — 800 sqft detached new construction with 4-ft setbacks, or any conversion ADU within existing permitted space — are not subject to the visibility rule. A Certificate of Appropriateness or similar historic-preservation review may be required; the underlying ADU building permit remains ministerial under Gov. Code § 66321.

How large an ADU can I build in Pasadena?

Under PMC § 17.50.275 and Gov. Code §§ 66321–66323 as applicable, detached new-construction ADUs are permitted up to 1,200 sqft regardless of bedroom count (PMC § 17.50.275.D.1.a.2). Attached new-construction ADUs are limited to 850 sqft for a studio or 1-bedroom, and 1,000 sqft for 2-bedroom or larger.

State law (Gov. Code § 66321(b)(3)) also guarantees at least 800 sqft with 4-ft side and rear yard setbacks regardless of lot coverage, FAR, or open space limits. Conversion ADUs created within an existing single-family dwelling or accessory structure may reuse the existing footprint under Gov. Code § 66323 with no size limit.

Can I rent a Pasadena ADU on Airbnb?

No. PMC § 17.50.275.C.1 states that any rental term of an ADU or JADU legally created on or after January 1, 2017 shall be longer than 30 days. Every new Pasadena ADU falls under this rule, which categorically prohibits short-term rental — hosted or unhosted, owner on-site or not.

The general short-term rental ordinance (PMC § 17.50.296) regulates STR of the primary dwelling but does not override the ADU-specific 30+ day floor. A Pasadena ADU must be operated as a 30+ day rental, a family unit, or a home office. AB 1154 (Chapter 507, Statutes of 2025, effective January 1, 2026) adds a parallel statewide 30+ day rental requirement for JADUs at Gov. Code § 66333(g).

Does Pasadena offer a loan program to help me build an ADU?

Yes — Pasadena’s Second Unit ADU Loan Program offers up to $225,000 in construction financing at 1% simple interest with a three-year deferred-payment term, for homeowners who agree to rent the completed ADU to a Pasadena Housing Choice Voucher tenant for seven continuous years. The program is administered by the Pasadena Department of Housing and funded through the state’s Permanent Local Housing Allocation (PLHA) and CalHOME programs.

Tradeoffs: the ADU is capped at 750 sqft, new detached ADUs must use City pre-approved plans, historical structures and junior ADUs are not eligible, and a five-year affordability covenant is recorded against the property. CALI ADU does not participate in the program — our Signature Homes start at 400 sqft and go up to 1,200 sqft with custom design-build — but we will flag the program during your Backyard Review if it fits your situation. Apply or read the handbook at cityofpasadena.net/housing/second-unit-adu-program/.

Can a Pasadena ADU be sold separately from the main house?

Almost never. AB 1033 (2023), codified at Gov. Code § 66341, permits cities to adopt a local ordinance allowing ADUs to be sold separately as condominiums — but the city must affirmatively opt in, and Pasadena has not adopted an AB 1033 ordinance as of April 2026.

PMC § 17.50.275.C.2 does permit one narrow exception: an ADU developed by a qualified nonprofit corporation in accordance with California Gov. Code § 66340 (former § 65852.26) may be sold separately to a qualifying affordable-housing buyer. That pathway is for affordable-housing developers, not for a typical homeowner exit. If AB 1033 separate sale is a must-have, Santa Monica (SMMC § 9.31.026) and Culver City (CCMC § 17.400.096) are LA-area cities that have opted in.

Building an ADU in Pasadena.
Rules, permits, design, fee incentives, and real 2026 costs — written from primary sources.

Where Pasadena’s ADU rules come from