Building an ADU in Bradbury. Rules, costs, timeline.

Can I build an ADU in Bradbury?

Everything in this section comes from Bradbury Development Code Chapter 85, Articles I and II (§§ 9.85.010 to 9.85.160), read together with the residential zone standards at Chapters 61, 64, 67, 70 and 73 and cross-checked against Gov. Code §§ 66310–66342 and the HCD ADU Handbook (March 2026).

Five things to know before you start

The five points a planner would raise first, before any regulation gets explained.

How many units a Bradbury lot can carry

Section 9.85.140 is the part of the chapter that does the heavy lifting. It opens “[n]otwithstanding any other provision of this chapter” and requires the City to approve certain categories ministerially, subject only to the provisions of that section — which means the local development standards in § 9.85.130 do not reach them. Those are the units Gov. Code § 66323 requires every California city to permit, and the ones where the local rulebook is thinnest.

An existing nonconformity is not your problem

This matters on older Bradbury parcels, where a barn, stable, pool house or guest structure may predate the current code or sit inside a setback the zone now requires. None of it has to be cured first. Section 9.85.115(b) bars the City from denying an ADU or junior ADU application because of a nonconforming zoning condition, a building code violation or an unpermitted structure, unless that condition both threatens public health and safety and is affected by the ADU’s construction. Section 9.85.140(b) says the same thing again for the mandatory-approval categories: the City “shall not require the correction of legal, nonconforming zoning conditions as a condition of permit approval.” And for a junior ADU, § 9.85.150(h) repeats it a third time.

A unit built before January 1, 2020 gets more than that. Section 9.85.115(c) bars denial of a permit for a pre-2020 ADU on the ground that it violates building standards or fails to comply with state law or the Development Code, unless the City finds the correction necessary to satisfy Health & Safety Code § 17920.3. A City inspector may inspect and recommend what the unit needs, and the City “shall not penalize an applicant for having the unpermitted ADU or JADU” (§ 9.85.115(c)(4)). Until January 1, 2030 the City must also issue a notice with every ADU building-code correction order telling the owner they may apply to the City Manager for a five-year delay in enforcement where public health and safety is not at stake (§ 9.85.160(h)). The parallel state provisions sit at Gov. Code § 66311.7 for the denial bar, the fee bar and the inspection right, and at Gov. Code § 66331 with Health & Safety Code § 17980.12 for the five-year enforcement delay itself.

Owner-occupancy

You do not have to live there. Section 9.85.160(c)(1) is blunter than most city codes manage: “The City shall not enforce any owner/occupancy requirement imposed on an ADU. No owner/occupancy requirement shall be imposed on any ADU.” That is Gov. Code § 66315, adopted rather than waited out.

Junior ADUs are the exception, and here the local text is behind the statute. Section 9.85.150(f)(4) requires a recorded deed restriction stating that the owner resides in either the primary unit or the junior ADU, waived only where the owner is a governmental agency, land trust or housing organization. AB 1154, effective January 1, 2026, amended Gov. Code § 66333(b) so that the requirement applies only where the junior ADU shares sanitation facilities with the primary dwelling. Bradbury’s ordinance was adopted in July 2025 and is written categorically, so it does not reflect that narrowing yet. State law preempts.

What an ADU costs in Bradbury (2026)

Our Signature plans are fixed-price — architectural design and full permit processing included, the same number whether the lot is in Bradbury, Arcadia or the Westside. Construction is separate: once your plans are permitted, you build it yourself, bring your own licensed contractor, or build with one of our vetted construction partners. The figures below are the estimated cost to build each model with an independent licensed general contractor.

Only the six single-story plans appear here. The three two-story Signature Homes are detached buildings of roughly 25 feet and cannot be permitted on a Bradbury lot as drawn, so quoting them on this page would be quoting something you cannot build.

What is fixed is the plan: our Signature plan fees run $7,490 to $12,990 — architectural design and full permit processing included. We can price it because the Signature Homes were engineered to pass objective ADU standards on paper, and Bradbury’s standards in Chapter 85 are objective throughout. The build figures above are an estimate by an independent licensed general contractor: your plans, your choice of builder.

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

Development fees, and what Bradbury adds

Two square-foot thresholds do most of the work, and both come from state law before they come from the ordinance. An ADU of 750 square feet or less pays no impact fee at all (§ 9.85.130(j)(1); Gov. Code § 66311.5(c)(1)). Above that line, § 9.85.130(j)(2) requires impact fees to be charged proportionately in relation to the square footage of the primary unit — stated the right way round, which is not universal in Los Angeles County — and says so notwithstanding any fee resolution to the contrary. A unit under 500 square feet does not increase assessable space and so escapes school fees (Gov. Code § 66311.5(c)(3)). “Impact fee” is defined at Gov. Code § 66311.5(c)(2) — the local cross-reference at § 9.85.130(j)(4) still points at the former § 66324, which SB 543 renumbered effective January 1, 2026 — and all applicable public service and recreation impact fees are payable before occupancy (j)(3).

One rule cuts the other way and it is the single largest saving available here. For an ADU contained within an existing primary unit or an existing accessory structure meeting § 9.85.140(a)(1), the City may not require a new or separate utility connection and may not impose a connection fee or capacity charge at all, unless the ADU was built with a new single-family dwelling (§ 9.85.130(i)(1)). Every other ADU does need its own connection, at a charge proportionate to the burden measured by size or drainage fixture unit values (i)(2). On a Bradbury estate lot with a long run back to the main house, that connection is a real line item and it is worth pricing before you choose between converting and building new.

The City charges a filing and processing fee with every application, in an amount set by City Council resolution (§§ 9.28.040, 9.85.110(b)), and ADUs are subject to applicable inspection and permit fees (§ 9.85.110(c)). Bradbury does not publish a standalone ADU fee figure, and building-permit and plan-check fees are valuation-based, so a sensible budget prices them for your specific valuation rather than from a headline number. Your Backyard Review includes a line-item estimate of the pass-through costs for your lot.

What it returns: renting your ADU

A Bradbury ADU is a long-term rental asset or it is family housing. Short-term rentals of an ADU or junior ADU are prohibited outright (§ 9.85.160(b)(1)), the mandatory-approval units carry a 31-day floor (§ 9.85.140(c)), the junior-ADU deed restriction carries the same floor for both units (§ 9.85.150(f)(3)), and the zoning districts themselves list short-term rentals among the uses expressly prohibited (§§ 9.61.030(c), 9.67.030(c)). State law is marginally stricter than a flat 30 days: Gov. Code § 66323(e) requires a term longer than 30 days for the state-mandated units and § 66333(g) the same for a junior ADU. Write the lease for 31 days or more. The unit may be rented separately from the primary (§ 9.85.160(b)(2)).

The trusted benchmark is HUD’s Fair Market Rent for the Los Angeles–Long Beach–Glendale metro area. Read it as a floor rather than a forecast, and in Bradbury read it as a low floor: the figure is calculated across all of Los Angeles County and every age and class of housing stock, so a new detached unit on a foothill estate lot is not the property it describes.

HUD Fair Market Rents for the Los Angeles–Long Beach–Glendale HUD Metro FMR Area, FY 2026 as revised, effective May 21, 2026 (91 FR 21301). Treat these as a floor rather than a forecast: a new, fully permitted detached ADU typically rents well above the metro benchmark, because the comparison pool includes much older and smaller stock from across the whole county.

Why the Bradbury market rewards the investment

Bradbury is the smallest kind of market and one of the strongest per lot. Fewer than 900 people live here, on parcels with a minimum of 7,500 square feet in the smallest zone and one, two or five acres in the three Agriculture Residential Estate zones, below the San Gabriel Mountains and the Angeles National Forest. Nearly every property has the physical room for a 1,000-square-foot detached unit without touching the house, which is unusual: in most of Los Angeles County the binding constraint on an ADU is land. Here it is fire clearance, utility runs and the private-easement setback — and all three are knowable before anyone digs.

The uses follow the market rather than the rent table. Multigenerational housing, staff accommodation, a guest unit that is legally a dwelling rather than a permanently kitchen-less guest house, a studio or office detached from the main house — these are the briefs that come up on an estate lot. All of them are better served by a permitted ADU than by the accessory-living-quarters route in Article III, which needs owner occupancy, non-tandem parking, full zone setbacks and a discretionary neighborhood compatibility hearing (§§ 9.85.300, 9.85.310). An ADU needs none of that. And § 9.85.160(g) lets a previously approved guest house be converted into an ADU, subject to Chapter 85 — which for many Bradbury properties is the cheapest square footage available anywhere on the lot.

When an ADU isn’t the right move

Four situations where the honest answer in Bradbury is wait, change the plan, or do something else.

The rules that make Bradbury different

This is the part of the page that does not exist anywhere else, so it is worth being precise about what is settled and what is not. Everything below is sourced to Bradbury Development Code Chapters 34, 43 and 85, the City’s own published planning materials, Gov. Code §§ 66314–66326, and HCD’s October 8, 2025 letter to the City.

The ridgeline hearing — and why it stops at your ADU

Chapter 43 is a serious constraint on building in Bradbury, and it is the reason the city looks the way it does. Where a proposed building, structure or improvement affects the view or vista of any pre-existing developed property — a view being anything from the Los Angeles basin and the city lights to a valley, a ravine, an equestrian trail or a pastoral setting, measured across a full 360 degrees from the main rooms of the neighboring house (§ 9.43.020) — the applicant must submit plans and elevations showing the building’s silhouette against the horizon, physically stake the property with poles to demonstrate the impact, and go to a noticed public hearing before the Planning Commission. The Commission may then impose any height limitation needed to keep the structure off the ridgeline or out of the neighbor’s view, subject only to a floor of 18 feet for the main building (§ 9.43.030).

That procedure runs “as part of the architectural review process” (§ 9.43.030(a)) — and Bradbury has exempted ADUs from architectural review outright. Section 9.34.020(c): “Accessory dwelling units and very high fire zone accessory dwelling units shall not require any architectural review, regardless of where such units are located.” The exemption is categorical. It has no geographic carve-out, no ridgeline exception and no size threshold, and the phrase “regardless of where such units are located” is doing deliberate work in a city where almost every parcel has a view of something.

There is one gap worth knowing about before you call City Hall. The City’s own published Planning Department page describes the development process in general terms: applications go to City Hall with three sets of plans and a filing fee, the City Planner prepares a staff report and recommendation for the Planning Commission, the process “usually takes about one month,” the Commission meets once a month, and “[m]inor reviews do not have to be reviewed by the Planning Commission.” It also notes that “[i]n some cases you may need to work with your HOA.” None of that page mentions the ADU exemption at § 9.34.020(c) or the 60-day ministerial clock at § 9.85.110(a). It is describing the process for a house, not for an ADU. If the first thing you are told is that your ADU goes to the Planning Commission, the two sections to have in front of you are § 9.34.020(c) and Gov. Code § 66317.

The same point applies to the homeowners associations. Bradbury has three — the Bradbury Estates Home Owners Association, the Bradbury Hills Road Association and the Woodlyn Lane Improvement Association — and their covenants are real and enforceable between you and them. What they cannot do is enter the City’s process. HCD said so to Bradbury directly, in the letter it sent the City on October 8, 2025: homeowners associations, “as a third party, cannot influence the approval of an application to create an ADU,” third-party review by an association or its agents would violate State ADU Law under Gov. Code § 66315, and no other local ordinance, policy or regulation may be applied in approving or denying an ADU permit (Gov. Code § 66317(c)). Civil Code §§ 714.3(a) and 4751(a) add the private-law half of the same answer: a covenant that effectively prohibits or unreasonably restricts an ADU on a single-family lot is void and unenforceable. Section 714.3(b) then goes one step further than § 4751 does, and the extra step is the useful one — reasonable restrictions “shall not include any fees or other financial requirements.” Start any association review early and run it in parallel — but it is not a lawful reason for the City’s clock not to have started.

Eighteen feet, granted citywide

This is the quiet advantage in Bradbury’s ordinance and it is worth stating plainly because so few cities do it. Gov. Code § 66321(b)(4) sets a 16-foot floor for a detached ADU and lifts it to 18 feet only within half a mile of a major transit stop or a high-quality transit corridor. Most Los Angeles County cities copy that structure exactly, which means a homeowner has to prove a transit test to get the taller envelope. Bradbury simply granted 18 feet to every lot with an existing or proposed dwelling, single-family or multifamily, at § 9.85.130(c)(1) — and repeated it for transit-proximate lots at (c)(2) and multistory multifamily lots at (c)(3), where the only difference is the extra two feet available for a roof-pitch match.

Two feet does not sound like much until you are drawing. It is the difference between a flat nine-foot ceiling and a vaulted one, between a 3:12 roof and a 5:12, and between an ADU that reads as a shed and one that reads as a house. On a foothill lot with the San Gabriels behind it, roof pitch is most of what makes a small building look right.

Accessory living quarters: the entitlement that is not an ADU

Article III of Chapter 85 keeps alive something almost no other California city still has, and confusing it with an ADU is the most expensive mistake available in Bradbury. In the three Agriculture Residential Estate zones a lot may carry a single-room-occupancy development plus a guest house, up to a combined 1,500 square feet in A-1, 2,000 in A-2 and 2,500 in A-5 — two to four SRO units in A-1, two to six in A-2 and two to ten in A-5 (§ 9.85.300(1)). That is in addition to whatever ADU and junior ADU the lot carries, and the allowed-development table at § 9.85.020 lists them side by side. The height allowance is more generous than any ADU’s: 28 feet, though still only one floor, which may be a second story above the house or garage (§ 9.85.300(5)–(6)).

The trade is everything else. Accessory living quarters must sit at least 20 feet from any other building and must meet the full setback, lot coverage, floor area, emergency evacuation capacity and building bulk standards of the zone (§ 9.85.300(4)) — none of the ADU relief applies. The owner must occupy either the primary unit or one of the quarters (7). One uncovered, non-tandem on-site parking space is required per unit, in addition to the house’s parking, all accessed from a single common driveway (8). Each SRO unit has to be between 150 and 300 square feet with a private toilet, a separate closet and an efficiency kitchen, no more than two people may live in one, and the development needs a shared laundry room with a wash tub and at least one washer and dryer (9). And the whole thing goes through neighborhood compatibility review under Chapter 34, where approval requires findings that the quarters suit the size and character of the lot and the neighborhood, will not overload parking, water, sewer, traffic, emergency evacuation capacity or utilities, and will not be materially detrimental to the use, enjoyment or valuation of neighboring property (§ 9.85.310).

Where Bradbury’s text falls behind the statute

Ordinance No. 398 is one of the cleaner chapters in the county and most of the usual preemption list does not apply here. Bradbury already bars ADU owner-occupancy outright, already codifies the eight-detached multifamily cap, already states the full set of parking exemptions, already protects the 800-square-foot unit and already states the impact-fee proportionality rule the right way round. Four things do sit behind the current law.

One discretionary hook inside a ministerial process

Section 9.85.130(g)(5) is worth flagging because it is the only place in Chapter 85 where a City officer is given judgement over an ADU application. Tandem parking and parking in setback areas “shall not be allowed if the City Manager makes specific findings that such parking is not feasible based upon specific site or regional topographical, or fire and life safety conditions.” The framing tracks Gov. Code § 66314(d)(10)(B), which permits exactly that determination — and (d)(10)(C) withholds it from the ADUs described in § 66322 — so the provision is not preempted on its face. But it is a findings power, it sits in an otherwise ministerial chapter, and in a hillside city in a fire hazard severity zone the predicate conditions are present almost everywhere. If your plan depends on tandem or setback parking, raise it with the City early rather than discovering the finding at the counter — and remember that the § 9.85.140 units need no parking at all, which makes the question moot for anything at 800 square feet or less.

Fire: the rule that sits above the chapter

Section 9.85.030 is the shortest section in Chapter 85 and the one most likely to shape a budget: notwithstanding any other provision to the contrary, all new construction must meet the requirements of the Los Angeles County Fire Department and comply with the California Building Code as adopted in Title XVII of the Bradbury Municipal Code. Bradbury sits directly below the Angeles National Forest, and the City publishes both a Very High Fire Hazard map and a set of fire zone construction standards; its own architectural-review exemption at § 9.34.020(c) names “very high fire zone accessory dwelling units” as a distinct category, which tells you how routine the designation is here.

None of that bars an ADU. State law preserves fire-safety standards as objective building requirements, and Bradbury applies them as such: ADUs are permitted in the fire hazard zone, and the only place in Chapter 85 where a very high fire hazard severity zone excludes development outright is § 9.85.420(2)(c), which governs SB 9 two-unit housing developments, not ADUs. Sprinklers follow the house: § 9.85.135 requires them in the ADU only if they were or are required in the primary unit, and building the ADU cannot trigger a requirement to retrofit sprinklers into the primary. That is Gov. Code § 66314(d)(12). What fire designation does mean is ignition-resistant assemblies, access and defensible-space work, and those belong in the budget at the start.