Building an ADU in Woodland Hills. Rules, costs, timeline.

Bigger than in most of the San Fernando Valley, and usually the full 1,200 square feet the City allows for a detached unit. Your lot carries a total floor-area cap alongside the ADU rules — 45 percent of lot area in R1 — but in Woodland Hills that cap rarely binds. We measured it parcel by parcel across 2,328 non-hillside R1 lots, matching each house to its own lot: the median has about 1,475 square feet of floor-area headroom left, and only 17 percent have under 800. Two-thirds of lots have room for a 1,200 square foot unit. That is a different picture from neighboring Studio City, where 39 percent of the 3,716 non-hillside R1 lots we measured the same way have under 800 square feet of headroom. The permit record agrees — the median new-construction ADU built in Woodland Hills is 914 square feet, against 662 in Studio City.

This is the most counterintuitive thing on the page, so read it before you design. RA covers more ground than any other single-family zone in Woodland Hills — 19 percent of all zoned land against R1's 15 percent — and it has the biggest lots, a median of about 17,900 square feet across the non-hillside RA parcels we measured. It is also the zone with the least ADU headroom. About 29 percent of the 1,853 non-hillside RA parcels we measured have under 800 square feet of floor-area room left, against 17 percent of non-hillside R1 parcels and 2 percent of RS. The reason is the ratio rather than the lot: RA is held to a much lower floor-area percentage than R1, and on a large lot people have generally built a large house against it. A quarter-acre lot is not a guarantee of anything. Get your remaining floor area calculated before you commission drawings, and know that the state 800 square foot protection sits underneath you regardless.

Less often than in Studio City. But for the owners it does reach, it is the whole project. LAMC § 12.22 A.33(c)(1)(iii) provides that no limit on lot coverage, floor area ratio, open space or minimum lot size may apply in a way that fails to permit at least an 800 square foot ADU, at least 16 feet in height, with four-foot side and rear setbacks — "to be constructed in compliance with all other local development standards." Read that closing clause: the size is protected against the floor-area cap, not against every other rule. Gov. Code § 66321(b)(3) says the same at state level. As amended effective January 1, 2026, it also adds front setbacks, and it bars any requirement for a separate zoning clearance that would prevent that unit. In Woodland Hills the protection is decisive for the 17 percent of non-hillside R1 lots under 800 square feet of headroom, for 29 percent of RA parcels, and for a third to a half of hillside lots. Note too that the floor is higher for an attached ADU: 850 square feet, or 1,000 with more than one bedroom.

It depends on your zone, and the gap between zones is worth real money. A detached ADU built under the City ordinance route gets two stories, plus your zone height limit. In R1 and RS that is 33 feet where the uppermost story has a roof slope of 25 percent or more, and 28 feet where it is shallower. In RA, RE11, RE15, RE20 and RE40 it is 36 feet and 30 feet, and those zones cover a plurality of Woodland Hills parcels. Almost all single-family land here is Height District 1. But about 2 percent is Height District 1XL, which is lower, so check your zone string rather than assuming. If you have read that Woodland Hills allows up to 45 feet, that is an apartment-zone figure and it does not apply to your lot. An attached ADU is guaranteed 25 feet, or your zone limit if that is lower. The separately protected state unit works the other way round. State law guarantees you at least 16 feet detached. It guarantees at least 18 feet within one-half of one mile walking distance of a major transit stop or high-quality transit corridor, plus two more feet to match your main house's roof pitch. Those are floors the City may not go below, not ceilings on your design.

No. That is worth stating flatly, because the fire map is the most common reason a Woodland Hills owner talks themselves out of a project. The restriction cannot be applied to a state ADU at all — Zoning Administrator Memorandum 143 says the prohibition at LAMC § 12.22 A.33(c)(4) "may not be enforced on State ADU types." A conversion ADU, a Junior ADU and the by-right detached 800 square foot unit are all state ADUs, so that route stays open wherever your lot sits on either map. What the fire rule can reach is the larger City ordinance ADU — the route to 1,200 square feet — and even then only where your lot is in both a Very High Fire Hazard Severity Zone and a designated Hillside Area. Both, not either. Woodland Hills is where that distinction pays off most: about 17 percent of the single-family-zoned land here is in the fire zone but outside the Hillside Area, so the rule never reaches it even on the ordinance route. The RE11 land is the clearest case — thousands of parcels, roughly a third in the fire zone, none in the Hillside Area. Of the 225 ADU permits pulled on fire-zone land here, more than half were on non-hillside lots. Check both designations for your parcel rather than assuming the fire map settles it.

Then the ordinance route engages the rule — but remember the state route does not, so a conversion ADU, a Junior ADU or the by-right detached 800 square foot unit is still available to you regardless. For the ordinance ADU, two exceptions follow. The first is unavailable to you as a matter of geography. It reaches only the Northeast Los Angeles and Silver Lake–Echo Park–Elysian Valley Community Plan Areas, and Woodland Hills is in the Canoga Park–Winnetka–Woodland Hills–West Hills plan area. That leaves the second exception: fire sprinklers, one off-street parking space, and frontage on a street improved to at least 20 feet of unobstructed width. It sounds heavier than it is, though the relief is conditional. Zoning Administrator Memorandum 143 states that this restriction may not be enforced against state ADU types at all — the whole of it, frontage included. For an ordinance ADU the memorandum strips out those conditions only where they conflict with state law. The sprinkler condition falls away where sprinklers were not required by code for your existing house. The parking condition falls away where a statutory parking exemption reaches your lot. If neither applies, they survive. The frontage requirement is satisfied by dedication rather than by physically widening the street. If sprinklers or parking are demanded of you on fire-zone grounds, ask in writing which provision authorizes it.

Less than the flats, and this is where Woodland Hills has its squeeze. Hillside floor area runs on slope bands rather than a flat percentage, so the answer depends on how steep your lot is. Across 3,113 hillside R1 parcels, even at the most generous slope band the median has about 1,267 square feet of headroom and 35 percent are under 800 square feet. A band down, the median falls to around 907 and 47 percent are under 800. So roughly a third to a half of hillside owners are in the position where the state 800 square foot protection is not a safety net but the actual rule. Hillside lots also carry a Slope Analysis Map, stamped by a registered civil engineer or licensed land surveyor, as a submittal item — budget for it as a survey cost at the start rather than a correction later.

Not if you have a house. The Warner Center 2035 Specific Plan covers a substantial part of Woodland Hills. But it contains no single-family-zoned land anywhere in its footprint. It is a commercial and mixed-use plan, and its own text describes providing a transition to the single-family pattern west of it. So if you own a single-family home in Woodland Hills, it does not apply to you. It does apply if you are adding units to an apartment property inside the plan area. There an Administrative Clearance is required, and the plan sets a 300 square foot minimum dwelling unit that sits awkwardly against state law allowing an efficiency-unit ADU below that. Only five of the 809 ADU permits pulled in Woodland Hills since 2020 fall in this category, all at two adjacent Canoga Avenue apartment addresses.

It might, and the City's own documents do not obviously agree with each other — which is worth knowing before you are surprised at the counter. The Girard Tract Specific Plan covers about 7 percent of Woodland Hills single-family land, most of it R1. Zoning Information File ZI-1383 instructs staff to "issue no building permit until a clearance from the City Planning Department, Community Planning Valley Bureau is obtained." But the Specific Plan itself, at section 6.C, exempts "any building or structure which is accessory to an existing single-family dwelling" — which is a fair description of an ADU. Then the very next item, section 6.E, caps "the total cumulative floor area of all such additions" at 500 square feet on lots over 5,000 square feet, which if it applies would put a typical Woodland Hills ADU outside the exemption entirely. Twenty-four ADU permits have been issued inside the Girard Tract, so something workable is happening in practice. We are not going to tell you which document wins. If your parcel is in the Girard Tract, ask City Planning in writing whether a clearance will be required for your ADU before you build a schedule around the answer.

The City ordinance says one ADU. State law requires more, and the State told Los Angeles so directly in a findings letter in November 2024. Gov. Code § 66323(a) requires the City to allow a conversion ADU, a Junior ADU and a newly built detached ADU in combination rather than as alternatives. HCD's March 2026 Handbook adds, at page 18, that a local agency must allow at least one further unit under Gov. Code § 66314 on top of that stack. That would make four. Treat the fourth as an argument to raise in writing at pre-application rather than something to assume at the counter. Unlike Studio City, floor area is usually not what limits you here — on a median non-hillside R1 lot there is room for more than one unit.

Usually not, and on several routes never. No parking of any kind may be required for a Gov. Code § 66323 unit — a conversion ADU, a Junior ADU or the by-right detached unit. A Junior ADU may never be required to provide parking on any route. For everything else, at most one space per ADU is required, and six statutory exemptions remove it. Five of them stand on their own: within a half-mile walking distance of public transit; within one block of a car share vehicle; where the ADU is part of the existing primary residence or an accessory structure; where on-street parking permits are required but not offered to the ADU's occupant; and inside an architecturally and historically significant historic district. That last one is not available to you, because Woodland Hills has none. The sixth exemption applies where the ADU is permitted alongside a new primary dwelling, but only if the lot also meets one of the five above, so it does not stand on its own. Guest parking may never be required for an ADU at all. One local caution: Woodland Hills is less transit-served than the neighborhoods east of it, so the half-mile exemption reaches fewer lots here. Check yours rather than assuming.

LADBS plan check and permit fees are valuation-based, so we would rather quote you against real drawings than guess from a table. What is worth knowing is that Woodland Hills carries fewer extra planning steps than its neighbors. The River Improvement Overlay that sat under 87 percent of Studio City's ADU permits reaches essentially none of Woodland Hills. Two things can add a City Planning step. One is the Girard Tract clearance question above. The other is the Mulholland Scenic Parkway Specific Plan, where City Planning's own handout describes a 6 to 12 month review and roughly $9,700 in fees above 900 cumulative square feet. On the protective side, an ADU of 750 square feet or less pays no development impact fees at all under Gov. Code § 66311.5(c)(1), and school fees are exempt below 500 square feet of interior livable space. Because the median new ADU here is 914 square feet, more Woodland Hills projects land above the impact-fee line than in Studio City — worth modeling before you settle on a size.

The statutory clock is 60 days from a complete application. Review is ministerial — a checklist, not a judgment call, with no public hearing, no discretionary design approval and no neighbor sign-off. Two things about that clock are worth knowing. It binds the permitting agency as a whole rather than LADBS alone, so a City Planning clearance sits inside the 60 days rather than in front of them. And if the City misses the deadline without acting, the application is deemed approved. Woodland Hills generally moves faster than the neighborhoods east of it because fewer overlays touch a given parcel — but if your lot is in the Girard Tract or the Mulholland Specific Plan, resolve that question in writing at the start rather than discovering it in plan check.

New construction, more often than in most of Los Angeles — because here you generally have the floor area to spend. A conversion is still the better move if you have a sound detached structure worth reusing. It carries no square-foot cap under state law: it is bounded by the existing structure's own dimensions, plus up to 150 square feet for ingress and egress. And it usually adds little to your floor-area total. One trap to check first. If the garage you are converting counted as required covered parking, it may have been exempt from Residential Floor Area — the total floor space the City counts on your lot — up to 400 square feet. Converting it can cost you that exemption. But the median non-hillside R1 lot here has 1,475 square feet of headroom left, so most Woodland Hills owners can build the unit they actually want rather than the unit their floor area allows.

Well relative to what the property costs, which is the quiet financial case for building here — though Woodland Hills splits into two ZIP codes that behave differently, so we report them separately rather than blending them. In 91364, the southern half, Zillow's observed rent index runs about $3,774 a month against a home value index near $1.31 million — a better ratio than Studio City's $3,448 on $1.70 million. In 91367, the northern flats, rent runs about $2,965 on $1.12 million, so the rent is lower than Studio City's but so is the entry price. Other markets we work in run stronger ratios still. We are not going to publish a bedroom-level asking rent, because the sources we trust are either blended across all unit sizes or are voucher standards rather than market rents, and quoting either as an asking rent would be misleading. Start from HUD's Small Area Fair Market Rents for your own ZIP code — 91364 or 91367 — rather than the metro-wide schedule, since both Woodland Hills ZIPs sit above Studio City's at every bedroom count. Check the current-year file, because HUD revises it mid-year. Then check live listings for comparable units in your part of the neighborhood. Note also that a Woodland Hills ADU is a long-term rental: state law requires the City to condition a Gov. Code § 66323 unit on rentals longer than 30 days.