ADU Constructionin West Hollywood, CA
ADU construction in West Hollywood runs on Municipal Code 19.36.310, which approves ADUs without a hearing through one of two paths: a building permit alone for the simplest types, or an ADU permit plus a building permit. A complete application must be approved or denied within 60 days. We could not confirm the January 2026 ordinance text, so ask Planning.
West Hollywood is a 1.89 square mile city where 80.2 percent of occupied homes are rented and 81 percent of homes are in buildings of five or more units. Single-family houses number 2,428 of 26,079 homes, so an ADU here is as likely to be a garage or storage room converted inside an apartment building as a cottage in a backyard. About 80 percent of the city's homes were built before 1980, and the city's 1920s Spanish Revival and Art Deco apartment buildings still shape what a lot can hold.
This page covers which permit path fits, the multifamily route, size and height limits, the hillside and fault checks in the northern neighborhoods, and fees. The City's pages and eCode360 refused our tools, so the code text comes from the GoCodebook mirror of the City's code. We saw only Council agenda pages for the 2026 ordinances that amend the ADU rules, never the adopted text, and we say where that matters. Price ranges and phases are on our ADU construction page.
West Hollywood Planning and Building rules that apply to ADU construction
Where adu construction permits come from in West Hollywood: City of West Hollywood Community Development Department, Building & Safety Division.
- Municipal Code 19.36.310 (ADUs and JADUs) allows two permit paths. A building permit alone is enough for a converted ADU or JADU on a single-family lot (one of each), one new detached ADU of 800 square feet or less with at least 4 foot side and rear setbacks, converted ADUs in multifamily buildings (at least one, up to 25 percent of existing units), and detached ADUs on multifamily lots (up to two on a proposed multifamily lot, up to eight on an existing one, not more than the number of existing units). Anything else needs an ADU permit (Chapter 19.43) plus a building permit.
- Approval is ministerial with no hearing (19.36.310(D)): the City must say within 15 business days whether an application is complete, must approve or deny a complete application within 60 days or it is deemed approved, and must act within 30 days on a detached ADU that uses a City-preapproved plan. Denials must list every defect, and an appeal of a denial goes to the Planning Commission, which must decide within 60 business days.
- ADU-permit ADUs are capped at 850 square feet (studio or one bedroom) or 1,200 square feet (two or more bedrooms), attached ADUs at 50 percent of the existing dwelling, and no other standard may reduce an ADU below 800 square feet (19.36.310(F)(1)). Setbacks are 4 feet side and rear, with front setbacks of 10 feet in R-1 and R-2, 15 feet in R-3 and 7.5 feet in R-4, none if built where an existing structure stands; detached ADUs need 6 feet from other residential buildings; in R1-A, R1-B and R1-C an ADU may not push FAR above 0.5.
- Height limits (19.36.310(E)(2)): a detached ADU may be 18 feet, plus up to 2 feet (20 feet total) to match the primary roof pitch; an attached ADU may be the lower of 25 feet or the zone's limit and no more than two stories. Rooftop decks on ADUs are prohibited except in R-3 and R-4 through a development permit.
- No off-street parking is required for an ADU and spaces removed for one need not be replaced (19.36.310(F)(4)). No ADU window or door may look directly into a window or door of an adjoining residence unless screened by fencing, landscaping or privacy glass, and exterior lighting is limited to downlights unless codes require more (19.36.310(F)(8)).
- Impact fees under Chapter 19.64 do not apply to ADUs or JADUs, and ADUs under 500 square feet of livable space are exempt from school fees (19.36.310(G)(1)). Converted ADUs and JADUs on single-family lots do not need a new utility connection or connection fee; other ADUs need a separate connection with fees proportional to size or drainage fixture units.
- ADUs are not subject to an owner-occupancy requirement; a JADU (up to 500 square feet inside a single-family structure) requires the owner to live in either unit unless it has separate sanitation, and a deed restriction must be recorded before the certificate of occupancy (19.36.310(E)(8) and (E)(9)). An ADU may be rented but not sold separately except as state law allows, with a one-year minimum rental term (19.36.275).
- ADU approval is ministerial, so the historic preservation chapter (19.58) does not apply, but an ADU on a California Register property must not be visible from the public right-of-way (19.36.310(F)(5)). Fire sprinklers are required in an ADU only if the primary dwelling has them, and no ADU certificate of occupancy may issue before the primary dwelling's.
Sources for these rules
Can you build an ADU on a West Hollywood apartment lot or inside an apartment building?
Yes, and this is the route that fits most of the city. Municipal Code 19.36.310, as shown on the mirror, lets a building permit alone cover converted ADUs inside a multifamily building, with at least one allowed and up to 25 percent of the existing units. It also lets detached ADUs go on a multifamily lot: up to two on a proposed multifamily lot and up to eight on an existing one, though never more than the number of existing units.
In practice, the first question is what space you have. State law's examples of convertible multifamily space are storage rooms, garages and attics, and in buildings of 10 to 19 units, where 6,132 homes here sit, a basement or parking level may qualify too. The second question is the building's age: nearly 24 percent of the city's homes predate 1950, so records, wiring and sewer lines need a close look before anyone promises a layout.
Conversions in existing single-family homes get the same treatment. One converted ADU and one JADU per single-family lot go through the building permit alone.
Which permit does an ADU need in West Hollywood, and how long does review take?
There are two paths. A building permit alone is enough for a converted ADU or JADU on a single-family lot, one new detached ADU of 800 square feet or less with at least 4 foot side and rear setbacks, and the multifamily types above. Everything else needs an ADU permit under Chapter 19.43, a ministerial permit approved by the Community Development Director, plus a building permit.
Approval has no hearing. Under 19.36.310(D), the City has 15 business days to say whether an application is complete, then 60 days to approve or deny it, or the application is deemed approved. A detached ADU on a City-preapproved plan gets 30 days. A denial must list every defect, and an appeal goes to the Planning Commission, which must decide within 60 business days. A Council agenda for January 20, 2026 listed Ordinance No. 25-31, which amends 19.36.310 and adds Chapter 19.43, for second reading. The page did not show the vote or effective date, so ask Planning which text is in force.
Start at the Building & Safety page and the ADU chapter on the Municipal Code mirror.
How big can an ADU be in West Hollywood, and how tall?
Under the mirror's 19.36.310(F)(1), ADUs approved through the ADU permit are capped at 850 square feet for a studio or one bedroom and 1,200 square feet for two or more bedrooms. An attached ADU may not exceed 50 percent of the existing dwelling, and no other standard may reduce an ADU below 800 square feet. Side and rear setbacks are 4 feet. Front setbacks are 10 feet in R-1 and R-2, 15 feet in R-3 and 7.5 feet in R-4, and none where an existing structure stands.
A detached ADU may be 18 feet high, plus up to 2 feet to match the main roof pitch, and an attached one may rise to the lower of 25 feet or the zone's limit, in no more than two stories. A detached unit must sit 6 feet from other residential buildings. In the R1-A, R1-B and R1-C zones, an ADU may not push the floor area ratio above 0.5.
Two design rules matter on tight lots: no ADU window or door may look straight into an adjoining residence's window or door unless screened, and rooftop decks on ADUs are barred except in R-3 and R-4 through a development permit.
Building an ADU near the Sunset Strip or in the Norma Triangle: fire zone, fault zone and historic limits
The northern strip of the city carries the extra checks. The Los Angeles County Fire Department's copy of the state fire map, revised August 21, 2025, put 18 of 121 sample points inside the city in Very High, 9 in High and 9 in Moderate, all between about latitude 34.088 and 34.096. That is a point sample, not a parcel lookup. The City's fire map page is the place to check an address, and a September 15, 2025 Council item introduced an ordinance to adopt CAL FIRE's March 2025 map, whose adoption we did not confirm.
A significant part of the Norma Triangle lies in the Hollywood Earthquake Fault Zone, per the neighborhood's Wikipedia article, and Municipal Code 13.04.070 lets the Building Official require a geologist's investigation. A new ADU is new construction, so expect that question on an affected lot.
Historic review does not slow an ADU, since approval is ministerial and Chapter 19.58 does not apply. One limit does follow historic status: an ADU on a California Register property may not be visible from the public right-of-way.
ADU fees, parking and utility connections in West Hollywood
The mirror says impact fees under Chapter 19.64 do not apply to ADUs or JADUs, and that ADUs under 500 square feet of livable space are exempt from school fees. A converted ADU or JADU on a single-family lot needs no new utility connection or connection fee. Other ADUs need their own connection, with fees tied to size or drainage fixture units. We could not read the City's fee schedule, so permit and plan check fees are lines to request in writing.
Parking is simple here. No off-street parking is required for an ADU, and spaces lost to the ADU need not be replaced. Exterior lighting is limited to downlights unless codes require more.
Fire sprinklers are required in an ADU only if the main dwelling has them, and no ADU may receive its certificate of occupancy before the main dwelling does. The debris control plan the Code requires before permitted construction starts should be expected on an ADU too, which matters when a sewer or utility trench is part of the scope.
Can you rent an ADU in West Hollywood, and who has to live there?
ADUs carry no owner-occupancy requirement on the mirror. A JADU of up to 500 square feet inside a single-family structure does, with the owner living in either unit unless it has separate sanitation, and a deed restriction must be recorded before the certificate of occupancy. An ADU may be rented but not sold separately except as state law allows.
The mirror's Section 19.36.275 sets a one-year minimum rental term, while state law only lets a city require terms of 30 days or longer. We did not confirm how the two fit together, so ask Planning before you plan on shorter rentals. Our guide to ADUs versus JADUs compares size, kitchens and rules.
Garage conversions follow the same path as other ADUs, and our post on garage conversion permit steps shows the order of work in Los Angeles, whose bulletin is not West Hollywood's.
From site visit to certificate of occupancy: how an ADU job runs in West Hollywood
The first step is a site visit and a survey, then a choice of path from the two above. After approval, construction hours under Municipal Code 9.08.050 run weekdays from 8 a.m. to 7 p.m., with Saturdays limited to interior work and no work on Sundays or listed holidays. Gas or combustion-powered leaf blowers are banned at all times.
Permits move on their own clocks. A permit application expires if no permit issues within 18 months, with up to two 180 day extensions, and work that breaks the Building Code is a misdemeanor, each day a separate offense. That is poor footing for a unit you intend to rent.
As MDG Builders, CSLB #1040337, we draw the unit, run the permits and manage the schedule, while licensed foundation, framing, plumbing and electrical firms do the field work. Ask each for its license number and certificate of insurance.
ADU photos from West Hollywood and nearby homes
ADU scenes tied to West Hollywood and the communities around it, from garage conversions and slabs to finished studios. Tap a photo to enlarge it.
What adu construction costs around West Hollywood
Our ADU construction page shows roughly $100,000 to $200,000 for turning a garage into a studio or one-bedroom unit, and roughly $200,000 to $400,000 for a new detached unit of 400 to 800 square feet. Those ranges come from three independent reads: a UC Berkeley survey of Los Angeles County projects from 2018 and 2019, with a median of $100,000, garage ADUs at $90,000 and detached units at $180,000; the Terner Center's 2020 estimate of $148,000 for Los Angeles; and Remodeling magazine's 2025 Cost vs. Value job cost of $178,536, which recouped 39.9 percent at resale. None is a West Hollywood quote, and we could not read the City's fee schedule, so fees appear as their own lines in a written proposal. The ADU cost guide covers the details, and the license check guide shows how to verify a contractor. Nearby cities apply the same state law in their own ways, so compare ADU construction in Los Angeles, Culver City, Santa Monica and Glendale. A bathroom inside the unit is on our West Hollywood bathroom page, an attached addition on the West Hollywood room addition page, and the West Hollywood area page lists every trade we cover in the city.
| What it covers | Typical range |
|---|---|
| Garage conversion to a studio or one bedroom | $100,000 to $200,000 |
| New detached ADU, 400 to 800 sq ft | $200,000 to $400,000 |
| UC Berkeley survey, Los Angeles County median, 2018 and 2019 projects | $100,000 overall. $90,000 garage. $180,000 detached. |
| Terner Center and Berkeley CCI, 2020 | $148,000 Los Angeles estimate. $167,000 statewide average. |
| Remodeling Cost vs. Value 2025, Los Angeles | $178,536 job cost |
| Electrical and plumbing, Angi Los Angeles, January 2026 | Electrical $2,600 to $7,800. plumbing $3,900 to $10,400. |
| City permit and plan check fees | Not priced here |
Other work we manage in West Hollywood
West Hollywood ADU questions, answered
Can I build an ADU in West Hollywood?
Yes. Municipal Code 19.36.310 approves ADUs without a hearing, through a building permit alone for the simplest types or an ADU permit plus a building permit for the rest. The City must approve or deny a complete application within 60 days. Confirm which ordinance text is in force with Planning, because the 2026 amendments were only seen as agenda items.
How big can an ADU be in West Hollywood?
For an ADU-permit ADU, 850 square feet for a studio or one bedroom and 1,200 square feet for two or more bedrooms, with attached units capped at 50 percent of the existing dwelling. No standard may cut an ADU below 800 square feet. These numbers come from a mirror of the code, so confirm them with Planning.
How much does it cost to build an ADU in California?
Roughly $100,000 to $200,000 turns a garage into a studio or one-bedroom ADU, and a new detached unit of 400 to 800 square feet runs roughly $200,000 to $400,000. The sources are 2018 to 2020 surveys and a 2025 Los Angeles job cost, none from West Hollywood, so a written proposal after a site visit sets the figure.
Do I need to provide parking for my ADU?
No. The mirror says no off-street parking is required for an ADU, and spaces removed to build one need not be replaced. That makes garage conversions simpler here than in many cities. Parking rules for the main building still apply, and the City's own page was unreadable to us, so confirm with Planning.
What is the difference between an ADU and a JADU?
An ADU is a full, independent unit with its own sleeping, cooking and bathroom, attached or detached, while a junior ADU is a unit of up to 500 square feet carved out of a single-family house. West Hollywood allows one of each on a single-family lot through a building permit alone. Our ADU versus JADU guide compares them.
Can I rent out my ADU or sell it separately?
You can rent it, and no owner-occupancy rule applies to an ADU. The mirror shows a one-year minimum rental term, which we could not reconcile with state law's 30 day floor, so ask Planning. An ADU generally cannot be sold separately except as state law allows. Short-term rentals follow rules we did not research.
How long does it take to get an ADU permit?
The City must say within 15 business days whether an application is complete and act within 60 days after that, or it is deemed approved. A detached ADU on a City-preapproved plan gets a 30 day decision. Building permit plan check and construction follow. We found no published figure for how long approval takes in practice.
Do I need a permit to convert my garage into an ADU?
Yes. A converted ADU on a single-family lot needs a building permit, though it skips the separate ADU permit. Plumbing, electrical and mechanical work are inspected, and a deed restriction is needed for a JADU. Work without a permit is a misdemeanor, each day counted separately, with fines up to $1,000 on the mirror.
Tell us about your West Hollywood ADU plans
Tell us which neighborhood you are in, whether the lot is a house or an apartment building, and whether you have a garage or storage space in mind, and we will plan the first visit around the permit path.