Fast, Reliable New Detached ADU Across West Hollywood
A New Detached ADU in West Hollywood typically costs between $285,000 and $420,000 all-in, from drawings through final inspection. That figure assumes a one-bedroom unit of roughly 500 to 750 square feet on a standard WeHo parcel. The city’s own permit process, its Rent Stabilization Ordinance, and the age of most garages here all push that number in predictable directions, which is exactly what we’ll walk you through on this page.
Ellery ADU Studio has designed, permitted, and built over 900 ADUs since 2015. We know the streets west of La Brea, the bungalow courts near Plummer Park, and the tightening setback rules along the hillside blocks north of Santa Monica Boulevard. Call (971) 497-2402 and you’ll get a written scope, a documented photo record on every visit, and one contract for the whole job: design, permitting, and construction.
Why Ellery ADU Studio Is West Hollywood’s Preferred New Detached ADU Company
West Hollywood is not Los Angeles, and that distinction matters more here than anywhere else in the county. The city is 1.9 square miles with its own Building & Safety department, its own inspectors, and its own ADU ordinance. A permit that clears LADBS in six weeks can sit in WeHo review for three months if the application doesn’t address the parcel’s rent-stabilization status or a historic bungalow court designation. We file for West Hollywood projects knowing what this city’s plan checkers ask for before they ask it.
Nadia Ellery founded this studio the year California’s ADU permitting landscape shifted, and she built the practice around a single contract that covers the drawings, the permit set, and the construction. There’s no designer pointing at a builder and no builder blaming a designer. That model matters on tight WeHo lots where a detached unit has to clear setback variances, historic review, and a separate Building & Safety sign-off all at once. Under The Haven Standard, every project gets a written price before any work begins, a documented photo record on every visit, and a 365-Day Done Right Promise: if the finished ADU is not built to the permitted drawings, we make it right.
Our crews serve West Hollywood directly. We coordinate scheduling from our Los Angeles office, but the project managers, plan checkers, and framing crews working your parcel know the difference between a 1923 bungalow court off Harper Avenue and a 1950s courtyard building near Santa Monica and Fairfax. That local familiarity is why WeHo homeowners keep our number in their permit paperwork.
Our New Detached ADU Services in West Hollywood
Custom Built ADU
A custom detached ADU in West Hollywood starts with a site survey and a feasibility review that accounts for your parcel’s zoning, any historic overlay, and the condition of whatever structure already sits at the back of the lot. We’ve built custom one-bedroom units of 450 square feet behind Spanish duplexes and two-story units of 1,000 square feet where the lot could take it. Every custom build ends with a permit set the city signs off on, a photo record of every phase, and a written warranty tied to the drawings.
On a 40-foot-wide lot south of Melrose, we framed a freestanding ADU six inches off a neighbor’s garage wall and still cleared fire separation because the plans came to plan check pre-loaded with the right assemblies. That’s the kind of sequencing you need in a city where inspectors see dozens of sloppy ADU sets every month.
Studio ADU
A studio ADU in West Hollywood usually lands between 400 and 600 square feet and runs $240,000 to $340,000 depending on site work, utility depth, and whether the soil under the slab needs compaction or a retaining wall. Studios are the most common detached ADU type in WeHo because the lots are so narrow that anything larger won’t clear the rear-yard setback without a variance. We file for those variances routinely. Our success rate on studio ADU permits through WeHo Building & Safety is high because we submit sets that anticipate the city’s fire-access and ventilation comments rather than waiting for a redline round.
1-Bed & 2-Bed ADU
A one-bedroom detached ADU in West Hollywood typically runs $285,000 to $380,000, and a two-bedroom runs $350,000 to $420,000. The bigger units almost always require a panel upgrade from the original 60- or 100-amp service, and many WeHo parcels need trenching through compacted fill or old clay pipe to reach the sewer lateral. We write those allowances into the scope at signing, with no change order you haven’t approved in writing first. Haven Standard Clause 5 locks the scope; nothing gets added without your signature.
Two-bedroom detached units on RSO parcels pull extra tenant-notice and filing requirements through WeHo’s separate Housing Division. We handle that paperwork as part of the permit set rather than treating it as an afterthought.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in West Hollywood
We specify and coordinate prefab and modular systems from Abodu, Cover, and Dvele for West Hollywood clients who want factory-built precision with a faster on-site schedule. Abodu’s turnkey one-bedroom units fit well on flat lots where the crane can stage from the street or the alley, and we routinely cite them for parcels near West Hollywood Park where tree canopy limits a stick-built footprint. Cover and Dvele panels work on hillside blocks near the base of the Hollywood Hills where custom framing would drag through multiple structural reviews. When your detached ADU uses a prefab shell, we still run the entire permit set, the foundation, the utility connections, and the finish work through our single contract. The panel warranty and our 365-Day Done Right Promise both stay in writing.
Common New Detached ADU Problems We See in West Hollywood Homes
- Rotted sill plates on pre-war garages. The 1920s and 1930s garages behind most WeHo homes sit on slabs without capillary breaks. Water wicks up through the concrete into the bottom plate, and once you strip the stucco or shiplap, the framing is wet and punky. We’ve had to re-frame interior walls more times than we can count. That’s why our contract carries a framing allowance line item so the discovery doesn’t stall the job.
- Cast-iron drains rusted through at the cleanout. A 1940 garage off Sherbourne Drive near Plummer Park taught us what we now expect: the drain line under the slab was gone at the hub. We replaced it with ABS before any finish work went in. On WeHo lots, sewer laterals often run under the garage itself, which means a plumbing discovery can affect the slab and the structural drawings at once.
- Undersized panels that fail load calc. Most pre-1980 garages in West Hollywood still hang a 60-amp subpanel or a retired 100-amp main. Add a kitchen, a bath, and a heat pump, and the load calc exceeds 80% of existing service. WeHo’s Building & Safety will reject the mechanical and electrical drawings at that point. We run the load calc during feasibility, not after demo, and quote the panel upgrade as a line item before you sign.
- Waterproofing failures on the western hillside blocks. The coastal fog that settles against the Hollywood Hills from Fairfax west means the north walls of detached ADUs there carry real moisture load. A vapor barrier is not optional on those parcels. We specify prescriptive barriers and drainage planes as standard on any ADU built below the crest of the hillside.
Pricing for New Detached ADU in West Hollywood, CA
Here are the honest ranges we quote most often in West Hollywood, drawn from our own completed projects and current material and labor pricing in this city:
Studio ADU: $240,000-$340,000
1-Bedroom ADU: $285,000-$380,000
2-Bedroom ADU: $350,000-$420,000
Those figures cover design, permit set, WeHo Building & Safety fees, construction, and final inspection for a standard one-story detached unit. What moves the number on a West Hollywood parcel is usually four things: whether you’re in a historic bungalow court that triggers a Certificate of Appropriateness review, whether the existing panel can carry the new load or needs replacement, how deep your sewer lateral sits under the garage, and whether the rear-yard setback forces a variance. We quote every one of those as a specific line item before you sign. Never a range you can’t hold us to.
Call (971) 497-2402 for a written estimate. If you already have a bid from another builder, bring it in for a Free Second Opinion. We’ll go through it line by line and tell you what’s real, what’s padded, and what WeHo review will flag.
We Also Serve Cities Near West Hollywood
Ellery ADU Studio serves West Hollywood and the surrounding corridor, including New Detached ADU in West Hollywood and nearby Beverly Hills, Universal City, Studio City, and North Hollywood. If your property sits just outside city limits but you still want the same written-price, single-contract model, we cover those parcels too. The permit pathway changes by city, but the way we write your contract and document the build does not.
Serving West Hollywood, CA - Our Local Coverage Area
We’re based in the West Hollywood area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - New Detached ADU in West Hollywood
Yes, if the bungalow court or the garage behind it is designated as a contributing structure under West Hollywood’s Historic Preservation Program. The Certificate of Appropriateness review happens before Building & Safety will accept your ADU submittal. It typically adds 6 to 10 weeks to the timeline. We handle the application, the drawings, and the hearing if one is required. Call (971) 497-2402 and we’ll check your parcel’s designation during the first phone call.
West Hollywood’s RSO covers most pre-1979 multi-family buildings, and a new detached ADU on that parcel must be evaluated for how it interacts with existing tenancy rights. You may need tenant notices, filing with the Housing Division, and a phasing plan that keeps existing units habitable during site work. This requirement does not apply across the border in Los Angeles, and it’s the single most common reason a WeHo ADU permit gets stuck. We file the RSO paperwork as part of your permit set rather than treating it as a separate problem. That’s a dual-compliance burden most ADU builders in LA never touch, and it’s built into our West Hollywood process from feasibility through certificate of occupancy.
Not always, but more often than you’d think. A studio with a kitchenette and a mini-split heat pump can squeeze under the 80% load threshold on a 100-amp panel if everything else on the service is modest. But most WeHo garages are tired 60-amp subpanels from the 1950s, and those never clear the load calc once a bathroom fan, water heater, and AFCI-protected circuits enter the drawings. We run the load calc in feasibility and quote the panel work as a line item, so you know before you sign whether it’s needed. Don’t guess on this one. Call (971) 497-2402 and we’ll tell you exactly where your service stands.
Because the western blocks of West Hollywood, the ones climbing toward the base of the Hollywood Hills, sit in a marine fog zone that the flat eastern blocks near La Brea don’t. The north-facing walls of a detached ADU in that zone carry measurable moisture for hours every morning, and a poorly detailed barrier lets that moisture migrate into the framing and insulation. We specify a prescriptive vapor barrier and drainage plane on every ADU built west of Fairfax, and we document the installation in your photo record before insulation goes in. That single detail prevents the rot we keep finding in garages that were framed without it seventy years ago.
Yes. During a Regional Fire-Weather Watch, WeHo Building & Safety can suspend active construction inspections with almost no notice, especially on sites close to the hillside or with open trenches and exposed framing. We track those closures and reschedule inspections the same day they reopen, and our contract carries a weather-delay allowance so the schedule can flex without triggering a change-order fight. If you’re in the middle of a build and a Santa Ana event hits, the sequence of work matters: we schedule excavation and stucco phases around the high-wind season where we can. The schedule is part of the written scope, not a surprise.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving West Hollywood since 2015.