Fast, Reliable New Detached ADU Across West Hollywood
A new detached ADU in West Hollywood typically runs $280,000-$520,000 all-in, from permit set through final inspection, with most projects completing in 8-14 months depending on hillside conditions and RSO review requirements. We coordinate scheduling from our Los Angeles office and serve West Hollywood directly, with crews who know the difference between WeHo’s Building & Safety division and LADBS - because getting that wrong costs months.
We’ve designed, permitted, and built over 900 ADUs since 2015, the year California’s ADU laws shifted. Every one carried a written price before work started, per Haven Standard Clause 1. Call (747) 322-4648 to schedule your free estimate.
Why Ellery ADU Studio Burbank Is West Hollywood’s Preferred New Detached ADU Company
West Hollywood is an independent incorporated city with its own building department, its own Rent Stabilization Ordinance, and its own Public Works alley standards. Contractors who work LA County every day walk into WeHo’s permit counter assuming LADBS rules apply. They don’t. Our New Detached ADU team has pulled permits through WeHo’s Building & Safety division enough times to know the staff by name, the correction notices they issue, and the RSO review letters they require before they’ll release a permit on any multi-unit lot.
Our West Hollywood clients receive the same documentation we provide everywhere: a written price before any work starts, a documented photo record on every site visit, and the 365-Day Done Right Promise backed in writing. We’re not guessing at your alley setback or your RSO status. We verify both before we quote.
Dispatch and scheduling are coordinated from our Los Angeles office. Crews serve West Hollywood locally. Response time to West Hollywood inquiries is same-day during business hours, and a live person answers calls 24/7 - no voicemail queue, no callback promise that doesn’t materialize.
Our New Detached ADU Services in West Hollywood
Custom Built ADU
A custom built ADU in West Hollywood gives you full control over layout, materials, and massing to match the Spanish Colonial or Mediterranean character that dominates the city’s 1920s-1950s housing stock. We design the permit set in-house, build from that same set, and hold one contract for both - no designer-builder blame gap when the inspector asks why the window doesn’t match the drawing. On narrow 30-foot lots near Sweetzer Avenue or Hammond Street, we’ll often design vertical to preserve the rear yard while hitting the floor-area ratio WeHo allows. Custom builds in West Hollywood typically run $320,000-$520,000 all-in.
Prefab ADU Installation
Prefab ADU installation in West Hollywood works best on flat lots with alley access wide enough for a crane set. We specify and coordinate Abodu and Cover systems within our single contract, handling the site prep, foundation, utility tie-ins, and WeHo inspections ourselves - not handing you off to a third-party installer after delivery. The mild Mediterranean climate means no weather delays during set, and minimal mechanical systems after: a single-zone mini-split almost always suffices. Prefab installs in West Hollywood typically run $280,000-$420,000 all-in, depending on foundation requirements and whether we need to upgrade the alley approach for delivery access.
Modular ADU
Modular ADU construction in West Hollywood uses factory-built volumetric units from brands like Dvele, delivered in sections and assembled on site. The advantage is speed of enclosure - critical on hillside parcels near Doheny Drive where weather windows for exposed framing are tighter than the flat central blocks. We coordinate the modular spec, the transport routing (avoiding low-clearance alleys where needed), and the WeHo inspection sequence, which differs from LADBS modular protocols. Modular ADUs in West Hollywood typically run $300,000-$480,000 all-in.
Studio ADU
A studio ADU in West Hollywood is the most common detached unit we permit on the city’s narrow lots - 300-450 square feet, no separate bedroom, designed to the minimum setbacks WeHo’s alley grid allows. On 25-foot-wide lots near Fairfax or La Brea, we’ll often design a studio to slip between the required side-yard clearances while preserving the rear yard the city requires for light and air. Studio ADUs in West Hollywood typically run $280,000-$380,000 all-in. We also design and build 1-bed and 2-bed ADUs where lot coverage allows, typically adding $40,000-$80,000 per additional bedroom for framing, MEP, and finish.
What happens when you call
- 1
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.
Before
AfterTrusted Brands We Service in West Hollywood
We specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, and James Hardie within our single-contract model. James Hardie siding is our default specification for West Hollywood’s Spanish Colonial and Mediterranean contexts - the fiber-cement texture reads as stucco-adjacent without the ongoing maintenance cost, and we stock local material allocations to avoid the 6-8 week lead times that can stall a WeHo inspection sequence. Every brand we specify is covered under the same written price and 365-Day Done Right Promise; no separate warranty chase if the siding fails or the module doesn’t seal.
Common New Detached ADU Problems We See in West Hollywood Homes
- LADBS rules applied to WeHo lots. Contractors who pull permits in Los Angeles daily routinely use LADBS alley setback and easement standards on West Hollywood properties, then receive correction notices from WeHo Public Works because the city enforces its own alley grid rules. We verify alley setback, trash-truck clearance, and utility easement width with WeHo staff before we draw the foundation.
- RSO analysis skipped on multi-unit lots. West Hollywood’s Rent Stabilization Ordinance covers virtually every pre-1979 multifamily building in the city. Adding a detached ADU on a lot with an existing RSO unit without analyzing tenant protections can inadvertently alter a unit’s protected status, triggering a legal review that blocks the permit for months. We run RSO analysis as standard on any multi-unit lot.
- Hillside costs underestimated near Doheny and Sunset. Parcels approaching the Hollywood Hills foothills can require engineered retaining walls and hillside grading that add $25,000-$75,000 compared to flat central blocks. We scope geotechnical review and grading in our written price before work starts, not after the first shovel hits slope.
- Dingbat soft-story assumptions. West Hollywood’s 1960s-1970s soft-story apartment buildings often already have seismic retrofit steel moment frames in the tuck-under parking. That changes everything about a parking-to-ADU conversion layout, but contractors unfamiliar with WeHo’s mandatory retrofit ordinance miss the opportunity or double-count work already done. We verify existing retrofit documentation before we quote.
Pricing for New Detached ADU in West Hollywood, CA
New detached ADU pricing in West Hollywood breaks down by type and site condition:
| ADU Type | Typical Range (All-In) | Notes |
|---|---|---|
| Studio ADU (300-450 sq ft) | $280,000-$380,000 | Flat lot, standard alley access, single-zone mini-split |
| 1-Bed ADU (450-600 sq ft) | $320,000-$420,000 | Includes kitchen separation, full bath, WeHo standard finishes |
| 2-Bed ADU (600-800 sq ft) | $380,000-$520,000 | Requires larger lot coverage; may trigger design review |
| Prefab/Modular (studio-2 bed) | $280,000-$480,000 | Foundation and site prep separate; crane access required |
| Hillside surcharge (Doheny/Sunset area) | +$25,000-$75,000 | Engineered retaining wall, grading, geotechnical review |
These ranges include permit set, WeHo building permit fees, construction, and final inspection. They do not include optional upgrades like solar, EV charging, or premium appliance packages. Under Haven Standard Clause 1, every project receives a written price before any work begins - no “call for a quote,” no open-ended allowances. Call (747) 322-4648 for your written estimate.
We Also Serve Cities Near West Hollywood
Our crews work throughout the metro core, including West Hollywood and neighboring Beverly Hills, Studio City, North Hollywood, and Sherman Oaks. Each city carries its own permitting authority and code interpretations; we verify the correct jurisdiction before we draw, not after we submit.
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
West Hollywood permits go through the city’s own Building & Safety division, not LADBS. WeHo is an independent incorporated city, and using LADBS forms or standards will get your application rejected at intake. We pull WeHo permits directly and know the staff, the correction notice patterns, and the RSO review triggers.
Call (747) 322-4648 if you’re unsure which jurisdiction applies to your property - we’ll verify it before we quote.
Yes, if your lot contains any pre-1979 multifamily unit covered by West Hollywood’s RSO. The ordinance is among the strongest in California, and adding a detached ADU can inadvertently alter an existing unit’s protected status if the analysis isn’t done upfront. We run RSO analysis as standard on every multi-unit lot before permit submission.
Call (747) 322-4648 for a free estimate with RSO review included.
Yes. Most of West Hollywood’s 1920s-1950s lots are 25-50 feet wide, and the city’s ADU ordinance allows detached units on these narrow parcels with reduced rear and side setbacks compared to standard dwelling units. We design vertically - often a single-story studio or compact 1-bedroom - to preserve the required rear yard while maximizing floor area. Alley access is typically the determining factor, not lot width.
Call (747) 322-4648 to review your specific lot dimensions.
Parcels near Doheny Drive and Sunset Boulevard approach the Hollywood Hills foothills, where graded slopes often require engineered retaining walls, soil nailing, or geotechnical review before foundation work can begin. These items add $25,000-$75,000 to a project that would sit on flat ground near Santa Monica Boulevard or Melrose. We scope hillside conditions in our written price before work starts, not after the first correction notice.
Call (747) 322-4648 for a site-specific estimate.
West Hollywood’s mandatory soft-story seismic retrofit ordinance means many dingbat buildings already have steel moment frames or shear walls in the ground-floor parking. That existing structure significantly reshapes layout options and cost assumptions for any parking-to-ADU conversion - sometimes reducing foundation work, sometimes complicating MEP routing through existing steel. We verify existing retrofit documentation and coordinate with WeHo’s structural plan check before we quote.
Call (747) 322-4648 for a Free Second Opinion on any written estimate already in hand.
Contact Ellery ADU Studio Burbank
Every new detached ADU in West Hollywood starts with a written price, a verified permit path, and a documented photo record on every site visit. Under Haven Standard Clause 1, you’ll know the full cost before any work begins. Under Clause 5, the scope is locked at signing - no door-side upsells, no scope creep. And under the 365-Day Done Right Promise, if the finished ADU isn’t built to the permitted drawings, we make it right.
Call (747) 322-4648 to schedule your free estimate. A live person answers 24/7.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving West Hollywood since 2015.
New Detached ADU in Nearby Areas
