Fast, Reliable New Detached ADU Across West Hollywood
A new detached ADU in West Hollywood typically runs $320,000-$580,000 all-in, from permit-ready drawings through final inspection, depending on whether you choose custom stick-build, prefab, or modular construction. We’re Ellery ADU Studio, and we’ve designed, permitted, and built ADUs in West Hollywood since 2015 - the year California’s ADU laws shifted. Our New Detached ADU team coordinates every stage under one contract at one written price, with no designer-versus-builder blame gap. Call (213) 329-7167 to schedule your free estimate. We dispatch and schedule from our Los Angeles office; crews serve West Hollywood locally.
Why Ellery ADU Studio West Hollywood Is West Hollywood’s Preferred New Detached ADU Company
We’ve completed ADU projects on streets from Ogden Drive to Laurel Avenue, and we know the difference between LADBS plan check and WeHo’s Community Development Department process. That local fluency matters. A plan set that sails through Los Angeles can come back from West Hollywood requiring facade revisions to match surrounding Spanish Colonial Revival massing - and if your lot carries rent-stabilized units, there’s an RSO layer that doesn’t exist one block east.
Our clients in West Hollywood receive the same documentation every Ellery customer gets: a written price before any work starts, per Haven Standard Clause 1; a documented photo record on every visit; and the 365-Day Done Right Promise, backed in writing. We’ve designed, permitted, and built 900+ ADUs since 2015. Every one had a written price before work started. Every one finished with a photo record.
A live person answers our phones 24/7. No voicemail queue. If you already have a written estimate in hand, we’ll give you a Free Second Opinion.
Our New Detached ADU Services in West Hollywood
Custom Built ADU
Custom stick-build detached ADUs in West Hollywood range from $380,000-$580,000 all-in. This is the right path when your lot has unusual constraints - a tight side yard between two-story stucco apartment buildings, a shared driveway with limited staging, or a need to match existing Spanish Colonial Revival detailing for Community Development Department massing review. We produce the full permit set in-house, coordinate structural and MEP, and build what we drew. One contract. One written price.
Prefab ADU Installation
Prefab detached ADUs in West Hollywood typically run $320,000-$450,000, including site prep, foundation, utility tie-ins, and finish. We specify and coordinate systems from brands including Abodu, Cover, and Plant Prefab - all within the same single contract that covers design, permitting, and installation. Prefab works well on WeHo’s tight lots because factory-built modules reduce on-site construction days, which matters when you’re working under strict local work-hour ordinances and neighbors who share a wall or driveway.
Modular ADU
Modular construction in West Hollywood falls in the $340,000-$480,000 range. Modular units arrive as fully finished volumetric sections, craned into place and sealed on-site. This method shines where staging space is minimal - common on the small-lot bungalows and bungalow courts behind Laurel Avenue or near the Melrose corridor. We coordinate modular brands including Dvele and Mighty Buildings, and we handle the WeHo-specific foundation, utility, and facade-integration details that factory sales teams rarely scope accurately.
Studio ADU & 1-Bed & 2-Bed ADU
Studio detached ADUs in West Hollywood start around $320,000; 1-bedroom units typically run $350,000-$480,000; 2-bedroom units range $420,000-$580,000. Size drives cost, but so does mechanical complexity. On WeHo’s dense lots, a 2-bed detached ADU almost always needs mechanical HVAC and upgraded electrical service - the original 60-amp panels in pre-1970s garages can’t handle modern loads. We size these systems during design, not after framing starts. Haven Standard Clause 5 locks the scope at signing; no door-side upsells.
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 Tuff Shed, James Hardie, Abodu, Cover, and other factory partners - all within our single-contract model. For the Ogden Drive project, we framed a Tuff Shed shell and trimmed it in James Hardie siding specifically to pass WeHo’s design-compatibility review on the first submittal. We don’t sell you a brand and walk away. We integrate the factory system with West Hollywood’s foundation, utility, and facade requirements, and we warranty the result.
Common New Detached ADU Problems We See in West Hollywood Homes
- Assuming LADBS rules apply. West Hollywood’s Community Development Department adds local design-compatibility review to every detached ADU. A massing and facade set that clears LA plan check can come back requiring revisions even one block inside the city line. We produce permit sets for WeHo’s specific reviewers, not LA’s.
- Missing the RSO layer. On lots with existing rent-stabilized units, WeHo’s Rent Stabilization Ordinance creates a pre-permitting checkpoint that contractors unfamiliar with the city never see coming. We scope RSO implications before any demo or submittal.
- Underscoping site access. Slab-on-grade garages, shared driveways, and single-car apron parking mean staging time and material handling drive real cost. A quote that ignores these constraints balloons once the crew arrives. We walk the site first.
- Designing for natural ventilation. With two-story apartment structures abutting side and rear yards, light and cross-ventilation are minimal. A detached ADU that assumes operable windows ends up needing mechanical HVAC anyway. We design for the actual site conditions.
Pricing for New Detached ADU in West Hollywood, CA
Here’s what new detached ADU construction costs in West Hollywood’s current market:
| Sub-Service | Typical All-In Range |
|---|---|
| Studio ADU (custom) | $320,000-$420,000 |
| 1-Bed ADU (custom) | $380,000-$480,000 |
| 2-Bed ADU (custom) | $450,000-$580,000 |
| Prefab ADU Installation | $320,000-$450,000 |
| Modular ADU | $340,000-$480,000 |
What moves you within these ranges: foundation type (slab-on-grade garage replacement vs. new stem wall on undisturbed soil), utility distance (sewer lateral extension across a deep lot adds trenching and permit complexity), facade material selection (James Hardie or stucco to match existing streetscape), and mechanical system sizing (mini-split vs. full ducted HVAC). Every Ellery project is quoted with a written price before any work begins, per Haven Standard Clause 1. Call (213) 329-7167 for your exact number - estimates are free.
We Also Serve Cities Near West Hollywood
Our crews work across the metro core, including West Hollywood, Studio City, North Hollywood, Sherman Oaks, and Culver City. Each city has its own planning department, its own ADU ordinance, and its own access constraints - and we produce permit sets for the specific reviewers who will read them.
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. West Hollywood’s Community Development Department applies local design-compatibility review that LADBS does not, meaning your detached ADU’s massing and facade must respect surrounding Spanish Colonial Revival and bungalow-court streetscapes. We produce permit sets specifically for WeHo’s reviewers, not LA’s, which reduces revision cycles and protects your timeline. Call (213) 329-7167 for a Free Second Opinion on any estimate already in hand.
WeHo’s Rent Stabilization Ordinance (RSO), enacted in 1984, creates a pre-permitting checkpoint on any lot with existing rent-stabilized units. The RSO implications must be scoped and cleared before demo or permit submittal, or the project stalls. We navigate this layer as part of our standard due diligence - not as an afterthought. Call (213) 329-7167 to schedule your free estimate.
Tight lots mean staging from a single driveway apron, coordinating material deliveries to minimize street occupancy, and accounting for party-wall notice obligations to neighbors. These constraints add real line items - crane rental for modular sets, protected sidewalk staging, compressed construction schedules under work-hour ordinances - that a generic quote misses. We walk the site before we price it. Haven Standard Clause 5 locks the scope at signing; no surprises after. Call (213) 329-7167 for your written quote.
West Hollywood’s dense urban infill means most detached ADUs sit in side or rear yards with minimal natural light and little cross-ventilation from neighboring two-story structures. Even in LA’s mild Mediterranean climate, a free-standing ADU elsewhere could rely on operable windows - here, mechanical cooling and heating are typically required for habitability and code compliance. We size these systems during design, not after framing. Call (213) 329-7167 to schedule your free estimate.
Most pre-1970s garages in West Hollywood have slab-on-grade concrete floors, original 60-amp electrical panels, and zero wall insulation. Before framing begins, we routinely upgrade the panel to 200-amp service, install proper foundation anchorage or replace the slab, and rough in plumbing and electrical underground. These are not “maybe” items - they’re standard on nearly every garage conversion we see on streets like Ogden Drive and Laurel Avenue. Call (213) 329-7167 for an exact scope and written price.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving West Hollywood since 2015.