Fast, Reliable New Detached ADU Across West Hollywood
A new detached ADU in West Hollywood typically runs $220,000-$380,000 all-in for a ground-up build, though most West Hollywood parcels are so densely built that the practical “detached” solution is a garage-bay conversion at $165,000-$275,000. Either way, you’ll receive a written price before any work starts, per Haven Standard Clause 1. Call (424) 551-7706 to schedule your free estimate.
We’ve designed, permitted, and built ADUs across West Hollywood’s 1.9 square miles since 2015 - from the dingbat apartments lining Fountain Avenue to the courtyard bungalows near Melrose. Our permit sets are prepared in-house, and our crews coordinate scheduling from our Los Angeles office with same-week site visits to West Hollywood properties. We know the city’s Rent Stabilization Ordinance, its soft-story seismic retrofit requirements, and the specific headache of converting a tuck-under parking bay that’s listed as a tenant amenity. That local fluency keeps permits moving and change orders rare.
Why Ellery ADU Studio Los Angeles Is West Hollywood’s Preferred New Detached ADU Company
West Hollywood homeowners find us after they’ve already talked to a contractor who treated the permit set as an afterthought. We’re a design-build studio - the drawings, the permit package, and the construction sit under one contract at one written price. No designer-builder blame gap. No “call for a quote.” Haven Standard Clause 1 locks your price at signing.
Our reputation here is built on documentation. Every visit produces a photo record. Every project starts with a written scope. Our 365-Day Done Right Promise is backed in writing before demo begins. We’ve completed 900+ ADUs since 2015, each with a documented photo record at completion.
Response time matters in a city this small. We typically schedule West Hollywood site visits within 3-5 business days of your call. A live person answers our phone 24/7 - no voicemail queue, no callback that doesn’t materialize.
What separates us is local code fluency. West Hollywood’s RSO is administered by its own Rent Stabilization & Housing department, separate from LA County. A converted garage space listed on a tenant lease as included parking is treated as a protected housing service. Removing it without proper notice and relocation compensation violates the ordinance. We check leases before we touch a wall. Most ADU builders accustomed to LARSO rules just blocks away in Los Angeles miss this entirely.
Our New Detached ADU Services in West Hollywood
Custom Built ADU
Custom built ADUs in West Hollywood are rare as true ground-up structures - most parcels lack the side or rear yard setback. When we do build custom detached, it’s typically on one of the few single-family lots north of Sunset or in the Norma Triangle area where 1920s cottages sit on deeper lots. A custom build here runs $280,000-$380,000 all-in, drawings through final inspection. We handle the variance process if your setback is tight, and we sequence the foundation work around West Hollywood’s limited staging space - often coordinating crane access from adjacent streets with the city’s film-permit office, since production closures can block access without warning.
Prefab ADU Installation
Prefab ADU systems from Abodu and Cover work well on West Hollywood’s few buildable sites where crane access is feasible. We’ve specified Abodu units for properties near La Cienega where the side yard accommodates a one-bedroom module delivered in two pieces. Prefab installations in West Hollywood run $220,000-$320,000, including the crane, utility tie-ins, and foundation. The advantage is speed - module delivery to certificate of occupancy can run 6-9 months versus 12-18 for stick-built - but the constraint is always the site. We evaluate crane swing radius, overhead power lines, and street width before we quote. No surprises.
Modular ADU
Modular ADU construction from Dvele and other factory-built systems suits West Hollywood’s code environment because the permit set is complete before site work begins. That matters here: West Hollywood’s building department reviews closely, and an incomplete submittal costs weeks. Modular units in West Hollywood typically run $240,000-$340,000 installed. We coordinate factory inspection schedules with the city’s phased inspection requirements, and we handle the HCD (California Department of Housing and Community Development) factory approval integration that many local contractors haven’t encountered.
Studio ADU
Studio ADUs are the most common conversion we execute in West Hollywood - a single tuck-under parking bay becomes a 350-450 square foot rental unit. These run $165,000-$225,000 all-in. The critical path is almost never the construction; it’s the RSO compliance. We review the tenant lease to confirm whether the bay is listed as an included parking service. If it is, we coordinate with the property owner on relocation notice and compensation before permit submittal. We’ve seen projects stall for months because a previous contractor skipped this step. We don’t.
1-Bed & 2-Bed ADU
One-bedroom and two-bedroom ADUs in West Hollywood typically require combining two adjacent parking bays or converting a ground-floor storage area plus parking. These run $195,000-$275,000. The framing challenge is real: 1950s-60s dingbat construction often has 2×4 studs at 24 inches on center, undersized for current code loads. We write a reframing allowance into every contract for bays built before 1975. Our crew opened the ground-floor tuck-under parking bay of a 1958 dingbat on Havenhurst Drive and found the slab had been poured 4 inches below the finish floor with no capillary break, so the furred-out walls were wicking moisture into wood framing that had already been sistered twice. We ran the inspection first, wrote a waterproofing and reframing allowance into the contract, then priced the undersized panel and the new mini-split skid in writing before demo - the client approved the change order the same day and we sequenced the work alongside the soft-story seismic retrofit drawings already on the property.
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 within the same single contract that covers your design, permitting, and build. For site-built work, we use James Hardie fiber-cement siding extensively on West Hollywood conversions - it handles the urban dust and heat cycling better than stucco retrofits on existing structures, and it meets the city’s design-review aesthetic requirements for street-facing units. Parts and replacement materials are stocked through our Los Angeles supply chain with 2-3 day turnaround to West Hollywood job sites, so a damaged panel or failed mini-split compressor doesn’t stall your certificate of occupancy.
Common New Detached ADU Problems We See in West Hollywood Homes
- RSO lease violations on parking conversion. Opening a tuck-under parking bay on an RSO-covered dingbat without checking the tenant lease first - removing listed parking without relocation notice is a protected-services violation, not just a construction problem. We pull the lease during our initial site evaluation, before we price the job.
- Failed waterproofing in 1950s-60s stucco bays. Discovering failed waterproofing and undersized framing only after walls are open on a 1950s-60s stucco bay blows the quote unless allowances were written in before demo. Our contracts include a “pre-1975 bay” allowance for reframing, moisture remediation, and slab repair.
- Heat-trapping without mechanical ventilation. Building a stuffy converted bay with no mechanical ventilation - north-facing, slab-on-grade, masonry-surrounded units trap West Hollywood’s afternoon heat and won’t pass habitability checks without mini-splits. We size Mitsubishi or Daikin mini-split systems for every conversion; it’s non-negotiable.
- Soft-story retrofit sequencing conflicts. Many dingbat properties are under mandatory soft-story seismic retrofit orders. Starting ADU conversion before coordinating with the retrofit engineer means tearing out work the seismic contractor needs to access. We review the city’s retrofit database and coordinate drawings before permit pull.
Pricing for New Detached ADU in West Hollywood, CA
Here’s what new detached ADU work costs in West Hollywood’s market:
| ADU Type | Typical Range (All-In) |
|---|---|
| Studio ADU (single bay conversion) | $165,000 - $225,000 |
| 1-Bed ADU (expanded bay or small ground-up) | $195,000 - $275,000 |
| 2-Bed ADU (combined bays or compact detached) | $240,000 - $320,000 |
| Custom detached (rare, larger lot required) | $280,000 - $380,000 |
| Prefab/modular installed | $220,000 - $340,000 |
What moves the number: RSO compliance costs if relocation fees apply, soft-story retrofit coordination, slab condition and waterproofing needs, electrical service upgrades from 60-amp to 100-amp or 200-amp panels, and mini-split sizing for West Hollywood’s heat-trapping urban geometry. Every project is quoted with a written price before any work begins - Haven Standard Clause 1. No exceptions. Call (424) 551-7706 for your free estimate.
We Also Serve Cities Near West Hollywood
Our New Detached ADU in West Hollywood crew works across the full metro corridor, including Beverly Hills, Studio City, North Hollywood, and Sherman Oaks. Each city has its own ADU ordinance quirks - Beverly Hills has stricter design review, Studio City and Sherman Oaks fall under LARSO rather than WeHo’s RSO - and we adjust our permit sets accordingly. If you’re comparing options across neighborhoods, we offer a Free Second Opinion on any written estimate already in hand.
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
Probably not as a ground-up structure. West Hollywood’s 1.9-square-mile footprint is so densely built that usable yard space for detached ADUs is nearly nonexistent on most parcels. The practical “detached” solution here is usually a garage-bay conversion, most commonly the tuck-under parking bays of 1950s-60s dingbat apartment buildings. We evaluate your specific parcel during our free site visit. Call (424) 551-7706 to schedule.
Yes, but the lease language matters. West Hollywood’s Rent Stabilization Ordinance covers nearly every multi-unit property in the city, and a garage bay listed as a tenant amenity in an RSO-covered lease triggers mandatory relocation fees and just-cause obligations when removed. We review your lease during initial evaluation and coordinate the required notices before permit submittal. This doesn’t apply the same way under LARSO in Los Angeles or in Beverly Hills. Call (424) 551-7706 and we’ll walk through your specific situation.
Because what we find behind 1950s stucco and under 4-inch slabs isn’t visible until demo. Failed waterproofing, undersized 2×4 framing at 24-inch spacing, and electrical panels that won’t handle a second dwelling unit are standard on pre-1975 dingbat construction. We handle this with inspection-first protocols and written allowances in the contract - not guesswork. Any surprise is priced and approved in writing before we touch it, per Haven Standard Clause 5 (No Surprises). The original quote moves only with your signature.
Yes, if your building is on the city’s mandatory retrofit list. Many West Hollywood dingbats must complete soft-story seismic work, and the ADU conversion can’t ignore it. We check the city’s retrofit database during our initial evaluation and sequence the drawings so you’re not paying twice for foundation access or wall removal. Combining both compliance tracks typically saves 15-25% versus handling them separately. Call (424) 551-7706 to check your property’s status.
West Hollywood’s dense urban flatland traps afternoon heat more than nearby coastal neighborhoods, and converted dingbat ground-floor bays - concrete-slab, often north-facing, surrounded by masonry - become uninhabitable without mechanical ventilation. Natural airflow isn’t sufficient. We size Mitsubishi or Daikin mini-split heat pump systems for every conversion, and we include the electrical upgrade in your written quote. Habitability inspectors flag inadequate climate control; we don’t let that happen. Call (424) 551-7706 for an exact system specification.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving West Hollywood since 2015.