Fast, Reliable New Detached ADU Across West Hollywood
A new detached ADU in West Hollywood typically runs $285,000-$520,000 all-in, from permit set through final inspection, with custom millwork and architectural glass lead times setting the calendar rather than framing labor. We’re Ellery ADU Studio Westchester, and our New Detached ADU team coordinates design, permitting, and construction under one written contract for West Hollywood homeowners. Dispatch and scheduling run from our Los Angeles office, but crews serve West Hollywood locally and understand the specific compliance layers that derail projects here. Call (213) 698-7591 to schedule your free estimate.
Why Ellery ADU Studio Westchester Is West Hollywood’s Preferred New Detached ADU Company
We’ve designed, permitted, and built ADUs across West Hollywood since 2015, the year California’s ADU laws shifted statewide. Our reputation here rests on documentation: a written price before any work starts, a photo record on every visit, and the 365-Day Done Right Promise backed in writing under The Haven Standard. West Hollywood clients specifically mention our permit-set thoroughness in reviews - the drawings that actually get approved, not the ones that bounce back from WeHo Planning with correction notices.
Response time to West Hollywood inquiries is same-day during business hours, and a live person answers calls 24/7. We know the difference between a courtyard bungalow lot on Huntley and a dingbat parcel on Sweetzer, and we pull permit history before quoting. That local specificity matters because West Hollywood’s building stock - 1920s Spanish Revival duplexes, 1960s courtyard complexes, retrofitted dingbats - carries structural and regulatory layers that contractors from outside the city routinely miss.
Our license number appears on every page, verified, not just claimed. Background-checked, uniformed crews work under that license on every West Hollywood site.
Our New Detached ADU Services in West Hollywood
Custom Built ADU
Custom built ADUs in West Hollywood typically run $320,000-$520,000 all-in, drawings through final inspection. On this tier, the schedule follows long-lead items: rift-oak millwork at 12-16 weeks, architectural glass panels at 10-14 weeks, specialty metalwork at 8-12 weeks. We fix the price in writing before any fabrication order goes out - Haven Standard, Clause 1 - so when the architect revises a dimension, the re-order cost is visible, not absorbed silently. On a 1920s Spanish Revival duplex near Fountain and La Jolla, our crew pulled the soft-story retrofit permit history before quoting and found the dingbat tuck-under bay already carried a new steel moment frame. We re-engineered around the retrofit and placed a detached studio ADU at the rear, coordinating full-height architectural glass panels and rift-oak millwork with the owner’s architect. The schedule ran on 14-week millwork and glass lead times, not our framing crew - and the price was fixed in writing before the first fabrication order went out.
Prefab ADU Installation
Prefab ADU installation in West Hollywood ranges from $285,000-$395,000 all-in, depending on foundation complexity and utility tie-ins. We specify and coordinate systems from Mighty Buildings, Plant Prefab, and Boxabl within the same single contract that covers design, permitting, and site work. West Hollywood’s tight rear-yard setbacks on 6,000 sq ft lots mean crane placement and module delivery sequencing require advance coordination with WeHo Building & Safety. We handle that coordination; the price includes it.
Modular ADU
Modular ADUs in West Hollywood typically fall between $295,000-$420,000 all-in. The advantage here is factory precision for the envelope, with custom interior finishes added on-site. On WeHo’s multifamily parcels, modular delivery must account for existing tenant access and parking - a scheduling constraint we build into the contract, not discover mid-project. We pull the soft-story retrofit history before finalizing foundation plans, since retrofitted dingbat bays often carry structural modifications invisible from the surface.
Studio ADU
Studio ADUs in West Hollywood run $285,000-$365,000 all-in. These are the most common detached ADU type on WeHo’s smaller lots, particularly in the Norma Triangle and West Hollywood West neighborhoods where rear-yard depth is limited. Every studio ADU we build includes dedicated mini-split HVAC and electrical-panel capacity for it - non-optional in WeHo’s inland climate, where south- and west-facing units without mechanical cooling hit uncomfortable afternoon temperatures that Santa Monica clients rarely anticipate.
1-Bed & 2-Bed ADU
One-bedroom detached ADUs in West Hollywood typically run $310,000-$440,000; two-bedroom units run $380,000-$520,000. The bedroom count drives foundation size, utility capacity, and parking waiver documentation. On multifamily parcels, these larger units also trigger more stringent RSO anti-displacement compliance during construction. We handle tenant noticing and protection protocols as part of our standard scope - not an add-on, not an afterthought.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
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 Mighty Buildings, Plant Prefab, and Boxabl within the same single contract that covers your full project. For West Hollywood clients, this means one written price, one point of accountability, and no designer-versus-builder blame gap if a module dimension conflicts with WeHo’s setback requirements. We maintain direct supplier relationships and local coordination capacity, so when a Plant Prefab module needs field modification to clear a retrofitted moment frame, the re-engineering is scoped and priced before fabrication, not discovered on delivery day.
Common New Detached ADU Problems We See in West Hollywood Homes
- Soft-story retrofit collisions. Contractors who don’t pull West Hollywood’s retrofit permit history before quoting a detached ADU regularly collide with moment frames or steel shear panels already installed in tuck-under bays. The re-engineering adds $15,000-$40,000 and weeks to the schedule. We pull that history before the first number goes on paper.
- HVAC treated as optional. WeHo’s inland location means less marine-layer cooling than Santa Monica or Culver City. South- and west-facing detached ADUs without dedicated mini-split systems and upgraded electrical panels become unrentable ovens by 3 PM. We include both in every quote.
- RSO anti-displacement violations. On multifamily parcels, disturbing existing tenants without proper noticing and protection can halt construction outright. Most contractors from outside WeHo don’t know this layer exists. We build compliance into the project timeline from day one.
- Long-lead ordering before design lock. Custom millwork and architectural glass ordered before dimensions are final mean re-orders at 12-16 week lead times. We fix the design and the price in writing before any fabrication order - Haven Standard, Clause 5 (No Surprises).
Pricing for New Detached ADU in West Hollywood, CA
| ADU Type | Typical Range (All-In) |
|---|---|
| Studio ADU | $285,000 - $365,000 |
| 1-Bed ADU | $310,000 - $440,000 |
| 2-Bed ADU | $380,000 - $520,000 |
| Custom Built ADU (high-end) | $320,000 - $520,000 |
| Prefab/Modular ADU | $285,000 - $420,000 |
These ranges include the full scope: permit set, city submittal, revisions, construction, final inspection, and the documented photo record you receive at completion. What moves a project within the range: foundation complexity on WeHo’s often-sloping lots, utility tie-in distance from the main structure, custom finish specifications, and whether the parcel carries soft-story retrofit constraints that require re-engineering. Every project is quoted with a written price before any work begins - Haven Standard, Clause 1. No “call for pricing.” No scope creep. Call (213) 698-7591 for your exact number; estimates are free.
We Also Serve Cities Near West Hollywood
Our crews work across the Westside and San Fernando Valley, including West Hollywood, Beverly Hills, Studio City, Sherman Oaks, and Culver City. Each city carries its own permit timeline, setback rules, and housing-stock quirks. We adjust the permit set and construction approach accordingly, never paste the same plan across jurisdictions.
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. While West Hollywood’s Rent Stabilization Ordinance covers virtually all pre-1979 buildings that make up the city’s housing stock, a newly built detached ADU sits outside RSO coverage entirely and can be rented at WeHo’s premium market rate from day one. This RSO-exempt status is why ADUs are uniquely lucrative here compared to converting existing RSO-covered units. Call (213) 698-7591 for an exact quote on your parcel - estimates are free.
Because dingbat buildings that completed WeHo’s mandatory soft-story seismic retrofit program often have new moment frames or steel shear panels installed exactly where owners want to build. Contractors who skip this check underbid by $15,000-$40,000, then hit unexpected structural re-engineering mid-project. We pull that permit history before quoting; the price you sign includes what we find. Call (213) 698-7591 to start.
Yes. West Hollywood sits far enough inland that south- and west-facing ADUs regularly hit uncomfortable afternoon temperatures without mechanical cooling. Mini-split HVAC and the electrical-panel upgrade to support it add roughly $8,000-$14,000 to the project, but without it, the unit is functionally unrentable in summer. We include both in every West Hollywood quote. Call (213) 698-7591 for specifics on your site.
RSO triggers strict anti-displacement rules during construction: existing tenants must be properly noticed and protected throughout the project, and improper disturbance can halt work outright. The new detached ADU itself is exempt from RSO once complete, but the construction phase is heavily regulated. We build tenant compliance into the project timeline and documentation from day one. Call (213) 698-7591 to discuss your parcel’s specific requirements.
Long-lead custom items, not framing labor. Rift-oak millwork at 12-16 weeks. Architectural glass panels at 10-14 weeks. Specialty metalwork at 8-12 weeks. The framing crew finishes in four to six weeks; the schedule waits on fabrication. That’s why we fix the design and price in writing before ordering - re-orders restart the clock. Call (213) 698-7591 to lock your timeline and price.
Written by Nadia Ellery, Owner at Ellery ADU Studio Westchester, serving West Hollywood since 2015.