ADU in West Hollywood, CA
A Junior ADU or interior conversion in West Hollywood typically runs $85,000-$165,000 all-in, from measured drawings through final inspection, while site prep and utility work adds $15,000-$45,000 depending on what the 1920s-1950s housing stock requires. We’re Ellery ADU Studio, and we handle both under one contract at one written price. Call (424) 523-8492 to schedule your free estimate.
Why West Hollywood Homes Are Different
West Hollywood sits on its own municipal island, not part of Los Angeles, with a standalone Community Development Department that uses its own plan-check checklist and its own timeline. Contractors who assume WeHo follows LADBS fast-track rules get sent back to revise drawings for requirements LA City would waive.
The housing stock is old and tight: 1920s-1950s courtyard bungalows, Spanish Colonial Revival duplexes, and post-war stucco apartments on lots usually under 6,500 square feet. Knob-and-tube or early Romex wiring and undersized electrical panels are routine. WeHo’s inland basin position brings hotter summer afternoons than coastal West LA, so detached garage conversions need dedicated mini-split systems, not passive ventilation, to meet Title 24 and be livable.
Then there’s the rent stabilization layer. Any ADU on a lot with pre-1979 rental units must be structured to avoid triggering West Hollywood’s RSO relocation assistance and just-cause eviction requirements. This compliance layer doesn’t exist the same way one block east in LA proper.
Our Main West Hollywood Services
West Hollywood homeowners most often ask us about these three services, each with its own dedicated page and pricing.
ADU Design & Permitting in West Hollywood
WeHo’s separate submittal system demands a permit set built specifically for its checklist, not recycled from LADBS. Our drawings include Title 24 energy calculations, structural calcs for the existing building, and RSO compliance review where applicable. ADU Design & Permitting in West Hollywood covers the full process from survey to issued permit.
Garage Conversion ADU in West Hollywood
Detached rear garages dominate WeHo’s small lots, making this the most common project type. The existing slab, framing, and utility stub-ins get evaluated against current code; most need electrical service upgrades and mini-split HVAC to pass inspection. Garage Conversion ADU in West Hollywood details our single-contract process.
New Detached ADU in West Hollywood
On the few lots with adequate rear yard space, a new detached unit faces strict setback, height, and lot-coverage rules under WeHo’s standalone ordinance. We coordinate prefab systems from Abodu or Cover when the site allows factory-built efficiency. New Detached ADU in West Hollywood explains feasibility and pricing.
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.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Before
AfterJunior ADU & Interior Conversion in West Hollywood
Junior ADU & Interior Conversion in West Hollywood solves the problem of adding rental income or family housing without touching the lot’s footprint, critical on 4,000-6,000 square foot parcels where a detached ADU won’t fit. We convert existing interior space - basements, above-garage rooms, spare bedrooms, or attached additions - into self-contained units with kitchenettes and private entrances, navigating WeHo’s RSO rules where the main property has pre-1979 units. Junior ADU & Interior Conversion is the service hub for all interior ADU types.
Basement ADU
Signs you need it
You have a walk-out or daylight basement with ceiling height over 7 feet 6 inches, separate exterior access, and a main house that predates 1955.
What it costs in West Hollywood
Basement ADU conversions in West Hollywood typically run $95,000-$175,000 all-in, including moisture mitigation, egress windows, and full MEP.
How we do it
We test for moisture intrusion, design perimeter drainage if needed, add egress windows to meet WeHo fire code, run new electrical and plumbing from the upgraded service, and build out the kitchenette and bath to permitted drawings.
Room-to-ADU Conversion
Signs you need it
You have a 250+ square foot ground-floor room with an exterior wall, existing window, and hallway access that can be rerouted to a private entry.
What it costs in West Hollywood
Room-to-ADU conversions in West Hollywood typically run $75,000-$140,000 all-in, depending on whether the existing bathroom can be adapted or must be built new.
How we do it
We survey the existing layout, design a private entry and sound separation per WeHo code, add a kitchenette line, adapt or build the bathroom, and submit the full permit set with Title 24 compliance documentation.
What Junior ADU & Interior Conversion Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Basement ADU conversion | $95,000 - $175,000 |
| Room-to-ADU conversion | $75,000 - $140,000 |
| Above-garage ADU conversion | $85,000 - $155,000 |
Can a Junior ADU have a full kitchen in West Hollywood?
No. California law limits Junior ADUs to kitchenettes - no permanent range or built-in oven - though a full ADU conversion of the same space can include complete cooking facilities if the permit set is filed accordingly. Call (424) 523-8492 to discuss which path fits your property.
Will an interior conversion trigger West Hollywood’s RSO rules?
It depends on whether your lot contains pre-1979 rental units and how the new unit is tenanted; we structure the ownership and lease terms during design to avoid triggering relocation assistance requirements. Call (424) 523-8492 for a compliance review on your specific parcel.
ADU Site Prep & Utilities in West Hollywood
ADU Site Prep & Utilities in West Hollywood addresses what the old housing stock hides: undersized electrical panels, clay sewer laterals, and uninsulated structures that can’t pass modern code without intervention. We open walls and ground to verify conditions, then upgrade systems before the finished build starts, so no certificate of occupancy gets held up by a failed final inspection. ADU Site Prep & Utilities covers our full scope.
Electrical Panel Upgrade
Signs you need it
Your panel is 100 amps or less, contains Federal Pacific or Zinsco breakers, or the main house already pushes capacity with window AC units and electric dryers.
What it costs in West Hollywood
Electrical panel upgrades in West Hollywood typically run $4,500-$12,000, including permit, inspection, and utility coordination with SCE.
How we do it
We size the new load for main house plus ADU, coordinate Southern California Edison for service release, pull WeHo permits, install the new panel and grounding system, and pass inspection before rough-in begins.
Plumbing Lateral
Signs you need it
Your sewer lateral is original cast iron or clay, you’ve had backups or slow drains, or the city has flagged your line in a previous inspection.
What it costs in West Hollywood
Plumbing lateral replacement in West Hollywood typically runs $8,000-$18,000 for trenchless methods, or $12,000-$28,000 for open-trench excavation through existing hardscape.
How we do it
We camera the line to locate failures, design the replacement route minimizing driveway and patio disruption, pull WeHo encroachment permits if needed, and coordinate inspection before backfill.
What ADU Site Prep & Utilities Costs in West Hollywood
| Item | Typical range in West Hollywood |
|---|---|
| Electrical panel upgrade | $4,500 - $12,000 |
| Plumbing lateral replacement | $8,000 - $28,000 |
| Gas line extension | $3,500 - $9,000 |
Does every West Hollywood ADU need an electrical upgrade?
Most do, given the age of WeHo’s housing stock; we verify panel capacity during our initial survey and include the upgrade in the written scope if needed. Call (424) 523-8492 to schedule a load calculation.
Who pulls permits for utility work in West Hollywood?
We pull all permits through WeHo’s Community Development Department as part of our single-contract scope; you do not coordinate with the city separately. Call (424) 523-8492 to confirm your project’s permit path.
Brands We Service in West Hollywood
We specify and coordinate prefab and modular systems from Tuff Shed, James Hardie, Abodu, and Cover within our single-contract model, with parts and warranty support stocked locally in Los Angeles County. Most brand-specific consultations are scheduled within 48 hours of your initial call.
Pricing for ADU in West Hollywood, CA
| Service | Typical range in West Hollywood |
|---|---|
| Junior ADU & Interior Conversion | $75,000 - $175,000 |
| Basement ADU conversion | $95,000 - $175,000 |
| Room-to-ADU conversion | $75,000 - $140,000 |
| Above-garage ADU conversion | $85,000 - $155,000 |
| ADU Site Prep & Utilities | $15,000 - $45,000 |
| Electrical panel upgrade | $4,500 - $12,000 |
| Plumbing lateral replacement | $8,000 - $28,000 |
| Gas line extension | $3,500 - $9,000 |
Price in West Hollywood pushes higher when we encounter knob-and-tube wiring requiring full replacement, clay sewer laterals under existing concrete, or RSO compliance structures needing legal review. Under Haven Standard Clause 1, your written price is locked before any work begins; no change orders for conditions we should have found during survey.
Neighborhoods We Serve in West Hollywood
We work across West Hollywood’s full 1.9 square miles, from the Sunset Strip to Melrose. Our Los Angeles office dispatches crews who know WeHo’s streets and permit office. Response for initial surveys is typically 2-3 business days.
- Sunset Strip
- West Hollywood West
- Norma Triangle
- Spaulding Square
- Design District
Service Area - Cities Near West Hollywood
Our crews serve West Hollywood directly and coordinate projects in adjacent communities. We regularly work in Beverly Hills, CA to the west, Studio City, CA and Sherman Oaks, CA to the north, and North Hollywood, CA to the northeast. Each city has its own permitting authority and code interpretations; we adjust our permit sets accordingly.
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 About ADU in West Hollywood
West Hollywood’s Community Development Department typically takes 8-12 weeks for initial plan check on ADU submittals, longer if corrections are needed; we build this timeline into every project schedule and handle all resubmittals.
Yes, but the ADU must be structured to avoid triggering RSO relocation assistance and just-cause eviction rules; we review your parcel’s rental history during design and adjust ownership and tenancy structures accordingly.
West Hollywood has few formal HOAs compared to planned communities, but condominium associations and historic districts impose their own design review; we coordinate with those bodies and incorporate their requirements into the permit set before city submittal.
Call (424) 523-8492 to schedule your free estimate. Every project receives a written price before work starts, a documented photo record on every visit, and our 365-Day Done Right Promise backed in writing under The Haven Standard.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What West Hollywood Customers Say
"The rental income has covered the payment since the second month. They were realistic about the numbers rather than optimistic."
- Odette N."They walked us through setbacks and utility capacity before we paid anything, and told us one of our two options was not going to get approved."
- Mireille T."The permit set and the build were one contract with one number. Our neighbours used two firms and spent a year watching them blame each other."
- Helena V.