Home Additions & ADU in West Hollywood - Plans, Permits & Build, One Fixed Price

Fast, Reliable Home Additions & ADU Across West Hollywood

Home additions and ADU construction in West Hollywood typically run $45,000-$130,000 for room additions and $90,000-$220,000 for detached ADUs, with most projects requiring 4-8 months from permit to final inspection. We’re Rowan Construction Group, and our crews work West Hollywood regularly - from the 1920s Spanish Colonial courtyards along Fountain Avenue to the 1960s dingbats tucked under parking near Havenhurst Drive. Dispatch and scheduling are coordinated from our Los Angeles office, but the trucks that roll to WeHo know the local haul routes, the Building & Safety inspection schedule, and where to legally stage when your lot has zero on-site parking. Call (213) 652-7670 to schedule your free estimate.

Call (213) 652-7670

Why Rowan Construction Group Los Angeles Is West Hollywood’s Preferred Home Additions & ADU Company

We’ve delivered 4,000-plus projects since 2007, every one with a written price before work started and a documented photo record when the crew left. In West Hollywood specifically, that discipline matters more than most places - this city is its own permitting jurisdiction, not LA City, and the inspectors here know the local stock of aging wood-frame and unreinforced masonry buildings intimately.

Our West Hollywood customers leave reviews that mention the same things: the written quote arrived fast, the change order was signed before the work changed, and the photo record showed exactly what was behind the wall. We don’t chase stars; we chase documentation that holds up when you sell, refinance, or file an insurance claim.

Response time to West Hollywood runs same-day for initial site visits because our crews are already working the corridor between Beverly Hills and Studio City. We know which WeHo lots trigger hillside geotechnical review, which blocks have rent-stabilized tenants requiring relocation lead time, and how to route a concrete truck through 1.9 square miles of dense residential without blocking a fire lane.

Local knowledge that builds trust: we’ve passed enough WeHo framing inspections to know the inspector will check roof diaphragm nailing patterns on any second-story addition over a dingbat. We build that compliance into the first quote, not the first re-inspection.

Our Home Additions & ADU Services in West Hollywood

ADU Design & Permitting

West Hollywood’s ADU design and permitting process is shaped by two hard realities - the city is almost fully built out at 2.19 square miles, and it’s an independent jurisdiction with its own Building & Safety division. Our Home Additions & ADU team prepares site plans that account for WeHo’s parking replacement requirements, utility capacity in aging multifamily districts, and the geotechnical review triggered by northern-edge lots backing toward the Hollywood Hills. We pull permits only after the scope is written, priced, and signed - Clause 1 of The Haven Standard.

Garage Conversion ADU

Garage conversions in West Hollywood run $30,000-$80,000 and face a specific local constraint: many WeHo garages are part of 1960s dingbat structures where the load path runs through the same post-and-beam bay you’re trying to convert. We assess the existing framing, shear walls, and utility routing before quoting. A garage conversion ADU here also requires compliance with the city’s rent stabilization oversight if the main structure is occupied multifamily - we build that administrative lead time into the project schedule from day one.

New Detached ADU

New detached ADUs in West Hollywood start around $90,000 and climb past $200,000 for units with full kitchens, baths, and utility tie-ins. The challenge is staging: with no legal on-site parking for crew trucks on most WeHo lots, we coordinate material delivery in tight windows and secure off-street staging permits where possible. Northern parcels near the Hollywood Hills slope face additional geotechnical review for any ground disturbance - we include that cost in the written quote, not as a surprise after excavation starts.

Junior ADU & Interior Conversion

Junior ADUs - units created within the existing footprint, often with a separate entrance added - work well in West Hollywood’s pre-1980 multifamily stock where full detached construction isn’t feasible. We evaluate ceiling heights, egress window requirements, and the existing electrical panel capacity before pricing. In rent-stabilized buildings, even interior conversions can trigger tenant relocation obligations; we identify that exposure during the free estimate and price the legal compliance, not just the carpentry.

Second Story Additions

Second story additions are among the most complex projects we handle in West Hollywood. The 1960s dingbats near Havenhurst Drive and similar corridors were never framed for vertical loads above the original single story. We opened one such project and found dry rot in beam pockets plus undersized blocking - we added a shear-load path and issued a signed change order before the rough-in inspection. The WeHo inspector signed off on the roof diaphragm nailing, and the draw schedule stayed intact. That’s the discipline Haven acquired Rowan for.

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Trusted Brands We Service in West Hollywood

Our sourcing depth runs across fifty-plus vetted brands, and we specify them by name in every written quote - KraftMaid and Wellborn cabinets, Cambria and Caesarstone countertops, Kohler and Toto fixtures. For ADU and addition work in West Hollywood, we also work with prefabricated unit manufacturers including Abodu, Cover, and Mighty Buildings, whose panelized or modular systems can reduce on-site staging time when your lot has no room for a months-long stick-build operation. We stock or source local parts for fast turnaround, and every brand is priced into the quote with model numbers attached - no allowances that balloon later.

Common Home Additions & ADU Problems We See in West Hollywood Homes

• Geotechnical surprises on northern-edge lots. Parcels along the Hollywood Hills slope face hillside grading and retaining wall requirements that flat Basin cities don’t - permitting triggers additional geotechnical review through WeHo’s own Building & Safety division. A cheap bid leaves this out, and the first inspection stalls while the excavator sits idle on a street with no legal staging.
• Undersized framing in 1960s dingbats. The tuck-under parking structures that dominate WeHo’s residential landscape often carry the main load through skinny post-and-beam bays with dry rot or inadequate blocking. We find it during pre-construction investigation, not during the inspector’s visit.
• Rent stabilization compliance gaps. WeHo’s ordinance is among California’s strongest. Contractors unfamiliar with it price only the structural scope and ignore tenant relocation obligations on occupied multifamily buildings. The result: city oversight, blown draw schedules, and a project that costs more than the written quote.
• Missing documentation for insurance. A low quote assumes a builder’s-risk-only approach and skips documented shear, uplift, and diaphragm-nailing compliance. When the insurance carrier asks for proof at claim or renewal time, the homeowner has no paper trail. We include the documentation as standard - every photo, every inspection sign-off, every spec sheet.

Pricing for Home Additions & ADU in West Hollywood, CA

We Also Serve Cities Near West Hollywood

Our crews work the full corridor: Beverly Hills to the west, Studio City and Sherman Oaks to the valley side, North Hollywood for larger-lot ADU projects where staging is less constrained. Each city carries its own permitting jurisdiction and its own code wrinkles - we price them accurately, not generically.

FAQs - Home Additions & ADU in West Hollywood