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

Fast, Reliable Home Additions & ADU Across West Hollywood

Home additions and ADU construction in West Hollywood run $45,000-$130,000 for room additions and $90,000-$220,000 for detached units, with garage conversions typically falling between $30,000-$80,000. Every project here moves through West Hollywood’s own building department, not LADBS, and tight lots on streets like Palm Avenue or near Santa Monica Boulevard mean staging, parking permits, and neighbor coordination often shape the schedule as much as the build itself. Call (213) 221-0788 to schedule your free estimate - our Home Additions & ADU team coordinates dispatch from our Los Angeles office and serves West Hollywood with local crews who know the permit office on Sweetzer Avenue.

Call (213) 221-0788

Why Rowan Construction Group Sherman Oaks Is West Hollywood’s Preferred Home Additions & ADU Company

We’ve delivered written-price projects across West Hollywood since 2007, from garage conversions off Melrose Avenue to second-story additions near Doheny Drive. Our crews understand the difference between a permit submittal for the City of LA and one for WeHo’s independent building department - a distinction that has saved our customers weeks of intake delays.

West Hollywood customers find us through the same research process they use for appliances: they read the three-star reviews, compare line-item quotes, and want documentation before they commit. We answer with a flat written price, a written scope, and a documented photo record on every visit - standard, not optional. Under Clause 1 of The Haven Standard, that written price arrives before any work starts, every time.

Calls are answered by a live person 24/7, and our background-checked, uniformed technicians arrive with the permit knowledge specific to WeHo’s jurisdiction. Response time to West Hollywood is typically same-week for estimates, with project scheduling built around the city’s inspection calendar and your neighbor’s work-hour constraints.

Our Home Additions & ADU Services in West Hollywood

New Detached ADU

A detached ADU on a West Hollywood lot means solving for space before solving for square footage. Many parcels south of Santa Monica Boulevard measure under 6,000 square feet, so we design for vertical efficiency and minimal setback intrusion. Our team takes the initial survey, produces permit drawings to WeHo’s submittal standards, and coordinates utility tie-ins that don’t disrupt the main residence. On a tight lot off Palm Avenue, our crew built a detached ADU behind a 1950s Streamline Moderne fourplex, and the real work was logistics: we staged materials in a driveway apron, took two separate short-term parking permits so the dumpster and the crane never shared the street on the same day, and served party-wall notice on the shared-wall neighbor before we touched the load-bearing line. When we opened the wall and found original knob-and-tube wiring and a balloon-frame cavity, we wrote the change order before any rough-in resumed, and the inspection sign-off cleared on the first pass because the permit drawings matched what the inspector actually saw.

Garage Conversion ADU

Garage conversions are the most common ADU type we quote in West Hollywood, particularly in the Norma Triangle and Spaulding Square areas where detached garages sit at the rear of narrow lots. The existing slab, roof structure, and setback compliance are evaluated against WeHo’s ADU ordinance before we price. A typical garage conversion ADU in West Hollywood runs $30,000-$80,000 depending on whether the foundation needs reinforcement, the roof needs re-framing for insulation, and the utility trench to the main house crosses a driveway or an alley. We pull the permit through the city’s building department and schedule inspections to the city’s rhythm, not LA County’s.

Room Additions

Room additions in West Hollywood often mean building up rather than out. Second-story additions above existing single-story units are common north of Sunset Boulevard, where the original 1920s-1950s bungalows sit on shallow lots with no rear yard to expand into. These projects require structural analysis of the existing foundation and framing, plus careful staging to protect the occupied residence below. We document the existing conditions with photos before demolition, submit to WeHo’s plan check with structural calcs included, and never proceed past rough-in without a signed change order if hidden conditions demand scope revision.

Junior ADU & Interior Conversion

A Junior ADU - an interior conversion within the existing footprint of a single-family home - offers a lower-cost entry point at $45,000-$90,000 in most West Hollywood cases. These conversions require separate exterior access and a small kitchenette, which in WeHo’s older housing stock often means reworking the original floor plan around load-bearing walls that weren’t designed for openness. We evaluate the bearing wall layout, the electrical service capacity, and the sewer line routing before we quote, so the written price reflects the actual work rather than a placeholder that balloons at change order.

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Trusted Brands We Service in West Hollywood

Our sourcing depth across fifty-plus vetted brands means the written quote contains honest numbers rather than inflated ones. For ADU and addition roofing in West Hollywood’s high-UV environment, we specify IKO or Atlas shingles with enhanced granule retention, or Tamko’s reflective options where the near-absence of mature tree canopy accelerates thermal degradation. For exterior finishes on additions that must match existing Spanish Colonial Revival or Streamline Moderne facades, we source Boral’s clay and concrete products to maintain the streetscape character that WeHo’s design review prioritizes. These brands are stocked through our Los Angeles-area suppliers with turnaround that keeps tight-lot projects on schedule.

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

• Permit rejection at WeHo intake for LADBS-formatted plans. West Hollywood’s building department uses different submittal requirements, sheet numbering, and narrative formats than the City of LA. A plan set prepared for LA County can be rejected before review even begins, costing two to four weeks. We prepare to WeHo’s standard from the first submittal.
• Hidden knob-and-tube or early Romex wiring in opened walls. West Hollywood’s 1920s-1960s wood-frame housing stock routinely contains original electrical systems that don’t meet current code. Discovering this after rough-in has started forces emergency change orders and inspection re-scheduling. We probe and document before demolition whenever possible.
• RSO ‘substantial rehabilitation’ threshold exposure on multi-unit properties. Exceeding the cost threshold defined in West Hollywood’s Rent Stabilization Ordinance can reclassify a rent-controlled building and expose the owner to tenant legal action, potentially halting the project mid-permit. We stage and document multi-unit scopes to keep the math clear.
• UV-accelerated exterior finish degradation on south- and west-facing additions. West Hollywood’s flat basin location and sparse tree canopy mean sustained summer sun exposure that degrades roofing and siding faster than in shadier hillside neighborhoods. We specify materials rated for the exposure and document the warranty terms in writing.

Pricing for Home Additions & ADU in West Hollywood, CA

We Also Serve Cities Near West Hollywood

Our crews work across the metro core, including Home Additions & ADU in West Hollywood and neighboring Beverly Hills, Studio City, North Hollywood, and Sherman Oaks. Each city carries its own permit jurisdiction and housing stock, and we adjust our submittals and staging plans accordingly.

FAQs - Home Additions & ADU in West Hollywood