Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across West Hollywood
Home additions and ADU construction in West Hollywood typically run $45,000-$130,000 for a room addition, $90,000-$220,000 for a new detached ADU, and $30,000-$80,000 for a garage conversion. Those numbers assume something most out-of-town contractors miss completely: West Hollywood is its own city with its own building department, its own inspectors, and a Rent Stabilization Ordinance that changes what you’re allowed to do on any property with tenants. Barrett & Sons has worked these streets long enough to know the difference between filing with WeHo and filing with LADBS, and it’s a difference that costs people weeks and thousands when they get it wrong. Call (877) 610-1318 if you’re planning an addition or ADU here; we’ll walk you through what actually applies to your property before you spend a dollar on plans.
Why Barrett & Sons Construction Is West Hollywood’s Preferred Home Additions & ADU Company
We’re an owner-operated company, not a franchise. Tom Barrett started this business in 1998, and his sons run the crews. When you call about a Home Additions & ADU project in West Hollywood, you’re talking to someone who has pulled permits through the city’s own plan-check queue, waited on its inspectors, and navigated its tenant-habitability rules. That’s not something you learn from a YouTube video.
West Hollywood is dense. Shared walls, tuck-under parking, courtyard bungalows packed shoulder to shoulder. That means staging matters, neighbor notification matters, and the site constraints are real. Our crews show up knowing they’ll be parking a truck on a street where space is at a premium and working during hours the city actually allows. We coordinate with building management, we keep the site clean at the end of every day, and we don’t surprise the neighbor whose wall we’re about to touch.
Tom publishes his name, his address, and his license number. We issue written change orders before any scope change touches the job, and we back every completed project with the written 90-Day Done Right Promise - if something isn’t right, one call brings Tom back. Ask anyone on your street, or look up the license number yourself.
Our Home Additions & ADU Services in West Hollywood
Most of what we do in West Hollywood falls into a few categories, and each one has its own set of local rules. Here’s how we approach them.
ADU Design & Permitting
West Hollywood runs its own permitting process, separate from LADBS. A contractor who files your ADU plans with the wrong department loses two or three weeks before the mistake gets caught. We’ve pulled enough permits through WeHo’s plan-check queue to know what its reviewers flag, what they wave through, and how to sequence submittals so you’re not paying for resubmittal fees. On top of that, any ADU on a property with rent-controlled tenants triggers the city’s Rent Stabilization Ordinance rules for tenant habitability during construction. We handle the notices, the tenant-protection plan, and the inspections that flow from it.
Garage Conversion ADU
West Hollywood has one of the densest stocks of 1950s and 1960s dingbat apartments in California, most of them with tuck-under parking garages. Those garages are prime ADU candidates, but they’re also structurally tied into the building above. Removing a load-bearing post without proper shoring can crack the stucco, and if the building is subject to the city’s mandatory soft-story retrofit ordinance, you’re now working inside a structure with seismic constraints. We’ve done these conversions off Harper Avenue, off Hayworth, off Poinsettia. We know what the inspector is going to ask before he asks it.
New Detached ADU
Detached ADUs are less common in West Hollywood simply because yards are small. When there’s room, the work is straightforward, but the lot coverage rules, setback requirements, and soils conditions still apply. The northern hillside-adjacent lots sit on expansive clay that shrinks in the dry summer months and heaves when winter rains return. That cycle cracks slabs and retaining walls over time, which is why the city routinely requires soils engineering on any ground-disturbing permit in those areas. We factor that into the quote up front instead of discovering it halfway through.
Junior ADU & Interior Conversion
For a lot of West Hollywood property owners, the smartest move is converting existing interior space rather than building new. A junior ADU carved out of a storage room, a laundry room, or part of a larger unit. These projects avoid a lot of the site logistics that make full additions slow here, but they don’t avoid the tenant rules. On a 1920s courtyard bungalow off Harper Avenue in 90069, our crew converted an interior storage room into a junior ADU while a rent-controlled tenant remained in the adjacent unit. We pulled a separate West Hollywood plan-check queue permit, scheduled rough-in inspections around the tenant’s quiet hours, and used a HEPA dust extractor at the shared wall to keep the occupied unit livable through final inspection sign-off.
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 install windows and doors from Simonton, Ply Gem, and PGT on our West Hollywood addition and ADU projects. These are brands you can look up, not mystery product off a van. When a window or door needs a matching replacement part down the road, we can get it. For a city with this many stucco buildings and this much direct afternoon sun on the south-facing walls, glazing choice actually matters for the lifespan of the unit and the comfort of the room. We carry what works here.
Common Home Additions & ADU Problems We See in West Hollywood Homes
- Plans filed with LADBS instead of West Hollywood’s own building department. This is the most common mistake we see from out-of-town or LA-based contractors who assume every address in the basin files the same way. It costs weeks and re-submittal fees. West Hollywood is its own permitting universe.
- Rent Stabilization Ordinance notice requirements missed. If your dingbat apartment has rent-controlled tenants and you start construction without the proper tenant notices in place, the city will stop the job. We file those notices before we ever bring a tool on site.
- Tuck-under parking garage conversions gone wrong. Load-bearing posts in these garages are frequently removed without shoring to create headroom or open floor space. The result is cracked stucco above and a soft-story retrofit violation. The fix costs more than doing it right the first time.
- Expansive clay movement on hillside-adjacent northern lots. From roughly May through September, West Hollywood gets almost no rainfall, and the clay soils on those northern lots shrink and crack. Winter rains make them heave. Any slab work or retaining wall project in those areas needs a soils report, and the city will ask for one.
Pricing for Home Additions & ADU in West Hollywood, CA
Here’s what you should expect to pay in West Hollywood right now. These are local market ranges, not generic national numbers.
| Project Type | Typical Range |
|---|---|
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
| Home Addition | $45,000-$130,000 |
What moves these numbers more than anything in West Hollywood is site access and the condition of the existing structure. A garage conversion in a dingbat building with tuck-under parking is going to cost more than the same conversion on a flat lot with easy access, because you’re shoring load-bearing posts, managing a soft-story retrofit condition, and working around tenants. Every quote we give is a line-item scope in writing. Every allowance is on paper. Every change order arrives as a written document before work proceeds. If the number changes, you’ll see why in writing first. Call (877) 610-1318 for a free estimate, and we’ll walk the property with you before we put any number in front of you.
We Also Serve Cities Near West Hollywood
We work throughout the surrounding area, including Beverly Hills, Century City, Hollywood, and Universal City. If you’re just over the line from West Hollywood, or if you own property in West Hollywood but live elsewhere, we’re happy to schedule a walk-through at your convenience. Our scheduling is coordinated from the Los Angeles office, and our crews serve West Hollywood locally.
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 - Home Additions & ADU in West Hollywood
Yes, in most cases. The expansive clay soils common on West Hollywood’s northern hillside-adjacent lots shrink and crack during the dry months and heave when winter rains return, and the city’s building department routinely requires a soils engineering report before approving ground-disturbing work or significant vertical additions in those areas. If your lot is on the hillside side of the city, plan for the report cost and schedule time in your permit timeline. Call (877) 610-1318 and we’ll tell you whether your specific parcel is likely to trigger it.
Yes, but the soft-story retrofit mandate changes the engineering. Tuck-under parking garages in West Hollywood’s 1950s and 1960s dingbat apartments sit below occupied units, so any structural modification, including post removal or wall penetration, must account for the seismic retrofitting requirements the city has imposed on those buildings. Removing a load-bearing post without shoring is exactly how you crack the stucco above and earn a stop-work order. We handle these conversions and we coordinate with the city’s retrofit program requirements from the start. Call (877) 610-1318 to have us look at your garage and building plans.
The Rent Stabilization Ordinance, or RSO, requires tenant notices, habitability protections, and specific construction protocols whenever work is done on a property with rent-controlled tenants. That includes ADUs, interior conversions, and additions that touch shared walls, utilities, or access routes. Miss the notice requirement and the city issues a stop-work order. We file the required tenant notices before work begins and we schedule noisy work around tenant quiet hours. Call (877) 610-1318 if you have tenants and want to understand what applies to your building.
West Hollywood enforces its own construction noise ordinance, which typically restricts noisy work to daytime weekday hours, with stricter limits on weekends and holidays. The city also requires neighbor notification for certain scopes. Because the city is dense, with shared walls and tight setbacks, these restrictions affect scheduling more than they do in single-family neighborhoods. We build them into our timeline from day one. Call (877) 610-1318 for a schedule that respects the city’s rules and your tenants’ and neighbors’ sanity.
Because West Hollywood is an independent city with its own plan-check queue, its own reviewers, and its own inspectors. There’s no shared staffing with LADBS. A contractor who files with LADBS by mistake loses weeks before the error is caught, and then starts over in the WeHo queue. The city also enforces RSO tenant rules and soft-story retrofit mandates that LADBS doesn’t, which adds review steps. If you want a realistic timeline for your specific project, call (877) 610-1318. We’ll tell you what to expect based on what we’ve actually pulled through this city’s process recently.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving West Hollywood since 1998.