Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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After
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AfterFast, Reliable Home Additions & ADU Across Studio City
A full home addition or ADU in Studio City runs $45,000-$130,000 for a typical room addition, while new detached ADUs cost $90,000-$220,000 depending on hillside conditions and finish level. Those numbers only mean something when the price is locked in writing before the first nail moves, which is exactly how we work. Our crew knows the difference between a flat Ventura Boulevard lot and a cut-and-fill pad off Dilling Street, and that local knowledge changes what actually happens on your job. Call (877) 610-1318 and we’ll walk the site, price the real scope, and put it on paper.
Why Barrett & Sons Construction Is Studio City’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998 and his sons run the crews. That’s not marketing language, it’s how we show up: a name on the truck, a face at the job site, a phone number someone answers when you call. Studio City homeowners repeatedly tell us the same story: a national outfit quoted one number over the phone, then handed them a different bill when the plan checker red-lined the scope. We don’t work that way. Every price change here arrives as a written change order before the work happens, and our 90-Day Done Right Promise sits in the contract itself, not the fine print.
What matters most in Studio City is knowing the hillside. The neighborhoods north of Ventura Boulevard fall under the Very High Fire Hazard Severity Zone and Los Angeles’s Hillside Area Construction Regulations at the same time. That dual compliance burden changes what a Home Additions & ADU project costs, how long it takes, and what the city will and won’t approve. We’ve done the fire-hardening upgrades, the geotechnical reviews, and the retaining-wall work that flat-valley contractors never see coming. You’ll get a real price from people who know why it’s real.
Our Home Additions & ADU Services in Studio City
Second Story Additions
A second story on a Studio City hillside lot is a different animal than the same square footage in North Hollywood. The city will look at your existing foundation, your cut-and-fill pad, your retaining walls, and your exterior materials before it approves anything. We handle the geotechnical path from day one and price the fire-hardening package up front, so you’re not funding a surprise after the permit comes back. Expect $45,000-$130,000 for a typical addition in the 91604 and 91614 ZIP codes, with the hillside lots leaning toward the upper end.
ADU Design & Permitting
Studio City’s hillside neighborhoods routinely trigger a compliance review that flat-valley North Hollywood or Van Nuys never sees. A detached ADU on a steep lot often requires ignition-resistant vents, eaves, and siding even when the main house predates the fire-zone rules. We pull the permits, sit with the plan checker when the scope gets flagged, and bring you written allowances for every material so there’s no sticker shock at rough-in. This is the part of the job where cheap bids die.
New Detached ADU
New detached ADUs in Studio City run $90,000-$220,000. The spread is wide because a flat lot off Moorpark Street and a steep canyon lot near Mulholland Drive face completely different foundation, grading, and fire-compliance costs. Before you order anything, we confirm the soil conditions, the retaining-wall condition, and the exact VHFHSZ material mandates that apply to your parcel. Then we lock the price in writing.
Junior ADU & Interior Conversion
A junior ADU inside your existing footprint is the fastest path to a legal rental unit in Studio City, especially on the valley floor south of Ventura Boulevard. These conversions don’t usually trigger the same hillside grading reviews, but they still require plumbing, egress, and electrical work that LADBS will inspect. We bring the same written-change-order discipline to a $30,000 garage conversion as we do to a $220,000 hillside ADU.
Garage Conversion ADU
Converting a garage in Studio City runs $30,000-$80,000, and the range depends heavily on whether you’re on the flat side or the hill. Older 1940s and 1950s garages south of Ventura Boulevard often have foundation slabs that need reinforcement before they’ll pass inspection for living space. On the hillside, a garage conversion can still trigger fire-hardening reviews on the exterior shell. We tell you what’s required before the permit gets filed, not after the plan checker rejects it.
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 Studio City
For windows, doors, and exterior components on Studio City additions and ADUs, we carry brands you can verify: Simonton, Ply Gem, and PGT. These are spec-grade lines with published testing data, which matters when the city wants documentation that your new windows meet ignition-resistant standards under the hillside fire-zone rules. We keep common sizes and hardware on hand for 91604 and 91614 jobs, which means fewer waits when a lead time runs long. If you’re replacing windows on the existing house as part of a larger addition, say so at the estimate. We’ll fold it into one permit, not two.
Common Home Additions & ADU Problems We See in Studio City Homes
- VHFHSZ compliance flags after permit submittal. A hillside addition that starts as a simple second story gets red-lined by LADBS because the existing eaves, vents, or siding don’t meet ignition-resistant standards. The homeowner ends up paying for upgrades they never planned on. We price this risk before the permit goes in.
- Unstable cut-and-fill pads hidden under 60-year-old landscaping. Hillside lots off Dilling Street and other canyon roads often rest on compacted fill that looked fine in 1965 and is now settling. Adding an ADU without a geotechnical soil report will crack the foundation and fail the inspection sign-off.
- Flat-valley contractors quoting hillside work at flat-valley prices. The Hillside Area Construction Regulations add retaining-wall, grading, and fire-hardening requirements that a general contractor working mostly in North Hollywood or Van Nuys won’t factor in. The change order arrives after the plan checker red-lines the scope. Ask for the hillside experience before you sign.
- Older wiring and plumbing that complicates the rough-in. Many post-war ranch homes and 1940s bungalows along Ventura Boulevard still carry knob-and-tube wiring or galvanized plumbing that won’t pass current code. Any addition triggers a partial upgrade to the existing systems. We identify that before the job starts and include it in the written scope.
Pricing for Home Additions & ADU in Studio City, CA
Here’s the honest price picture for Studio City’s market, no phone-surprise bait. Hillside lots run higher because the city requires more from you.
| Project | Typical Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
What moves the number in Studio City? The hillside. A flat-lot addition south of Ventura Boulevard costs less because LADBS doesn’t require the same geotechnical review, retaining-wall sign-off, or ignition-resistant exterior upgrades. A second story off Dilling Street or a detached ADU near Mulholland triggers all three. Material selection also matters: architectural glass, rift-sawn white oak millwork, and premium window lines like PGT push the finish budget up. We’ll give you line-item allowances for every one of those choices, in writing, before you order anything. Call (877) 610-1318 and we’ll price your actual lot, not an average.
We Also Serve Cities Near Studio City
Our crews work throughout the San Fernando Valley and the adjacent hillside communities. If you’re in North Hollywood, Universal City, Sherman Oaks, or West Hollywood, the same crew that frames Hillside additions in Studio City will handle your project. If you’re on the Studio City side, Home Additions & ADU in Studio City is our focus. Call (877) 610-1318. One live person answers, every time.
Serving Studio City, CA - Our Local Coverage Area
We’re based in the Studio City 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 Studio City
Yes. When LADBS reviews an ADU permit on a hillside parcel in the Very High Fire Hazard Severity Zone, they evaluate the exterior of the entire structure that the ADU attaches to or sits near, not just the new construction. If your existing house has wood eaves, unprotected vents, or siding that doesn’t meet current ignition-resistant standards, the city will require upgrades to those components as a condition of the ADU permit. The requirement applies even if the house was built in 1965 and has never been flagged before. We price those upgrades in writing before the permit goes in so the mandatory scope doesn’t arrive as a surprise. Call (877) 610-1318 if you want us to check your parcel’s specific requirements.
Hillside lots in Studio City carry steeper setbacks and grading restrictions than flat lots, which shrinks the buildable footprint for a detached ADU. The Hillside Area Construction Regulations impose additional set-back distances from slopes and property lines, limit grading beyond a certain percentage, and require retaining-wall engineering for any pad that changes the existing grade. On a steep canyon lot north of Ventura Boulevard, a 1,200-square-foot ADU plan may need to drop to 800 square feet to stay within legal setbacks. We survey the actual parcel, check the grade, and verify the buildable envelope before you spend money on plans that won’t pass. Call (877) 610-1318 to schedule a free site review.
Yes, with a written scope and written allowances. We can’t know what the plan checker will require until the plans are submitted, which is why we price the known items up front and write every allowance in the contract. If LADBS requires upgraded vents, eaves, or siding on the existing house, that additional scope arrives as a written change order with a line-item price before we do the work. You’ll never open an invoice at the end and find a number we never discussed. That’s the whole point of how Tom Barrett runs this company. For a fixed-price proposal on your specific project, call (877) 610-1318.
Two reasons: geotechnical review and fire-hardening requirements. Every hillside addition in Studio City needs a soil report before the foundation plans are approved, and LADBS holds the permit until the geotech sign-off is complete. Then the fire-zone review adds another layer: ember-resistant vents, Class A roofing, and ignition-resistant siding all have to be specified, ordered, and installed before the final inspection. Flat-lot North Hollywood work skips both steps. The calendar on a hillside addition is set by the plan checker and the material lead times, not by labor. We tell you the real timeline at the estimate, and we don’t blame the city when it’s just physics plus paperwork. Call (877) 610-1318 for a timeline on your lot.
You get a written change order before we touch anything. If LADBS flags your existing eaves or vents during the plan review for an addition or ADU, we bring you the required upgrade as a line-item price with a clear scope. You approve it in writing, we order the materials, and the job continues without a surprise invoice at the end. This is exactly the situation that burns homeowners who hire a contractor that leaves allowances vague. An allowance that isn’t on paper is a surprise waiting for a date. Ours are on paper, always. Call (877) 610-1318 and we’ll show you what that looks like.
Schedule Your Free Estimate in Studio City
If you’re planning a second-story addition, a detached ADU, or a garage conversion in Studio City, start with a real conversation. Call (877) 610-1318 and Tom or one of his sons will walk your lot, talk through what the city will actually require, and put a written price in your hand. Free estimate, no trip charge inside the county, and the 90-Day Done Right Promise on every completed job. Senior and veteran discount: 10 percent off, permanent, no fine print. That’s how we’ve done it since 1998.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Studio City since 1998.