Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Before
After
Before
After
Before
AfterFast, Reliable Home Additions & ADU Across Studio City
A home addition or ADU in Studio City typically runs $45,000-$130,000 for room additions and $90,000-$220,000 for detached ADU construction, with garage conversions falling between $30,000-$80,000. Most of our Studio City projects are quoted within one business day of the site visit, and scheduling is coordinated from our Los Angeles office with crews serving the local area. Call (213) 221-0788 to set up your free estimate.
We’ve worked the hillside lots climbing toward Mulholland and the valley-floor ranches below Ventura Boulevard. The two zones don’t build the same. Studio City’s split personality - flat post-war ranchland against steep, brush-covered slopes - means the permitting path, foundation type, and even the materials list change block by block. Our Home Additions & ADU team prices both scenarios in writing before anyone orders a stick of lumber.
Why Rowan Construction Group Sherman Oaks Is Studio City’s Preferred Home Additions & ADU Company
We’ve delivered over 4,000 projects since 2007, every one with a written price before work started and a documented photo record when the crew left. That discipline matters more in Studio City than most places because the compliance layers here - Chapter 7A fire standards, LAMC §91.7013 hillside regulations, seismic retrofit triggers from the ’94 Northridge event - create opportunities for contractors to discover “surprise” costs mid-project. We don’t operate that way. Under Clause 1 of The Haven Standard, the price is written before anyone starts.
Studio City customers get the same standing offers: a 365-Day Done Right Promise backed by a terms page, not an asterisk; a Free Second Opinion on any competitor’s written estimate reviewed line by line; and a live person answering calls 24/7. Crews are background-checked, uniformed, and arrive with a documented photo record included as standard.
Dispatch and scheduling are coordinated from our Los Angeles office, with crews serving Studio City locally. We’re familiar with the LADBS Van Nuys district office where most Studio City permits route, and we’ve navigated the hillside plan check enough times to know when a geotechnical report will trigger and when it won’t.
Our Home Additions & ADU Services in Studio City
ADU Design & Permitting
ADU design and permitting in Studio City starts with zoning verification against the specific lot - R-1, RD, or R-2 under L.A. Municipal Code, plus hillside overlay if you’re above Ventura Boulevard. We handle the full plan set, Title 24 energy calculations, and structural calculations in-house, then route through LADBS. On hillside lots, we build the Chapter 7A ignition-resistant assembly package and the LAMC §91.7013 grading plan into the initial submission, not as afterthoughts. That front-loading is why our hillside permits clear in one cycle more often than not.
Garage Conversion ADU
Garage conversions in Studio City run $30,000-$80,000 depending on whether the existing slab and framing can carry the residential load. Many 1940s-1960s valley-floor garages have single-pour slabs without footings, which means a new foundation and moisture barrier. We assess this during the free estimate and write the scope accordingly. A garage conversion can stay as a full ADU or drop to a Junior ADU if you want to preserve the existing structure and avoid triggering full utility separations.
New Detached ADU
New detached ADUs are where Studio City’s hillside lots get interesting. We framed a detached ADU on an Iredell Lane lot where the geotech report pushed us off conventional footings and onto engineered grade beams stepped into the slope. Because we were inside the Very High Fire Hazard Severity Zone, the package went out with Class A roofing, ember-resistant soffit vents, and non-combustible siding detailed from the start, and our rough-in inspections were sequenced against a stamped grading plan that LADBS reviewed before we could close up the walls. Cambria counters and a KraftMaid kitchen - both locked in writing weeks earlier - landed on schedule only because the long-lead order went in ahead of the hillside permit sign-off. That’s how this tier of work actually runs: lead times, not labour, set the calendar.
Junior ADU & Interior Conversion
Junior ADUs, or JADUs, work inside the existing footprint - typically a converted bedroom or attached garage with a kitchenette and separate entrance, sharing utilities with the main house. In Studio City’s smaller Spanish-style bungalows below Ventura Boulevard, a JADU can add 500 square feet of rental-ready space without the full ADU utility-separation cost. We verify the existing electrical panel capacity and sewer line condition during the estimate, then write both into the scope.
Room Additions & Second Story Additions
Room additions on the valley floor are straightforward: match the foundation, extend the roofline, tie into existing mechanical. Second-story additions are where we see the most variation. The 1940s-1960s wood-frame ranch stock common south of Ventura Boulevard often needs seismic retrofit - Simpson Strong-Tie hardware, plywood shear panels, bolted sill plates - before a second floor can load the walls. We price that structural work in the original quote, not as a change order after demo. On hillside lots, a second-story addition may trigger the full LAMC §91.7013 sequence: soils report, grading plan, neighbor notification. We flag that during the first site visit and build the timeline around it.
ADU Site Prep & Utilities
Utility work for ADUs in Studio City varies by service age. Many hillside lots still run on original 1960s water laterals and sewer lines that won’t carry a second dwelling unit. We coordinate the sewer capacity verification and water-meter upgrade with LADWP and the Bureau of Sanitation, then write the cost into the flat price. Electrical service upgrades from 100-amp to 200-amp panels are common for detached ADUs and priced accordingly.
Sunrooms & Enclosed Patios
Sunroom additions in Studio City face the same thermal-cycling challenge as the rest of the structure: Santa Ana winds, rapid moisture shifts between valley heat and hillside cool, and the debris-flow risk that makes enclosed spaces more durable than open patios on slopes. We spec tempered glass, weep screed drainage at the slab edge, and flashing details that handle the wind-driven rain this area sees each fall.
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
AfterTrusted Brands We Service in Studio City
Our quotes pull from fifty-plus vetted brands, which lets us match spec to budget without inflating either. For Studio City additions and ADUs, we regularly source KraftMaid and Wellborn cabinetry, Cambria and Caesarstone countertops, and GAF or Owens Corning roofing where the slope and fire zone allow. On Very High Fire Hazard Severity Zone lots, we default to Class A-rated assemblies - IKO or Atlas shingles where composition is acceptable, or standing-seam metal where the design calls for it. We stock common trim and hardware locally for fast turnaround on warranty callbacks, but the long-lead items - custom cabinets, architectural glass, specialty finishes - are ordered against the signed contract, not the permit approval, to protect the schedule.
Common Home Additions & ADU Problems We See in Studio City Homes
- Treating Chapter 7A as an upgrade, not baseline. Builders from flat valley ZIPs spec standard vents and wood siding, then eat a redesign when LADBS rejects the plan for a Very High Fire Hazard Severity Zone lot. We detail ember-resistant assemblies from the first submission.
- Underestimating LAMC §91.7013 on hillside lots. The geotechnical soils report, grading plan check, and neighbor-notification requirements can stretch the permit runway four to eight weeks past a standard flat-lot timeline. We build that into our schedule and our price.
- Letting long-lead items float. Custom cabinetry, architectural glass, and specialty finishes ordered before the plan set is final mean a late change order resets the delivery window and stalls the draw schedule. We lock materials in writing before ordering, and no change proceeds without a signed change order.
- Ignoring seismic retrofit triggers on second-story additions. The wood-frame ranch stock south of Ventura Boulevard often lacks the lateral bracing for a second floor. We inspect for this during the estimate and price the hardware and shear panels into the original scope.
Pricing for Home Additions & ADU in Studio City, CA
Here’s what we see in the Studio City market for 2024-2025:
| Service | Typical Range in Studio City |
|---|---|
| Home Addition (room or bump-out) | $45,000-$130,000 |
| ADU Construction (new detached) | $90,000-$220,000 |
| Garage Conversion ADU | $30,000-$80,000 |
| Cabinet Installation (per project) | $4,000-$13,000 |
| Countertop Installation | $2,000-$6,500 |
Hillside lots above Ventura Boulevard - Fryman Road, Iredell Lane, the Wilacre Park edges - land at the higher end of these ranges due to engineered foundations, Chapter 7A assemblies, and the extended permitting sequence. Valley-floor ranches below Ventura typically run mid-range. The price you receive is flat, written, and includes the full scope, warranty, and documented photo record. No change proceeds without a signed change order, which is why our projects finish within a few percent of the number we agreed on. Call (213) 221-0788 for your free estimate.
We Also Serve Cities Near Studio City
Our crews work across the San Fernando Valley and adjacent areas. If you’re in Studio City or nearby - North Hollywood, Van Nuys, West Hollywood, or Sherman Oaks - we cover your permit district and building stock type. The same written-price discipline and Haven Standard protections apply.
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
Hillside lots in the Very High Fire Hazard Severity Zone must meet Chapter 7A ignition-resistant standards and LAMC §91.7013 hillside construction regulations, which add geotechnical review, grading plan checks, and neighbor notification - typically four to eight weeks beyond a flat-lot permit. The foundation also shifts from conventional footings to engineered grade beams or caissons. Call (213) 221-0788 and we’ll walk your specific lot conditions.
Yes, if the lot is in a hillside area regulated under LAMC §91.7013, which covers much of the terrain above Ventura Boulevard and around Mulholland Drive. The report determines bearing capacity and whether the existing foundation can carry the new load. We order this during pre-construction and build the cost into the written quote. Flat-lot second stories south of Ventura typically don’t trigger this requirement.
On custom Studio City additions, the crew can frame and dry-in faster than the custom cabinets, architectural glass, or specialty finishes can be manufactured and delivered. If those long-lead items aren’t ordered before permit sign-off, the job sits idle while materials ship. We fix the price in writing early, then place orders immediately so the schedule moves continuously. Call (213) 221-0788 to discuss timing on your project.
Yes, if the garage is attached or within the existing footprint and you don’t need full utility separation. A Junior ADU shares bathrooms and HVAC with the main house, which avoids the sewer and electrical upgrades that a full ADU requires. Many Studio City homeowners on 5,000-square-foot lots choose this path to preserve yard space and reduce construction cost.
Because once custom cabinets or architectural glass are ordered, the supplier locks the deposit and production slot. A late design change becomes expensive and schedule-breaking. Under Clause 1 of The Haven Standard, the price is written before work starts, and no change proceeds without a signed change order - so the long-lead order goes in once, correctly, and arrives when the crew is ready for it. Call (213) 221-0788 to schedule your free estimate.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Studio City since 2007.