Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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After
Before
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Before
AfterFast, Reliable Home Additions & ADU Across Studio City
Home additions and ADU construction in Studio City 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 familiar with the split terrain here - flatland ranches south of Ventura Boulevard and hillside homes climbing toward Mulholland - and we dispatch crews from our Los Angeles office with schedules built around Studio City’s LADBS plan-check timelines. Call (213) 652-7670 to schedule your free estimate.
Why Rowan Construction Group Los Angeles Is Studio City’s Preferred Home Additions & ADU Company
We’ve delivered written quotes on over 4,000 projects since 2007, and a growing share of them sit inside Studio City’s 91604 and 91607 zip codes. Homeowners here research contractors the way they research appliances - they read the three-star reviews, they want the price range on the page, and they expect a text confirmation after the call. We built our process for exactly that customer.
Our crews know the local conditions: the 1940s-1960s ranch stock near CBS Studio Center with its post-Northridge retrofit history, the hillside post-and-beam homes with aging caisson foundations on expansive clay, and the Very High Fire Hazard Severity Zone that triggers Chapter 7A compliance on substantial improvements. That local knowledge keeps plan-check cycles shorter and change orders smaller.
A live person answers our phones 24/7. Every visit produces a documented photo record, included as standard. And under Clause 1 of The Haven Standard, the price is written before anyone picks up a tool - every time, on every trade.
Our Home Additions & ADU Services in Studio City
ADU Design & Permitting
Studio City’s ADU pipeline moves through LADBS with specific local wrinkles: hillside parcels in the fire zone need Chapter 7A detailing from the first submission, and flatland garages near Ventura Boulevard often trigger sewer lateral or utility-upgrade requirements that out-of-area designers miss. We handle the full design-build permit package, including site plans, structural calcs, and fire-hardened specifications where required. A typical detached ADU in Studio City runs $90,000-$220,000; garage conversions start at $30,000-$80,000.
Garage Conversion ADU
The flatlands around CBS Studio Center hold hundreds of detached and attached garages from the 1950s and 1960s, many with original slab-on-grade construction, cloth or aluminum wiring, and no insulation. We opened up a 1952 ranch near CBS Studio Center for a garage-conversion ADU and found the 1994 post-Northridge retrofit had left original undersized framing in the load-bearing wall, plus cloth wiring and a failed subfloor over the slab. We pulled permits with LADBS, wrote allowances for the fire-hardened detailing and electrical rough-in into the contract, and priced the framing repair as a written change order before our crew touched another stud - so the owner approved every dollar before demo continued. That’s the discipline Haven acquired Rowan for.
New Detached ADU
Studio City lots south of Ventura Boulevard often have the setback and coverage room for a standalone unit, but hillside lots above Fryman Canyon face grade, access, and foundation challenges that flatland contractors underestimate. Our quotes include geotechnical review where the slope exceeds 15%, caisson-condition assessment for tie-ins, and explicit allowances for utility trenching across steep grades. We source from fifty-plus vetted brands - including prefab partners like Abodu and Cover when the timeline demands it - so the written quote reflects honest material costs, not inflated placeholders.
Junior ADU & Interior Conversion
A Junior ADU converts existing interior space - typically a master suite or attached wing - into a self-contained unit with its own entrance and kitchenette. In Studio City’s older ranch stock, these conversions almost always expose outdated wiring, inadequate fire separation, and subfloors that won’t carry the added plumbing load. We inspect before we quote, write allowances for the predictable surprises, and price any additional scope in writing before work proceeds. No change moves forward without a signed change order.
Second Story Additions
Second-story additions in Studio City face two distinct challenges depending on geography. Flatland ranches often need foundation reinforcement to carry the new load - we assess the existing footing depth and soil bearing capacity during our initial inspection. Hillside homes require structural tie-in to caisson systems that may have shifted on expansive clay, plus full Chapter 7A compliance if the improvement crosses LA’s substantial-improvement threshold. We price both scenarios explicitly, with line-item allowances for foundation work and fire-hardened detailing.
What happens when you call
- 1
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.
Before
AfterTrusted Brands We Service in Studio City
Our sourcing depth covers fifty-plus vetted brands, which means the numbers in your written quote are grounded in actual supplier pricing rather than inflated estimates. For ADU and addition work in Studio City, we regularly specify KraftMaid and Wellborn cabinetry, Cambria and Caesarstone countertops, Kohler and Toto fixtures, and GAF or Owens Corning roofing where fire-rated assemblies are required. We also partner with prefab ADU manufacturers including Abodu, Cover, and Dvele when the project timeline or site access favors modular delivery. Local supplier relationships keep material lead times predictable, and our crews carry common repair stock for service calls that don’t wait on shipping.
Common Home Additions & ADU Problems We See in Studio City Homes
- Substantial-improvement fire triggers on hillside homes. Out-of-area contractors bid only the addition and miss LA’s substantial-improvement trigger, so the owner gets a mid-project LADBS plan-check correction letter demanding full Chapter 7A vents, eaves, and roofing across the existing hillside home. We flag this in our initial inspection and price the compliance scope upfront.
- Hidden electrical and framing defects in opened walls. Walls open on a 1940s-60s flatland ranch and reveal cloth or aluminum wiring, undersized load-bearing framing, and a failed subfloor that no pre-bid visual walkthrough could catch - a scope-of-work bomb if allowances aren’t written in. Our contracts include explicit line items for these conditions.
- Caisson movement and thermal cycling damage on hillsides. Hillside caisson foundations and exposed timber decks on expansive clay move under San Fernando Valley thermal cycling, so addition tie-ins that ignore the caisson condition crack stucco and flat roofing within a season. We assess caisson condition before finalizing structural connections.
- Utility capacity limits on converted garages. Many Studio City garages lack the electrical service, sewer lateral capacity, or gas line sizing to support a full ADU. Our permitting package includes utility-upgrade coordination with LADWP and DWP, priced as a separate line item when required.
Pricing for Home Additions & ADU in Studio City, CA
We put the number in writing before anyone picks up a tool. Below are the ranges we see in the current Studio City market, based on projects quoted and delivered across the 91604 and 91607 zip codes:
| Service | Price Range in Studio City |
|---|---|
| Home Addition (room or wing) | $45,000-$130,000 |
| ADU Construction (new detached) | $90,000-$220,000 |
| Garage Conversion ADU | $30,000-$80,000 |
| Impact Window Installation (fire-zone upgrade) | $8,000-$25,000 |
What moves the number: hillside versus flatland site conditions, Chapter 7A fire-hardening requirements, foundation type and condition, utility upgrade needs, and finish level. Our quotes are flat prices with written scope - not estimates that balloon. Every allowance is named, every contingency is capped, and no change proceeds without a signed change order. That’s how we’ve kept projects within a few percent of the agreed price across 4,000-plus jobs. Call (213) 652-7670 for your free written estimate.
We Also Serve Cities Near Studio City
Our Home Additions & ADU crews work throughout the San Fernando Valley and adjacent LA Basin communities, including Studio City and the surrounding cities of North Hollywood, Van Nuys, West Hollywood, and Sherman Oaks. Each market has its own permit timelines, soil conditions, and code triggers; we calibrate our quotes and schedules accordingly.
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, if the project crosses LA’s substantial-improvement threshold - typically 50% of the structure’s assessed value over a ten-year period - the entire existing building must meet current Chapter 7A standards for ember-resistant vents, ignition-resistant framing, and non-combustible eaves, not just the new square footage. We assess your improvement history and flag this trigger during our initial inspection, then price the full compliance scope in the original quote so you’re not facing a mid-project plan-check correction. Call (213) 652-7670 for a free estimate that includes fire-zone analysis.
The most common surprises are cloth or aluminum wiring, undersized load-bearing framing left from partial retrofits, and failed subfloors over original slab construction that won’t carry the added plumbing and tile loads. No visual walkthrough can catch these conditions, which is why we write explicit allowances into every garage-conversion contract and price any additional scope as a written change order before demo continues. Call (213) 652-7670 to schedule an inspection and written quote.
Yes, every ADU in Studio City requires LADBS permits, and the stakes are higher here than in many LA markets because hillside fire-zone compliance and utility-upgrade requirements are frequently triggered. Unpermitted ADUs face stop-work orders, fines, and mandatory disclosure issues on resale; more critically, an unpermitted hillside structure without Chapter 7A detailing creates serious liability exposure in a fire event. We pull all permits, coordinate inspections, and deliver signed-off occupancy documentation. Call (213) 652-7670 to discuss your specific site.
We inspect before we quote, write named allowances for the conditions we know are probable in 1940s-1970s Studio City stock, and cap contingencies at a fixed percentage. If we open a wall and find cloth wiring or failed subfloor, the repair is already priced in the allowance line; if we find something truly unexpected, we stop work, document with photos, and present a written change order for your signature before proceeding. No work moves forward on a change until the change order is signed - that’s Clause 1 discipline, and it’s why our projects finish within a few percent of the original number. Call (213) 652-7670 for a written quote with explicit allowances.
Yes, we manage the full construction-draw schedule tied to LADBS inspection milestones, including geotechnical observation of caisson work, foundation bolting sign-off, and final occupancy. Hillside ADUs with caisson foundations require staged releases - typically at foundation completion, rough framing, mechanical/electrical/plumbing rough, and final - and we coordinate lender inspections and city inspections on parallel tracks to avoid delays. Our photo documentation at every stage gives you and your lender clear evidence of progress. Call (213) 652-7670 to review draw-schedule management for your project.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Studio City since 2007.