A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Room Addition Contractor Across Sherman Oaks
A room addition in Sherman Oaks typically costs between $180,000 and $420,000 depending on size, site access, and whether your existing electrical service can handle the new load. Most additions we price in the flat, post-war ranch tracts between Ventura Boulevard and the 101 take four to seven months from contract to final inspection. If you’re planning an in-law suite off the back of a 1950s ranch or converting garage space into living area, call (903) 568-7222 and we’ll give you a written price before any work starts. That’s not a verbal ballpark. It’s a line-item number you can hold us to.
We work throughout Sherman Oaks, from the tree-lined streets south of Ventura Boulevard up to the hillside lots near Mulholland Drive. Our crews know the difference between a 100-amp panel on a Magnolia Avenue original and a 200-amp service someone added during a 1990s remodel. That’s the kind of local detail that keeps a project on schedule instead of stalling at rough-in.
Why Benson ADU Builders Is Sherman Oaks’s Preferred Room Addition Contractor Company
Sherman Oaks homeowners tend to ask the same three questions before they’ll even look at a design: what’s the real price, who’s actually showing up, and what happens if something’s wrong a year later. We answer all three in writing. Every Sherman Oaks project gets a contract with a fixed price, a timeline, and the 365-Day Done Right Promise stamped on it from your Sherman Oaks Home Addition Contractor. If the work isn’t right within a full year, we make it right. You don’t chase us. We come back.
Our Room Addition Contractor team shows up in uniform, background-checked, and on a schedule you can see. The owner, Troy Eastman, reviews every Sherman Oaks proposal personally before it goes out. That’s not a corporate layer. It’s the person responsible for the final sign-off looking at your numbers before you do. And when you call, a live person answers. Around the clock. No phone tag, no “we’ll get back to you Monday.”
We also build with brands you can research yourself: Cover, Dvele, and Mighty Buildings for prefab ADU options, plus James Hardie cladding when the addition needs to blend with existing stucco or lap siding. You’re not stuck with whatever product our supplier happens to stock that month. You get curated choices with real prices attached.
If you’re adding space anywhere in Sherman Oaks and want an honest scope and price, call (903) 568-7222. Estimates are free, and they’re always written.
In Law Suite Builders in Sherman Oaks
In Law Suite Builders in Sherman Oaks work on a specific housing type: the single-story ranch with a deep rear yard and a low-pitch roof. That’s most of the housing stock south of Burbank Boulevard and east of the 405. An in-law suite here usually means a 450 to 600 square foot addition with a bedroom, a full or three-quarter bath, and a kitchenette. Sometimes it’s a separate entrance off the side yard. Sometimes it’s integrated with the main house.
Plan on $220,000 to $360,000 for a finished, permitted in-law suite in Sherman Oaks. The biggest cost driver most homeowners miss isn’t framing or drywall. It’s the electrical service. Many original Sherman Oaks ranches still run on 100-amp panels. Add a kitchenette with a cooktop and an electric dryer, and you’ve exceeded what that panel can safely feed. That means a service upgrade to 200 amps, which adds $4,000 to $7,000 before you even move the first wall.
Separate Entrance and Kitchenette Logic
A separate entrance changes how the suite functions. It lets an older family member come and go without walking through the main living space. It also changes the permit path, because LADBS may classify the space as a new dwelling unit rather than a simple addition. We plan for that from day one, not at final inspection.
Panel Capacity and HVAC Reality
Your existing HVAC was sized for the original floor plan. Adding 500 square feet with its own windows and heat load means a new zone or a separate mini-split. Factor $7,000 to $12,000 for that. We flag it in the written proposal, because finding out at rough-in is expensive.
ADU Conversion in Sherman Oaks
ADU Conversion in Sherman Oaks usually means converting an existing detached garage into a legal dwelling unit, or converting part of the main house into a separate JADU. Sherman Oaks has a lot of detached garages on alleys and rear-loading lots, especially in the flats near Dickens Street and Cedros Avenue. Converting one is often faster and cheaper than building new, because the foundation, walls, and roof already exist.
But “already exists” doesn’t mean “done.” Most Sherman Oaks detached garages were built as garages. The slab likely isn’t insulated to residential standards. The walls may not have proper moisture barriers. The roof framing may not carry a residential ceiling load. If the garage predates the 1970s, count on $30,000 to $55,000 just to bring the shell up to code before interior work starts. A full garage conversion typically runs $150,000 to $260,000 in Sherman Oaks.
JADU Logic for Attached Spaces
A JADU, or Junior Accessory Dwelling Unit, is a conversion within the existing footprint of the house, capped at 500 square feet, with its own entrance and a small kitchen. Because you’re not adding square footage, permits move faster and the structural questions are smaller. This works well on Sherman Oaks lots where the rear yard is already tight.
Detached Garage Conversion Trade-offs
Converting a detached garage into an ADU preserves usable yard space, but the utility runs are longer. You’re likely trenching from the main panel to the garage, which means cutting across the yard or the driveway. That’s $6,000 to $15,000 depending on the distance and what’s buried. We line-item it, not bury it in a lump sum.
Trusted Brands We Service in Sherman Oaks
We build with prefab systems from Cover and Dvele when the Sherman Oaks site works well for panelized construction, and we use Mighty Buildings for certain ADU shells where speed and precision matter. We also finish exteriors in James Hardie products, which matters on Sherman Oaks ranches where a new addition has to sit against sixty-year-old stucco without looking bolted on. Because we’re authorized with these brands, we keep local parts and finish materials moving without waiting on a regional distributor’s schedule. If a panel arrives damaged or a trim profile is backordered, we reorder through our direct channel, not a big-box store.
Common Room Addition Contractor Problems We See in Sherman Oaks Homes
- Original 100-amp electrical panels on post-war ranches. Homes built between 1945 and 1970 along streets like Ventura Canyon Avenue and Magnolia Avenue often still have the original service. An addition with a kitchenette, extra bath, or second HVAC zone will exceed it, and the fix is a service upgrade, not a bigger breaker.
- Side-yard access that won’t fit equipment. Many Sherman Oaks rear additions look easy on paper, but the side yard is six feet wide and blocked by a mature tree or an existing carport. Concrete and framing materials then get pumped or hand-carried, which adds labor costs you won’t see in a generic per-square-foot quote.
- Roofline tie-ins on low-pitch gable ranches. The existing roof on a Sherman Oaks ranch has settled after seventy years. Tying a new addition roof into it is not a straight-line cut. It requires careful flashing, structural review, and sometimes partial reframing. Plan-check catches this. Unprepared contractors get caught at inspection.
- Detached garages treated as livable shells when they aren’t. A 1955 garage in Sherman Oaks was never built to house a bedroom. Foundation prep, vapor barriers, and roof insulation all have to be brought to residential standard. Skipping this in the estimate means a five-figure surprise at rough-in.
Pricing for Room Addition Contractor in Sherman Oaks, CA
Here’s the honest range. A basic bedroom and bath addition in Sherman Oaks runs $180,000 to $260,000. A 500-square-foot in-law suite with kitchenette runs $220,000 to $360,000. A detached garage conversion to a full ADU runs $150,000 to $260,000. The per-square-foot figure most people ask for lands around $350 to $450 for site-built work, but that number moves hard based on access, electrical upgrades, and roofline condition.
What actually changes the price mid-project, in our experience, is the service upgrade, soil conditions at the foundation dig, and material delivery constraints on narrow Sherman Oaks side streets. We price those risks up front. You get a written line-item proposal with a fixed number. Call (903) 568-7222 and we’ll walk your lot with you.
We Also Serve Cities Near Sherman Oaks
If you’re just over the line in Van Nuys, Encino, Studio City, or Tarzana, we serve those areas too. The housing stock is similar, the permit path is the same LADBS system, and the pricing logic doesn’t change. Learn more about our Sherman Oaks coverage or call us directly at (903) 568-7222.
Serving Sherman Oaks, CA - Our Local Coverage Area
We’re based in the Sherman Oaks 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 About Room Addition Contractor in Sherman Oaks
Usually yes, if the home still has the original 100-amp panel that’s common on 1940s and 1950s Sherman Oaks ranches. A new kitchenette, bath, and HVAC zone will exceed 100 amps, so you’ll need a 200-amp service upgrade before rough-in. Budget $4,000 to $7,000 for the panel and utility coordination. Call (903) 568-7222 and we’ll confirm what your panel can carry.
Four to seven months is realistic for a site-built addition in Sherman Oaks. Prefab ADU shells from brands like Dvele or Cover can compress framing time, but utility work, plan check, and inspections still run on LADBS and utility-company schedules, not ours. We calendar those from day one so the timeline holds. Call (903) 568-7222 for a project-specific schedule.
In our experience, three things move the number after contract: an electrical service upgrade discovered at rough-in, side-yard access that won’t fit concrete or truss delivery and forces hand-carrying or pumping, and plan-check corrections from roofline tie-ins on older ranches. We price all three risks up front in the written proposal. That’s the whole point of a fixed number. Call (903) 568-7222 for a written price.
Yes, and on Sherman Oaks lots with rear-loading garages or alley access, it’s often the better move. The foundation and roof already exist. But you’ll need to bring the slab, walls, and roof structure up to residential code, which usually runs $30,000 to $55,000 before interior work. A full conversion typically lands between $150,000 and $260,000. Call (903) 568-7222 and we’ll assess your specific garage.
No, but the city will require the new work to be structurally compatible with the existing roofline and walls, and most Sherman Oaks homeowners want visual continuity on a street of 1950s ranches. We tie new rooflines into existing low-pitch gables and use materials like James Hardie lap siding to blend with original stucco. It reads as part of the house, not a box stapled to the back. Call (903) 568-7222 to talk through your lot.
Written by Troy Eastman, Owner at Benson ADU Builders, serving Sherman Oaks through the Relay Home Co. family, established 2006.
