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 Woodland Hills
Adding square footage to a Woodland Hills home is rarely as simple as drawing a rectangle and pouring a slab. Between the hillside grading rules north of Ventura Boulevard, the wildfire-hardening requirements baked into California Building Code Chapter 7A, and the tight lot lines that define the valley floor, this is one of the more complicated places in Los Angeles County to build. A typical Home Additions & ADU project here runs between $45,000 and $130,000, and most of that cost is driven by site conditions, not labor. We know those conditions because we work them every week. Call (877) 610-1318 and we’ll walk your lot with you before you spend a dime.
Why Barrett & Sons Construction Is Woodland Hills’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998 and never turned it into a franchise. The crews who show up in Woodland Hills are Tom’s sons and the teams they lead every day, not strangers dispatched from another county. Whether you need Bathroom Remodeling - Woodland Hills or another project, you’ll work directly with our family team. You’ll see us at the hardware store on Topanga Canyon Boulevard on Saturday morning, and Tom will answer his own phone when you call. That’s not marketing language. That’s how a 29-year owner-operated construction firm works.
We’ve built Home Additions & ADU in Woodland Hills long enough to know that every permit on a hillside lot off Mulholland Drive will get scrutinized twice, once by the grader and once by the fire marshal. Our customers tell us the reason they hired us, aside from the local reputation, is that we publish our name, our address, and our license number, and they can verify all three before signing anything. The permit inspector works for you, not for us, which is exactly why we like having him on the job.
Every change order arrives in writing before a single nail moves. Every eligible job gets permits pulled and inspections signed. And every job, from a garage conversion in 91364 to a second-story addition in 91367, carries our written 90-Day Done Right Promise. If something isn’t right, Tom comes back. One call.
Our Home Additions & ADU Services in Woodland Hills
We focus on the work that matters most to homeowners in this specific market: converting what you have, adding upward where the lot allows, and building new when there’s room. Here’s what we do most often in Woodland Hills.
ADU Design & Permitting
Most people don’t realize that a detached ADU in Woodland Hills that sits on a hillside lot north of Ventura Boulevard will trigger simultaneous hillside grading review and Chapter 7A wildfire-hardening review. We handle both. Our team draws plans that account for caisson foundations where the soils engineer requires them, specifies ember-resistant vents and ignition-resistant siding from the first draft, and walks the permit through LADBS so you don’t get a surprise correction notice six weeks into the process.
Garage Conversion ADU
Converting an attached or detached garage is often the fastest way to add a rental unit or in-law suite in Woodland Hills, especially in the ranch-style tracts from the 1950s and 1960s where garages were built oversized. But if that garage shares a wall with a neighbor, or sits within three feet of the property line, you’ll need a party-wall notice signed before framing inspection. We know which forms LADBS wants and we get them early, not after work stops.
New Detached ADU
A new detached ADU on a Woodland Hills lot gives you clean separation from the main house, but the site constraints are real. Expansive clay soils, steep grades, and narrow access alleys all change how we stage materials and where we can put a crane. We budget for what the geotechnical report actually requires, not what a flat-lot contractor assumes, and we write every allowance on paper so there are no surprises when the soils engineer calls the shots.
Junior ADU & Interior Conversion
If your home has an underused den, a large laundry room, or a bonus space above the garage, a junior ADU often doesn’t require the same level of site work. But interior conversions still need their own kitchenette plumbing, sound separation, and a separate exterior entrance. In Woodland Hills, where most of the housing stock is decades old, we also check for original wiring and cast-iron drain lines that need upgrading before we close the walls.
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.
Trusted Brands We Service in Woodland Hills
We install materials you can look up, not mystery brands off a van. For hardscape and exterior work around an ADU site, we regularly spec Techo-Bloc and Cambridge Pavers for retaining walls, patios, and driveway aprons, because they hold up to the extreme heat this valley throws at them. For structural concrete work, we rely on Quikrete products specified to the engineers’ mix design. We keep common materials stocked locally so your job doesn’t stall waiting on a delivery from across the county.
Common Home Additions & ADU Problems We See in Woodland Hills Homes
- Party-wall stops. A second-story addition within three feet of a shared property line in the denser 91364 and 91367 tracts requires written sign-off from the neighbor before framing inspection. We flag this on day one, not when the inspector red-tags the job.
- Foundation surprises on clay. The expansive soils along the Mulholland Drive corridor move more than most homeowners expect. A standard slab design that works in Canoga Park may need caissons here, and the soils report tells us which. We budget for it before the permit is even filed.
- Fire-hardening change orders. Ember-resistant vents and ignition-resistant siding are not optional upgrades in the VHFHSZ. If a contractor scopes them out of the initial bid to look cheaper, you’ll get a change order after rough-in that adds weeks and thousands. We write them into the first quote.
- Thermal expansion failures. Woodland Hills regularly records the hottest temperatures in LA County. Stucco and roofing underlayment specified for coastal conditions can crack or delaminate early here. We spec materials with enough expansion allowance to survive a 121-degree afternoon.
Pricing for Home Additions & ADU in Woodland Hills, CA
Here’s what you can realistically expect to pay in this market, based on the work we’ve quoted and completed across 91364, 91365, 91367, and 91371.
| Project | Woodland Hills Price Range |
|---|---|
| Home Addition | $45,000 - $130,000 |
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
| Second Story Addition (custom, hillside) | $80,000 - $200,000 |
What moves the number most on a Woodland Hills project is the site itself. A flat-lot garage conversion in the valley floor will sit at the low end. A second-story addition on a hillside lot with caissons, fire-hardened exterior assemblies, and steep-access staging will climb toward the top. We give you a written line-item quote before any contract is signed, and every change after that arrives as a written change order. Call (877) 610-1318 for a free estimate on your specific property.
We Also Serve Cities Near Woodland Hills
Our crews work throughout the west San Fernando Valley and into the hills. If you’re in Canoga Park, Calabasas, West Hills, or Topanga, you’ll get the same crews, the same written change orders, and the same 90-Day Done Right Promise that homeowners in Woodland Hills count on.
Serving Woodland Hills, CA - Our Local Coverage Area
We’re based in the Woodland Hills 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 Woodland Hills
A detached ADU on a hillside lot north of Ventura Boulevard in Woodland Hills will typically require a geotechnical soils report, hillside grading review through LADBS, and Chapter 7A wildfire-hardening compliance, including ember-resistant vents, ignition-resistant siding, and Woodland Hills Roofing with Class A fire-rated materials. These are not optional and they will not be waived. Call (877) 610-1318 and we’ll tell you exactly what applies to your parcel before you spend money on plans.
Yes, but if the shared garage wall sits within three feet of the property line, LADBS requires a party-wall notice and written sign-off from the affected neighbor before framing inspection. We prepare that notice early, deliver it personally when we can, and build the schedule around the response time rather than letting the job stall. Call us for a free estimate at (877) 610-1318.
Because Woodland Hills sits in the Very High Fire Hazard Severity Zone at the wildland-urban interface of the Santa Monica Mountains, and any substantial remodel or addition triggers California Building Code Chapter 7A fire-hardening requirements, plus hillside grading review on sloped lots, which Sherman Oaks simply doesn’t face. Add in expansive clay soils requiring caissons on many hillside parcels, and the engineering and materials costs are genuinely higher here. We’ll show you the line items so you can see exactly where the money goes.
Los Angeles municipal code generally limits construction noise in residential zones to 7:00 a.m. to 9:00 p.m. on weekdays and 8:00 a.m. to 6:00 p.m. on Saturdays, with no noisy work on Sundays or federal holidays, though a specific Woodland Hills neighborhood or HOA may impose tighter hours. We’ll confirm the rules that apply to your street and build the schedule around them. Toll-free estimates are at (877) 610-1318.
If the original quote did not include the structural beam, post, footing, and engineering stamp required to remove that wall, then yes, it needs a written change order. We scope load-bearing work during the estimate walkthrough, but if something hidden shows up after demo, you’ll get the price on paper before we proceed, never after the work is done. That’s how Tom has run Barrett & Sons since 1998.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Woodland Hills and the surrounding San Fernando Valley since 1998.