A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across Woodland Hills
A home addition in Woodland Hills typically runs $180 to $420 per square foot depending on scope, site conditions, and whether your lot falls inside the Very High Fire Hazard Severity Zone boundary. That range puts a 400 sq ft primary bedroom and bath addition somewhere between $72,000 and $168,000 before design and permit fees. We know those numbers because we price Woodland Hills work every week, and we put our number in writing before the first hammer swings.
If you’re planning a room addition, second story, bump-out, or full ADU off Ventura Blvd, Topanga Canyon Blvd, or in the neighborhoods south of the 101, call us at (903) 568-7222. We’ll scope the job, flag any fire-zone or unpermitted-structure issues early, and give you a written price that doesn’t drift. Our Home Addition Contractor team coordinates scheduling from our Los Angeles office, but the crews working on your Woodland Hills property live and build here in the west Valley.
Why Benson ADU Builders Is Woodland Hills’s Preferred Home Addition Contractor Company
Woodland Hills homeowners don’t want a sales pitch. They want a contractor who knows that a 1958 ranch on a sloped lot above Mulholland has a different permit path than a 1980s two-story in Warner Center. That’s the work we do. Troy Eastman has built our process around one rule: the price you sign is the price you pay. No change orders because someone “didn’t see” the slope coming. No surprise trenching costs after demo day.
We carry a 365-Day Done Right Promise on every project we build. If something isn’t right within a full year, we come back and make it right, backed by a written guarantee stamped on your project file. Our technicians are background-checked and show up in uniform. When you call (903) 568-7222, a live person answers, not a voicemail tree. That matters when you’re trying to line up a framing inspection and need an answer at 7 a.m.
We also build with prefab brands homeowners can research themselves: Abodu, Cover, Dvele, and Mighty Buildings. If a panelized system makes more sense for your site than stick framing, we’ll tell you and show you real pricing for both paths. Most Woodland Hills clients appreciate seeing a side-by-side rather than getting one take-it-or-leave-it option.
Bathroom Addition Contractor in Woodland Hills
A bathroom addition in Woodland Hills typically costs $35,000 to $85,000 depending on whether you’re adding a full bath with a tub and shower or a three-quarter bath, and whether your lot is flat or sloped. The first thing a Bathroom Addition Contractor should do in Woodland Hills is confirm where your sewer line runs and whether your existing rear structure, if any, was permitted. A surprising number of mid-century homes here have unpermitted patio slabs or converted carports, and that changes the permit path for any new square footage.
Bathroom Additions on Sloped Lots
Many Woodland Hills lots south of Ventura Blvd sit on real grade. If your addition wraps around a downhill side, expect trenching and concrete costs to land 15 to 25% above a flat-pad estimate. We bring that up at the first walkthrough because you should know it before you sign, not after the excavator shows up.
Plumbing Runs and Existing Slabs
If your main drain line runs under a patio you plan to build over, moving or sleeving that line adds cost. On 1950s and 1960s Woodland Hills homes, we sometimes find cast-iron drains that should be replaced while the trench is open anyway. We’ll scope that with a camera inspection and show you the line item.
Bedroom Addition Contractor in Woodland Hills
A bedroom addition in Woodland Hills typically runs $150 to $300 per square foot for the build itself, so a 12×14 primary bedroom addition lands between $25,000 and $50,000 before finishes, permits, and any fire-zone upgrades. A good Bedroom Addition Contractor in Woodland Hills will check two things before quoting: whether the lot falls within the Very High Fire Hazard Severity Zone boundary, and whether any existing rear structure has a valid permit on file with LADBS.
Primary Suite Additions
A primary suite with a walk-in closet and full bath is one of the most common projects we price in Woodland Hills. These run $220,000 to $350,000 as a package depending on size and grade of finishes. We give a written line-item quote so you can see exactly where the money goes.
Bedroom Over Garage or Carport Conversions
If you have an attached garage or carport you want to build over or convert, we check the original permit history first. In Woodland Hills, many carports were added after the house was built and never recorded. That doesn’t kill the project, but it does mean a correction permit gets folded into the plan set.
Trusted Brands We Service in Woodland Hills
We build and install with brands that Woodland Hills homeowners can look up before they ever call us. On the prefab and panelized side, we work with Abodu, Cover, Dvele, and Mighty Buildings. For cladding and fire-resistant envelope work, we spec James Hardie siding, which matters if your lot sits inside the Chapter 7A fire hazard zone boundary. Because scheduling and dispatch run through our Los Angeles office, we can coordinate material deliveries and prefab panel drops along the 101 corridor to Woodland Hills quickly, usually within a week of permit sign-off. If a prefab panel has a factory defect, we handle the warranty exchange so you’re not stuck on the phone with a manufacturer.
Common Home Addition Contractor Problems We See in Woodland Hills Homes
- Skipping the LADBS fire hazard zone checkbox. The southern hillside edges of Woodland Hills sit in a Very High Fire Hazard Severity Zone. If your designer or contractor misses that on the plan set, you’ll get a plan check correction that stalls the permit for weeks while the boundary gets re-verified. We check zone maps on day one.
- Quoting before confirming what’s already unpermitted. A bedroom or bathroom addition attached to a patio cover or converted carport that was never permitted gets pulled into a correction permit. That adds time and cost that a verbal estimate never mentioned. We pull the LADBS record before we quote.
- Underestimating slope-related trenching and concrete. Some Woodland Hills lots drop 8 to 10 feet from front to back. The flat pad assumed at bid doesn’t exist. We walk the grade with a transit and quote the real number, not a number that “may need adjusting later.”
- Rushing past Chapter 7A ignition-resistant requirements. If your addition is in the hazard zone, the envelope needs ignition-resistant materials, including Class A roof assembly and ember-resistant vents. Our crews are trained on Chapter 7A details, so framing doesn’t get red-tagged at inspection.
Pricing for Home Addition Contractor in Woodland Hills, CA
For room additions, budget $150 to $300 per square foot. Bathroom additions run $35,000 to $85,000. Bedroom additions, $25,000 to $50,000 for the framing and shell. Second-story additions in Woodland Hills run $250 to $450 per square foot because of structural reinforcement, fire-zone materials, and stair integration. Sunroom additions, often the most economical, run $120 to $220 per square foot.
The real cost drivers are lot slope, sewer line location, fire hazard zone requirements, and whether existing structures need correction permits. That’s why we give a written price after we’ve walked the property and pulled the permit history. You’ll know the number before you commit. Call (903) 568-7222 to schedule your free estimate. We serve Woodland Hills, Canoga Park, Topanga, Tarzana, and West Hills.
Homeowners choose Benson ADU Builders because they see the Woodland Hills difference on their own street: a contractor who names the fire zone, pulls the permit history, and puts the price in writing. That’s The Relay Visibility Guarantee, and it applies to every project we build in Woodland Hills.
We Also Serve Cities Near Woodland Hills
Our crews regularly price and build home additions in Canoga Park, Topanga, Tarzana, and West Hills. Each has its own permit and fire-zone quirks, but the process is the same: walk the lot, pull the records, and give you a written price before work begins. Call (903) 568-7222 and we’ll set up a time that works for your schedule.
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 About Home Addition Contractor in Woodland Hills
Yes. If your lot sits inside the VHFHSZ boundary, usually along the southern hillside edges south of the 101, your addition must meet Chapter 7A ignition-resistant construction standards. That means Class A roof assembly, ember-resistant vents, and ignition-resistant siding like James Hardie fiber cement. In practice, that adds $15,000 to $40,000 to a 400 sq ft addition depending on how much of the existing envelope is touched. The permit plan check will also take longer while LADBS verifies the zone boundary. We map your parcel before quoting so you’re not blindsided mid-plan-check. Call (903) 568-7222 for an exact quote, free.
We pull your LADBS permit history during the scoping walk. If there’s an unpermitted patio slab, rear structure, or converted carport, it has to be folded into a correction permit before the new addition can be titled. That typically adds 2 to 4 weeks of plan check time and $3,000 to $10,000 in correction fees and lightweight retrofits. Most Woodland Hills mid-century homes have at least one unpermitted rear feature, so this is routine for us, not a surprise. Call (903) 568-7222 and we’ll walk you through what we find.
Plan for 4 to 6 months from first walkthrough to move-in for a ground-up room addition in Woodland Hills. Design and plan check typically take 6 to 10 weeks, fire hazard zone review can add 2 to 4 weeks, and construction runs 8 to 14 weeks for a 400 sq ft addition. If prefab panels from Abodu or Cover are used, framing time drops significantly, but the LADBS approval timeline doesn’t change. We’ll give you a realistic calendar at the first meeting and update it as milestones clear. Call (903) 568-7222 for a project timeline specific to your street.
Lot slope, sewer line placement, fire hazard zone status, and unpermitted existing structures. A flat lot in the flatlands north of Ventura Blvd on a newer sewer line will price lower than a sloped lot south of Mulholland with cast-iron drains and a VHFHSZ overlay. Finishes also swing the number: a standard tub-shower setup versus a curbless walk-in with tile to the ceiling can differ by $12,000 in a bathroom alone. We break every quote down line by line so you can see what’s driving your number. Call (903) 568-7222 and ask about pricing on your specific scope.
In some cases. Abodu and Cover panels are engineered primarily for detached ADU builds, but their panelized wall systems can work for certain bump-out and bedroom addition projects in Woodland Hills, especially when we need to reduce on-site framing time. Mighty Buildings offers panelized exterior envelopes that can simplify fire-zone compliance, which is useful on hillside lots. We’ll tell you honestly when a prefab path saves you money and when stick framing is the better call for your addition. Call (903) 568-7222 for a side-by-side comparison on your project.
Written by Troy Eastman, Owner at Benson ADU Builders, serving Woodland Hills.
