A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted Home Addition Contractor for Woodland Hills Homeowners
Adding square footage to your home in Woodland Hills is one of the smartest ways to build equity and create room for the way you actually live now. A home addition in this part of the San Fernando Valley typically runs between $180 and $420 per square foot depending on the type of space, the foundation work involved, and the finish level you choose. At Benson ADU Builders, led by Troy Eastman, we put a written price in front of you before any work starts, so the number you approve is the number you pay. That’s the Relay Visibility Guarantee, and it’s stamped on every project we take on from our home base in Woodland Hills. Call (559) 282-2291 to talk through your project with a live person, any hour of the day.
Sunroom Addition
A sunroom addition gives you a light-filled transitional space that sits somewhere between indoors and out, and it’s the most cost-effective way to add usable square footage to a Woodland Hills home. When you need a Home Addition Contractor - Woodland Hills residents trust, experience with local setback rules matters. In this neighborhood, a site-built sunroom addition typically lands between $45,000 and $95,000 depending on the foundation type, glazing package, and whether you’re tying into the existing roofline or building a freestanding structure with a connector. Our team handles the full scope: structural engineering sign-off, slab or pier foundation, framing with James Hardie siding to match your existing exterior, low-E glass, electrical, and the final inspection. Troy Eastman walks every sunroom project through setback verification before plans are drawn, because a sunroom that encroaches on a side-yard setback is a costly mistake to correct after framing is up.
Three-Season vs. Four-Season Design
A three-season sunroom keeps costs down and works well in the Valley’s temperate climate, but it won’t have dedicated HVAC and will get warm in August. A four-season design ties into your home’s heating and cooling system, which adds cost but makes the space genuinely livable year-round. We’ll show you the pricing difference in writing before you commit to either route.
Permit Path and Setback Checks
Sunroom additions in Woodland Hills almost always require a building permit, and the city will review your project against current setback standards for your zone. We pull the permit, schedule the inspections, and make sure the final signed-off permit matches the work that was actually built. That’s part of the written guarantee, and it’s not something you want to leave to verbal promises.
Second Story Addition Contractor
A second story addition contractor takes your single-story Woodland Hills home and builds upward, which is often the only route when your lot is already built out to its footprint. Second-story additions in this market generally run between $220 and $420 per square foot, with total costs for a 600 to 1,000 square foot upper level typically landing between $180,000 and $380,000 once you factor in structural retrofitting of the existing first floor, stair placement, and mechanical relocations. Benson ADU Builders handles the full structural scope under one written price: we bring in a licensed structural engineer early, evaluate your existing foundation and wall framing, and design the upper floor so the final product doesn’t just meet code but actually feels like it was always there. That early engineering pass matters more on a second story addition than any other project type we take on in Woodland Hills.
Foundation and Framing Assessment
Not every single-story home is built to carry a second floor, and we’ll tell you that before you spend money on architectural plans. We inspect the existing foundation width, shear wall locations, and header spans to confirm what the structure can support. If retrofitting is needed, it’s priced in the initial written estimate, not discovered mid-project as a change order.
Stair Placement and Floor Plan Logic
Where the stairs land determines how much usable space you actually gain, and a poorly placed stair can eat 100 square feet of your new upper floor. We work through two or three stair placement options with you before plans are finalized. The goal is a second story that flows from the existing floor plan without a dead-end hallway or an awkward landing.
Garage Addition Contractors
Garage addition contractors in Woodland Hills help homeowners who need more than just parking, whether that means a larger garage with a workshop, a garage conversion into living space, or a new garage with an ADU above it. If you’re in a neighboring area, our Home Addition Contractor in Canoga Park handles similar garage and ADU projects with the same written-price approach. A standard two-car garage addition typically costs between $65,000 and $140,000 in this area, while a garage conversion into a conditioned living space usually runs $90 to $180 per square foot. Benson ADU Builders brings something most garage addition contractors in Woodland Hills can’t: access to Tuff Shed and Abodu prefab garage structures that cut build time significantly, or site-built options with James Hardie siding when you want the new garage to match your home exactly. Troy Eastman walks every garage project through the full permit cycle, including the special requirements that come up when a garage is attached to a dwelling or converted into habitable space.
Attached vs. Detached Garage Decisions
An attached garage addition is cheaper per square foot because it shares a wall and utilities with the existing structure, but it may trigger fire-rating requirements on the shared wall. A detached garage gives you more design freedom and keeps the ADU option open later. We show both numbers in writing so you’re deciding on cost, not guessing.
Conversion Considerations
Converting an existing garage into a bedroom, office, or rental unit means bringing the slab, insulation, windows, and electrical up to current living-space code. The slab elevation and drainage around the existing structure often drive the price more than anything else. We inspect these factors before quoting so your written price reflects the actual work required, not a generic estimate.
Bathroom Addition Contractor
A bathroom addition contractor in Woodland Hills handles the plumbing, electrical, waterproofing, and finish work required to add a full or half bath where none existed before. Adding a bathroom in this market typically runs between $35,000 and $85,000 for a well-appointed full bath, with the wide range driven by whether you’re building into existing interior space, adding a bump-out, or stacking above an existing bathroom on a second story. Benson ADU Builders does full bathroom additions end to end: we cut the slab for new drain lines, run new supply plumbing, pull the electrical permit for a dedicated circuit, and install a properly vented exhaust fan that meets current Woodland Hills building code. The finished bathroom is inspected and signed off before we hand it back to you, and it’s covered by our 365-Day Done Right Promise in writing.
Plumbing Location Drives the Price
If your new bathroom sits near an existing drain stack, the plumbing cost drops significantly. If it’s across the house, you’re paying for more pipe, more slab cutting, and more drywall patching. We walk you through the plumbing reality of your floor plan during the estimate, not after demo starts.
Waterproofing Standards
A failed shower pan or a poorly sealed tub surround is the most expensive bathroom repair that doesn’t show up for two years. We use tested waterproofing systems, including full-membrane pan liners and sealed backer board, and we document the waterproofing with photos before tile goes up. Those photos are yours as part of your project record.
Bedroom Addition Contractor
A bedroom addition contractor builds new sleeping space onto your Woodland Hills home, and it’s one of the most straightforward ways to add resale value in this market. For homeowners in the hills nearby, a Topanga Home Addition Contractor from our team brings the same bedroom addition expertise to that market. A standard bedroom addition with closet and egress window typically costs between $55,000 and $120,000 in Woodland Hills, depending on whether it’s a simple first-floor addition, a second-story bedroom, or a space carved out of an existing oversized room with new walls and a properly sized egress window. Benson ADU Builders handles bedroom additions with the same written-price discipline we bring to every project, which means the quote you approve includes the egress window, the closet, the electrical, the insulation, and the final paint. Troy Eastman and our crew pull the permit, schedule every inspection, and make sure the room meets current California bedroom code before you put a bed in it.
Egress Requirements Save Lives and Permits
A bedroom in California needs an egress window sized so a person can exit in a fire, along with a minimum ceiling height and a closet or armoire space. If your existing room doesn’t meet egress, it can’t legally be called a bedroom when you sell. We verify egress compliance early so the finished room is a legal bedroom on paper.
Closet and Storage Logic
The difference between a room that works and a room that feels cramped comes down to closet placement and window location. We work through the layout with you before framing so the bed, the closet, and the door swing all make sense together. It’s the kind of detail that’s hard to change after drywall is up, so we get it right in the plan.
Brands We Service
We’re authorized to build with Abodu and Cover prefab ADU and addition systems, which means your project can be delivered in panels or modules and assembled on site in a fraction of the time a site-built addition takes. Our team has completed Abodu and Cover installations across the San Fernando Valley, and we handle the site work, foundation, utility connections, and final trim so the finished project looks intentional, not factory-dropped.
For traditional site-built additions with a cladding system that holds up to Valley heat and dry winds, we specify James Hardie fiber cement siding and trim. We also work with Tuff Shed structures for garage and workshop additions where a prefabricated building makes more sense than full site-built construction. Whether you have Abodu, Cover, James Hardie, Tuff Shed, or any other make, we can help.
Signs You Need a Pro Right Now
- Your home no longer fits how you live. A growing family, a parent moving in, or a work-from-home job that’s become permanent all point to one thing: you need more space. Waiting doesn’t make the need smaller, and building costs in Woodland Hills trend upward year over year.
- You’re renting a storage unit for things that belong in your home. If you’re paying $200 to $400 a month for off-site storage, that money is better spent on a permanent addition. A bedroom or garage addition puts that monthly payment into your own equity instead.
- You’ve been thinking about moving but love your street and your mortgage rate. Adding square footage is often cheaper than selling, buying, and moving in this market. A well-executed addition in Woodland Hills can add enough value to make staying the clear financial winner.
- You got a verbal estimate from another contractor that keeps shifting. A price that moves after the project starts is the number-one complaint we hear from Woodland Hills homeowners. If you’re already frustrated, that’s a sign to get a written price from a contractor who commits to it in writing.
- You’re looking at a big-ticket remodel but haven’t seen a single permit number. Unpermitted work can haunt you at resale and create real safety problems. A pro who pulls permits and passes inspections is the difference between an addition that adds value and one that creates liability.
Our Process, Step by Step
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Call and talk to a real person. You call (559) 282-2291 and reach a live person, not a voicemail tree, 24 hours a day. We listen to what you’re trying to build, ask about your lot and your goals, and schedule a site visit. You’ll know the next step before you hang up.
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Site walk and feasibility check. Troy Eastman or one of our senior project leads walks your property in Woodland Hills, checks setbacks, looks at foundation access, and answers questions about what’s actually buildable. We’re honest when a project doesn’t pencil out, which saves you from paying for plans that won’t get permitted.
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Written scope and line-item price. You get a written estimate with a line-item breakdown of every phase: foundation, framing, electrical, plumbing, finishes, and permit fees. That number is the price, and it doesn’t move unless you ask for a change to the scope. No verbal estimates, no “we’ll figure it out later.”
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Permits, build, and real-time updates. We pull the Woodland Hills permits, schedule inspections, and keep you updated with photos and progress notes as the work happens. You’ll know when the framing inspection passed and when the crew will be on site, without calling to chase down answers.
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Final walkthrough and written guarantee. Before we call the project done, we walk the finished addition with you, cover any remaining concerns, and hand you the 365-Day Done Right Promise in writing. If something isn’t right within a full year, we make it right. That’s the guarantee, stamped on every project.
How Much Does Home Addition Contractor Cost in Woodland Hills?
A home addition in Woodland Hills runs anywhere from $45,000 for a simple sunroom to $380,000 or more for a fully engineered second story. Most projects fall into these ranges based on the type of addition:
- Sunroom addition: $45,000 – $95,000
- Bedroom addition: $55,000 – $120,000
- Garage addition or conversion: $65,000 – $140,000
- Bathroom addition: $35,000 – $85,000
- Second story addition: $180,000 – $380,000
What drives the price: foundation work and soil conditions on your specific lot, the distance from your new plumbing to an existing drain line, whether the addition ties into your existing roofline, and the finish level you choose. Structural retrofitting is the single biggest variable on second-story work, and it’s something we identify early so it’s priced in the written estimate, not billed as a surprise later. To avoid overpaying, get a line-item written price that shows exactly what’s included, ask whether permit fees are in the number, and be wary of any contractor who won’t put the price in writing before work starts. Our free estimate includes the full written scope and price, so you can compare it against any other bid with confidence. Call (559) 282-2291 to schedule yours.
Our Service Area Near Woodland Hills
Benson ADU Builders serves Woodland Hills and the surrounding communities across the West Valley, including Home Addition Contractor in Tarzana, Home Addition Contractor in Brentwood, Calabasas, Canoga Park, West Hills, Winnetka, Reseda, Encino, Topanga, Bel Air, and Chatsworth. If you’re in Woodland Hills proper, we’re typically on site within a day or two of your call for an initial walkthrough. For homes in Tarzana, Encino, or Canoga Park, expect the same quick turnaround and the same written-price commitment.
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.
Frequently Asked Questions About Home Addition Contractor in Woodland Hills
A home addition contractor is a licensed professional who designs, permits, and builds new living space onto an existing home, including sunrooms, bedrooms, bathrooms, garages, and second stories. Benson ADU Builders handles the full scope from engineering to final inspection, with a written price before work starts. Call (559) 282-2291 to discuss what you want to build.
Most single-room additions take 8 to 14 weeks from permit approval to final inspection, while a second story can take 4 to 8 months. Woodland Hills permit review times vary by project scope and current city workload, which is why we handle the permit submittal early. For a realistic timeline on your specific project, call (559) 282-2291 and we’ll walk you through it.
Home additions in Woodland Hills typically range from $35,000 for a simple bathroom addition to $380,000 for a large second story, with most projects falling between $45,000 and $140,000. The finished cost depends on the size of the addition, the foundation work required, and the finish level you choose. Our written estimate gives you a firm number before any work starts. Call (559) 282-2291 for an exact quote on your project.
Yes, we’re authorized to build with Abodu and Cover prefab addition and ADU systems, as well as James Hardie siding and Tuff Shed structures. Prefab systems can cut build time significantly because the panels or modules are manufactured off-site and assembled at your Woodland Hills property. Call (559) 282-2291 to compare prefab versus site-built pricing for your addition.
If a failed addition, sunroom, or structural issue is creating a safety or water intrusion problem, call (559) 282-2291 and we’ll get a crew member on the phone immediately, 24 hours a day. We can assess the situation and schedule a priority visit if the condition threatens your home. Every emergency call starts with a real person, not a voicemail.
Every project we build comes with a 365-Day Done Right Promise in writing: if the work isn’t right within a full year, we make it right. That includes workmanship issues across the entire addition, and we also provide a free second visit if any covered repair fails. The warranty is a written guarantee stamped on every project, not a verbal promise.
Have a rough idea of what you want to build, any HOA documents if applicable, and your property’s parcel number if you have it. We handle the rest, including setback verification and buildability assessment. The estimate itself is free and comes with a written scope and price. Call (559) 282-2291 when you’re ready to schedule.
Schedule Your Home Addition Contractor Service in Woodland Hills Today
Ready to add space to your Woodland Hills home? Call (559) 282-2291 and you’ll reach a live person who can schedule your free, no-obligation estimate. You’ll get a written price before any work starts, a 365-Day Done Right Promise in writing, and a project that’s permitted, inspected, and built to code. Troy Eastman and the crew are ready when you are.
Written by Troy Eastman, Owner at Benson ADU Builders, serving Woodland Hills since 2006.
