A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted Room Addition Contractor for Woodland Hills Homeowners
Adding a room to your Woodland Hills home typically costs between $120,000 and $280,000 for a standard addition, with prefab and modular options starting around $90,000. For expert guidance, contact a Room Addition Contractor - Woodland Hills. Benson ADU Woodland Hills is led by Troy Eastman, and every project starts with a written price before any work begins, never a vague verbal estimate. We build with materials and prefab systems you can research yourself, including Abodu, Cover, and James Hardie cladding. If you’re planning a nursery, a home office, or space for aging parents, call (559) 282-2291 and you’ll get a real person on the line, not a voicemail loop.
Here’s the thing most Woodland Hills homeowners don’t hear until it’s too late: the contractor who gives you a number over the phone isn’t the one who shows up with a change order three weeks into framing. We put the plan and the price in writing from the first conversation, and our 365-Day Done Right Promise means if something isn’t right within a full year, Troy Eastman and the team make it right. No fine print gymnastics. No “that’s not covered.” Just a written guarantee stamped on every project we take on.
Key Takeaways
- Room additions in Woodland Hills run $120,000-$280,000 for site-built work, with prefab options starting near $90,000 depending on size and finish level.
- Written price before work starts is standard on every Benson project, not an upsell.
- 365-Day Done Right Promise covers workmanship for a full year, in writing.
- We build with prefab brands you can verify: Abodu, Cover, James Hardie, and more.
- Live person answers every call, 24/7. No phone tag, no Monday-morning callbacks.
Sunroom Builders
Sunroom Builders in Woodland Hills specialize in glass-forward room additions that bring in natural light without the full cost of a traditional stick-built addition, typically running $45,000 to $110,000 depending on glazing, foundation work, and whether you choose a prefab panel system or site-built framing. Benson ADU Woodland Hills handles everything from the concrete pad to the final trim, and we’ll give you a written price before we touch a single board. A sunroom is the right call when you want a reading room, a plant room, or a breakfast space that feels outdoors without the Santa Ana wind.
Prefab Sunroom Systems
We’re authorized to build with Tuff Shed and Cover sunroom configurations, which means your panels arrive pre-cut and pre-engineered. That cuts framing time down significantly and reduces the number of days a crew is on your property. You still get the same 365-Day Done Right Promise, and the price is locked before delivery.
Glass and Glazing Choices
Woodland Hills summers are hot, so we steer most homeowners toward low-E glass with a solar heat gain coefficient that actually works for our climate. James Hardie siding on the non-glass walls gives you a finish that holds up to heat and dry air without warping. We’ll walk you through the tradeoffs in plain English, not product-brochure jargon.
Room Additions
Room Additions in Tarzana expand your home’s square footage by building directly onto the existing structure, and in Woodland Hills a single-room addition typically lands between $120,000 and $280,000 depending on whether you’re adding a bedroom, a bathroom, or a combined suite with plumbing. Benson ADU Woodland Hills manages the design, permitting, foundation, framing, and finish work under one written contract. This is the right option when you’re outgrowing your floor plan but the lot has room to grow outward rather than up.
Foundation and Setback Considerations
Woodland Hills lots vary widely, from hillside parcels to flat postwar tracts, and setbacks, the required distance between your addition and the property line, determine how far you can build out. We handle the survey and the city paperwork so you don’t have to decode planning-department language. Every estimate accounts for foundation type, whether it’s raised or slab, before we hand you a number.
Bedroom vs. Multi-Purpose Additions
A single bedroom addition without plumbing is the most economical route, while a combination suite with a bathroom pushes the budget higher because of the sewer and water rough-in. We’ll show you the cost delta between options before you commit, so you’re making a decision with real numbers, not a wish list. Troy Eastman reviews every estimate personally before it goes to the homeowner.
Modular Home Addition
Modular Home Addition construction in Woodland Hills uses factory-built modules that arrive on a truck and get set onto your foundation, typically ranging from $90,000 to $220,000 for a single-module addition with site work, delivery, and finish included. Benson ADU Woodland Hills is authorized to build with Abodu and Boxabl systems, which are engineered off-site and then craned into place in a matter of days. This route makes sense when you want a faster build and tighter quality control than site framing allows.
Abodu and Boxabl Options
Abodu units are designed specifically for California setback and permitting rules, which removes a lot of the guesswork for Woodland Hills homeowners. Boxabl’s folding modules are compact enough for tighter lots where a wide crane swing isn’t possible. We’ll help you pick the system that actually fits your parcel, not the one that’s easiest for us to sell.
Site Work and Utility Connections
The module itself is only part of the cost. Foundation excavation, utility trenching, electrical service upgrades, and finish exterior work are all part of the final number, and we include them in your written price up front. You won’t get a “module cost” quote that doubles once the site crew shows up. Every Benson ADU Woodland Hills project starts with a full site walk and a line-item breakdown.
Home Addition Plans
Home Addition Plans are the architectural drawings and structural documents required before Woodland Hills can issue a building permit, and plan sets for a standard room addition run from $4,000 to $12,000 depending on complexity, engineering requirements, and how many revision rounds are needed. Benson ADU Woodland Hills includes plans in the total project price when you build with us, rather than billing them as a separate surprise line item. You’ll know what the drawings cost before we start, because that number is in the written estimate.
Drafting and Structural Engineering
Every plan set needs a structural engineer for the foundation and roof loads, and on hillside lots in Woodland Hills that engineering gets more involved. We coordinate the architect or designer, the engineer, and the city plan-checker so the process doesn’t stall because one stamp is missing. You see the full plan set before submission, and you approve every sheet.
Permitting and Plan Check
Plan check turnaround times vary by city workload, and no honest contractor will promise you a specific week count. What we will promise is that your submittal is complete the first time, because incomplete drawings are the number one cause of permit delays. We track the package through the process and update you at every step, which is part of The Relay Visibility Guarantee.
In Law Suite Builders
In Law Suite Builders create self-contained living spaces attached to or detached from the main house, and in Woodland Hills these projects usually run $140,000 to $300,000 when they include a kitchenette, a bathroom, and a private entrance. Benson ADU Woodland Hills builds in-law suites that work for aging parents, adult children coming back home, or long-term guests who need their own space without walking through your kitchen to get to it. These projects fall under ADU rules in California, which means specific size limits and setback allowances.
Attached vs. Detached In-Law Suites
An attached suite converts or extends from your existing home, while a detached suite takes advantage of the state’s ADU allowances for backyard structures. Detached builds give your family member more privacy and often hold resale value better as a rental unit later. We’ll price both configurations so you can compare real numbers, not rough guesses.
Plumbing and Kitchenette Rough-In
The cost difference between a bedroom and a true in-law suite comes down to plumbing, a kitchenette means water supply, drainage, venting, and usually a dedicated electrical circuit for a cooktop or microwave. Benson ADU Woodland Hills coordinates the MEP (mechanical, electrical, plumbing) work with licensed trades and wraps it into one written contract. No add-on invoices when the plumber shows up.
ADU Conversion
ADU Conversion turns existing space, usually a garage, a basement, or an underused wing, into a legal accessory dwelling unit, and in Woodland Hills a garage conversion runs $100,000 to $250,000 depending on whether the existing slab, framing, and roof are salvageable. Benson ADU Woodland Hills evaluates the existing structure first, because a conversion sometimes costs as much as a new build once you factor in foundation repair and termite work. The advantage is that you’re using square footage you already own instead of losing yard space.
Garage Conversion Reality Check
Most Woodland Hills garages were built as parking, not living space, which means the slab may need to be raised or insulated, the walls may need to be reframed for windows and insulation, and the electrical panel may need an upgrade. We inspect all of it during the estimate so the price you get on day one reflects the actual work. If the existing structure is too far gone, we’ll tell you that too, even if it means a smaller job for us.
Pre-Fab Conversion Options
For some conversions, a prefab system like Cover or a Tuff Shed shell can be installed inside or alongside an existing structure faster than stick-framing the same square footage. You get the same written guarantee and the same 365-Day Done Right Promise, but with less on-site construction time. We’ll show you the option if it makes financial sense, and skip it if it doesn’t.
Brands We Service
Benson ADU Woodland Hills is an authorized builder for Abodu, one of the leading prefab ADU brands in California. Abodu’s units are pre-approved for many of the state’s standard building codes, which means we can help you skip some of the plan-check back-and-forth, and we handle the site work, foundation, and utility hookups so the unit is fully livable, not just dropped off. You can research Abodu’s specifications independently before you even call us, and we’ll answer questions about which model fits your Woodland Hills lot.
We also build with Cover, a panelized system that offers a different design language and a high level of interior finish precision, and we use James Hardie fiber cement siding on custom builds for siding that handles the dry Southern California climate without the warping you see in vinyl. Tuff Shed structures can work for storage or workshop additions when a full conditioned space isn’t needed. Whether you have a specific brand in mind or want us to compare options across Abodu, Cover, Tuff Shed, and James Hardie, we’ll give you a straight answer on what works for your budget and your lot.
Signs You Need a Pro Right Now
- You’re tripping over family members in shared spaces. When every morning involves a bathroom line or someone working from the dining room table, a room addition stops being a “someday” project and becomes a daily quality-of-life issue. The longer you wait, the more compressed the living situation gets, and resale buyers in Woodland Hills notice when the floor plan doesn’t match the price tag.
- Your parents need to live closer but not in the same bedroom. An in-law suite built to ADU standards gives aging parents real privacy and a kitchenette, which is the difference between a guest room and a home. Waiting until there’s a fall or a health scare means building under emotional pressure, which is the worst time to be making a six-figure decision.
- You’re paying for a storage unit every month. A garage conversion or a modest addition that adds real storage space can replace that recurring bill. We’ve seen Woodland Hills homeowners paying $300 to $600 a month for off-site storage while their own footprint sits underused, and converting that space pays for itself over time.
- Remote work is now permanent and your “office” is a corner of the living room. Video calls from the couch aren’t a long-term plan. A dedicated home office addition with proper sound separation and its own circuit for electronics is the difference between a workday that hums along and one that grinds through every interruption.
- You’ve got equity to work with and no interest in moving. If you bought your Woodland Hills home before the recent price run-up, you have options that a mover doesn’t. Tapping that equity to add square footage keeps you in the neighborhood you chose, keeps the school district, keeps the commute, and builds the exact layout you need instead of settling for someone else’s floor plan.
Our Process, Step by Step
- 1
Phone consultation and property review. You call (559) 282-2291 and talk to a real person, not a call center. We ask about your lot, your goals for the space, and your rough budget range, so we can tell you honestly whether the project makes sense before we ever schedule a site visit.
- 2
On-site walkthrough and measurements. Troy Eastman or a senior project lead walks the property with you, measures the existing structure, reviews the setbacks and access paths, and gets a read on the soil and foundation conditions. This is where we start building the actual line-item estimate, not a ballpark.
- 3
Written price and plan review. You receive a written price that breaks down materials, labor, permits, engineering, and finishes before any work starts. If the final number doesn’t match the estimate, that’s on us, not you. You approve every line before we move forward.
- 4
Permitting and pre-construction. We submit the plans to the city, manage plan-check revisions, and schedule the trades. You get real-time updates through The Relay Visibility Guarantee, so you know exactly where the project stands without having to call and chase us down.
- 5
Build, inspect, and hand over. Our background-checked, uniformed crews complete the work, pass inspections, and walk you through the finished space. You receive before-and-after photos, a digital invoice you can pay by link, and the 365-Day Done Right Promise in writing, so you know the work is covered for a full year.
How Much Does Room Addition Contractor Cost in Woodland Hills?
A typical room addition in Woodland Hills runs $120,000 to $280,000 for site-built construction, with prefab and modular options landing between $90,000 and $220,000 depending on brand, size, and finish level. Sunrooms sit lower, usually $45,000 to $110,000. In-law suites with a kitchenette and bathroom fall in the $140,000 to $300,000 range, and garage conversions vary widely at $100,000 to $250,000 based on the condition of the existing slab and framing. The single biggest factors are foundation type, plumbing rough-in, and whether you choose site-built or prefab construction.
What affects the price most in Woodland Hills is the lot itself. Hillside parcels need more excavation and retaining work than flat lots. Older homes often need an electrical panel upgrade, which adds several thousand dollars. And a bathroom, with its sewer tie-in and waterproofing, is far more expensive per square foot than a plain bedroom. To avoid overpaying, get a line-item written estimate before you commit, and be wary of any contractor who won’t put the number on paper. A free estimate from Benson ADU Woodland Hills includes the full written breakdown, permit fees, engineering, and a clear scope of work. If the number changes after we start, the difference is on us, not you.
Our Service Area Near Woodland Hills
Benson ADU Woodland Hills serves homeowners across the west San Fernando Valley, including Room Addition Contractor in Tarzana, Room Addition Contractor in Brentwood, plus nearby neighborhoods like Canoga Park, West Hills, Winnetka, Calabasas, Reseda, Encino, Chatsworth, and Bel Air. We know how each of these areas handles permitting and hillside setbacks, and we route our crews efficiently so you’re not waiting weeks for a follow-up visit. If you’re uncertain whether your property falls in our service area, call and ask. You’ll get a straight answer.
We work with homeowners across the west Valley and into the surrounding foothills, and frankly, the best way to know if we can help is to call. If you’re considering any kind of addition, from a sunroom to a full home expansion, we’ll tell you honestly whether we’re the right fit for your parcel and your budget. No pressure, no obligation.
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 Room Addition Contractor in Woodland Hills
A room addition contractor is a licensed builder who designs, permits, and constructs new square footage attached to your existing home. If you’re nearby, our Room Addition Contractor in Canoga Park offers the same full-scope service. Benson ADU Woodland Hills handles the full scope, from architectural plans to engineering, foundation, framing, plumbing, electrical, and finish work, under one written contract. We also offer prefab and modular options through brands like Abodu and Cover when those make more sense for your lot. Call (559) 282-2291 to get a written price before any work starts.
A standard single-room addition usually takes four to eight months from the first site walk to final inspection, with prefab options running faster, often three to five months. Permitting is the wildcard, and plan-check times fluctuate by city workload, so we don’t promise dates we can’t control. What we do promise is real-time updates through The Relay Visibility Guarantee so you always know exactly where your project stands. Call (559) 282-2291 for a realistic timeline on your specific project.
A room addition in Woodland Hills typically runs $120,000 to $280,000, with prefab modular additions starting around $90,000 and sunrooms in the $45,000 to $110,000 range. Your final price depends on foundation type, plumbing requirements, and whether you choose site-built or factory-built construction. We provide a written line-item estimate before work starts, so you won’t see a change order because someone “forgot” about the electrical panel. For an exact quote, call (559) 282-2291 and schedule a free on-site walkthrough.
Yes, Benson ADU Woodland Hills is an authorized builder for Abodu and Cover, which means we handle site work, foundation, utilities, and finish work for these factory-built systems. We also build with Tuff Shed for storage and workshop applications, and use James Hardie siding and cladding materials on custom projects. If you’re comparing prefab brands, we’ll help you understand the differences in plain English and price out the option that fits your Woodland Hills lot. Call (559) 282-2291 to talk through your options.
We’re not an emergency repair service, and honestly, a room addition is a planned construction project, not something that gets rushed in a weekend. If you have water damage or a structural issue that needs immediate attention, we can refer you to a qualified partner. For planned additions, our calendar fills on a first-come basis, so the sooner you call (559) 282-2291, the sooner we can get your site walk scheduled.
The 365-Day Done Right Promise covers workmanship on every project we complete, for a full year, in writing, stamped on your contract. If something isn’t right, we come back and make it right, including a free second visit if any covered repair fails. Troy Eastman stands behind this guarantee on every Benson ADU Woodland Hills project. If a contractor won’t put their warranty in writing, that tells you everything you need to know.
Start by defining exactly what the new space needs to do, a bedroom, a suite with a bathroom, a home office, a sunroom, because that drives the entire budget. A Topanga Room Addition Contractor can help you prioritize features that fit your goals and your lot. Think about your maximum spend before you get too attached to a specific design. Then call (559) 282-2291 and schedule a free on-site walkthrough so we can check your lot, your setbacks, and your existing foundation. Having a rough idea of your goals and your ceiling number will make the first conversation much more productive.
Schedule Your Room Addition Contractor Service in Woodland Hills Today
Ready to see a written price for your Woodland Hills room addition? Call (559) 282-2291 now and you’ll reach a live person, any day, any hour. We’ll schedule your free on-site estimate, walk the property with you, and hand you a line-item written price before you commit to anything. No obligation, no pressure, no price that changes at the door. That’s the Benson ADU Woodland Hills way, backed by the 365-Day Done Right Promise and led by Troy Eastman.
Written by Troy Eastman, Owner at Benson ADU Woodland Hills, serving Woodland Hills since 2006.
