A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted ADU Builders for Woodland Hills Homeowners
Adding an accessory dwelling unit in Woodland Hills means navigating a tangle of city setback rules, hillside grading requirements, and the reality that your lot was likely platted when Eisenhower was president. Most families spend weeks on Google trying to figure out whether they can even build. We give you a straight answer, in writing, before you spend a dime. Ben Ortega leads our ADU Builders in Woodland Hills, and every project starts the same way: a written price for the entire build, a crew that shows up in uniform with shoe covers and drop cloths, and a 365-Day Done Right Promise that covers the finished ADU, garage conversion, or home addition. Call (559) 249-3776 to schedule a free on-site assessment.
ADU Construction
ADU Construction is the full process of building a new living unit on your existing Woodland Hills property, from the first site survey to the final coat of paint and the certificate of occupancy. In Woodland Hills, this typically means a detached unit in the backyard, a garage conversion, or an attached addition with its own entrance. A complete ADU construction project in this area generally runs between $180,000 and $350,000 depending on size, site conditions, and the finish level you choose. What we do differently at Seedling ADU Woodland Hills is hand you the written price before any work starts. That number includes the permits, the foundation, the wiring, the fixtures, and the walkthrough at the end. If we find something unexpected during construction, we tell you before we touch it, never after the bill arrives.
Site Assessment and Feasibility Checks
Before a single tool leaves the truck, we walk your Woodland Hills lot with a surveyor and check slope, soil, access for equipment, and how the unit will sit relative to your existing home. These details matter more in the hills than in flat parts of the Valley. A lot on a 15-degree grade in the south end of Woodland Hills creates very different foundation and drainage requirements than a flat parcel near the Boulevard, and our written price reflects what we actually find, not a generic number from a brochure.
Permits, Plans, and Approval Pathway
We handle every page of the paperwork with the City of Los Angeles Department of Building and Safety. That includes the plot plan, structural drawings, Title 24 energy compliance, and all the revisions the plan check requires. You get a clear timeline for when the permit set goes in and when you can expect approval, so there is no mysterious waiting period where nobody calls you back.
Detached ADU
A Detached ADU is a freestanding structure with its own foundation, its own roofline, and its own address in the building department records, built in the rear or side yard of your Woodland Hills home. Detached ADU construction in Woodland Hills typically costs $220,000 to $400,000 because the work includes a full foundation, separate utility trenching, and all the finishes of a small house. We build detached units across the neighborhood, from ranch-style backyards off Serrania Avenue to hillside lots above Mulholland where drainage and retaining walls become part of the conversation, and we also serve homeowners looking for ADU Builders - Tarzana. Our team coordinates the grading, the trenching from your main panel to the new structure, and every inspection, and you still receive the written price before any dirt moves.
Foundation and Utility Runs
A detached unit means excavating, forming, and pouring a foundation, then running new electrical, water, and sewer lines from your main house or the street. In older parts of Woodland Hills, the main panel often needs an upgrade to handle the added load, and we include that in the written price instead of letting it surface as a surprise. The trenching across your yard is done carefully, with the path fenced off and the soil restored after the lines are in.
Yard Access and Family Life During the Build
Because the unit is separate from your house, your family can keep living normally while we work. The crew enters through a designated side path, not your front door, and we keep the work area contained with temporary fencing and daily cleanup. If you have children or pets, you will know exactly which part of the yard is off limits and for how long, and the crew stops work at a set time every day so dinner and bedtime stay on schedule.
JADU
A JADU is a Junior Accessory Dwelling Unit, a smaller unit created entirely within the existing walls of your home, usually from a spare bedroom, a garage attached to the house, or a large utility room in Woodland Hills. A JADU in Woodland Hills generally costs $80,000 to $160,000 because it uses your existing foundation, roof, and most of your existing plumbing and electrical. It needs its own entrance, a small kitchenette, and either its own bathroom or direct access to a shared one. Seedling ADU Woodland Hills handles the conversion from start to finish, including the wall adjustments, the kitchenette build, the sound separation between the main house and the JADU, and the final inspection. You get the written price before we cut the first stud, and the 365-Day Done Right Promise covers the finished unit.
Working Inside the Home, Carefully
Because a JADU is built inside your existing floor plan, the work happens where your family lives. That is exactly where the Cedarwell Care Promise comes in. Shoe covers and drop cloths on every visit, pet-safe products wherever there is a choice, and a photo of the cleaned-up work area sent to you before the crew leaves each day. We schedule noisy work around your kids’ naps and school hours whenever we can, and we tell you the day before anything disruptive happens.
Entrance and Separation Details
A proper JADU needs a private entrance and a real sense of separation from the rest of the house. We typically build a solid wall where a shared hallway used to be, add an exterior door, and install insulation in the shared walls and ceiling so the JADU tenants and your family do not hear every conversation. These details are not optional extras. They are part of the written price from day one.
ADU Plans
ADU Plans are the architectural and engineering drawings that the City of Los Angeles requires before any accessory dwelling unit can be permitted and built in Woodland Hills. They are not a sketch on a napkin. A complete plan set includes a site plan, floor plan, elevations, foundation details, structural calculations, Title 24 energy documents, and a lot of small notes that tell the inspector exactly what the contractor is supposed to build. You need ADU plans before you can pull a permit, and you need them before any lender will talk to you. Plan sets for a Woodland Hills ADU typically cost $4,000 to $9,000 as part of a full design and permitting package, though it varies significantly by scope. Our team works with the plan designers and engineers who know LA Department of Building and Safety submittal standards, so the plan check does not stall out over easily avoidable corrections.
What a Full Plan Set Includes
The drawing package covers every page the plan checker will look at: existing and proposed site conditions, floor plans with dimensions, exterior elevations from all four sides, a roof plan, foundation and framing plans, electrical and plumbing layouts, and the energy compliance forms. If your Woodland Hills property is in a hillside grading area, the plans also include soil and drainage notes, which are not optional. Missing any of these pages adds weeks to the approval timeline, and we submit complete sets the first time.
Design Options That Match Your Lot
Not every plan works on every Woodland Hills lot. A long, narrow parcel behind a 1950s ranch needs a different footprint than a wide corner lot near the Boulevard. We help you decide between a detached unit, an attached addition, or a garage conversion based on the actual dimensions of your property and the setback rules that apply to your specific zoning. That conversation happens before the drawings start, so you do not pay for a design that the city will not approve.
ADU Contractor
An ADU Contractor is the licensed professional who takes the approved plans and turns them into a finished, occupied living space, coordinating every trade, inspection, and material delivery along the way. In Woodland Hills, the contractor is the single point of contact for the framing crew, the electrician, the plumber, the roofer, the drywall team, the tile setter, the painter, and the inspector. You do not hire each of those people yourself. You hire the contractor, and the contractor manages everything else. A good ADU contractor in Woodland Hills will handle your project for $180,000 to $400,000 depending on size and scope, and that number should be fixed before the work starts. If it is not fixed, you are financing someone else’s estimating problem. At Seedling ADU Woodland Hills, the written price is a promise, not a guess, and every job is backed by our 365-Day Done Right Promise.
The Single Point of Contact
When you hire us, you get our direct line, and a live person answers it around the clock. Not a voicemail tree. Not a call center in another state. During your build, the person who picks up the phone knows your project, your schedule, and where things stand that week. If you have a question at 8:00 on a Tuesday night about the tile delivery, you get an answer from someone who has actually walked your job site.
Crew Standards and Daily Conduct
Every person who steps onto your Woodland Hills property is background-checked and wears a Seedling uniform. That means you always know who is supposed to be there. The crew arrives at a stated time, works the stated hours, and leaves the site broom-cleaned with a photo sent to you before we go. No loose nails in the driveway, no debris stacked against your fence, no music you can hear from inside your house.
ADU Design
ADU Design is the process of shaping the size, layout, materials, and finishes of your accessory dwelling unit before construction begins, so the finished space matches how you actually plan to use it. In Woodland Hills, good design also accounts for how the unit sits on the lot, how it catches afternoon light, how it handles the summer heat without running the air conditioner at full blast, and how it looks from the street so it feels like it belongs with the existing house instead of landing there like a shipping container. Design costs run roughly $3,000 to $7,000 as part of a full plan package, which includes revisions until the layout is right. We do not charge by the hour for design changes during the planning phase. The goal is to get the design right before the first inspection, because changing a wall after framing is underway costs real money and we would rather not spend yours.
Layout and Daily Use
A 500-square-foot ADU lives very differently than a 900-square-foot one, and the layout determines whether it feels like a real home or a hotel room with a kitchenette. We walk through the intended use: will a parent be living there, will you be renting it out, will adult kids be using it for a few years? The answers change where the bedroom goes, how the storage works, whether there is a stackable laundry, and how large the kitchen really needs to be. Woodland Hills renters expect full kitchens and private outdoor space, not a wet bar and a hot plate.
Material Choices for Woodland Hills Weather
Summers in Woodland Hills are hot, and your ADU will need insulation, window placement, and exterior materials that hold up under direct sun without fading or baking the interior. We specify dual-pane windows, insulated exterior walls, and roofing materials that reflect heat instead of absorbing it. James Hardie siding is a common choice on our projects because it stands up to the dry Valley heat and looks like real wood without the maintenance. These choices are built into the plan and the price, not added later as upgrades.
Backyard ADU
A Backyard ADU is a detached living unit built in the rear yard of your Woodland Hills property, with its own private entrance and a small patio or deck space that gives the occupant a front door of their own. Backyard ADU construction in Woodland Hills typically runs $200,000 to $380,000 depending on size, foundation requirements, and how far utilities need to be extended from the main house. These units are popular here because the lots are wide enough to accommodate them while leaving plenty of yard for the main house, and in the hills, a well-placed backyard ADU can capture views that the main house never had. We build them with the same care as a full home, because that is what they are. A small home on your lot, built to last, with its own address and its own future.
Placement and Outdoor Space
Where the unit sits matters as much as the unit itself. We look at the angle of the existing house, the position of the afternoon sun, the natural drainage path across your property, and the way you use your yard today. In a lot of Woodland Hills backyards, the smart placement is along the rear property line with the entry facing the main house, creating a small courtyard feel between the two structures. In other yards, a side placement preserves more open lawn. We walk the lot with you and talk through the trade-offs before anything is drawn.
Prefab and Custom Build Paths
Some Woodland Hills homeowners want a site-built backyard ADU framed stick by stick. Others want a prefab unit from a manufacturer like Abodu or Cover, which can shorten the on-site construction time significantly and deliver a highly controlled finish. We also work with families seeking Canoga Park ADU Builders. We build both ways. Our team has direct access to prefab units from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, and Plant Prefab, as well as materials like Tuff Shed structures and James Hardie siding. You choose the path that fits your budget and timeline, and we handle the foundation, utilities, and finishes either way.
Brands We Service
We work directly with Abodu on a regular basis for homeowners who want a prefab backyard unit with a modern design and a faster on-site schedule. Abodu units arrive largely complete, and our team handles the site preparation, foundation, utility connections, and the final details that turn a manufactured module into a permitted, inspected home. We know their spec sheets, their tolerances, and exactly what the LA plan checker will ask for.
Cover builds panelized homes with an impressive level of precision, and we have built several in the Woodland Hills area. The panel system means the structure goes up quickly, and our crews handle the assembly with the same care they bring to a site-built frame. For families who want James Hardie siding, we specify and install it on both site-built and panelized projects because it holds up in the Valley sun and looks appropriate next to traditional Woodland Hills homes. Whether you have an Abodu, a Cover, a custom build, or any other make, we can help you plan it, permit it, and build it.
Signs You Need a Pro Right Now
- Your garage has been “almost converted” for three years. Maybe you started clearing it out in 2021 and the boxes are still there. A half-finished conversion is worse than no conversion. The exposed wiring, unpermitted walls, and missing insulation are not going to fix themselves, and the city can flag an unpermitted conversion during any other inspection on your property. A professional can assess what is salvageable and what needs to come out.
- You received a notice from the city or an HOA about an unpermitted structure. This happens more often in the hills than people expect, usually triggered by a neighbor complaint or a satellite imagery sweep. The letter is not the end of the world, but it means the clock is running. A licensed contractor who understands LA Department of Building and Safety procedures can help you get the structure legal or remove it before fines escalate.
- Your adult child or parent needs to move in, and the timeline is now. When a family member’s living situation changes, the need for an ADU stops being theoretical. A JADU conversion from an existing bedroom can be completed faster than a full detached build, and starting the plans now means you are not still talking about it a year from now.
- The quote you have does not include permits, utilities, or site work. A low bid that excludes the foundation, the trenching, the panel upgrade, and the permit fees is not a low bid. It is a partial bid designed to get a signature, and the change orders arrive right after the first inspection. If your contract is not a fixed written price that names every one of those items, get a second opinion before you sign anything.
- You are planning to rent the unit, and the numbers depend on getting it right. Woodland Hills rents for a well-built ADU are strong, but a unit that is dark, cramped, or feels like a converted shed does not command the same rent. The difference between a unit that rents in a week and one that sits empty is usually visible in the layout and the finishes. A professional design conversation early on protects the rental income you are counting on.
Our Process, Step by Step
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On-site walkthrough and honest feasibility. We walk your Woodland Hills property with you and talk about what is actually possible under the zoning, the setback rules, and the physical conditions of your lot. You leave this conversation knowing whether a detached unit, attached addition, or JADU is the right fit, and what the realistic budget range is. No drawings yet, no obligation, and the visit is free.
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Design and plan development with your input. Once you decide to move forward, the design team drafts the floor plan, elevations, and site plan based on how you will actually use the unit. We sit with you through the revisions until the layout is right. The design work is part of the overall plan package, not a separate hourly meter running in the background.
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Written fixed price before work begins. After the plans are developed, you receive a written price that covers the entire job: permits, site work, foundation, framing, electrical, plumbing, finishes, and the final walkthrough. This is not an estimate with a disclaimer. It is the number we build to, and it does not change unless you change the scope.
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Construction with daily communication and the Cedarwell Care Promise. During the build, our background-checked, uniformed crew works on a schedule you know in advance. Shoe covers and drop cloths inside the home, pet-safe products where there is a choice, and a cleanup photo sent to you before the crew leaves each day. A live person is available by phone 24/7 for the entire project.
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Final inspection, walkthrough, and the 365-Day Done Right Promise. We walk the finished unit with you and note every item that needs attention before the final handoff. Once everything is right, you get the keys. If anything is not done right within the first year, we make it right. That is the promise, in writing, on every ADU, garage conversion, and home addition we build in Woodland Hills.
How Much Does ADU Builders Cost in Woodland Hills?
A typical detached ADU in Woodland Hills runs $220,000 to $400,000. A garage conversion usually lands between $120,000 and $200,000, and a JADU built inside the existing home is closer to $80,000 to $160,000. These ranges reflect the reality of building in this specific market: hillside grading requirements on some streets, the cost of trenching utilities across older lots, current Los Angeles permit fees, and the finish levels that Woodland Hills homeowners expect. A unit built for a family member with solid-surface counters and a full kitchen costs more than a simple studio, and that difference is visible in the final price.
Several factors move the number. Lot slope is the big one in the hills. A flat parcel in the southern part of Woodland Hills is cheaper to build on than a graded hillside lot that needs retaining walls and drainage engineering. Utility distance matters too: the farther the trenching from the main panel and the sewer line, the more the site work costs. Size is an obvious driver, but so is the finish package. Custom cabinetry, stone countertops, and designer tile all add cost. A free estimate with us includes a written breakdown of where every dollar goes before you sign anything, which means there are no surprise line items once the crew arrives.
Our Service Area Near Woodland Hills
We serve homeowners throughout Woodland Hills and the surrounding neighborhoods, including Van Nuys, Canoga Park, West Hills, Tarzana, Winnetka, Calabasas, Reseda, Encino, Chatsworth, Topanga, and Panorama City. If you are not sure whether we cover your street, call us and ask. Our home page has more about how we work, and the ADU Builders in Woodland Hills page covers our full scope in this area. We are based nearby, which means assessments and estimates happen on your schedule, not a distant regional office’s.
Serving Woodland Hills, CA - Our Local Coverage Area
We’re based in the Woodland Hills area and know this community well, and we also serve as our ADU Builders in Topanga. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About ADU Builders in Woodland Hills
ADU builders manage the entire process of adding a living unit to your Woodland Hills property, from the first site assessment through the final certificate of occupancy. That includes the design, the permit drawings, the construction, the trade coordination, and the inspections. A full-service ADU builder is the single point of contact for the whole project, so you are not hiring and scheduling six different subcontractors yourself. At Seedling ADU Woodland Hills, the written price covers the whole scope before work begins.
A detached ADU in Woodland Hills typically takes 8 to 14 months from the first design meeting to the final inspection, with the permitting phase and the construction phase roughly splitting that time. Garage conversions and JADUs are usually faster, often 4 to 8 months. The city plan check timeline varies by workload, and we give you an honest schedule before we start rather than a best-case number that slips later. Call (559) 249-3776 and we can give you a realistic timeline for your specific lot and project type.
A complete detached ADU in Woodland Hills generally costs $220,000 to $400,000, while garage conversions run $120,000 to $200,000 and JADUs run $80,000 to $160,000. The spread depends on site conditions, size, finishes, and how far utilities need to travel from the main house. We provide the exact written price for your project before any work starts, so the number you sign is the number you pay. Free estimates include the line-item breakdown.
Yes, we have direct access to Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie materials, and we build both prefab and site-built ADUs. If you want a prefab unit, we handle the foundation, utility hookups, permitting, and all the finishing work around it. If you would rather build from the ground up, we do that too. The choice depends on your lot, your timeline, and your budget, and we walk you through the trade-offs honestly.
During an active build, a live person answers our phone 24 hours a day, seven days a week. If something comes up at night or on a weekend, you talk to a person who knows your project, not a voicemail system. For completed units, the 365-Day Done Right Promise covers any workmanship issue that comes up in the first year. We make it right, in writing, every time.
Every ADU, garage conversion, and home addition we build is covered by the 365-Day Done Right Promise. If something is not done right in the first year after completion, we return and make it right at no cost to you. This promise is in writing and is not tied to a list of exclusions or fine-print carve-outs. It also applies whether you build site-built or prefab, because we stand behind the entire project regardless of the construction method.
Start by gathering any existing survey, title report, or site plan you may have, and clear a path to the area where the unit will go. We handle the rest: the city research, the permit documents, the design, and the construction planning. If you have a garage that is currently used for storage, start thinking about what you want to keep, because a garage conversion means finding new homes for those items. Call (559) 249-3776 and we will walk you through a simple preparation checklist for your specific property.
Schedule Your ADU Builders Service in Woodland Hills Today
Call (559) 249-3776 to schedule a free on-site assessment with the Seedling ADU Woodland Hills team. You will get a written price before any work begins, a crew that follows the Cedarwell Care Promise every day, and the 365-Day Done Right Promise in writing when the build is complete. Ben Ortega and the team are ready to walk your lot and give you honest answers.
Written by Ben Ortega, Owner at Seedling ADU Woodland Hills, serving Woodland Hills and the surrounding San Fernando Valley.
