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ADU construction in Woodland Hills typically costs between $90,000 and $220,000 for a complete unit, with most homeowners landing in the $140,000 to $180,000 range for a standard one-bedroom unit of roughly 500 to 600 square feet. That figure includes architectural plans, permits, site preparation, construction, and the final interior finishes. The spread is wide because an attached conversion of existing garage space runs lower, while a detached new build with higher-end finishes pushes toward the top of the range.
If you’re just starting to compare contractors, that number is your honest starting point. Not $50,000. Not whatever a national cost estimator spits out for “Los Angeles” when it isn’t accounting for Woodland Hills site conditions, LADBS plan check times, or the current cost of trades. We write the price down before any work starts, so you don’t discover the real number at the invoice.
Key Takeaways
- Detached ADUs start around $150,000 in Woodland Hills; garage conversions can run $90,000 to $125,000 if the existing slab and framing are sound.
- Site work, utility connections, and architectural drawings typically account for $20,000 to $35,000 before a single wall goes up.
- Permit fees and city requirements in Los Angeles add roughly $5,000 to $12,000 depending on scope and school district fees.
- Construction alone runs 7 to 14 months from permit approval to final inspection.
- Written pricing from Sawyer Remodel Woodland Hills includes the full scope; no change-order surprises at rough-in.
We’ve been building in Los Angeles since 2005. Luca Romano leads the Woodland Hills location, and every estimate he writes reflects real subcontractor pricing, real lumber and concrete costs, and real permit timelines for this specific ZIP code. That’s what the range above is based on. Not a national average.
ADU Construction Cost Breakdown (2026)
Here’s where the money actually goes on a typical Woodland Hills ADU. We’re using a 500-square-foot detached one-bedroom unit as the reference model, since that’s what most owners in the area build.
| Cost Component | Typical Range | Notes |
|---|---|---|
| Architectural & structural plans | $6,000 – $15,000 | Includes title 24 energy calcs, structural engineering, and LADBS plan check revisions. |
| Permits & city fees | $5,000 – $12,000 | Los Angeles Department of Building and Safety fees plus LAUSD school district fees, which apply to most ADUs. |
| Site preparation & demolition | $8,000 – $20,000 | Grading, tree root removal if needed, old slab demo for garage conversions, erosion control. |
| Foundation & slab | $10,000 – $18,000 | Post-tension slab or raised foundation depending on soil report. Hillside lots in the Santa Monicas can push this higher. |
| Framing & structural | $20,000 – $35,000 | Lumber package, shear wall, roof structure. Woodland Hills is in a seismic zone; hold-down and shear requirements add cost. |
| Roofing | $4,000 – $9,000 | Composition shingle is the budget move; flat TPO roofing on modern designs costs more. |
| Plumbing | $8,000 – $18,000 | New sewer lateral tap or tying into existing line, water supply run, gas line for water heater or range. |
| Electrical | $7,000 – $15,000 | New panel or sub-panel, wiring, fixtures, LADWP service requirements, solar-ready provisions. |
| HVAC | $5,000 – $12,000 | Ductless mini-split is the standard choice. Valley summer heat makes efficient cooling non-negotiable. |
| Insulation & drywall | $4,000 – $8,000 | Title 24 energy code compliance is mandatory. Woodland Hills summers mean insulation upgrade is worth every dollar. |
| Interior finishes | $12,000 – $30,000 | Flooring, kitchenette, bathroom fixtures, paint, trim. Budget tier: stock cabinets and vinyl plank. High tier: custom cabinets and tile. |
| Appliances & fixtures | $3,000 – $10,000 | Refrigerator, range, washer/dryer hookups, water heater. Tankless runs more upfront, saves space. |
| Site utilities & connection fees | $3,000 – $8,000 | Gas meter upgrade, electrical panel tie-in, sewer connection. |
Add those up and you land between $90,000 on the lean end and $220,000 for a well-appointed detached unit with premium finishes on a tricky lot. That’s the honest math. Anyone quoting below $90,000 for a permitted detached ADU in Woodland Hills is either not including permits, not including finishes, or not planning to finish the job.
What Drives the Price Up
- Hillside lots. Woodland Hills has plenty of them. A sloped site means retaining walls, pad grading, deeper foundations, and sometimes a soils report recommending caissons. That alone can add $20,000 to $40,000.
- Garage conversion surprises. The garage looked fine from the driveway. Then we open the walls and find an unpermitted addition from 1987, termite damage in the sill plate, or a slab that’s 2 inches thick instead of 4. Budget for $5,000 to $15,000 in unknown-unknowns on any conversion.
- Utility line distance. If your main electrical panel is on the opposite side of the property from the ADU site, expect a trench, conduit, and likely a panel upgrade. That’s $4,000 to $10,000.
- Finishes. Homeowners pick the Cambria countertop and the Grohe fixtures; tenants pick stock. There’s a $15,000 difference between those two buildings and both are correct choices depending on your goal. We install both.
What Brings the Price Down
- Converting instead of building new. An attached garage conversion or bump-out ADU uses existing foundation, framing, and one existing wall. You skip the site prep and foundation line items entirely.
- Standardized plans. If you can work with a pre-drawn plan set that we’ve already built before, you save $3,000 to $6,000 in architectural fees and weeks in plan check.
- Careful fixture selection. Kohler and Moen make excellent faucets at the $200 price point. You don’t need the $800 fixture to get a quality build. We’ll show you the options and let you choose.
- Locking the scope early. The biggest budget killer on any Los Angeles project is the change order. With our written-price approach, the scope is set before demo starts, so the number you approve is the number you pay.
For a broader look at what an ADU project involves, see our page on ADU Construction in Woodland Hills.
What Affects ADU Construction Pricing in Woodland Hills
Woodland Hills isn’t just “Los Angeles.” The ZIP codes here, the hillside conditions, the age of the housing stock, and LADBS district office realities all shape what an ADU costs. Here are the local factors that move your number.
- Seismic and soils requirements. Woodland Hills sits near the Northridge fault zone. Structural engineering for ADUs reflects that. Shear walls, hold-down anchors, and foundation design are not optional line items. Expect your engineer to spec more than a contractor building in the flatlands of the Valley below.
- Hillside grading and retaining walls. South of Ventura Boulevard, lots climb into the Santa Monica Mountains. A pad-level ADU on a flat lot in Walnut Acres is a different project than one on a downslope lot off Mulholland. Retaining walls and drainage add real money, and skipping them is an expensive gamble in a wet El Niño year.
- Access to the build site. If a concrete truck can back right up to the foundation, great. If your backyard is accessed only through a 3-foot side gate, materials get hand-carried or pumped. That labor cost shows up in the framing and concrete line items.
- Age of existing utilities. Many Woodland Hills homes were built in the 1960s and 1970s. The original 100-amp panel is usually maxed out. An ADU with a mini-split, electric range, and washer/dryer will push past that. Budget for a 200-amp upgrade or a sub-panel, which is both a building code issue and an LADWP service change.
- Permit and plan check timelines. LADBS plan check times vary by office and by project complexity. A simple garage conversion might clear in 4 to 6 months. A detached ADU with a hillside soils report can take 9 months before you pull a permit. That’s not a cost line item per se, but it affects your carrying costs if you’re financing.
- Setback and lot coverage rules. The 4-foot rear and side yard setback rule under state ADU law helps, but Woodland Hills has many lots with unusual shapes, easements, or protected oak trees. A protected oak can shift your ADU envelope and add design complexity. We work around these constraints all the time, but they do affect cost.
Luca walks every Woodland Hills site before writing a proposal. He wants to see the access, the panel, the slope, and the existing sewer location before he puts a single number in writing. That’s why our estimates don’t get revised at the rough-in stage.
How to Save on ADU Construction
You can cut $30,000 to $60,000 off an ADU project without cutting quality. Here’s where the smart money gets saved.
- Start with the utility math. Before you commit to an ADU location, check the distance from your main electrical panel and sewer line to the proposed footprint. Moving the ADU 20 feet closer to the panel can save $5,000 in trenching and copper. We do this analysis as part of our free estimate.
- Convert before you build new. If the garage has a solid slab and the framing is in decent shape, a conversion will almost always beat a detached build on price. You keep the foundation and roof structure, and the city often processes these faster. We’ve completed garage conversions in Woodland Hills for $90,000 to $120,000 where a comparable detached unit would have run $160,000.
- Use standard plan sets. The pre-approved plan route is real in Los Angeles, but even outside that program, we have plan sets we’ve built before. Reusing drawings saves architectural fees and shortens plan check. That’s real money and real months.
- Pick finishes like a landlord, not a homeowner. If this ADU is for rental income, choose durable and simple: LVP flooring, quartz counters from Cambria’s value tier, Moen fixtures, stock cabinetry. The rent doesn’t change because you picked the $4,000 countertop slab.
- Bid the whole project at once. If you’re also doing the main-house remodel, combine it. Shared mobilization, shared dumpster, shared plan check, and one contractor managing both scopes. That coordination alone saves $10,000 to $20,000 versus two sequential projects.
The most reliable way to save is to get a written price from a contractor who actually builds in Woodland Hills. Our estimates are free. Call (341) 217-2776 and Luca will walk the site, run the utility math, and give you a number in writing. No deposit, no pressure, no obligation.
If you’re weighing the ADU against other upgrades, our home page has a full overview of what Sawyer Remodel Woodland Hills builds.
Who Is Sawyer Remodel Woodland Hills?
Sawyer Remodel Woodland Hills is part of the Relay Home Co. family of independent local remodeling businesses, operating since 2005. Luca Romano leads the Woodland Hills location. Every project runs under The Relay Visibility Guarantee: a live arrival time before we show up, photo updates before and after, and a written price before a single tool is picked up. The number on your estimate is the number on your invoice. If the scope changes, the price change is agreed in writing before we proceed.
Our 365-Day Done Right Promise means exactly what it says: if it’s not done right, we make it right, for a full year after the project closes. That’s in writing on every job.
On ADU projects, we bring background-checked, uniformed technicians, material partners that include KraftMaid and Wellborn cabinetry, Cambria and Caesarstone countertops, Kohler and Toto fixtures, and GAF and James Hardie exteriors. You’ll know who’s walking onto your property, when they’ll arrive, and what they’re doing that day.
ADU Construction Timeline in Woodland Hills
Realistic timeline from signed contract to move-in: 10 to 18 months. Here’s how it breaks down in this market.
- Design and engineering: 4 to 8 weeks for drawings, structural calcs, Title 24 energy compliance.
- Plan check at LADBS: 3 to 6 months depending on project complexity and the specific district office. Hillside and custom plans take longer.
- Permit issuance: 2 to 4 weeks after plan check approval and fee payment.
- Site prep and foundation: 3 to 6 weeks depending on access and grading.
- Framing and rough-in: 6 to 10 weeks for framing, roofing, plumbing, electrical, and HVAC.
- Insulation, drywall, finishes: 6 to 10 weeks.
- Final inspection and occupancy: 2 to 4 weeks after final inspection and LADBS sign-off.
Weather delays happen in the Valley. Rain slows foundation pours in winter. Heat doesn’t slow us much, though we start framing early in summer months on exposed lots. If you’re planning a rental unit, start the process 18 months before you want tenants in.
FAQs – ADU Construction Cost
Is it cheaper to build an ADU or convert my garage in Woodland Hills?
A garage conversion in Woodland Hills typically costs $90,000 to $125,000, while a detached new-build ADU starts around $150,000 and runs up to $220,000. The garage conversion reuses the foundation, exterior walls, and roof structure. But don’t assume your garage is a conversion candidate; if the slab is cracked or the framing has termite damage, the savings shrink. Call (341) 217-2776 and we’ll look at what you actually have.
How much does a detached ADU cost per square foot in Woodland Hills?
Expect $300 to $450 per square foot for a detached ADU, so a 500-square-foot unit lands between $150,000 and $220,000. The lower end assumes simple finishes and a flat lot; the higher end reflects hillside engineering, premium finishes, and longer utility runs. Per-square-foot costs are higher for smaller units because fixed costs like permits, plans, and utility tap fees don’t shrink with square footage.
What’s the cheapest ADU to build in Woodland Hills?
The cheapest compliant option is a converted garage with a modest bathroom and kitchenette, typically $90,000 to $120,000 when the structure is sound. The next step up is a one-bedroom detached unit on a flat lot with stock finishes at roughly $150,000. Anything below $90,000 that claims to be a permitted ADU in this area should raise questions; our written estimates show where every dollar goes. Call (341) 217-2776 for a free site evaluation.
How long does ADU construction take in Woodland Hills?
Plan for 10 to 18 months from signing a contract to move-in, with plan check at LADBS being the single biggest variable at 3 to 6 months. The construction phase itself is typically 5 to 8 months once permits are issued. We give you a written timeline with the written price, and you get photo updates at every milestone under The Relay Visibility Guarantee.
Do I need permits for an ADU in Woodland Hills?
Yes. Every legal ADU in Los Angeles requires building permits, and skipping them means an unpermitted unit that creates problems at resale, with insurance claims, and with the city. A permitted ADU requires plans, structural calculations, title 24 energy compliance, and sign-off from LADBS. We handle the entire permit process as part of the project scope. The $5,000 to $12,000 permit line item is not optional if you want the unit to be legal.
Can you build an ADU on a hillside lot in Woodland Hills?
Yes, but plan for $20,000 to $40,000 in additional grading, retaining walls, and foundation work compared to a flat lot. South of Ventura Boulevard, many sites require a soils report and possibly caisson foundations depending on slope and soil type. We’ve built on these lots and we’ll tell you the real number for your specific property before you commit. Our estimates are free, so you can call (341) 217-2776 and get the real cost of a hillside ADU for your specific address.
Get a Written Price for Your Woodland Hills ADU
You should not have to call a contractor just to learn whether the project is even in your budget. That’s backwards. So here’s the number: $90,000 to $220,000 for a permitted ADU in Woodland Hills, with most projects landing between $140,000 and $180,000.
What you should call for is the specific number for your lot, your panel, your sewer line, and your access. Luca will come out, walk the property, and hand you a written estimate that includes the full scope. No vague allowances. No missing permit line. No number that changes at rough-in.
Sawyer Remodel Woodland Hills has been building in the Los Angeles market since 2005. The 365-Day Done Right Promise, the written price before work starts, and the photo updates during the build are standing commitments on every job we take. Call (341) 217-2776 for a free ADU construction estimate.
Written by Luca Romano, Owner at Sawyer Remodel Woodland Hills, serving Woodland Hills since 2005.
Pricing reflects the Woodland Hills market as of 2026. Sawyer Remodel Woodland Hills offers free estimates – call (341) 217-2776.
What Our Customers Say
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