Fast, Reliable New Detached ADU Across Sherman Oaks
A new detached ADU in Sherman Oaks typically costs $280,000-$450,000 all-in, from architectural drawings through final LADBS inspection, with prefab and modular systems landing at the lower end when site conditions allow. Most Sherman Oaks projects clear permitting in 3-5 months using LADBS’s ADU Standard Plan Program, then build in 6-10 months. If you’re weighing a detached ADU on a 1950s-1970s ranch lot north of Ventura Blvd or a sloping parcel south toward the foothills, call (971) 497-2402 for a written price before any work begins.
We know Sherman Oaks block by block. The garage-to-ADU playbook here is different from anywhere else in the Valley, and we’ve spent a decade refining it.
Why Ellery ADU Studio Is Sherman Oaks’s Preferred New Detached ADU Company
Sherman Oaks homeowners call us because we write prices down before we touch a wall. That’s Haven Standard Clause 1, and it applies to every one of the 900+ ADUs we’ve designed, permitted, and built since 2015. No designer blaming the builder. No builder pointing at the designer. One contract, one written price, one accountable studio. Nadia Ellery founded this practice the year California’s ADU permitting rules shifted, and she built it around a simple premise: the permit set is the product, not an afterthought.
Our Sherman Oaks clients see that difference on day one. We show up with a documented photo record on every visit, we cite LADBS code sections by number, and we explain what the inspector will check before we ever swing a hammer. We don’t ask you to trust us. We hand you the drawings, the scope, and the warranty in writing, and we invite you to check them against any other bid in the Valley.
Scheduling for Sherman Oaks runs through our Los Angeles office, and a live person answers calls 24/7. No voicemail queue, no callback promise that evaporates.
Our New Detached ADU Services in Sherman Oaks
Every detached ADU we build in Sherman Oaks starts the same way: a site walk, a slab and framing assessment, and a written scope that names every line item before signing. Here’s what that looks like on the four most common project types we handle here.
Custom Built ADU
A custom detached ADU in Sherman Oaks runs $330,000-$450,000 for a 1-bed or 2-bed unit with full kitchen, bath, and independent utility connections, depending on site access and hillside grading. We design to your lot’s specific setbacks, no stock plan forced onto a parcel that doesn’t fit it. For hillside lots south of Ventura Blvd, we engineer the foundation, retaining, and drainage as one package so the plan survives the first LADBS review without resubmission.
Prefab ADU Installation
Prefab units from Cover, Dvele, and Mighty Buildings typically run $230,000-$310,000 installed in Sherman Oaks, including site prep, foundation, utility tie-ins, and LADBS final. We specify and coordinate these systems within our single-contract model, so the factory’s scope and the site’s scope sit in one written price. Sherman Oaks lots with alley access or a wide side yard can often take a prefab module with minimal crane time; tight flag lots need a different spec, and we’ll tell you that before you buy.
Modular ADU
Modular detached units in Sherman Oaks land between $250,000-$340,000, depending on module count and foundation type. We’ve found the biggest cost variable here is not the module itself but the site prep: many 1950s rear garages sit on slabs with no moisture barrier, and tying a modular unit into that footprint means addressing the stem wall before the module sets. We price that work up front, not as a change order after demolition.
Studio ADU
A studio detached ADU in Sherman Oaks typically runs $220,000-$290,000 with a full bath, kitchenette, and its own meter. We see these going up on the flatter lots north of Ventura Blvd where side-yard setbacks allow a 400-500 square foot footprint without a variance. If your lot is one of the wide ranch parcels near Van Nuys Blvd, a studio ADU is often the fastest path to a permitted, rentable unit.
1-Bed & 2-Bed ADU
A 1-bed detached ADU in Sherman Oaks usually runs $270,000-$350,000; a 2-bed runs $340,000-$450,000. The gap between the two is not just square footage. A second bedroom triggers additional parking and landscaping requirements under LADBS rules depending on your zone, and a 2-bed unit draws enough load that many Sherman Oaks panels need a service upgrade. We catch that in the first site visit and write it into the number you sign.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Sherman Oaks
We work with prefab and modular manufacturers including Cover, Dvele, and Boxabl, and we stock the common connection hardware and flashing details their systems call for. That means we’re not waiting on a truck from Northern California when a Sherman Oaks build hits a tolerancing issue. We carry what the site needs, and our crews are trained on each brand’s panel joints, chase routing, and foundation interface. One contract covers everything from factory specs to LADBS final, so the blame gap between manufacturer and builder disappears before it opens.
Common New Detached ADU Problems We See in Sherman Oaks Homes
- Undersized ceiling clearances in 1950s-60s rear garages. We open up a lot of detached garages off Van Nuys Blvd and Hazeltine Ave where the rough ceiling joists sit at 6’10” before drywall. Habitable space needs 7 feet clear. Out-of-area builders miss this and fail inspection; our crews do a slab dig-down or swap in low-profile LVL beams to hit code.
- Slab moisture wicking through unsealed stem walls. Valley tract garages were built as garages, not living space, and many have no vapor barrier under the slab. When we convert one, we cut and seal the stem wall before framing, which adds a line item most quotes leave out.
- HVAC sized for coastal conditions, not 105°F Valley summer days. A mini-split spec copied from a Santa Monica job will not hold code-required temperature in a Sherman Oaks August. Manual J load calculations here use 108°F design temps, and we size accordingly.
- Hillside fire-hardening requirements south of Ventura Blvd. The Santa Ana wind exposure zone triggers ember-resistant vents and Class A roofing on detached ADUs in the foothill slopes. Skipping that spec gets a stop-work order; we build it into the exterior package from the start.
Pricing for New Detached ADU in Sherman Oaks, CA
Here are the ranges we write into Sherman Oaks contracts every week. A studio ADU runs $220,000-$290,000. A 1-bed runs $270,000-$350,000. A 2-bed or custom footprint runs $330,000-$450,000. Hillside lots south of Ventura Blvd add $15,000-$30,000 for engineered foundations and grading. Those numbers include design, permit sets, LADBS fees, construction, and final inspection.
What moves the number: slab dig-downs on old garage footprints, panel upgrades for a second bedroom, fire-hardened exteriors in the hillside zone, and site access that limits crane or concrete pump reach. We identify every one of these in the first site visit and write them into the price you sign under Haven Clause 1. You will not see a change order after demo. Call (971) 497-2402 for a written estimate, or bring us any bid you already have for a Free Second Opinion.
We Also Serve Cities Near Sherman Oaks
Our crews work across the San Fernando Valley from Sherman Oaks. We handle new detached ADU builds in Sherman Oaks and the surrounding streets, plus Van Nuys, Encino, Studio City, and North Hollywood. If you’re within fifteen minutes of the 101/405 interchange, we’re on your block regularly.
Serving Sherman Oaks, CA - Our Local Coverage Area
We’re based in the Sherman Oaks 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 - New Detached ADU in Sherman Oaks
Because most quotes omit the conditions that only show up once walls open: a 6’10” garage ceiling that needs a slab dig-down, an unsealed stem wall wicking moisture, an electrical panel that cannot carry a second dwelling. A 400-square-foot studio can range from $220,000 to $290,000 depending on what’s behind the stucco. We price the full scope up front, in writing, so the number you sign is the number you pay. Call (971) 497-2402 and we’ll walk your lot before we give you a figure.
Fire-hardening requirements apply primarily to the hillside zone south of Ventura Blvd, where Santa Ana wind exposure drives ember-resistant vent and Class A roofing mandates. Flat lots north of Ventura Blvd typically don’t carry those same exterior upgrades, though LADBS may still require defensible-space landscaping depending on your lot’s proximity to the foothill interface. We’ll tell you exactly which zone your parcel falls in during the site walk. Call (971) 497-2402 for that assessment.
Yes, and we do this routinely in Sherman Oaks. The fix is a slab dig-down inside the garage footprint to gain vertical clearance, or swapping the existing joists for low-profile LVL beams that buy back the inches. It adds cost, but it’s a known quantity. On a 1958 ranch off Van Nuys Blvd, we dug the slab down, set LVL beams, and passed LADBS inspection without a single change order. Call (971) 497-2402 and we’ll tell you which approach fits your garage.
It’s real, and it’s one of the quiet advantages of building in Sherman Oaks versus neighboring cities. Sherman Oaks sits inside City of Los Angeles boundaries, so your project qualifies for LADBS’s pre-approved ADU Standard Plan Program. That can cut permitting from 6-10 months down to 3-5 months, because the drawings are already reviewed and stamped. Burbank and Culver City run their own plans and their own timelines. We prepare standard-plan submittals for Sherman Oaks projects every month. Call (971) 497-2402 to see if your lot qualifies.
Plan for $15,000-$30,000 above a flat-lot build of the same size. The slope south of Ventura Blvd toward the Santa Monica Mountain foothills requires engineered foundations, grading plans, and often retaining, plus the fire-hardening exterior package we described above. It’s not a surprise cost if you know the hillside before you design. We do. Call (971) 497-2402 and we’ll price your specific slope.
Get a Written Price for Your Sherman Oaks Detached ADU
We open up older Sherman Oaks homes and find outdated wiring, undersized framing, failed waterproofing, and the code upgrades a permit triggers once walls are open. That’s the honest reality of building in this housing stock, and it’s the single biggest reason an ADU quote moves. Our answer is simple: inspection first, allowances written into the contract, and every surprise priced and approved in writing before we touch it. Under Haven Clause 5, the scope is locked at signing. No door-side upsells, no scope creep, no designer-versus-builder finger-pointing.
Nadia Ellery founded this studio in 2015, and she still reviews every Sherman Oaks permit set before it leaves our office. Call (971) 497-2402 for a Free Second Opinion on any written estimate you already have, or to schedule your site walk and get a written price for your detached ADU.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Sherman Oaks since 2015.
New Detached ADU in Nearby Areas
