New Detached ADU in Sherman Oaks - Design, Permits and Build Under One Contract

Fast, Reliable New Detached ADU Across Sherman Oaks

A new detached ADU in Sherman Oaks typically costs $220,000-$480,000 all-in, from permit set through final inspection, with flatland parcels north of Ventura Boulevard landing at the lower end and hillside lots south of Ventura requiring additional grading and fire-hardening that pushes costs higher. Most projects move from signed contract to permit issuance in 8-12 weeks, then construction runs 16-24 weeks depending on utility complexity. We’re Ellery ADU Studio, and our crews serve Sherman Oaks from our Los Angeles office, with Nadia Ellery’s team having designed, permitted, and built more than 900 ADUs since 2015. Call (424) 407-8266 to schedule your free estimate - every project gets a written price before any work starts, per Haven Standard Clause 1.

Call (424) 407-8266

Why Ellery ADU Studio North Hollywood Is Sherman Oaks’s Preferred New Detached ADU Company

We’ve worked the 91403 and 91423 zip codes long enough to know which parcels back up to Very High Fire Hazard Severity Zones and which don’t, and that local knowledge saves our clients from permit delays that generic contractors miss entirely. Our documented photo record on every visit means Sherman Oaks homeowners see what we found - original Orangeburg sewer laterals, 100-amp panels, hillside creep - not a summary of how we felt about it. Under Clause 5 of The Haven Standard, the scope is locked at signing; no door-side upsells, no scope creep. A live person answers our phone 24/7, and we offer a Free Second Opinion on any written estimate already in hand.

Our 365-Day Done Right Promise is backed in writing before the project starts: if the finished ADU is not built to the permitted drawings, we make it right. That’s not a tagline. It’s a clause.

Our New Detached ADU Services in Sherman Oaks

Custom Built ADU

Custom built ADUs in Sherman Oaks run $280,000-$480,000 all-in for flatland parcels, with hillside lots south of Ventura Boulevard adding 20-30% for grading, retaining walls, and fire-resistant construction. We design the permit set in-house, pull LADBS permits ourselves, and build with our own crews - one contract, one written price. On a recent project near Noble Avenue, we scoped a full utility upgrade after discovering original galvanized supply lines and a 100-amp panel that couldn’t handle the ADU load. We priced that in upfront, not as a change order later. That’s Haven Standard Clause 1: written price before any work starts.

Prefab ADU Installation

Prefab ADU installation in Sherman Oaks typically costs $220,000-$350,000, with units from Abodu, Cover, and Dvele arriving crane-set after we prepare the foundation and utility stub-outs. The Valley floor’s wide side yards and flat backyards - common on those 7,000-10,000 sq ft lots - make crane access straightforward on most parcels north of Ventura. We coordinate the prefab delivery, LADBS inspection, and final tie-ins under the same single contract, so the manufacturer and our field crew share accountability. Properties in VHFHSZ zones still need county fire clearance even for prefab units; we handle that in the permit phase, not after delivery.

Modular ADU

Modular ADUs in Sherman Oaks range $240,000-$380,000 and differ from prefab in that they’re built to California’s factory-built housing code, not site-built standards, which can streamline LADBS approval for certain designs. We specify and coordinate modular systems from Mighty Buildings and other approved manufacturers, then handle site prep, foundation, utility connections, and final inspection ourselves. The San Fernando Valley heat pocket - those 105-110°F summer days - means we specify mini-split capacity carefully; undersizing is a habitability failure here, not an inconvenience. Our permit set includes mechanical load calculations for Sherman Oaks conditions, not generic LA County assumptions.

Studio ADU

Studio ADUs in Sherman Oaks run $220,000-$320,000 and suit homeowners who want rental income or family space without the footprint of a full bedroom addition. On the flat Valley floor, these often fit neatly behind existing ranch homes with minimal grading. The 1950s-1970s housing stock’s wide driveways and detached garages create natural access paths for construction equipment. We design studio ADUs with full kitchens and bathrooms to LADBS standards, and we pull all permits ourselves. Every studio project includes the documented photo record - you’ll see the trench for the sewer lateral, the panel upgrade, the fire-hardening details if required.

1-Bed & 2-Bed ADU

One-bedroom detached ADUs in Sherman Oaks typically cost $260,000-$380,000; two-bedroom units run $320,000-$480,000. The bedroom count drives utility sizing - more occupants means more electrical load, more hot water demand, and often a larger sewer lateral. On 1950s ranch homes, we regularly find 100-amp panels and 3/4-inch gas lines that won’t serve a 2-bed unit without upgrade. We scope that in the initial walkthrough, photograph what we find, and price it in the written quote. No surprises at rough-in. Haven Standard Clause 5.

Trusted Brands We Service in Sherman Oaks

We specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, and Mighty Buildings, integrating them into our single-contract design-build model. For site-built ADUs, we use James Hardie siding and other fire-resistant materials where LADBS or LA County Fire requires them - increasingly common south of Ventura Boulevard. Our crews don’t just install these brands; we understand their structural and utility requirements well enough to catch conflicts before they reach the field. That’s the difference between a contractor who orders a box and a design-build studio that engineers the connection.

Common New Detached ADU Problems We See in Sherman Oaks Homes

• Original galvanized supply lines and Orangeburg sewer laterals. Many 1950s Sherman Oaks homes still have these. They fail during trenching. We scope replacement in the initial quote, not as a change order, because we’ve photographed enough of them to know the odds.
• The Ventura Boulevard dividing line. Parcels south of Ventura climb into foothills that trigger the Hillside Ordinance - 15-foot rear setbacks, 20-foot front setbacks, grading restrictions, and fire-resistant construction mandates. Same zip code, very different project. We verify this on the first site visit.
• VHFHSZ fire review delays. Properties near the Santa Monica Mountain foothills require LA County Fire clearance and fire-hardening measures. Skipping this in permitting adds 6-8 weeks. We don’t skip it.
• Undersized electrical panels in the Valley heat. 100-amp panels won’t handle a detached ADU plus the main house’s AC load in 110°F weather. We specify 200-amp upgrades where needed, with load calculations that account for Sherman Oaks conditions.

Pricing for New Detached ADU in Sherman Oaks, CA

We Also Serve Cities Near Sherman Oaks

Our crews work throughout the San Fernando Valley, including New Detached ADU in Sherman Oaks and surrounding areas: Van Nuys, Studio City, Tarzana, and North Hollywood. Dispatch and scheduling are coordinated from our Los Angeles office. Each city has its own permitting quirks - Van Nuys’s flat lots differ from Tarzana’s hillside parcels - and we scope accordingly. Our New Detached ADU team covers the full metro area with the same written-price guarantee.

FAQs - New Detached ADU in Sherman Oaks