New Detached ADU in Van Nuys - Design, Permits and Build Under One Contract

Fast, Reliable New Detached ADU Across Van Nuys

A new detached ADU in Van Nuys typically runs $220,000-$420,000 all-in, from permit-ready drawings through final LADBS inspection, with most projects completing in 8-14 months depending on utility tie-ins and what the existing main house needs. We’re Ellery ADU Studio, and our New Detached ADU team designs, permits, and builds these units under one contract at one written price, with scheduling coordinated from our Los Angeles office and crews serving Van Nuys directly. Call (424) 325-4322 to schedule your free estimate, or bring us any written quote already in hand for a Free Second Opinion.

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Why Ellery ADU Studio Glendale Is Van Nuys’s Preferred New Detached ADU Company

We’ve designed, permitted, and built more than 900 ADUs since 2015, the year California’s ADU laws shifted, and a significant share of those have been in the San Fernando Valley. Van Nuys homeowners find us because they want the permit set treated as the core product, not an afterthought, and because our written price arrives before any work starts, per Haven Standard Clause 1. For those starting with an existing garage, our Garage Conversion ADU - Van Nuys service follows the same upfront-pricing model.

Our crews know the local terrain. Dispatch and scheduling run from our Los Angeles office, but the teams working Van Nuys live with the same inland heat you do. They understand why a west-facing detached unit near Victory Boulevard needs a different cooling spec than a north-facing build in Sherman Oaks. That local fluency shows up in the permit set, not just the build.

Clients here receive what every Ellery client receives: a documented photo record on every visit, a 365-Day Done Right Promise backed in writing, and a live person answering calls 24/7. No voicemail queue. No callback that doesn’t materialize.

Our New Detached ADU Services in Van Nuys

Custom Built ADU

Custom detached ADUs in Van Nuys start around $280,000 and climb toward $420,000 for larger two-bedroom units with full kitchens and utility separations. The custom path makes sense when your lot has constraints, a mature tree you want to preserve, or a specific roofline to match the main house. On the 1950s-60s tracts near Van Nuys Boulevard or Kester Avenue, we often design around existing rear-alley access and tight side setbacks that a prefab module can’t navigate. Every custom set we produce is permit-ready for LADBS, and because we build what we draw, there’s no designer-versus-builder gap when the inspector asks a question.

Prefab ADU Installation

Prefab ADU installation in Van Nuys typically runs $220,000-$340,000, including site prep, foundation, utility tie-ins, and LADBS final. We specify and coordinate systems from Abodu, Cover, and Dvele, integrating them into the same single contract as our custom work. The prefab route accelerates the build phase, but the permitting timeline stays similar, LADBS doesn’t care where the walls were fabricated. What matters in Van Nuys is whether the crane can reach your rear lot from the alley, and whether your existing electrical service can handle the additional load without a panel upgrade. We assess both before quoting.

Modular ADU

Modular ADUs in Van Nuys fall in the $240,000-$360,000 range, occupying the space between site-built and prefab: factory-built to California Building Code, then assembled on your foundation with local finish work. The modular path works well on the larger Van Nuys lots near Sepulveda Basin, where setback requirements are easier to meet and crane access is straightforward. We coordinate modular brands including Mighty Buildings and Plant Prefab, and we handle the LADBS plan-check ourselves rather than handing you off to a separate permit expeditor.

Studio ADU

Studio detached ADUs in Van Nuys typically cost $220,000-$290,000 all-in. These 350-450 square foot units suit rental income, home office, or aging-parent scenarios, and they qualify for the most streamlined LADBS review paths. On smaller Van Nuys lots, the studio footprint often fits where a one-bedroom would trigger additional parking or setback variances. We size the mini-split carefully here, Van Nuys’s triple-digit August afternoons will punish an undersized unit, especially on west-facing walls.

1-Bed & 2-Bed ADU

One-bedroom detached ADUs in Van Nuys run $260,000-$340,000; two-bedroom units range from $320,000-$420,000. The jump from one to two bedrooms isn’t just square footage, it’s separate utility metering, larger electrical service, and often a larger septic or sewer lateral. On older Van Nuys homes, that lateral is frequently original cast-iron or galvanized, and LADBS will require replacement as a condition of ADU permitting. We write these as line-item allowances in the original contract, priced and approved in writing before we touch anything.

Trusted Brands We Service in Van Nuys

We specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie, integrating whichever system suits your lot and budget into the same single contract that covers design, permitting, and build. For Van Nuys clients, this means we don’t hand you a kit and a phone number. We handle the LADBS submittal, the foundation engineering for your specific soils, the electrical tie-in to your main panel, and the final inspection. If you want James Hardie siding to match your main house, we specify it in the permit set and install it with the same crew that pours the foundation.

Common New Detached ADU Problems We See in Van Nuys Homes

• Original 60-100 amp panels with cloth-wrapped wiring. On a postwar block near Hazeltine Ave and Sherman Way, we opened the back wall of a 1955 Van Nuys home to tie a new detached ADU into the main panel and found the original 60-amp service feeding cloth-wrapped wiring. LADBS requires a full panel upgrade and modern grounding before they’ll sign off on the ADU electrical. We wrote these as line-item allowances before signing, priced the panel upgrade in writing once the inspection confirmed it, and still hit the client’s original target for the 1-bed unit.
• Pre-1994 raised foundations and unreinforced concrete-block garage walls. The 1994 Northridge earthquake epicenter sat only a few miles west in Reseda, and Van Nuys properties frequently have foundations and walls that trigger mandatory seismic upgrades during LADBS plan-check. This is a cost line that blindsides homeowners who budgeted based on ADU quotes from newer parts of the city. We identify the risk during our initial site visit and price the upgrade as a contract allowance, not a change order.
• Undersized cooling systems on west-facing detached units. Van Nuys sits deep in the inland San Fernando Valley and routinely records summer highs 15-20°F above coastal LA. An undersized mini-split in a west-facing garage conversion or detached ADU can make the unit barely habitable by August, a complaint that shows up repeatedly in local contractor reviews. Title 24 energy compliance demands serious attention to cooling loads here. We size equipment for the actual load, not the plan’s base spec.
• Aging cast-iron or galvanized drain lines. A large share of Van Nuys’s 1950s-60s housing stock still carries original drain lines that fail under the additional ADU load. LADBS typically requires replacement as a condition of permitting. We camera the line during our initial assessment and write the replacement as a priced allowance, so you’re not learning about it after walls are open.

Pricing for New Detached ADU in Van Nuys, CA

We Also Serve Cities Near Van Nuys

Our crews work throughout the San Fernando Valley and adjacent neighborhoods, including New Detached ADU in Van Nuys proper plus Sherman Oaks, Studio City, North Hollywood, and West Hollywood. Each city’s jurisdiction differs, LADBS for Van Nuys, Burbank’s own building department just east, Glendale’s to the northeast. That jurisdictional fluency matters for permitting timelines and standard-plan eligibility.

FAQs - New Detached ADU in Van Nuys