New Detached ADU in Van Nuys - One Fixed Price, Permits Handled

Fast, Reliable New Detached ADU Across Van Nuys

A new detached ADU in Van Nuys typically runs $220,000-$380,000 all-in, from permit set through final inspection, with most projects completing in 8-14 months depending on utility complexity and whether you use the city’s Standard ADU Plan Program. Our crews serve Van Nuys from our Los Angeles office, and we’ve designed, permitted, and built more than 900 ADUs since 2015 - every one with a written price before work started, per Haven Standard Clause 1. Call (424) 551-7706 to schedule your free estimate.

Call (424) 551-7706

Van Nuys is not Santa Monica. The Valley heat pocket here - routinely the hottest readings in all of Los Angeles County - changes what we specify, what we charge, and what fails first. Most ADU contractors treat every Los Angeles lot the same. We don’t. On a 1950s ranch off the alley near Van Nuys Blvd and Sherman Way, our tech pulled the original detached garage apart and found every galvanized lag, hinge and strap on the alley-side man-door rusted to the point of snapping - the garage had been baking at 105°F+ every summer for sixty years with zero ventilation. We rebuilt the new detached ADU shell with hot-dip galvanized and stainless fasteners, specified a cool-rated standing-seam roof over closed-cell-insulated framing, and set marine-grade aluminum window frames with stainless rollers instead of the vinyl units the first bid carried, so the alley-facing elevation wouldn’t be a rust farm within a decade.

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

We’ve been a design-build studio since 2015, the year California’s ADU laws shifted, and we’ve completed projects across the San Fernando Valley’s post-war ranch stock. Our Van Nuys clients receive the same single-contract structure that eliminates the designer-versus-builder blame gap: drawings, permit set, and construction under one written price.

Our license number appears on every page, and our crews are background-checked and uniformed. The Haven Standard governs every project - Clause 1 locks your written price before any work begins, Clause 5 prohibits scope creep, and our 365-Day Done Right Promise is backed in writing. A live person answers calls 24/7. We also offer a Free Second Opinion on any written estimate already in your hand.

Dispatch and scheduling are coordinated from our Los Angeles office, with crews serving Van Nuys locally. We know the 91401, 91405, 91406, 91411 ZIP codes, the alley-access lots off Victory Boulevard, and the specific Title 24 cooling-load requirements that the Valley heat pocket triggers.

Our New Detached ADU Services in Van Nuys

Custom Built ADU

Custom built ADUs in Van Nuys start around $280,000 and scale to $380,000+ for two-bedroom units with full kitchens and utility separations. The 1950s-60s ranch lots here - typically 6,000-7,500 square feet with detached garages accessed from rear alleys - give us clean build envelopes, but the aging 60-amp sub-panels and uninsulated slab foundations we find on nearly every Van Nuys site add electrical and structural line items that coastal contractors underestimate. We specify hot-dip galvanized or stainless fasteners for all alley-facing hardware, marine-grade aluminum window frames, and closed-cell insulation assemblies rated for 105°F+ interior peak loads. Your permit set includes Title 24 compliance documentation for the San Fernando Valley climate zone, not the mild coastal assumptions that get plans rejected at LADBS Plan Check.

Prefab ADU Installation

Prefab ADU installation in Van Nuys typically runs $220,000-$320,000 depending on manufacturer, site access from the alley, and utility tie-in complexity. We specify and coordinate systems from Abodu, Cover, and Mighty Buildings within our single-contract model - the manufacturer delivers the module, and our crew handles foundation, utility rough-in, and final connections. Van Nuys’s flat, rectangular lots with alley access actually suit prefab well: crane placement on Victory Boulevard or Van Nuys Boulevard side streets is straightforward, and the module can roll in from the rear. But the heat spec still matters. We require manufacturers to upgrade to stainless or marine-grade exterior hardware and cool-climate glazing packages; the standard coastal window spec fails here in three summers.

Modular ADU

Modular ADUs follow the same price band as prefab - $220,000-$320,000 - with the added flexibility of multi-module configurations for larger 1-bed and 2-bed layouts. Dvele and Plant Prefab systems can be specified through our contract. The key local variable is foundation: Van Nuys’s uninsulated slabs and expansive clay soils in some pockets mean we often specify post-tensioned or thickened-edge foundations rather than the generic floating slab a manufacturer might propose. We handle the geotechnical recommendation, the LADBS submittal, and the build - one contract, one written price.

Studio ADU

Studio ADUs are the most common detached unit we design in Van Nuys, typically $220,000-$280,000 all-in. The large multi-generational Latino households in this neighborhood often want a “casita” for family, not a rental unit, so the program prioritizes kitchenette function, private bathroom, and separate HVAC over the investor-focused amenities you see in coastal markets. We specify mini-split systems with SEER ratings high enough for Valley cooling loads - effectively non-negotiable here, where summer interior peaks stress under-sized units and trigger occupant complaints that have nothing to do with construction quality. The Haven Standard Clause 1 written price includes the correctly-sized mechanical package; we don’t bait with a cheap unit and change-order the upgrade.

1-Bed & 2-Bed ADU

One-bedroom detached ADUs in Van Nuys typically run $260,000-$320,000; two-bedroom units with full kitchens and separate utility meters reach $340,000-$380,000. The jump from studio to 1-bed is mostly kitchen and plumbing; the jump to 2-bed adds bedroom egress, larger septic or sewer connection, and often a second mini-split zone. On Van Nuys’s standard 6,000-7,500 sq ft lots, we can usually place a 2-bed detached unit within setback requirements while preserving the rear alley access, but the site plan requires precise survey work - included in our permit set, not an add-on.

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 within our single-contract model. For Van Nuys’s heat-pocket climate, we default to Abodu and Cover for their cool-climate glazing upgrades and stainless hardware options, and we specify Mighty Buildings’ fiber-reinforced polymer exteriors where clients want zero maintenance on the alley-facing elevation. Every brand we work with can be configured for Title 24 San Fernando Valley compliance - not coastal LA assumptions - and we handle the manufacturer coordination, site prep, and final utility tie-in as one scope with one written price.

Common New Detached ADU Problems We See in Van Nuys Homes

• Galvanized and electroplated fasteners, hinges, thresholds and fence posts on the alley side fail early because Valley heat cycling plus inland dust and smog accelerate corrosion. Cheap hardware that would survive a decade near the coast pits out in a few summers here. We specify hot-dip galvanized or stainless for every exterior connection.
• Vinyl and low-grade aluminum window frames and sliding-door tracks warp, chalk and seize under 105°F+ summer interior loads, so cooling-first Title 24 compliance is compromised by the very fenestration the low bid installed. We specify marine-grade aluminum with stainless rollers or fiberglass composite frames rated for desert-edge climates.
• Railings, paver joints and exterior stair treads left unsealed on detached ADUs crack and open up when the slab and pavers expand through the Valley heat, letting water and dust into joints that a coastal job would never stress the same way. We specify sealed expansion joints and flexible polymeric paver sand on every Van Nuys project.
• Original 60-amp sub-panels and uninsulated slab foundations are nearly universal in Van Nuys’s 1948-1968 ranch stock. The sub-panel must be upgraded to 100-amp minimum for a detached ADU, and the slab either insulated or replaced - both scope items we identify during our first site visit and document in your written price, not discovered mid-construction.

Pricing for New Detached ADU in Van Nuys, CA

We Also Serve Cities Near Van Nuys

Our New Detached ADU team works across the San Fernando Valley and adjacent communities. We also serve Sherman Oaks, Studio City, North Hollywood, and Encino - each with the same single-contract structure, written upfront pricing, and climate-appropriate material specifications.

FAQs - New Detached ADU in Van Nuys