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

Trusted New Detached ADU for Van Nuys Homeowners

A new detached ADU in Van Nuys typically costs $285,000-$485,000 all-in, from permit-ready drawings through final inspection, depending on size, finish level, and whether you build custom or go prefab. Most Van Nuys projects we design and build are completed in 8-14 months, with permitting through LA Department of Building and Safety taking 4-6 months of that timeline. Call (424) 523-8492 to review your lot and receive a written price before any work begins.

Call (424) 523-8492

We’ve designed, permitted, and built over 900 ADUs since 2015, the year California’s state law forced cities to allow detached accessory dwelling units by right. Van Nuys sits in LA’s San Fernando Valley, where R-1 and R-2 lots often have the depth and width for a detached unit behind the main house. The challenge isn’t whether you can build, it’s whether your permit set survives plan check without costly redesigns. That’s why Ellery ADU Studio treats the drawings as the core product, not an afterthought. Our permit sets are produced in-house, coordinated with structural and MEP, and submitted under our license. One contract. One written price. No designer-versus-builder blame gap when something doesn’t line up in the field.

Van Nuys homeowners call us when they’ve already talked to a contractor who won’t commit to a number, or a designer who doesn’t build and can’t say what their drawings will actually cost to construct. We eliminate that uncertainty. Under Haven Standard Clause 1, every project receives a written price before any work starts. Under Clause 5, that scope is locked at signing. What we quote is what you pay.

What Our New Detached ADU Service Includes

Custom Built ADU

A custom built ADU is designed from scratch for your specific lot, your aesthetic preferences, and your long-term use case, whether that’s rental income, multigenerational living, or a home office that converts later. You need this approach when your Van Nuys lot has constraints that prefab can’t accommodate, such as an irregular shape, significant slope, or specific setback conditions along the Tujunga Wash or near Van Nuys Airport noise contours. At Ellery ADU Studio, we produce the full architectural permit set in-house, coordinate structural engineering for the expansive clay soils common in Valley neighborhoods, and build through our own crews. The same team that drew your roofline installs your roof. If the rafters don’t match the drawings, we answer for it.

Prefab ADU Installation

Prefab ADU installation means specifying a factory-built unit, typically delivered in one or two modules, then setting it on a foundation we prepare and connecting utilities on site. This path makes sense in Van Nuys when speed matters, when your design needs are straightforward, and when you want cost predictability that comes from factory-controlled labor and materials. We specify and coordinate prefab systems from brands including Abodu, Cover, and Tuff Shed, integrating their production schedules with our site prep and utility work under the same single contract. The factory builds the box. We ensure the foundation, electrical service upgrade, and sewer lateral tie-in meet LA Department of Building and Safety requirements before the crane arrives. One written price covers both halves.

Modular ADU

Modular ADUs are built to the same California Building Code as site-built structures, but constructed in factory modules that are transported and joined on your Van Nuys property. The distinction from prefab is structural: modular units are typically steel-framed or high-performance wood-framed, engineered for seismic loads, and often suited to two-bedroom configurations or second-story additions above the ADU itself. We work with modular manufacturers including Dvele and Mighty Buildings, reviewing their shop drawings against your lot’s geotechnical conditions and the City of Los Angeles’s hillside grading requirements where applicable in sloped Valley neighborhoods. Our permit set incorporates their structural connections, their fire-rated assemblies, and their utility chase locations so plan check moves in one cycle, not three.

Studio ADU

A studio ADU is a single-room dwelling, typically 300-450 square feet, with a full bathroom and kitchenette, designed for one occupant or a couple without children. In Van Nuys, studio ADUs rent for $1,800-$2,400 monthly depending on proximity to the Orange Line or Van Nuys Boulevard transit corridor, making them the fastest-payback option for homeowners who want rental income without the complexity of a larger build. We design studios with attention to natural light orientation, given Valley summers, and specify cool-roof assemblies and mini-split HVAC sizing that handles 100-degree August afternoons without oversizing equipment. Every studio permit set we produce includes the Title 24 energy calculations required by California, submitted as part of the initial package.

1-Bed & 2-Bed ADU

One-bedroom and two-bedroom ADUs range from 500 to 1,200 square feet and function as independent rental units, guest housing, or dedicated space for adult children or aging parents. Van Nuys lots in the 6,000-7,500 square-foot range, common south of Victory Boulevard and east of Sepulveda, often accommodate a 750-square-foot two-bedroom unit while maintaining the required 4-foot rear and side setbacks. We produce floor plans that separate sleeping areas from living noise, specify sound-rated partition assemblies between units when relevant, and design for accessibility visitability even when full ADA compliance isn’t required. The permit set includes electrical load calculations for 200-amp service upgrades, which most Van Nuys main houses need to support a second kitchen and laundry.

Brands We Service for New Detached ADU

We’ve specified and coordinated prefab and modular systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie since these manufacturers entered the California market. With Abodu, we’ve completed dozens of installations in LA County, managing their 10-week production cycle against our site prep timeline so the crane date doesn’t slip. Their units arrive with finishes installed, which means our crew’s work is foundation, utility rough, set, and final connection. With Tuff Shed, we often start with their shell and complete interior fit-out on site, a hybrid approach that reduces cost for Van Nuys homeowners who want weather-tight speed without sacrificing custom kitchen or bath selections. James Hardie siding is our default specification for custom builds in fire hazard severity zones, which includes portions of the Valley interface, because their fiber-cement assembly meets LA County’s ignition-resistant requirements without the maintenance burden of wood.

Whether your project calls for a Cover unit with its integrated mechanical chase, a Dvele steel-frame modular with net-zero capability, or a site-built structure with James Hardie cladding, we coordinate the specification, the submittals to LADBS, and the field installation under the same contract and the same written price. If you have a quote from another manufacturer in hand, we offer a Free Second Opinion to verify that foundation, utility, and soft costs are fully accounted for.

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Signs You Need New Detached ADU Right Now

• Your mortgage payment has outpaced your income growth. Van Nuys homeowners who bought between 2018 and 2022 are carrying payments at 5-7% interest rates that didn’t exist when they budgeted. A detached ADU generating $2,000-$3,500 monthly in rental income changes the household math permanently. We design for rental durability, specifying flooring and fixtures that withstand tenant turnover without replacement every two years.
• Your parents need proximity, not dependence. Multigenerational living fails when it lacks physical separation. A detached unit maintains family connection while preserving privacy for both households. We design with separate meters where requested, so utility costs don’t become a monthly negotiation, and we specify sound-rated construction when the ADU sits near the main house’s outdoor living areas.
• Your adult child needs housing but the market won’t provide it. The median rent for a one-bedroom in Van Nuys exceeds $2,200. A studio ADU on your lot costs less per month in financing than market rent, and it remains your asset. We design for flexibility, with kitchenettes that convert to wet bars if the use case shifts later, and we future-proof electrical panels for EV charging that may matter to the next occupant.
• Your home office is consuming your living room. Permanent remote work requires dedicated space. A detached studio ADU separates work from home psychologically and physically, with the tax advantages of a dedicated home office structure. We specify internet conduit and electrical capacity for the equipment load of professional video conferencing, not just laptop use.
• Your lot meets the minimum criteria but you’re unsure of the path. LA’s ADU ordinance allows detached units on any residential lot with an existing single-family home, provided setbacks and height limits are met. If you’ve confirmed your lot size and haven’t started, you’re already behind neighbors who filed permits last quarter. LADBS permit volume in Van Nuys has increased 340% since 2020. Queue times lengthen every month you delay.

Our New Detached ADU Process - Step by Step

1. 1
   Site feasibility and written price. We visit your Van Nuys property, measure setbacks, photograph existing conditions, and review the assessor’s parcel map for easements or utility conflicts. Within two weeks, you receive a written price for the complete project, drawings through final inspection, with line-item breakdown. Haven Standard Clause 1 applies: no price without a number, no work before you approve it.
2. 2
   Design and permit set production. Our architectural team produces floor plans, elevations, structural calculations, and MEP drawings in-house. We coordinate with a geotechnical engineer when your lot shows signs of expansive soil, common in Valley fill areas, and we submit the complete package to LADBS electronically. You receive a copy of every drawing, every calculation, and every correction letter.
3. 3
   Plan check and correction response. LADBS reviews for code compliance, structural integrity, and Title 24 energy performance. When corrections are required, we respond directly, without routing through a third party. Our permit sets achieve first-round approval on 73% of submissions because we pre-coordinate structural and MEP before submission, rather than treating them as afterthoughts.
4. 4
   Site prep and construction. With permit in hand, we prepare the foundation, upgrade electrical service if required, and rough utilities. Construction proceeds under our license, with background-checked, uniformed crews. Every visit produces a documented photo record, uploaded to your project portal, showing what was found and what was done. You don’t receive a summary of how it felt. You receive evidence.
5. 5
   Final inspection and 365-Day Done Right Promise. LADBS inspectors verify structural, electrical, plumbing, and final occupancy. We correct any items before you attend. Upon passing, you receive keys, a complete as-built drawing set, and a written warranty under Haven Standard Clause 8. If anything in the finished ADU is not built to the permitted drawings, we make it right. The promise is in writing before the project starts.

How Much Does New Detached ADU Cost in Van Nuys?

New Detached ADU Near Van Nuys - Our Service Area

We design and build detached ADUs throughout the San Fernando Valley and adjacent LA Basin neighborhoods. Our typical project radius includes Sherman Oaks, Encino, North Hollywood, Studio City, Northridge, Tarzana, Burbank, Beverly Hills, West Hollywood, West Los Angeles, and Chatsworth. Response time for initial site visits is typically 3-5 business days in Valley locations, 5-7 days for Westside and Beverly Hills. We’ve permitted ADUs in each of these jurisdictions and maintain current relationships with LADBS plan check staff, Burbank Building Division, and Beverly Hills Community Development. If your property sits near a city boundary, we verify jurisdiction before design begins to ensure your permit set meets the correct municipal code, not just the state’s baseline.

Frequently Asked Questions - New Detached ADU in Van Nuys

Schedule Your New Detached ADU Service in Van Nuys Today

Call (424) 523-8492 to schedule your free feasibility visit and written estimate. A live person answers 24/7. You’ll receive a line-item price before any work begins, a documented photo record on every construction visit, and the 365-Day Done Right Promise in writing. Nadia Ellery and the team at Ellery ADU Studio have operated as a design-build studio since 2015, with 900+ ADUs designed, permitted, and built under one contract at one written price.

Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Van Nuys since 2015.