Fast, Reliable Garage Conversion ADU Across Van Nuys
A garage conversion ADU in Van Nuys typically runs $160,000-$280,000 all-in for a standard detached garage conversion, with permit-ready drawings, LADBS plan check, construction, and final inspection folded into one written price. Most Van Nuys projects take 8-14 months from first drawings to certificate of occupancy. That range reflects the foundation, electrical, and Title 24 work that LADBS actually enforces here, not a generic statewide estimate. Our team coordinates every phase under one contract, and a live person answers calls around the clock. You can reach us at (971) 497-2402 to schedule your free estimate.
Van Nuys is a specific place with specific rules. We don’t treat it like Sherman Oaks or North Hollywood, because the permit requirements, the housing stock, and the heat load are not the same. The wide, flat R1 lots off Vanowen Street and Victory Boulevard hold thousands of 1950s and 1960s garages that look like easy conversions. They usually aren’t, for one quiet reason: the original slab almost never has a perimeter footing. That single fact changes the scope, the cost, and the schedule more than any other variable on a Van Nuys project.
Why Ellery ADU Studio Is Van Nuys’s Preferred Garage Conversion ADU Company
Ellery ADU Studio has operated as a design-build studio since 2015, the year California’s ADU permitting landscape shifted. We don’t hand off drawings to a separate builder and walk away. The architectural drawings, the permit set, and the construction are a single contract at a single written price. Under Clause 1 of The Haven Standard, the price is written before any work starts. Under Clause 5, the scope is locked at signing. No door-side upsells.
Our Garage Conversion ADU team has worked on 900+ ADUs across Southern California, and Van Nuys projects hold their own particular rhythm. We know the Van Nuys LADBS district office and what its plan checkers ask for on 1950s-era slab-on-grade garages. We know that original 100-amp panels are the default on this housing stock, and we scope the 200-amp service upgrade before we quote, not after. Clients receive a documented photo record on every visit, so you see what we found in your crawlspace, your panel, and your slab, not a summary of how it felt.
Nadia Ellery leads the studio. Her approach is plain: the permit set is the core product. Everything else follows from that. If the finished ADU is not built to the permitted drawings, the 365-Day Done Right Promise means we make it right, in writing, before the project starts.
Reach the Van Nuys scheduling line at (971) 497-2402. Dispatch is coordinated from our Los Angeles office, and crews serve Van Nuys locally.
Our Garage Conversion ADU Services in Van Nuys
Detached Garage Conversion
Detached garage conversions are the most common ADU path in Van Nuys, because the postwar inventory of standalone one- and two-car garages is nearly universal on the 7,000-9,000 sq ft lots that dominate the neighborhood. A detached conversion avoids the shared-wall and fire-rating complications of an attached build, but it surfaces the foundation question immediately. The 1962 slab on your detached garage was poured as a floor, not a footing. LADBS will almost always require a new continuous grade beam before framing can proceed. We scope that before we quote, not after you’ve signed.
Carport Conversion
Some Van Nuys homes never had a garage; they have a carport, often open on one or two sides, tucked behind the house. A carport conversion in Van Nuys involves enclosing the structure, but also bringing it to full habitable standard: insulation, drywall, a properly sized mini-split, and often new footings. The slab question is the same. If the carport slab sits directly on grade with no footing, the conversion price changes. We plan for that on the front end.
Garage JADU
A Junior ADU carved out of an attached garage is a strong option on Van Nuys’s smaller lots or for homeowners who want to keep a portion of the garage for storage. A Garage JADU under LA City rules caps at 500 sq ft and can share the primary home’s sewer and some utilities, which holds electrical costs down. The tradeoff is that a JADU requires an efficiency kitchen and a separate entrance, and those details need to appear in the permit set from day one. We handle the full conversion, including the partition wall and the bathroom add.
Garage Partition & Bathroom Add
If you’re not ready to convert the entire garage, a partition and bathroom add splits the space into an ADU-ready zone plus storage or workspace. This is common in Van Nuys, where homeowners want to phase the project over two or three years without losing the whole garage. The bathroom add triggers plumbing rough-in and often a sewer line scope, and on Van Nuys’s older homes the cast-iron lateral may need replacement. We price that work against the actual plan, not a per-square-foot guess.
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 Van Nuys
For Van Nuys conversions, we specify and coordinate prefab and modular systems from James Hardie, Abodu, and Cover, along with other manufacturers where the project calls for them. James Hardie siding and trim hold up to the Van Nuys sun better than vinyl or raw wood, and the UV load here is aggressive, no marine layer to soften it. Abodu and Cover units can shorten the on-site build time, which matters when your detached garage is just feet from the property line and you want to minimize yard disruption. We don’t stock parts for these systems on a shelf; we order each component per the permit set and the written scope, then coordinate delivery to your Van Nuys site. Every warranty and installation detail is covered in the same single contract.
Common Garage Conversion ADU Problems We See in Van Nuys Homes
- The 1950s slab has no perimeter footing. On a detached garage conversion near Vanowen Street, our crew found the 1962 slab acting as both floor and footing, no continuous grade beam, just a monolithic pour over hardpan. LADBS plan check required a new perimeter grade beam before we could frame the ADU’s walls, so we saw-cut the slab, excavated to undisturbed soil, and placed a continuous footing with doweled rebar. That single change added weeks and five figures, but it was the difference between a permitted ADU and a red-tag risk.
- The mini-split is sized for coastal conditions. Van Nuys sits in CEC Climate Zone 9, where sustained triple-digit heat is the design condition, not a fluke. A contractor who prices a mini-split based on coastal loads will under-size the system, and the ADU fails Title 24 cooling compliance at plan check. We size cooling equipment for Van Nuys, not Santa Monica.
- The 100-amp panel is assumed adequate. Original 100-amp electrical panels are widespread on 1950s-1970s Van Nuys homes. LADBS consistently requires a 200-amp service upgrade as a condition of ADU permitting. This is a known cost, not a surprise, unless the bidder conveniently leaves it out.
- Poor grading sends water onto the slab. On large Van Nuys R1 lots, the converted garage can sit 3 inches low relative to the surrounding yard. In a rainy winter, water pours onto the slab instead of shedding away from it. We scope the grading correction during design, which means the permit set shows the finished pad elevation before construction begins.
Pricing for Garage Conversion ADU in Van Nuys, CA
A detached garage conversion in Van Nuys runs $160,000-$280,000 all-in. A carport conversion typically lands at $140,000-$220,000. A Garage JADU, because of the 500 sq ft cap and shared utilities, commonly runs $90,000-$160,000. A garage partition and bathroom add, as a phased first step, runs $45,000-$90,000. These are written-scope numbers, not per-square-foot guesses.
What pushes a Van Nuys project toward the top of that range: the continuous grade beam under the existing slab, the 200-amp service upgrade, a sewer lateral replacement, and a mini-split sized for Zone 9 heat. What holds it down: a slab with an existing perimeter footing (rare but occasionally present on later-1970s builds), a clean 200-amp panel already in place, and a simple rectangular footprint that doesn’t require structural gymnastics. Every project gets a written price before work starts. A Free Second Opinion on any written estimate you already have in hand is available. Call (971) 497-2402 to schedule.
We Also Serve Cities Near Van Nuys
Our crews handle garage conversion ADUs across Van Nuys and the surrounding Valley, including Sherman Oaks, Studio City, North Hollywood, and North Hills. If you’re on the edge of Van Nuys near the 405 or the 170, we cover your neighborhood the same way, with the same written-scope and written-price process. The local heat, the housing stock, and the LADBS requirements don’t stop at the city line.
Serving Van Nuys, CA - Our Local Coverage Area
We’re based in the Van Nuys 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 - Garage Conversion ADU in Van Nuys
Because the original 1950s-1970s slab was poured as a floor on grade, not as a structural footing. LADBS plan check in Van Nuys almost always triggers a foundation review that requires a continuous grade beam around the perimeter before the ADU walls can be framed. The slab looking fine from above is not the test. The test is whether it can carry the structural load of a habitable building, and most can’t. We scope this before we quote, so the price you sign reflects the foundation work, not an optimistic estimate. Call (971) 497-2402 to talk through your specific garage.
Yes, with a caveat. Van Nuys sits within City of Los Angeles jurisdiction, so homeowners have access to LA’s streamlined ADU permitting program and pre-approved standard plans. The caveat is that pre-approved plans apply to the structure above the foundation. The foundation below it, your existing slab, still has to meet LADBS requirements on your specific lot. That’s where the continuous grade beam and the grading review enter. The streamlined process saves time on plan check. It doesn’t skip the soils and foundation review.
Almost never. Original 100-amp panels are the default on Van Nuys’s 1950s-1970s housing stock, and LADBS enforcement consistently requires a 200-amp service upgrade as a condition of ADU permitting. We scope the upgrade during the design phase, so it appears in the written price from the start. If a bid doesn’t mention your panel, ask whether they’ve checked it against the ADU electrical load calculation. If the answer is vague, that’s your signal to keep looking.
Van Nuys sits in CEC Climate Zone 9, one of the hottest urban climates in California. The September 2020 heat event hit 117°F. Title 24 cooling-load compliance here is demanding. A mini-split sized for coastal Los Angeles conditions will be undersized, the ADU will overheat in summer, and the plan check will fail. We size cooling equipment for sustained triple-digit temperatures, which often means a larger condenser and more carefully placed heads. This is a line item we name in the written scope, not a discovery made after the first heat wave.
Yes. The flat, wide R1 lots in Van Nuys don’t shed water aggressively, and the existing garage slab is often the lowest point in the yard. In a rainy winter, water runs toward the structure instead of away from it. We address this in the design: the permit set shows the finished pad elevation, and the grading plan directs water to the street or a dry well. This is not an optional add-on. On a Van Nuys lot, drainage is part of the permit package. Call (971) 497-2402 for a written estimate on your specific property.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Van Nuys since 2015.