ADU in West Los Angeles, CA
Junior ADU & Interior Conversion in West Los Angeles typically runs $85,000-$165,000 all-in, drawings through final inspection, and ADU Site Prep & Utilities adds $15,000-$45,000 depending on whether your 1940s-1960s bungalow needs a panel upgrade or sewer lateral replacement. We’re Ellery ADU Studio, and we handle the permit set, the build, and the final inspection under one contract at one written price. Call (747) 322-4648 for a free estimate with no call-for-pricing runaround.
Why West Los Angeles Homes Are Different
West Los Angeles sits in a narrow coastal band where the marine layer never fully burns off, keeping slabs cold and moisture-laden year-round. The housing stock in Palms, Mar Vista, and Sawtelle is remarkably consistent: post-war bungalows and modest Spanish Colonials on 5,000-7,500 sq ft lots, almost all with detached slab-on-grade garages sized right in California’s 500-800 sq ft ADU sweet spot. But those slabs were poured without vapor barriers, and the garages run on single 15-amp circuits. Slab moisture remediation and electrical panel upgrades are baseline scope on nearly every conversion we price here.
Many lots in Palms and Sawtelle have rear-alley access with garage doors facing the alley. When we convert these to ADUs, the primary address and utility connections must be re-engineered to the alley side, a permitting wrinkle that LA Bureau of Engineering handles differently than street-facing conversions. This routinely surprises contractors pulling their first westside permit. The Standard Plan Program can fast-track over-the-counter approval, but only if your submittal accounts for these addressing and utility routing realities from day one.
Our Main West Los Angeles Services
West Los Angeles homeowners call us most often for these three services, each with its own dedicated page and local pricing.
ADU Design & Permitting in West Los Angeles
We produce the full permit set, structural calculations, and Title 24 energy compliance documentation for your ADU project in West Los Angeles. Our drawings are built to survive LA Department of Building and Safety plan check, including the alley-access addressing protocols that catch first-time westside permitters off guard. Every set includes slab moisture remediation details for marine-layer conditions. ADU Design & Permitting in West Los Angeles covers the full scope.
Garage Conversion ADU in West Los Angeles
We convert detached garages in Palms, Mar Vista, and Sawtelle into permitted rental units, handling the vapor barrier retrofit, panel upgrade, and alley-side re-addressing in one contract. The finished units typically rent for $2,500-$3,800/month in this market. Garage Conversion ADU in West Los Angeles has the full breakdown.
New Detached ADU in West Los Angeles
When the existing garage won’t work or the lot has space for a ground-up unit, we design and build new detached ADUs from foundation to final inspection. We specify prefab systems from Abodu, Cover, and Dvele where the site conditions allow faster delivery. New Detached ADU in West Los Angeles covers design options and pricing.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Before
AfterJunior ADU & Interior Conversion in West Los Angeles
Junior ADU & Interior Conversion in West Los Angeles solves the problem homeowners face when they need rental income or family housing but lack the budget or lot space for a detached unit. We convert existing interior space, attached garages, and basements into self-contained units, navigating the owner-occupancy requirements and utility separation rules that differ from detached ADU codes. In West Los Angeles, this often means working within the tight footprints of 1940s-1960s bungalows where every square foot counts and the marine layer demands careful moisture management in below-grade work. Junior ADU & Interior Conversion is our dedicated service hub for this work.
Room-to-ADU Conversion
Signs you need it
You have an underused bedroom wing, a former rental room with its own exterior door, or a grown child’s room sitting empty while mortgage payments climb.
What it costs in West Los Angeles
Room-to-ADU conversions in West Los Angeles typically run $85,000-$135,000 all-in, including the separate kitchen and bath, mini-split HVAC, and owner-occupancy documentation.
How we do it
We measure the existing space, design the kitchen and bath layout to code minimums, produce the permit set with utility separation details, and build through final inspection under Haven Standard Clause 1’s written price guarantee.
Interior JADU
Signs you need it
You need the fastest path to legal rental income without exterior construction, and your primary residence has a spare room with shared-wall potential for a kitchenette.
What it costs in West Los Angeles
Interior JADUs in West Los Angeles typically run $65,000-$95,000, reflecting the reduced scope, no foundation work, and streamlined permitting under California’s JADU statute.
How we do it
We verify owner-occupancy compliance, design the kitchenette and separate entrance to JADU standards, pull the permit, and build with documented photo records on every visit.
What Junior ADU & Interior Conversion Costs in West Los Angeles
| Item | Typical range in West Los Angeles |
|---|---|
| Room-to-ADU conversion (all-in) | $85,000 - $135,000 |
| Interior JADU (all-in) | $65,000 - $95,000 |
| Above-garage JADU (structural + finish) | $95,000 - $165,000 |
Do JADUs require owner occupancy in West Los Angeles?
Yes, California law requires the property owner to live in either the main house or the JADU, and LA Department of Building and Safety verifies this at permit. We document your occupancy status in the permit set so the plan checker has no reason to stop the file. Call (747) 322-4648 for an exact quote on your specific layout.
Can I convert a basement in West Los Angeles?
Basement ADUs are legal in West Los Angeles but rare because few homes have them, and marine-layer moisture makes below-grade work technically demanding. When the site allows, we install perimeter drainage and a full vapor barrier assembly before framing. Call (747) 322-4648 to assess your basement’s feasibility.
ADU Site Prep & Utilities in West Los Angeles
ADU Site Prep & Utilities in West Los Angeles addresses the hidden infrastructure that must be in place before any ADU can be permitted or occupied. The 1940s-1960s housing stock here was built for single-family electrical and sewer loads, not a second kitchen, bath, and HVAC system. We handle the foundation, grading, electrical service upgrades, and utility extensions that other contractors assume “someone else” will manage. In West Los Angeles, the marine layer and unprotected garage slabs make moisture remediation a standard line item, not an upsell. ADU Site Prep & Utilities is our dedicated service hub for this work.
Electrical Panel Upgrade
Signs you need it
Your garage runs on a single 15-amp circuit, your main panel is full, or the existing service is 100 amps for a house now adding a second dwelling unit.
What it costs in West Los Angeles
Electrical panel upgrades in West Los Angeles typically run $4,500-$8,500 for a 200-amp service with sub-panel to the ADU, including LADBS permit and inspection.
How we do it
We size the new load per Title 24, coordinate with LADWS on service lateral capacity, pull the permit, and install with inspection scheduling built into the project timeline.
Foundation & Grading
Signs you need it
Your garage slab has no vapor barrier, measures under 4 inches, or shows spalling and moisture staining that will fail inspection and destroy finished flooring.
What it costs in West Los Angeles
Foundation and grading work in West Los Angeles typically runs $12,000-$28,000, including slab replacement with vapor barrier, perimeter drainage, and compaction per geotechnical note.
How we do it
We test the existing slab, design the replacement assembly for marine-layer conditions, and pour with insulation and vapor barrier integrated to meet Title 24 energy compliance.
What ADU Site Prep & Utilities Costs in West Los Angeles
| Item | Typical range in West Los Angeles |
|---|---|
| Electrical panel upgrade (200-amp service + sub-panel) | $4,500 - $8,500 |
| Foundation & grading (slab replacement with vapor barrier) | $12,000 - $28,000 |
| Plumbing lateral extension to alley or rear | $8,000 - $18,000 |
Does every garage conversion need a panel upgrade in West Los Angeles?
Nearly all do, because the original 15-amp garage circuit cannot handle a kitchen, bath, and HVAC load. We verify service capacity during the initial site visit and include the upgrade in the written scope if needed. Call (747) 322-4648 for a load calculation on your specific house.
Is slab replacement always required for garage conversions?
Not always, but in West Los Angeles the absence of original vapor barriers means most 1940s-1960s slabs fail moisture testing. We test first, replace when necessary, and never bury a bad slab under finished flooring. Call (747) 322-4648 to schedule a slab assessment.
Brands We Service in West Los Angeles
We specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, and Mighty Buildings within our single-contract model. Our crews are trained on these systems’ installation protocols, and we stock common connection hardware locally for faster project starts. Our brands page has full specifications.
Pricing for ADU in West Los Angeles, CA
| Service | Typical range in West Los Angeles |
|---|---|
| Room-to-ADU conversion | $85,000 - $135,000 |
| Interior JADU | $65,000 - $95,000 |
| Above-garage JADU | $95,000 - $165,000 |
| Electrical panel upgrade | $4,500 - $8,500 |
| Foundation & grading | $12,000 - $28,000 |
| Plumbing lateral extension | $8,000 - $18,000 |
| Gas line extension | $3,500 - $7,500 |
| Landscaping & hardscape (post-build) | $5,000 - $15,000 |
Prices push higher in West Los Angeles when alley-access re-addressing is required, when sewer laterals need directional boring under existing hardscape, or when LADBS requests geotechnical reports for hillside-adjacent lots. Under Haven Standard Clause 1, your written price is locked at signing; no door-side upsells, no scope creep.
Neighborhoods We Serve in West Los Angeles
Our crews work throughout the Westside, with dispatch and scheduling coordinated from our Los Angeles office. Typical response for site visits is next business day across the full service area.
- Palms
- Mar Vista
- Sawtelle
- West Los Angeles (city-designated area)
- Rancho Park
Service Area - Cities Near West Los Angeles
We serve homeowners across the greater Los Angeles metro, with dedicated city pages and local pricing for Burbank, CA, North Hollywood, CA, Glendale, CA, and Studio City, CA. Each city has its own permit environment, housing stock, and pricing realities, and we adjust our permit sets and scopes accordingly.
Serving West Los Angeles, CA - Our Local Coverage Area
We’re based in the West Los Angeles 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 About ADU in West Los Angeles
City of LA’s Standard Plan Program allows over-the-counter permitting in days for qualifying designs, but most custom projects still face 3-6 month plan-check queues. We design to Standard Plan criteria where possible to accelerate your timeline. Call (747) 322-4648 to see if your project qualifies.
California law prohibits HOAs from outright banning ADUs, but some West Los Angeles condo associations and PUDs impose design guidelines that affect exterior materials and setbacks. We review your CC&Rs during the feasibility phase and design to comply without compromising the unit’s function.
We can, but our single-contract model works best when we produce the permit set because we bear full responsibility for buildability and code compliance. If you have drawings in hand, we offer a Free Second Opinion to identify gaps before you commit to a build contract elsewhere.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What West Los Angeles Customers Say
"They walked us through setbacks and utility capacity before we paid anything, and told us one of our two options was not going to get approved."
- Mireille T."Garage conversion finished on the drawings and close to the schedule. They were honest that the sewer connection was the unknown, and it was."
- Arjun D."Every allowance was itemised at the start, so the finish selections did not turn into a surprise at the end."
- Benedict H.