Trusted Garage Conversion ADU for Los Angeles Homeowners
A garage conversion ADU in Los Angeles typically runs $85,000-$180,000 all-in, from measured drawings through final inspection, depending on whether your garage is attached, detached, or a carport requiring full foundation work. Since 2015, Ellery ADU Studio has designed, permitted, and built over 900 ADUs across Los Angeles, Culver City, and West Los Angeles, every one at a written price locked before work starts under Haven Standard Clause 1. If you’re sitting on an underused garage in Venice, Westchester, or Studio City, you’re looking at one of the fastest paths to rental income or multigenerational housing in a city where every square foot counts.
We’re not a contractor who outsources drawings to a drafter you’ve never met. We’re a design-build studio: our architects, permit expediters, and construction crews work under one contract at one written price. That means when the inspector flags a setback variance in West Hollywood or a fire separation issue in Beverly Hills, there’s no designer blaming the builder or vice versa. We fix it. And we document every visit with dated photos you receive, not a verbal summary that evaporates.
Call (424) 551-7706 to schedule your free estimate. A live person answers 24/7.
What Our Garage Conversion ADU Service Includes
Attached Garage Conversion
An attached garage conversion ADU uses the wall shared with your main house, which means fire-rated drywall assemblies and sometimes a separate meter for gas and electric depending on your Los Angeles Department of Building and Safety (LADBS) zone. We see these most often in postwar neighborhoods like Westchester and Sherman Oaks, where 1950s ranches have two-car garages sitting under the same roofline as the living room. Ellery measures the existing slab thickness, checks the foundation for stem-wall continuity, and produces a permit set that addresses the utility separation LADBS requires when the ADU shares a wall with primary residence. Our crews then build to that permit set, and the 365-Day Done Right Promise applies to every stud and junction box.
Detached Garage Conversion
A detached garage conversion ADU stands alone on your lot, which simplifies fire separation but often triggers stricter setback rules and utility trenching across the yard. In hillside neighborhoods like Studio City or parts of West Los Angeles, we regularly encounter grade differentials that require engineered retaining walls or stepped foundations to keep the converted structure within LADBS height limits. Ellery’s permit set includes the civil and structural calculations upfront, not as change orders after demolition starts. We’ve converted detached garages in Santa Monica and Venice where the original 1920s foundation was rubble trench, and we specified a new monolithic slab with post-tensioned cable reinforcement to meet current seismic code.
Carport Conversion
A carport conversion ADU starts with less than a garage: no walls, often no slab, sometimes just a roof on posts. In Inglewood and Hawthorne, we see carports built in the 1970s on thin concrete or even compacted gravel, which means full foundation work before walls go up. The permit set must show new footings, slab, and sometimes drainage regrading if the carport sat at a low point on the lot. Ellery prices this as a single line item in your written quote, not a surprise buried in site prep. We also coordinate with Los Angeles Department of Water and Power (LADWP) for new service drops when the carport never had electrical to begin with.
Garage Partition & Bathroom Add
A garage partition and bathroom add splits an existing garage into a functional ADU while adding the plumbing rough-in for a full bath, kitchenette, or both. This is common in Los Angeles where homeowners want to keep one parking bay and convert the other, or where a long two-car garage can yield a studio plus storage. The permit set must show the new partition wall as a one-hour fire assembly if it separates sleeping space from garage space, and the floor drain or trench drain placement for the bathroom wet area. Ellery’s plumbers rough in to the existing sewer lateral or specify a sewage ejector pump if the garage slab sits below the main house drain line, which we encounter in flat neighborhoods near Venice Boulevard and in parts of Culver City.
Garage JADU
A garage JADU, or Junior ADU, is a conversion of 500 square feet or less within your existing garage, created inside the footprint of your primary residence’s zoning envelope. Unlike a full ADU, a JADU can share bathroom and kitchen facilities with the main house, though most Los Angeles homeowners opt for a small efficiency kitchen and three-quarter bath to maximize rental appeal. The permit set is lighter, but LADBS still requires owner-occupancy verification and often a deed restriction recorded with the County. Ellery handles the zoning verification, produces the JADU-specific permit set, and builds to the same Haven Standard as our full ADUs, with the written price locked before any wall comes down.
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.
Brands We Specify and Coordinate for Garage Conversion ADU
Ellery ADU Studio specifies and coordinates prefab and modular systems within the same single-contract design-build model that governs our stick-built conversions. For exterior cladding and trim on garage conversion ADUs across Los Angeles, we regularly specify James Hardie fiber-cement siding, particularly the HardiePanel vertical boards for modern infill projects in Venice and West Hollywood where the design review board wants material continuity with the primary residence. We’ve detailed Hardie trim assemblies for dozens of conversions and understand the 1/4-inch gap rules and corrosion-resistant fastener schedules that keep the warranty intact in coastal salt air.
When a Los Angeles homeowner wants a faster path to a detached structure or a fully modular solution, we coordinate Abodu and Cover systems within the same written-price contract. Abodu’s one-bedroom units work well on tight lots in Santa Monica and Culver City where crane access is limited; Cover’s panelized system allows us to adapt rooflines to existing garage demolition footprints in hillside areas like Studio City. Whether your project calls for James Hardie cladding on a stick-framed conversion or a coordinated modular drop from Abodu or Cover, the permit set, the price, and the 365-Day Done Right Promise stay under one roof.
Signs You Need Garage Conversion ADU Right Now
- Your garage has become expensive storage. In Los Angeles, where median rent for a studio exceeds $2,000, a garage storing holiday decorations and old bikes is an asset bleeding value every month. We regularly meet homeowners in Beverly Hills and West Los Angeles who’ve paid property taxes on that square footage for a decade without generating income.
- Your household needs flexible space for aging parents or adult children. The multigenerational trend isn’t abstract in our market; it’s a Venice homeowner whose mother needs ground-level access, or a Hawthorne family whose college graduate needs two years to save for a down payment. A garage conversion ADU keeps family close without the friction of shared hallways.
- Your garage structure is deteriorating faster than you’re maintaining it. Cracked slabs, rotting door jambs, and failing roofs don’t fix themselves, and in Los Angeles’ dry-then-wet climate, deferred maintenance accelerates. We’ve converted garages in Inglewood where the cost of repairing the existing structure approached the cost of conversion; the homeowner chose the path that added value.
- You’re facing a zoning change or permit fee increase. California’s ADU-friendly legislation has a shelf life; local jurisdictions adjust fees and parking requirements as political pressure shifts. Los Angeles has maintained relatively permissive rules since 2017, but we’ve seen Culver City and Santa Monica tighten design review. Converting now locks in your entitlements under current law.
- You have a written estimate from another firm that feels vague or incomplete. This is the exact scenario Haven Standard Clause 1 was written for. Ellery offers a Free Second Opinion on any written estimate already in hand; we’ll tell you what’s missing, what’s overstated, and whether the permit set actually addresses your specific LADBS zone.
Our Garage Conversion ADU Process - Step by Step
- 1
Site measure and zoning verification. We visit your property in Los Angeles with laser measure, moisture meter, and camera. We record the existing slab dimensions, ceiling height, electrical panel capacity, and sewer lateral location. You receive dated photos of everything we found, not a summary of how it felt. Our permit expediter runs a preliminary zoning report the same week.
- 2
Design and permit set production. Our architects produce construction drawings, structural calculations, and Title 24 energy compliance documentation. For garage conversions in hillside areas like Studio City or Sherman Oaks, this includes geotechnical referral if the soils report is outdated. The permit set is the core product, not an afterthought.
- 3
Written price presentation. Under Haven Standard Clause 1, you receive a line-item written quote before any work begins. Every category, from demolition to final paint, shows a fixed price with no change-order clause unless you alter the scope. We don’t do “allowances” that balloon later.
- 4
Permit submission and correction cycle. Ellery submits to LADBS or your local jurisdiction and manages the plan-check corrections. In Los Angeles proper, this typically takes 8-14 weeks depending on backlog. We update you weekly with the status, not when you call asking.
- 5
Construction and final inspection. Our background-checked, uniformed crews build to the permitted drawings. Every site visit generates a documented photo record you receive. After LADBS signs off, the 365-Day Done Right Promise begins: if it’s not built to the permit set, we make it right, in writing.
How Much Does Garage Conversion ADU Cost in Los Angeles?
A typical attached garage conversion ADU in Los Angeles runs $85,000-$125,000 all-in, drawings through final inspection-see our garage conversion ADU cost guide for full details. Detached garage conversions with good existing slabs fall in the $110,000-$160,000 range. Carport conversions, which need full foundation and often new electrical service, typically land at $140,000-$180,000. Garage partition and bathroom adds start around $45,000 for a simple wet-bar and half-bath partition, scaling to $75,000 for a full kitchenette and three-quarter bath with separate HVAC. Garage JADUs, being smaller and sharing some systems, generally range $60,000-$95,000.
| Project Type | Typical Range (Los Angeles) | Key Cost Driver |
|---|---|---|
| Attached Garage Conversion ADU | $85,000 - $125,000 | Utility separation, fire-rated assemblies |
| Detached Garage Conversion ADU | $110,000 - $160,000 | Foundation condition, utility trenching |
| Carport Conversion ADU | $140,000 - $180,000 | New slab, drainage, electrical service |
| Garage Partition & Bathroom Add | $45,000 - $75,000 | Plumbing rough-in, HVAC separation |
| Garage JADU | $60,000 - $95,000 | Size, owner-occupancy documentation |
What moves you within these ranges? Four factors: existing foundation condition, utility capacity and distance to main lines, LADBS plan-check backlog, and finish level. A garage in Venice with a 6-inch post-tensioned slab, 200-amp panel, and sewer lateral 15 feet away sits at the low end. A hillside garage in Studio City with rubble foundation, 100-amp service, and a 75-foot utility trench hits the high end. Under Haven Standard Clause 5 (No Surprises), your written quote locks these variables at signing; no door-side upsells, no scope creep when the drywall comes off and something unexpected appears.
How to avoid overpaying: get a permit set, not just a sketch. We’ve reviewed competitor quotes where the “design fee” bought nothing submittable to LADBS, leaving the homeowner to pay twice. Our free estimate includes a preliminary zoning verification and a realistic construction timeline. Call (424) 551-7706 for yours.
Garage Conversion ADU Near Los Angeles - Our Service Area
Ellery ADU Studio works across Los Angeles proper and the immediate metro core, with active projects and permit relationships in Garage Conversion ADU in Culver City, Garage Conversion ADU in West Los Angeles, Santa Monica, Venice, Westchester, Beverly Hills, West Hollywood, Inglewood, Hawthorne, Studio City, and Sherman Oaks. Typical site measure scheduling is 3-5 business days from your call. Permit submission timing varies by jurisdiction; LADBS is generally 8-14 weeks, Culver City and Santa Monica can run 12-18 weeks depending on design review queue. We maintain relationships with plan checkers in each office and know the correction cycles by heart, which saves weeks on resubmittal.
Serving Los Angeles, CA - Our Local Coverage Area
We’re based in the 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.
Frequently Asked Questions - Garage Conversion ADU in Los Angeles
A garage conversion ADU transforms an existing garage into a legally permitted accessory dwelling unit with its own kitchen, bathroom, sleeping area, and separate entrance. In Los Angeles, this is one of the most cost-effective ADU types because you’re working within an existing footprint, avoiding the setback and lot-coverage math that complicates new detached construction. Ellery’s design-build model covers the permit set, construction, and final inspection under one written price.
From signed contract to certificate of occupancy, most garage conversion ADUs in Los Angeles take 8-14 months: 2-4 months for permit set and plan check, 4-8 months for construction, and 2-4 weeks for final inspection and utility activation. Detached conversions with utility trenching or hillside foundations run longer; attached conversions with straightforward electrical tie-ins can move faster. Your written quote includes a timeline specific to your LADBS zone and project type. Call (424) 551-7706 for an exact schedule - estimates are free.
Garage conversion ADUs in Los Angeles typically range from $85,000 for a simple attached conversion to $180,000 for a carport requiring full foundation and new utilities, with most projects clustering between $110,000 and $150,000. The final price depends on foundation condition, utility capacity, finish level, and jurisdiction-specific requirements like Santa Monica’s design review or hillside geotechnical reports. Under Haven Standard Clause 1, Ellery provides a written line-item price before any work begins - never an estimate that balloons later. Call (424) 551-7706 for your specific quote.
Yes. Ellery specifies and coordinates prefab and modular systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie within the same single-contract design-build model. For garage conversion ADU projects, we most often use James Hardie cladding on stick-framed conversions, or coordinate Abodu and Cover systems when the project involves demolishing a failing garage and replacing it with a modular unit. The permit set, written price, and 365-Day Done Right Promise apply regardless of construction method.
No. Garage conversion ADU is planned construction, not emergency repair. We do not promise same-day or rush timelines because permit submission, plan check, and inspection scheduling are governed by LADBS and other jurisdictions, not by our dispatch calendar. What we do promise is transparent weekly updates and a live person who answers your call 24/7 to give you real status, not a callback promise that doesn’t materialize. If you have a structural emergency in your garage, we can refer you to a structural engineer; for planned ADU work, we move as fast as permits and quality allow.
Ellery backs every garage conversion ADU with the 365-Day Done Right Promise: if the finished ADU is not built to the permitted drawings, we make it right, in writing, before the project starts. This covers workmanship, material installation, and code compliance. Manufacturer warranties on fixtures, appliances, and systems like James Hardie siding or Abodu structural elements run separately and are transferred to you at closeout. Haven Standard Clause 7 documents exactly what is covered and for how long; you receive a copy at contract signing.
Clear the garage of vehicles and bulky items so we can measure slab dimensions, ceiling height, and wall conditions accurately. Locate your electrical panel, gas meter, and main water shutoff; our team will photograph these, but knowing where they are saves time. If you have a previous survey, soils report, or LADBS correspondence, have it ready - it may accelerate our zoning verification. You don’t need drawings or a design concept; we bring the measurement tools and the questions. Call (424) 551-7706 to schedule, and you’ll receive a written price, not a verbal ballpark.
Schedule Your Garage Conversion ADU Service in Los Angeles Today
Call (424) 551-7706 to schedule your free estimate. A live person answers 24/7. You’ll receive a site measure, preliminary zoning verification, and a written line-item price before any work begins - that’s Haven Standard Clause 1, and it’s how we’ve operated since 2015. Whether you’re in Venice, Westchester, Studio City, or anywhere across Los Angeles, your garage is already on your property; the only question is whether it’s generating value or just collecting dust.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Los Angeles since 2015.