Garage Conversion ADU Cost - Plans, Permits & Build, One Fixed Price

How Much Does Garage Conversion ADU Cost in West Hollywood?

Our Garage Conversion ADU services in West Hollywood typically cost $95,000 to $220,000 all-in – drawings through final inspection – depending on the garage’s existing condition, the finish level you choose, and how much utility work the site requires. Most West Hollywood homeowners converting a standard detached two-car garage land between $130,000 and $175,000 when the slab is sound, the setbacks clear, and the finish spec is mid-range. Every Ellery ADU Studio project is quoted at a written price before any work begins, per Haven Standard Clause 1, so the number you see at the start is the number you see at the end.

Garage Conversion ADU Cost Breakdown (2026)

The table below reflects actual project costs in the West Hollywood market as of 2026. These are not national averages adjusted by a zip-code multiplier. They come from permits pulled, slabs poured, and inspections passed in WeHo and the immediately surrounding neighborhoods – West Hollywood Hills, Norma Triangle, Santa Monica Boulevard corridor, and the residential blocks south of Melrose.

The spread between $95,000 and $220,000 is real, and it’s not evasion. An Attached Garage Conversion on a 400-square-foot single-car garage with a clean slab, already at 200-amp electrical service, converting to a modest studio with stock cabinets and LVP flooring: that’s the low end. A 600-square-foot two-car garage in the hills, a cracked slab that needs a full structural engineer review, a custom kitchen, spa-quality bath, and a James Hardie exterior to match a recently renovated main house: that’s the high end. Nadia Ellery reviews every project scope before a number goes to the client, because a quote written without a site visit isn’t a quote – it’s a starting point for change orders.

What Affects Garage Conversion ADU Pricing in West Hollywood

West Hollywood is a 1.9-square-mile city with its own building department, its own permit fee schedule, and a housing stock that runs from 1920s Spanish Colonial bungalows near Havenhurst to 1960s post-and-beam structures up in the hills. The factors below are specific to this market – not generic variables copy-pasted from a statewide ADU guide.

• Slab condition and foundation type. West Hollywood sits in a high seismic zone, and older garages – particularly those built before 1980 in the Norma Triangle and West Hollywood Hills areas – frequently have 3-inch slabs that don’t meet current load requirements for habitable space. A structural engineer’s report ($1,200-$2,500) is standard on any pre-1980 garage. If the slab needs thickening or a new pour, add $8,000-$22,000 before any other line item moves.
• Distance from existing utilities. A detached garage sitting 80 feet from the main house on a deep lot – common along the residential side streets south of Santa Monica Boulevard – means a long plumbing run, a long conduit run, and sometimes a separate water meter tap. That distance adds cost in a way that a 25-foot setback garage does not. When Ellery reviews a site, the as-built location of the existing sewer lateral and water main goes into the written quote before anything is signed.
• Electrical service capacity at the main house. A surprising number of West Hollywood properties, particularly in the blocks between Fountain and Melrose, still run 100-amp main service. Adding an ADU to a 100-amp panel is not just inconvenient – it’s a code issue. A service upgrade to 200-amp at the main panel runs $4,000-$8,500 and is a prerequisite, not a maybe.
• Setback and zoning compliance. West Hollywood’s R1B and R1C zones have different setback rules, and some garages along the alley networks in the Eastside neighborhood sit closer to the rear property line than current code allows for habitable space. If a variance or administrative exception is needed – and in West Hollywood, the planning department does grant them for ADU conversions in specific cases – that adds $2,500-$6,000 in application costs and 60-120 days to the timeline. Ellery pulls the zoning file before the project is quoted, not after.
• Finish level and kitchen/bath specification. This single variable accounts for more cost variation than any other. Rental-grade LVP flooring, stock IKEA-style cabinets, and a prefabricated shower surround: $18,000-$28,000 for interior finishes. White oak hardwood, custom cabinetry, a wet room tile bath, and a fully equipped kitchen with a 30-inch range: $45,000-$55,000. Both are legitimate depending on whether the ADU is for a rental tenant, an aging parent, or a guest suite you plan to use yourself.
• Garage door opening treatment. The front-facing garage door opening is the most architecturally visible decision in a WeHo conversion. Options range from a simple infill wall with a new window and door ($4,500-$7,000) to a full glass-and-steel sliding system that opens the ADU to a private courtyard ($18,000-$30,000). What you do here sets the character of the finished unit and directly affects resale and rental value on a block where buyers notice design.
• Title 24 energy compliance requirements. California’s Title 24 energy code is strict, and West Hollywood enforces it fully. An uninsulated garage needs a complete thermal envelope: wall insulation, roof insulation, low-e glazing on all windows, and often an energy modeling report to confirm compliance. Budget $2,500-$5,000 for the compliance work beyond basic insulation and drywall if the structure is starting from zero.

Before

After

West Hollywood-Specific Permit and Process Considerations

West Hollywood operates its own building and planning department, separate from the City of Los Angeles. That distinction matters more than most homeowners realize. WeHo’s ADU ordinance aligns with AB 2221 and AB 916 – the state laws that streamlined ADU approvals starting in 2020 – but the city adds its own design guidelines, particularly for properties in historic overlay zones. The blocks near Laurel Avenue and the Spanish Colonial Revival clusters near Kings Road fall into review categories that can add a planning check before building permits are issued.

West Hollywood Water, the city’s utility, bills separately from LADWP for water service. If your garage is on the LADWP electrical grid but WeHo Water for plumbing – which applies to most properties west of La Brea – the service connection process involves two separate utility departments with different inspection schedules. Ellery coordinates both as part of the single contract; you don’t manage two separate vendor relationships.

Permit timelines in West Hollywood for an ADU garage conversion run approximately 8-16 weeks from complete submittal to permit issuance when the application is clean. A clean submittal means the permit set is complete, all energy compliance documents are attached, and the planning department’s ADU checklist is satisfied on the first round. Incomplete submittals – which happen when a designer and a builder are working on separate contracts and the coordination breaks down – can add 4-10 weeks of back-and-forth. The Ellery single-contract model means the permit set is the design team’s product, reviewed internally before it leaves the office.

For homeowners who want to review the full scope of what a garage conversion entails in this city, our Garage Conversion ADU in West Hollywood page covers the process from zoning check through final inspection in detail.

How to Save on Garage Conversion ADU Costs in West Hollywood

There are legitimate ways to keep costs down without compromising the finished unit. And there are false economies that look like savings until the city flags them or the tenant moves out.

• Confirm the slab before you design anything. Paying $1,200-$2,500 for a structural engineer’s slab assessment before the design phase starts sounds like an added cost. It is actually the cheapest possible way to find out whether the foundation will require a full re-pour – because discovering that during permit review, after you’ve paid for drawings, costs far more. Ellery includes this assessment in the site-review phase before the written quote is issued.
• Choose a mid-range finish package and spec it in writing upfront. The finish level is the largest variable in the entire budget. Committing to a specific finish spec at signing – stock cabinet line, flooring product, fixture allowances by line item – locks the cost and prevents the incremental upgrades that add $15,000-$25,000 to projects where the scope wasn’t frozen. Haven Standard Clause 5 (No Surprises) locks the scope at signing. No door-side upsells, no scope creep.
• Use the existing footprint. Every square foot of garage space you add through a bump-out or roof raise requires new permits, new structural calculations, and new foundation work. Converting the existing footprint only – without expanding the building envelope – keeps permit fees lower and avoids triggering additional plan checks. If the garage is 480 square feet, design a 480-square-foot ADU before considering whether to expand.
• Get a second opinion on any estimate already in hand. Ellery offers a Free Second Opinion on any written estimate. If you’ve received a bid that seems high, low, or incomplete, bring it in. A line-by-line review against the WeHo permit fee schedule and current subcontractor rates takes about 45 minutes and costs nothing. The goal isn’t to undercut the other number – it’s to tell you what the line items actually represent, so you can make a decision with full information.
• Don’t defer utility upgrades to a later phase. Some homeowners ask whether the electrical panel upgrade can be done “later.” It cannot – not if the ADU is to pass final inspection. The panel upgrade is a prerequisite for the electrical permit sign-off. Phasing it separately doesn’t save money; it creates a second mobilization cost and a second permit. Do it in the same contract.
• Ask specifically about James Hardie exterior vs. stucco. Standard stucco over a wood-framed conversion runs $8,000-$14,000 for a typical WeHo garage. James Hardie fiber cement adds $3,000-$5,000 upfront but has a significantly longer maintenance cycle and better fire resistance – which matters in a dense urban neighborhood where homes sit close together. On a property you intend to hold for 10+ years, the Hardie spec often wins on total cost of ownership even if the initial number is higher.

For a written price on your specific garage – square footage, slab condition, utility situation, and finish level – call (213) 329-7167. A live person answers. The price goes in writing before any work starts.

How the Ellery Design-Build Model Affects Your Total Cost

Most ADU cost problems don’t start in construction. They start in the gap between the designer’s drawings and the builder’s interpretation of them. A designer specifies a window. The builder substitutes a cheaper one. The city flags the substitution during inspection. Someone has to fix it, and each party points at the other. That gap – the designer-versus-builder blame gap – is where projects stall, budgets rupture, and West Hollywood homeowners spend six months in dispute rather than collecting rent or welcoming a family member into a finished unit.

Ellery ADU Studio covers design, permitting, and construction under a single contract at a single written price. Nadia Ellery leads the design review on every project, which means the permit set that goes to the City of West Hollywood building department and the scope that goes to the construction crew are the same document, written and owned by the same firm. If the finished ADU isn’t built to the permitted drawings, the 365-Day Done Right Promise – backed in writing before the project starts – covers the correction. Not a verbal assurance. A written commitment, in the contract, before the first permit is filed.

Since 2015, the studio has designed, permitted, and built more than 900 ADUs, every one with a written price before work started and a documented photo record at each stage of construction. The photo record isn’t a marketing gesture – it’s the documentation that protects both parties if a question arises about what was done inside a wall before it was closed. West Hollywood’s inspection process is thorough, and having a photo record of every rough-in stage means the answer to “what’s behind that wall?” is never “we think it’s fine.”

You can see more about how this applies across the full range of ADU work we do in West Hollywood on our home page, which outlines all five service categories under the single-contract model.

Typical West Hollywood Garage Conversion ADU Timeline

Cost and time are inseparable in a construction project, because carrying costs – mortgage interest, deferred rental income, delayed family move-in – are real expenses even when they don’t appear on the contractor’s invoice. Here’s a realistic timeline for a West Hollywood garage conversion in 2026.

• Site assessment and written quote: 1-2 weeks. Includes slab assessment, utility confirmation, zoning file review, and finish-level discussion. The written price is issued at the end of this phase, per Haven Standard Clause 1.
• Design and permit set preparation: 4-8 weeks. Architectural drawings, structural calculations, Title 24 energy compliance report, and the full permit package assembled for City of West Hollywood submittal.
• Permit review and issuance: 8-16 weeks. WeHo’s building department processes ADU applications in roughly this window when the submittal is complete. Incomplete submittals extend this significantly.
• Construction: 10-18 weeks. Depends on scope. A straightforward studio conversion with no slab work runs 10-12 weeks. A two-bedroom conversion with full slab repair, panel upgrade, and high-spec finishes runs 16-18 weeks.
• Final inspection and Certificate of Occupancy: 1-3 weeks. WeHo schedules final inspections within 1-2 weeks of request. A clean inspection – meaning the finished unit matches the permitted drawings precisely – passes first time.

Total elapsed time from signed contract to move-in: approximately 6-12 months, depending on permit timing. The construction phase is not the long part. The permit phase is. A complete, correctly prepared permit set – the core product at Ellery – is the single most effective way to compress that window.

FAQs – Garage Conversion ADU Cost in West Hollywood

How much does a garage conversion ADU cost in West Hollywood in 2026?

A garage conversion ADU in West Hollywood costs $95,000 to $220,000 all-in, drawings through final inspection, with most mid-range projects landing between $130,000 and $175,000. The primary cost drivers are slab condition, distance from existing utilities, electrical service capacity, and finish level. Every Ellery project is quoted at a fixed written price before work begins – call (213) 329-7167 and a live person will schedule your site assessment.

What are the permit fees for a garage conversion ADU in West Hollywood?

West Hollywood permit fees for a garage conversion ADU typically total $4,500 to $11,000, covering the ADU permit itself plus separate building, mechanical, electrical, and plumbing permits. West Hollywood charges per-trade, so the total is higher than a single-fee jurisdiction. These fees are included in Ellery’s written quote as a line item – there are no permit fee surprises billed after signing, per Haven Standard Clause 5.

Is a garage conversion ADU cheaper than building a new detached ADU in West Hollywood?

Yes, in most cases. A Carport Conversion or garage conversion typically costs 20-35% less than a comparable new detached ADU in West Hollywood because the structural shell already exists. A new detached ADU on a West Hollywood lot runs $180,000 to $320,000 all-in depending on size and finish. The conversion saves primarily on framing, roofing, and foundation costs – though if the existing garage slab requires full replacement, that gap narrows. A site assessment ($0 at the quote stage with Ellery) will tell you specifically which scenario applies to your property.

How long does a garage conversion ADU take in West Hollywood?

From signed contract to Certificate of Occupancy, a West Hollywood garage conversion ADU typically takes 6-12 months. The permit review phase at the City of West Hollywood building department runs 8-16 weeks for a complete submittal. Construction after permit issuance runs 10-18 weeks depending on scope. The most reliable way to keep this timeline from extending is a complete, correctly prepared permit set on the first submittal – which is why Ellery treats the permit set as the core product, not an afterthought.

What is the return on investment for a garage conversion ADU in West Hollywood?

A finished garage conversion ADU in West Hollywood typically rents for $2,200 to $3,800 per month in 2026, depending on size, finish level, and location within the city. At $2,800/month on a $145,000 all-in conversion, the gross annual return is approximately 23% of total project cost – a payback period of roughly 4-5 years before accounting for property value appreciation. West Hollywood’s rental vacancy rate is among the lowest in LA County, which supports stable occupancy. These are market figures, not projections Ellery guarantees – but they’re the numbers that inform how most of our West Hollywood clients think about the investment decision. Call (213) 329-7167 for a written quote on your specific garage.

Does Ellery ADU Studio offer financing or payment structure options for garage conversion projects?

Ellery quotes a single written price for the full project – design, permitting, and construction – under one contract. Payment is structured in milestone-based draws tied to documented construction phases, not billed all upfront. Many West Hollywood homeowners finance the project through a home equity line of credit or a renovation loan; Ellery works with the client’s lender to provide the documentation those products require (licensed contractor information, written scope, permit set). We don’t provide financing directly, but the written price and milestone structure make third-party financing straightforward to arrange.

Key Takeaways

• Garage conversion ADUs in West Hollywood cost $95,000-$220,000 all-in; most mid-range projects land at $130,000-$175,000.
• Permit fees in West Hollywood run $4,500-$11,000 because the city charges per trade permit, not a single flat fee.
• Slab condition, electrical service capacity, and distance from existing utilities are the three variables that move the budget most before finish selections begin.
• West Hollywood operates its own building department, separate from LA; timeline and fee structure differ from LADWP-jurisdiction neighbors.
• The designer-versus-builder blame gap is where most ADU budgets rupture; a single-contract design-build model eliminates it by definition.
• Every Ellery project carries a written price before work starts (Haven Standard Clause 1) and a 365-Day Done Right Promise backed in the contract.
• A Free Second Opinion is available on any written estimate you’ve already received – call (213) 329-7167.

Get a Written Price for Your West Hollywood Garage Conversion

If you’re holding an estimate that doesn’t break out the permit fees, doesn’t list the slab assessment as a line item, or says “call for a quote” where the number should be – that’s worth examining before you sign. Ellery ADU Studio’s written quote covers every line item from the architectural drawings through the final inspection walk, with the price locked at signing under Haven Standard Clause 1. Nadia Ellery reviews every project scope before the quote goes out.

Call (213) 329-7167 to schedule a site assessment. A live person answers. The written price follows the site visit. No voicemail queue, no callback window that turns into a week.

Pricing reflects the West Hollywood market as of 2026. Ellery ADU Studio West Hollywood offers free estimates – call (213) 329-7167.

Written by Nadia Ellery, Owner at Ellery ADU Studio, serving West Hollywood since 2015.