Most homeowners don’t think seriously about converting their garage until a neighbor mentions what their ADU rents for. Then the math changes everything. A single-car garage in the San Fernando Valley, properly converted and permitted, rents for $1,800-$2,400 a month. At $2,000 per month, that’s $24,000 a year in income — from a structure you’re currently using to store bikes and holiday decorations.
The question isn’t really ‘how much does a garage conversion cost.’ The question is what it costs versus what it returns. This guide covers both.
Kobzev Pro has completed garage-to-ADU projects across Los Angeles County, including Encino, Sherman Oaks, Studio City, and Woodland Hills. The numbers below reflect what we’re actually seeing in 2026, not national averages.
The Rental Math: Why It Makes Sense
Before diving into costs, understand what you’re buying. A permitted garage ADU in Los Angeles does three things: it generates rental income, it adds property value, and it gives you a legal, marketable asset if you ever sell.
| Scenario | Project Cost | Monthly Rent | Break-Even |
| Single-car garage, basic ADU | $90,000 | $1,800/mo | ~50 months |
| Single-car garage, full ADU | $130,000 | $2,200/mo | ~59 months |
| Two-car garage, 1BR ADU | $175,000 | $2,600/mo | ~67 months |
Rental estimates based on San Fernando Valley market, Q1-Q2 2026. Break-even assumes net rent after ~15% expenses. Individual results vary.
Beyond rental income, a permitted ADU typically adds $120,000-$200,000 to a property’s appraised value in LA County, depending on neighborhood and unit quality. Use our ADU Cost Calculator to get a preliminary project estimate before you call anyone.
What Actually Drives the Cost of a Garage Conversion in LA
Online estimates are wide because the variables are wide. Two garages that look identical from the street can differ by $50,000 in project cost depending on what’s behind the walls. Here is what moves the number:
- Scope — room vs. full ADU: Adding a kitchen and bathroom is the single biggest cost driver. A finished room without plumbing runs $25,000-$90,000. A legal ADU with kitchen, bath, and separate entry starts at $65,000 and typically runs $90,000-$190,000.
- Structure and foundation: Older garages in LA often need slab repair, seismic retrofitting, or wall reinforcement before they can legally be occupied. We assess this on-site before quoting.
- Utility distance: A garage attached to the main house is cheaper to connect to sewer, water, and gas than a detached structure at the back of a deep lot. Trenching across 60 feet of yard adds real cost.
- Electrical panel upgrade: Most older homes need a 100A-to-200A panel upgrade and a dedicated subpanel for the ADU. Budget $8,000-$15,000 if your panel is original.
- Title 24 energy compliance: California requires specific insulation levels, high-efficiency windows, and an energy report. Non-negotiable for permitted work.
- Finishes: The difference between rental-grade and owner-quality finishes can be $20,000-$40,000 on the same structure.
- Design, engineering, and permits: Architectural plans, structural engineering, and LADBS plan-check. See permit fees below.
Garage to Room vs. Garage to ADU – The Cost to Convert Gap
There are two very different projects that both get called a “garage conversion”. Understanding which one you’re doing is the first decision.
| Garage to Room / Office | Garage to Full ADU (Permitted) |
| No kitchen, no full bathroom | Kitchen + bathroom + separate entry |
| $25,000-$90,000 typical range | $90,000-$190,000 typical range |
| No rental income (not a legal unit) | Legal rental unit, generates income |
| Simpler permits (building only) | Full LADBS permitting package |
| Adds square footage to home | Adds independent legal unit to property |
If rental income is the goal, the full garage-to-ADU conversion is the only path. A non-permitted room conversion can’t be legally rented and complicates your title when you sell.
Garage Conversion Cost by Size (2026, Los Angeles)
| Garage Type | Approx. Sq Ft | ADU Cost Range | Best Use |
| Single-car | 200-280 sq ft | $80,000-$150,000 | Studio or JADU |
| Two-car | 350-500 sq ft | $110,000-$220,000 | 1-bedroom ADU |
Larger garages cost more in total but less per square foot — and a one-bedroom unit is significantly more rentable than a studio. If you have a two-car garage and budget allows, the extra square footage usually pays for itself in higher rent.
For comparison, a ground-up detached ADU in LA typically runs $150,000-$300,000+ — more expensive because you’re building foundation, framing, and roof from scratch. A garage conversion reuses the existing structure, which is why it’s the most cost-effective path into ADU ownership.
LADBS Permit Fees for Garage Conversions (2026)
Every garage conversion that touches structure, electrical, plumbing, or egress requires permits from LADBS. Budget these into your project from the start:
- Plan-check fee: $1,500-$3,500 (based on project valuation)
- Building permit fee: $2,500-$5,500
- Total typical permit cost: $3,000-$10,000 for most conversions
Two important savings specific to garage conversions: impact fees are waived for ADUs under 750 sq ft and JADUs under 500 sq ft, and school fees are waived for garage conversions under California state law. A 450 sq ft garage ADU avoids both — this alone can save $15,000-$25,000 compared to new construction.
As a licensed Class B General Contractor (CSLB #1148495), Kobzev Pro prepares the plans, coordinates structural engineering, and handles the LADBS application. You don’t manage that process — we do.
California ADU Laws That Lower Your Conversion Garage Cost and Timeline
State law has removed most of the traditional barriers to garage conversions. Key provisions as of 2026:
- 60-day ministerial approval: LADBS must approve a complete ADU application within 60 days, with no neighborhood hearings or discretionary review.
- No replacement parking required: You don’t have to build new parking spaces when you convert a garage.
- No owner-occupancy requirement: You can rent out both the main house and the ADU simultaneously.
- Setback exemption: An existing garage footprint is exempt from the standard 4-foot setback rule, as long as you don’t expand it.
- AB 1332 pre-approved plans: Cities must offer pre-approved ADU plans, which can shorten plan-check significantly.
- AB 2533 legalization: Unpermitted garage conversions built before January 1, 2020 can be legalized; the city cannot deny a permit solely due to code issues that don’t threaten health and safety.
Have more questions about the process? Our FAQ page covers common permit, timeline, and process questions in detail.
How Long Does a Garage Conversion Take in LA?
Most straightforward garage-to-ADU conversions take 5-9 months from first site visit to final inspection and move-in. Here’s how that breaks down:
- Design and engineering: 4-6 weeks — Architectural plans, structural drawings, Title 24 energy calculations.
- LADBS plan-check and permit issuance: 4-12 weeks — Depends on project complexity and current city workload. Pre-approved plan sets (AB 1332) can shorten this significantly.
- Construction: 10-16 weeks — Framing, rough mechanical, insulation, drywall, finishes, inspections at each phase.
Complex projects — significant structural work, detached garages with long utility runs — can run longer. We give you a realistic schedule before we start, and we update you at each milestone.
How to Get Your Actual Number
A calculator gives you a range. An on-site visit gives you a number.
When we visit your property, we look at the garage structure and foundation condition, how far utilities need to run, your goal (room, studio ADU, or full one-bedroom), and your finish preferences. From that, we produce a written estimate with a clear scope — not a guess.
Start with our ADU Cost Calculator for a ballpark, then book a free on-site estimate. There’s no obligation and no sales pressure — we want you to have accurate information before you make any decision.
You can also review completed projects in our gallery or read what our clients say. If you’re deciding whether to hire a general contractor or manage subs yourself, our blog post on how to choose the right contractor is worth reading first.
Other ADU Options If a Garage Conversion Isn’t the Right Fit
A garage conversion is the most affordable path into ADU ownership — but it’s not the only one. If you don’t have a garage, or want a larger or more flexible unit:
- Detached ADU (new construction) — kobzevpro.com/services/detached-adu/: Built from the ground up on your lot. More flexibility in size and layout; higher cost, typically $150,000-$300,000+.
- Attached ADU (room addition) — kobzevpro.com/services/attached-adu/: An addition connected to the main house. Shares a wall, often simpler utility connections.
- Full ADU construction overview — kobzevpro.com/services/adu-construction/: Covers all ADU types with full design, permitting, and build services.
Ready to See What Your Convert Garage Is Worth?
Get a preliminary estimate in minutes with our ADU Cost Calculator, then book a free on-site visit. No sales pressure, no obligation — just a clear number and a realistic plan.
Kobzev Pro is a licensed general contractor (CSLB #1148495) serving Los Angeles County, including Encino, Sherman Oaks, Studio City, Woodland Hills, Santa Monica, and the San Fernando Valley. Contact us to schedule your free estimate.