Garage Conversion to ADU : What you need to Know in Los Angeles, Burbank, and Glendale
Posted June 3, 2025
Are you thinking about converting your garage into a rental unit, guest house, or extra living space? A garage conversion ADU (Accessory Dwelling Unit) is one of the most affordable and effective ways to increase property value and generate passive income in Los Angeles, Burbank, and Glendale.
But before you get started, there are a few key things you need to know about the design, permit process, and construction requirements in your city.
In this blog, we’ll break down everything you need to know about garage conversions, including zoning laws, design tips, and what to expect during the process.
What Is a Garage Conversion ADU?
A garage conversion ADU transforms an existing attached or detached garage into a fully livable, permitted unit. This type of ADU typically includes:
A private entrance
Living/sleeping area
Bathroom
Kitchen or kitchenette
HVAC, insulation, and upgraded finishes
Garage conversions are especially popular in Los Angeles, Burbank, and Glendale where many older properties have unused detached garages sitting on large lots — ideal for an affordable ADU build.
Is Garage Conversion Legal in Los Angeles?
Yes — garage conversions are legal in Los Angeles, thanks to California’s statewide ADU laws and LA’s local ordinances supporting housing development.
To qualify, you must meet:
Zoning requirements (R1, RD, R2, and multifamily lots are generally eligible)
Minimum setback rules
Proper fire separation and insulation
Updated electrical, plumbing, and structural conditions
The city of Los Angeles requires you to submit permit-ready plans showing the ADU complies with the California Residential Code, Title 24 energy requirements, and local zoning regulations.
Garage Conversion Process in Los Angeles
Here’s what the typical process looks like when you work with a design professional like I Arch Studios:
Site Evaluation & Feasibility
We assess your garage size, placement, and zoning to determine what’s possible.ADU Layout Design
Custom floor plans are created to make the most of your space — usually between 300 to 500 sq ft.Construction Drawings
We prepare the full set of plans for city review, including site plan, floor plan, elevations, Title 24 energy calcs, and more.Permit Submission
We handle the submittal process with the Los Angeles Department of Building and Safety (LADBS).Construction Begins
Once permits are approved, your contractor can begin transforming your garage into a brand-new ADU.
How Much Does It Cost to Convert a Garage to an ADU in Los Angeles?
Garage conversion costs can range from $80,000 to $130,000+, depending on the size, design, and existing conditions of the garage.
Key factors that impact cost:
Plumbing and sewer tie-ins
Foundation condition
Roof structure and height
Finishes and fixtures
City fees and plan check costs
At I Arch Studios, we help you design efficiently and avoid costly rework by making sure your plans meet all requirements before submitting to the city.
Pro Tips for a Successful Garage Conversion
Maximize ceiling height to avoid feeling cramped
Use open layouts for better flow in small spaces
Incorporate natural light through windows or skylights
Include storage solutions to enhance livability
Add a patio or outdoor space for added value
Why Work With a Design Professional?
While some homeowners go straight to a contractor, working with a designer first ensures:
Your layout is functional and compliant
Your plans get approved faster
You avoid surprises during construction
You get the most out of your investment
At I Arch Studios, we’ve designed garage conversion ADUs all across Los Angeles, Glendale, Burbank, and the San Fernando Valley. We know what each city looks for — and we’ll guide you from first sketch to final permit.
Ready to Start Your Garage Conversion ADU?
Whether you’re a homeowner or investor, converting your garage into a legal ADU is a smart move. It adds rental income potential, boosts property value, and increases livable space — all within your existing lot.
Contact I Arch Studios today to get started with a free consultation. We’ll evaluate your garage, create a custom layout, and help you get city approval — stress-free.
