Should You Convert Your Garage to an ADU?

Joan Aug 08, 2026

Converting a garage into an Accessory Dwelling Unit (ADU) can greatly enhance your living space and even increase your home's value. But is it worth the time, money, and effort? Let's explore the potential benefits and drawbacks to help you decide.

The Definitive Guide to Converting Your Garage into an ADU
The Definitive Guide to Converting Your Garage into an ADU

First, consider the pros and cons, then delve into the planning and costs involved, before making an informed decision on whether to convert that garage into an ADU.

Garage Conversion Vs Detached ADU in San Diego
Garage Conversion Vs Detached ADU in San Diego

Potential Benefits of Converting a Garage to an ADU

Increased Living Space: Turning a garage into a habitable room adds square footage to your home, creating more space for your family or, if you choose to rent it out, generating additional income.

2023 ADU & Garage Conversion Guide For Orange County
2023 ADU & Garage Conversion Guide For Orange County

Increased Home Value: Homes with ADUs often fetch higher prices than those without. According to a report by the California Housing Partnership, homes with ADUs in Los Angeles sold for an average of $146,000 more than similar homes without ADUs.

Legal Requirements and Zoning Laws

Garage Conversion to ADU
Garage Conversion to ADU

Before starting any construction, ensure you understand the legal requirements and zoning laws in your area. Some cities have specific rules about the size, style, and location of ADUs. For instance, California's 2017 ADU legislation simplified the process, allowing ADUs as small as 150 sq. ft.

Some cities may require a conditional use permit or a design review. Always check with your local building department before beginning any project.

Planning and Design considerations

40 Garage Conversion Ideas to Maximize Your Home
40 Garage Conversion Ideas to Maximize Your Home

Designing an ADU involves more than just adding windows and doors to a garage. You'll need to consider insulation, heating and cooling, electrical and plumbing changes, and egress requirements.

A well-planned space includes a living area, a kitchen or kitchenette, and a bathroom. If you're building a larger ADU, consider adding a bedroom or a loft for extra functionality.

Costs Involved in Converting a Garage to an ADU

the kitchen is clean and ready to be used for cooking or dining, while still in use
the kitchen is clean and ready to be used for cooking or dining, while still in use

The cost of converting a garage to an ADU varies significantly depending on the size of the ADU, local building codes, and the extent of renovations needed. According to HomeAdvisor, the average cost ranges from $40,000 to $120,000.

However, this is an investment that can pay off. On average, ADUs in California generate $1,200 - $2,500 in rental income per month, according to a survey by the California ADU Alliance.

a room that is being remodeled with the words i turned my garage into a 4x2 off tiny home for my parents
a room that is being remodeled with the words i turned my garage into a 4x2 off tiny home for my parents
How to Turn Your Garage into a ADU to Collect Rental Income
How to Turn Your Garage into a ADU to Collect Rental Income
How to Make a Crumbling Garage to Airy Living Space DIY
How to Make a Crumbling Garage to Airy Living Space DIY
20 Garage Guest Suite Ideas For The Perfect ADU Or In-Law Space
20 Garage Guest Suite Ideas For The Perfect ADU Or In-Law Space
Garage Conversion ADU Project - Santa Monica, CA
Garage Conversion ADU Project - Santa Monica, CA
a kitchen with two stools next to a counter top and an island in the middle
a kitchen with two stools next to a counter top and an island in the middle
ADU Garage Conversion Project Video
ADU Garage Conversion Project Video
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ADU Garage Conversion Cost Los Angeles
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Costs of Adding a Garage to House
20x20 Garage Conversion Plans | GatherADU
20x20 Garage Conversion Plans | GatherADU
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How I converted another garage to an ADU!
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Owner-Builder Garage Conversion ADU | Housable Case Study
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How We Converted Our Garage Into An ADU- Part 1 | New Generation Home Improvements
Garage Conversion Ideas for Your Space
Garage Conversion Ideas for Your Space
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Garage Conversion ADU Project - Manhattan Beach, CA
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Garage Conversion 101: How to Turn a Garage into Living Space - Maxable
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Mind-Blowing Garage Transformation: From Junk Storage to Modern Luxury Studio (Before & After)
an open kitchen and dining room with white walls, wood floors, and wooden furniture
an open kitchen and dining room with white walls, wood floors, and wooden furniture
33 Luxury $300K Garage Apartment Makeovers
33 Luxury $300K Garage Apartment Makeovers

Renting Out Your ADU

Renting out your ADU can help offset the cost of the conversion. Plus, it provides additional housing options in high-demand areas, contributing to your community's housing stock.

However, managing tenants requires time and effort. Ensure you understand your legal rights and responsibilities as a landlord. Consider hiring a property management company if managing tenants seems daunting.

Making Your ADU Energy Efficient

To minimize operating costs and environmental impact, consider making your ADU energy efficient. Options include installing energy-efficient appliances, LED lighting, and low-flush toilets. If your garage has a high ceiling, you might even consider adding renewable energy sources like solar panels.

In the end, whether converting a garage to an ADU is worth your time and money depends on your specific needs and circumstances. However, with proper planning and execution, an ADU can greatly enhance your living space, increase your home's value, and even generate rental income. So, don't let the project overwhelm you. Instead, research, plan, and take the first step towards your new space.