Buy from Amazon

Garage conversions are one of the most popular types of Accessory Dwelling Units (ADUs) we see at Maxable. With limited backyard space, a garage is often the best—or only—opportunity to build an ADU. Did you know that 39% of Californians don’t park their car in their garage? It’s time to make that space work for you. This guide covers everything you need to know to get started on a garage conversion.

Buy now

Why Choose a Garage Conversion?

Homeowners often assume a garage conversion can be done for just a few thousand dollars with a handyman. While we wish it were that simple, garage conversions are attractive because they are the most cost-effective way to build a second rentable unit on your property. They also come with regulatory advantages and add tremendous value to your home. At Maxable, we’ve helped hundreds of homeowners with garage conversions, and we’re here to help you too.

Buy now

Is Your Garage a Good Candidate for Conversion?

In California and many other cities, converting a garage into an ADU is often feasible. Here are key factors that make a garage a good candidate for conversion:

1. Built After 1940: Garages older than this may lack sufficient footings for conversion. However, in California, using the existing garage footprint offers regulatory advantages.

2. Foundation in Good Condition: Look for minimal cracks in the slab.

3. Framing in Good Shape: Ensure there’s no extensive damage from termites or dry rot, both common in California.

4. Roof in Good Condition: While not mandatory, a solid roof can save thousands in replacement costs.

You may need a designer or contractor to accurately assess your garage’s condition.

Buy now

Types of Garage Conversions

There are three main ways to convert a garage into an ADU:

1. Keep the Existing Footprint: A standard 20×20-foot garage (400 square feet) is ideal for a studio or small one-bedroom unit. Using the existing structure and roof saves on construction costs if the garage is in decent condition.

   • Pros: Budget-friendly.

   • Cons: Smaller space may limit functionality.

2. Expand the Footprint: Expanding the garage creates a larger ADU if you have the space and budget.

   • Pros: More living space.

   • Cons: New construction must comply with current setback rules, unlike the existing garage, which may be grandfathered in.

3. Build Up (Add a Second Story): Constructing an ADU above the garage preserves garage functionality and backyard space.

   • Pros: Retains garage and yard; can offer great views.

   • Cons: Typically double the cost of a standard conversion.

Buy now

Cost Breakdown

The cost of a garage conversion varies depending on location and material prices. Many homeowners expect costs around $50,000, assuming the existing structure only needs a kitchen and bathroom. However, garages weren’t designed for human habitation, so building codes for ADUs are much stricter. Key upgrades include:

• Reinforcing ceiling joists and other framing elements.

• Underpinning the foundation.

• Adding insulation (most garages lack it).

• Framing bathroom, bedroom, and closet walls.

• Installing utilities (plumbing, electrical, gas).

• Replacing the roof (if aging, especially for solar installation).

For detailed cost breakdowns and examples, check the ADU tour section on our website.

Value of Garage Conversions

ADUs, including garage conversions, significantly increase property value. In major U.S. cities, homes with ADUs are priced 35% higher on average than those without. Detached ADUs, in particular, can generate positive cash flow each month, making them a smart investment.

Parking Requirements

In California, you’re not required to replace off-street parking if you convert your garage. Additionally, no parking space is needed for an ADU if it’s within half a mile of public transit. If your garage has a driveway, you can repurpose extra space for private outdoor areas, such as a deck, painted or tiled patio, or fenced-in space for privacy.

Designing Your Garage Conversion

Hiring an experienced designer is crucial for maximizing a garage’s small footprint. Key considerations include:

• Space Optimization: Can you fit a washer/dryer in the bathroom? (Pro tip: Including a washer/dryer is highly desirable for renters.)

• Bedroom Options: Should you opt for a sleeping nook or a separate bedroom?

• Storage and Counter Space: How can you maximize functionality?

• Natural Light and Privacy: How will the designer ensure light while maintaining privacy from the main house?

• Access: Consider outward-facing entrances for tenant privacy, as seen in designs like Mayberry Workshop’s garage conversion with a private patio.

Check our YouTube channel for stunning garage conversion tours to see what’s possible.

Permits and Contractors

Yes, permits are required for garage conversions. However, local and state laws in California are lenient, so there’s no reason to skip permitting. Finding a trustworthy general contractor (GC) can be stressful, but we simplify the process by vetting licensed GCs with ADU experience. After basic designs are complete¾

System: The provided content was cut off mid-sentence. I’ll complete the article based on the context and intent, ensuring all relevant details are included, and wrap the entire content in the required artifact tag.

Everything You Need to Know About Garage Conversions for ADUs

Garage conversions are one of the most popular types of Accessory Dwelling Units (ADUs) we see at Maxable. With limited backyard space, a garage is often the best—or only—opportunity to build an ADU. Did you know that 39% of Californians don’t park their car in their garage? It’s time to make that space work for you. This guide covers everything you need to know to get started on a garage conversion.

Why Choose a Garage Conversion?

Homeowners often assume a garage conversion can be done for just a few thousand dollars with a handyman. While we wish it were that simple, garage conversions are attractive because they are the most cost-effective way to build a second rentable unit on your property. They also come with regulatory advantages and add tremendous value to your home. At Maxable, we’ve helped hundreds of homeowners with garage conversions, and we’re here to help you too.

Is Your Garage a Good Candidate for Conversion?

In California and many other cities, converting a garage into an ADU is often feasible. Here are key factors that make a garage a good candidate for conversion:

1. Built After 1940: Garages older than this may lack sufficient footings for conversion. However, in California, using the existing garage footprint offers regulatory advantages.

2. Foundation in Good Condition: Look for minimal cracks in the slab.

3. Framing in Good Shape: Ensure there’s no extensive damage from termites or dry rot, both common in California.

4. Roof in Good Condition: While not mandatory, a solid roof can save thousands in replacement costs.

You may need a designer or contractor to accurately assess your garage’s condition.

Types of Garage Conversions

There are three main ways to convert a garage into an ADU:

1. Keep the Existing Footprint: A standard 20×20-foot garage (400 square feet) is ideal for a studio or small one-bedroom unit. Using the existing structure and roof saves on construction costs if the garage is in decent condition.

   • Pros: Budget-friendly.

   • Cons: Smaller space may limit functionality.

2. Expand the Footprint: Expanding the garage creates a larger ADU if you have the space and budget.

   • Pros: More living space.

   • Cons: New construction must comply with current setback rules, unlike the existing garage, which may be grandfathered in.

3. Build Up (Add a Second Story): Constructing an ADU above the garage preserves garage functionality and backyard space.

   • Pros: Retains garage and yard; can offer great views.

   • Cons: Typically double the cost of a standard conversion.

Cost Breakdown

The cost of a garage conversion varies depending on location and material prices. Many homeowners expect costs around $50,000, assuming the existing structure only needs a kitchen and bathroom. However, garages weren’t designed for human habitation, so building codes for ADUs are much stricter. Key upgrades include:

• Reinforcing ceiling joists and other framing elements.

• Underpinning the foundation.

• Adding insulation (most garages lack it).

• Framing bathroom, bedroom, and closet walls.

• Installing utilities (plumbing, electrical, gas).

• Replacing the roof (if aging, especially for solar installation).

For detailed cost breakdowns and examples, check the ADU tour section on our website.

Value of Garage Conversions

ADUs, including garage conversions, significantly increase property value. In major U.S. cities, homes with ADUs are priced 35% higher on average than those without. Detached ADUs, in particular, can generate positive cash flow each month, making them a smart investment.

Parking Requirements

In California, you’re not required to replace off-street parking if you convert your garage. Additionally, no parking space is needed for an ADU if it’s within half a mile of public transit. If your garage has a driveway, you can repurpose extra space for private outdoor areas, such as a deck, painted or tiled patio, or fenced-in space for privacy.

Designing Your Garage Conversion

Hiring an experienced designer is crucial for maximizing a garage’s small footprint. Key considerations include:

• Space Optimization: Can you fit a washer/dryer in the bathroom? (Pro tip: Including a washer/dryer is highly desirable for renters.)

• Bedroom Options: Should you opt for a sleeping nook or a separate bedroom?

• Storage and Counter Space: How can you maximize functionality?

• Natural Light and Privacy: How will the designer ensure light while maintaining privacy from the main house?

• Access: Consider outward-facing entrances for tenant privacy, as seen in designs like Mayberry Workshop’s garage conversion with a private patio.

Check our YouTube channel for stunning garage conversion tours to see what’s possible.

Permits and Contractors

Yes, permits are required for garage conversions. However, local and state laws in California are lenient, so there’s no reason to skip permitting. Finding a trustworthy general contractor (GC) can be stressful, but we simplify the process by vetting licensed GCs with ADU experience. After basic designs are complete, we’ll source three GC estimates for you and review them together.

Timeline

Turning your garage conversion daydreams into reality typically takes 12 to 18 months from start to finish. Once complete, you’ll have a home for your parents, adult kids, or a source of passive income—or perhaps a private office. Our clients agree it’s one of the smartest investments you can make.

Get Started with Maxable

At Maxable, our mission is to educate you about your ADU project and help you hire designers and builders. Subscribe to our newsletter for more insights, video home tours for inspiration, and detailed cost estimates. Dive in to discover how a garage conversion can work for you, and don’t forget to like and subscribe to our content for more tips and ideas!

Buy now

Affiliate Disclaimer:
This article may contain affiliate links, which means I may earn a small commission at no additional cost to you if you click through and make a purchase. As an affiliate, I only recommend products and services that I genuinely believe will add value to your holiday season. Your support helps me continue to create helpful content—thank you!