How Much Does it Cost to Build a Detached Garage?

Detached garages in California often cost less to build than attached garages, especially when comparing similar sizes and features. In many cases, attached garages can add $10,000 to $15,000 or more to a project because of the added complexity involved with tying the new structure into the existing home and roofline.

At Golden State Buildings, we specialize in detached garages because they offer more flexibility. After building detached garages throughout California for years, we’ve found that they are often easier to plan and build around a homeowner’s specific needs.

In this guide, we’ll break down the average cost to build a detached garage in California, compare detached and attached garage pricing, and explain the key factors that can affect your final estimate.

Detached Garage Costs Based on Size

Garage size is often the biggest factor affecting the overall cost of a detached garage. Larger garages require more materials, labor, and site preparation, which can significantly impact the final estimate. Permit fees and local building requirements may also increase as garage size increases.

Here’s a quick breakdown of detached garage estimates* based on popular sizes:

Size	Average Cost
14×24	35-37k
16×24	36-38k
20×20	38-40k
20×24	43-45k
20×30	50-52k
22×24	45-47k
24×24	48-50k
24×30	56-58k
24×36	58-60k
26×30	62-64k
28×32	60-62k
30×30	60-62k
30×40	78-80k
32×40	78-80k
40×40	95-100k
40×60	120-125k

*Final costs may vary based on materials, customization options, permitting fees, site conditions, and other project factors.

How Much Does it Cost to Build a 20×20 Detached Garage?

A 20×20 detached garage in California typically costs between $38,000 and $40,000. Final pricing can vary based on local requirements, site conditions, and the features included in the project. Contact Golden State Buildings for a free estimate, and review our Central California garage permit guide for information on local permitting and building fees.

How Much Does a 20×30 Detached Garage Cost?

A 20×30 detached garage in California typically costs around $50,000 to $52,000. Customization options, permit fees, and project requirements can all affect the final cost. Golden State Buildings can help you plan your project and provide a free estimate based on your garage plans. You can also explore our Central California garage permit guide to learn more about local fees and requirements.

How Much Does it Cost to Build a 24×24 Detached Garage?

A 24×24 detached garage in California typically costs between $48,000 and $50,000. The final estimate will depend on factors like materials, upgrades, local permitting requirements, and site conditions. Contact Golden State Buildings for a free estimate, and check out our Central California garage permit guide for more information on local building fees and permitting requirements.

Detached Garage Costs Based on Materials/Features

The materials and features you choose can also significantly affect the final cost of your detached garage. While standard materials may help reduce upfront costs, upgrades like roofing, insulation, siding, and windows can improve durability, appearance, and long-term performance.

Here’s a general breakdown of common garage features, upgrades, and average price ranges:

Feature	Price Range	Most Popular Option	Cost
Foundation	Included	Concrete	Included
Siding	5-20k	LP Smart Panel	Depends on size
Roofing	5-20k	Lifetime Shingles	Depends on size
Insulation	2-10k	Fiberglass bats	Depends on size
Paint	3-10k	Exterior semi-gloss PPG	Depends on size
Doors	2-10k	Overhead doors	Depends on # of doors
Shelving	n/a	Usually, the customer takes care of it later	n/a
Venting	Included	Ridge vent, eave vents, & gable vents	Included
Windows	2-15k	White Vinyl Dual Pane	Depends on # of windows
Workbench	n/a	Usually, the customer takes care of it later	n/a

The best way to get accurate pricing is to discuss your garage plans, materials, and customization options directly with your builder. Local permitting requirements and site conditions in Central California can also affect the final estimate.

How Much Does it Cost to Build an Attached Garage?

While Golden State Buildings focuses on detached garages, attached garages typically cost $10,000 to $15,000 more than a detached garage with similar size and features. This added cost often comes from the additional planning and structural integration required to connect the garage to the home.

If you’re comparing both options, understanding the pros and cons of attached vs. detached garages can help you determine which layout best fits your property and budget.

Attached Garages vs. Detached Garages: Pros & Cons

In most cases, we recommend detached garages because they offer more flexibility in design, placement, and customization. Still, attached garages may make sense for certain properties or layouts.

Here’s a quick comparison between the two options:

Feature	Attached Garage	Detached Garage
Connected to Home	Yes	No
Average Cost	Typically higher	Often more flexible
Design Flexibility	More limited	Greater customization options
Placement Options	Limited by existing home	More flexible placement
Roofline Integration	Required	Not required
Workshop Potential	Moderate	Excellent
Noise Separation	Lower	Better separation
Ease of Access	Direct home access	Separate structure
Best For	Daily convenience	Flexibility and customization

Pros & Cons of a Detached Garage

At Golden State Buildings, we focus exclusively on detached garages because they offer more flexibility in design, placement, and customization. In many cases, detached garages are also easier to plan and build around a homeowner’s property and long term needs.

Detached garages can also work well for future ADU conversions in Central California, especially for homeowners who want more privacy, separation, or flexibility with how the space is used over time.

That said, detached garages are not the right fit for every project. Here are some of the biggest advantages and potential drawbacks to consider when comparing detached and attached garages.

Pros:

• More freedom with placement and orientation
• Easier customization for workshops or multi-use spaces
• Greater flexibility with garage size and layout
• Simpler construction process in many cases
• Better separation from noise, fumes, or workshop activity
• More privacy and independent access for future ADU conversions

Cons:

• Separate access from the home
• Additional trenching or utility work may be needed
• Longer walk during poor weather
• Placement can be limited on smaller lots

Pros & Cons of an Attached Garage 

Attached garages can make sense for certain homes and property layouts, especially for homeowners who prioritize direct access to the house. In Central California, attached garages may also be beneficial for future ADU conversions when homeowners want easier utility connections or a more integrated living space.

However, attached garages often require greater structural integration, additional permitting requirements, and less design flexibility.

Pros

• Easy access during poor weather
• Connected appearance with the existing home
• Convenient for daily parking and storage
• Utility connections may be simpler in some cases
• Can work well for connected or multigenerational ADU layouts

Cons:

• Higher construction costs
• More complex roofline integration
• Stricter permitting and code requirements
• Less flexibility for placement and layout
• Design restrictions based on the existing home

Get a Free Estimate for Your Detached Garage Project in California 

The best way to determine the cost to build a detached garage is to request a project-specific estimate. Golden State Buildings provides free estimates for detached garages throughout Central California, based on your preferred size, materials, features, and layout.

You can also review our Central California garage permit guide for local permitting contacts and project fee information. If you have questions about your project, our team is here to help you explore options that fit your property, storage needs, and budget.

If you have any questions, please don’t hesitate to contact us. We’d be happy to walk you through the specifics of your project or provide recommendations for your budget.