How Much Does It Cost to Build a Detached Garage? [2026 Data]

In 2026, the national average cost to build a detached garage is $26,400, with most homeowners spending between $19,200 and $33,600 depending on size, materials, and local labor rates. You should also budget for building permits ranging from $150 to $2,000, plus any electrical wiring or plumbing your project requires.

Detached Garage Cost Factors: What Determines the Price?

Several elements go into building a detached garage—all of which combine to make up the total cost. Below, we go over the most important detached garage cost factors.

Size

Your garage size is the single biggest cost factor when building a detached garage, with prices ranging from $40 to $70 per square foot. A compact 240-square-foot, one-car garage sits at the lower end of that range, while a 700-square-foot three-car garage pushes costs significantly higher. Garages designed as workspaces or warehouses can exceed even those figures, depending on the specialized features required. 

Here is how detached garage costs break down by size:

Exterior Material

The exterior materials you choose for your detached garage directly affect the total project cost, which ranges from $1 to $30 per square foot. This is one area where you may have real flexibility to control spending. Whether you need to match your home's existing siding will narrow your options and influence pricing. The overall cost of siding installation depends primarily on the size of the structure and the material selected. 

Here is how common siding types compare by cost per square foot:

Foundation

The foundation is a major cost component in the cost of building a garage, and a concrete slab costs anywhere from $4 to $8 per square foot. For a standard two-car detached garage, that translates to roughly $1,400 to $3,800, though the full range runs from $1,000 to $8,600 depending on the size of your garage.

Roof

The cost to install a roof on a detached garage runs between $6,000 to $13,000, including labor, with per-square-foot rates landing around $4 to $5 per square foot. Aluminum roofing sits at the low end of the cost spectrum, while slate shingles represent the most expensive option. 

Windows

The average cost to install windows in a detached garage ranges from $300 to $2,100 per window, with window size and frame material being the two biggest cost drivers. Small vinyl windows sit at the lower end of that range, while large or custom wood windows command the highest prices.

Type of Door(s)

The average garage door cost ranges from $750 to $1,700, driven by the door's size, style, and material. A single-car, standard panel steel door is the most affordable option, while a three-car, carriage-style faux wood door sits at the top of the range. Installing a glass garage door costs 200% to 300% more than standard garage doors, making it the premium choice for homeowners prioritizing aesthetics.

Labor

Hiring professionals to build your detached garage typically costs between $3,000 to $15,000, or roughly an additional 60% of your total materials cost. Prices vary by local market, so collecting quotes from multiple builders in your area is the best way to find competitive rates. How long it takes to build the garage also factors into the final labor bill, since more complex or time-intensive builds result in higher fees. 

Location

Where you build your detached garage directly influences your total project cost. A site located far from existing plumbing and electrical lines increases installation costs, while an accessible location close to those utilities simplifies the work and keeps labor costs lower. Before finalizing your build site, confirm its proximity to your home's utility connections to avoid unexpected expenses.

Detached Garage Add-On Costs: What to Budget For

Beyond the core build costs, plumbing, wiring, insulation, and painting are common add-ons that can meaningfully increase your total detached garage budget. Planning for these expenses upfront helps you avoid surprises once construction is underway.

Plumbing

Installing plumbing in a detached garage costs anywhere from $600 to $1,600 per fixture, making it one of the more significant add-on expenses to plan for. Plumbers cost between $45 to $200 per hour, depending on your local cost of living. The type, quality, and materials of each fixture also affect the final price. Here is a breakdown of common fixture installation costs on top of the plumbing line work:

• Toilet installation cost: $225–$525

• Sink installation cost: $225–$650

• Shower installation cost: $4,450–$16,925

• Bathtub installation cost: $1,975–$9,350

Wiring

The average cost to run electricity to a detached garage falls between $1,000 to $3,800, though complex jobs involving long-distance wiring runs, amperage upgrades, or drywall removal can push costs upward of $5,000. Single-wire transmission is the most affordable configuration, while multi-wire transmission sits at the top of the price range.

Insulation

Insulating a garage costs anywhere from $0.30 to $6.75 per square foot, and because every wall of a detached garage requires insulation, the total cost runs higher than it would for an attached garage. If your plans for how to build your garage include garage ceiling insulation, budget an additional $1 to $4 per inch of board foot. Depending on the type of insulation you choose, drywall may be required over it, and drywalling costs an average of $360 to $1,700.

Painting

Painting the interior of your detached garage costs around $2.75 per square foot, while exterior paint costs run slightly higher at $1.50 to $4 per square foot. Paint quality plays a significant role in the total cost, since best paint brands often provide better coverage in just two coats, while lower-quality options may require a third coat to achieve the same result.

Tips to Save Money

Building a detached garage is a major investment. As such, finding ways to save on a detached garage project can help offset some of the financial costs that come with such an investment. Here are some tips on how to save on the cost of your detached garage:

• Choose smaller square footage for your design. 

• Pick a building site close to plumbing and electricity. 

• Invest in low-cost roofing and doors. 

• Install fewer windows. 

• DIY simpler parts of your detached garage project. For example, painting your garage yourself can save you between $1 to $3.50 per square foot.

• Get at least three price estimates before deciding who to hire to build your garage. 

Do I Need a Permit to Build a Detached Garage?

Construction permit costs generally range from $150 to $2,000, varying by city and the specific type of permit required. You will almost certainly need a permit to build a detached garage, as most cities require one for any permanent structure added to a property. Contact your local building department early in the planning process to confirm the exact requirements and fees for your area.

Cost to Build a Detached Garage vs. Attached Garage

Building a detached garage versus an attached garage typically costs 10% to 15% more, primarily because detached builds require additional materials and more labor. Adding plumbing and electrical wiring widens that gap further. The farther your detached garage sits from your home, the greater the price disparity becomes.

Detached Garage Pro Costs: What to Expect

Hiring a local garage builder costs 60% more than a DIY approach, with professional builds ranging from $8,000 to $40,000 depending on the size and scope of work. Going the DIY route can save you $3,000 to $15,000, but inexperience with structural builds can lead to mistakes, safety hazards, and code violations that cost more to fix than the original savings. Working with a licensed pro ensures your detached garage is structurally sound and built to local code from the start.

Here’s why it’s ideal to hire a garage building pro

Building a detached garage isn’t a simple DIY job. Here’s why it’s best to hire an experienced builder for your project:

• Hiring a pro ensures your garage meets local building codes and zoning regulations.

• Professionals know how to prevent foundation issues, structural problems, and electrical concerns.

• DIY builds can lead to costly damage, leaks, and improper door alignment.

• Experienced pros know how to handle wiring, insulation, and plumbing safely.

• Professionally built detached garages are durable, functional, and can increase your property's value.

If you want to DIY a detached garage

To assist your pro with the build, focus on smaller tasks like:

• Clearing trees, shrubs, and outdoor furniture from the work area

• Prepping the ground with professional guidance

• Keeping materials and equipment organized and easily accessible

• Installing small fixtures or hardware after construction is complete

• Bringing in tools, storage, and belongings to the garage once the job is done

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We extensively research project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We rely on reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

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