A garage extension is a great way to add space for work, hobbies, and storage. Learn how much a garage extension costs so you can budget accordingly.
Cost to Build a Garage in Seattle [2025 Data]
Normal Range: $19,032 - $39,099
The cost to build a garage in Seattle, Washington, is $26,198 on average but ranges between $19,032 and $39,099 depending on its size.
How we get this data
Patricia Marroquin / Moment / Getty Images
Patricia Marroquin / Moment / Getty Images
Cost Insights
A new garage can add valuable storage space for your Seattle home and protect your vehicles from the area’s varied weather conditions.
Brick or stick-built garages hold up well to Seattle’s wet weather and have a long lifespan.
A qualified Seattle garage builder will ensure your new garage is built well and up to code.
Some garages may qualify for a Subject-to-Field-Inspection permit, which has fewer plan requirements than a standard building permit.
A new garage can protect your vehicles from Seattle’s wet weather and increase your home’s value. Building a garage in Seattle costs $26,198 on average, but costs can range from $19,032 to $39,099. Several cost factors affect how much you’ll pay, which we break down so you can budget for this project.
Garage Building Cost Factors
One of the most common questions about building a garage for Seattle homeowners is how much it’ll cost. The cost to build a garage in Seattle, Washington, is based on several factors, including garage size, type, material, add-ons, and more. Take a look at some of the things that determine how much you’ll pay to build a garage.
Size
You'll pay about $45 per square foot on average between labor and materials when working with a professional. However, you'll find prices as low as $27 per square foot for simple, attached garages and up to $107 per square foot for detached, high-end garages with all the bells and whistles.
Below, we've listed the average cost to build a garage by size:
| Garage Size (Sq. Ft.) | Average Cost |
|---|---|
| 12x20 | $6,400–$25,625 |
| 18x20 | $9,600–$38,450 |
| 20x20 | $10,675–$42,725 |
| 20x22 | $11,750–$47,000 |
| 22x22 | $12,900–$51,700 |
| 32x22 | $18,775–$75,200 |
| 32x34 | $20,475–$82,050 |
Materials
A brick or stick-built garage will hold up well to Seattle’s wet weather, but these materials will have a higher initial cost than more budget-friendly options like metal, brick veneer, or a prefab pole barn garage.
| Garage Material | Average Cost (per Sq. Ft.) | Pros | Cons |
|---|---|---|---|
| Brick | $30–$45 | Extremely durable | High initial cost |
| Brick-veneered | $5–$30 | Brick look with lower cost | Susceptible to leaks |
| Cinderblock | $30–$65 | Fire resistant | Prone to cracking |
| Metal | $15–$35 | Resistant to pests, fire, and rot | Noisy during rain or hail |
| Stick-built | $40–$70 | Match home’s aesthetics | Higher cost |
| Prefab pole barn | $11–$40 | Fast installation | Less durable |
Type
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The type of garage you build will affect your budget—a one-car garage will cost less to build than a multi-car garage. Whether the garage is attached or detached makes a difference, too. A detached garage costs more because all four walls need to be constructed, while an attached garage builds off an existing exterior wall.
| Type of Garage | Cost to Build |
|---|---|
| One-car | $9,350–$24,025 |
| Two-car | $13,350–$35,600 |
| Three-car | $24,925–$50,725 |
| Attached | $9,600–$55,050 |
| Detached | $12,825–$67,700 |
Permits
A single-story garage less than 750 square feet and without a roof deck may qualify for a Subject-to-Field-Inspection (STFI) permit from the Seattle Department of Construction and Inspections. These permits have fewer plan requirements and a faster approval process than standard building permits.
Permit fees for projects valued between $25,000 and $50,000 cost $598 for the first $25,000 of value plus $1.30 for each additional $100 of value or fraction thereof. Projects that don’t qualify for STFI permits also require a plan review fee, based on the value of the project.
Accessibility
If you plan on making your garage more accessible, you may need to hire a local ramp installation pro to install a ramp over the concrete foundation. This may require extra landscaping renovations.
Add-Ons
Adding custom features to your new garage will increase the total project cost. Whether you choose a traditional garage door or a garage door alternative, plan to budget for the door and the cost to install a garage door opener. Adding flooring, security features, and storage will also affect the total project cost.
Insulating your garage will allow for more comfortable year-round use, but it has a high up-front cost. Adding living space to your garage can be a significant investment, but it pays off by adding valuable square footage to your home.
| Type of Add-On | Average Cost |
|---|---|
| Windows | $300–$2,500 |
| Automatic door | $750–$5,000 |
| Exterior door | $150–$1,400 |
| Insulation | $1,900–$7,700 |
| Flooring | $2–$12 per sq. ft. |
| Storage | $500–$2,200 |
| Security | $300–$2,000 |
| Living space | $125–$250 per sq. ft. |
Garage Builder Costs
Building a garage is a complex process you’ll want to leave to the pros. Hiring a garage builder in Seattle, Washington, will account for 50% to 70% of your total project cost and will ensure your garage is well built, up to code, and contains all the features you’re looking for.
Additional Pros to Consider Hiring
You may need to bring in some additional pros for specific projects during your garage build. If you need to hire a structural engineer to review your building plans, it’ll cost between $200 and $1,500. An electrician will cost $50 to $100 an hour to run wiring for outlets, lights, and an automatic door opener. Seattle’s wet weather may make a sump pump a good idea—a plumber will cost $50 to $200 per hour to install one.
Angi Tip
Installing a garage door without prior experience can be extremely challenging and potentially dangerous. It's highly recommended to contact a pro if you need a garage door installed.
Does Building a Garage Increase Home Value?
A garage adds value to your home, providing an impressive return on investment (ROI) of 60% to 85%. In Seattle, a garage with living space will offer the highest ROI, since it increases your home’s livable square footage and is desirable for potential homebuyers.
Even the cost to remodel your garage to include living space will pay off when it comes time to sell your home. A well-built garage, with or without living space, will allow you to set a higher asking price for your home and set it apart from similar properties.
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 survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from 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.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
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