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Build a Detached Garage Cost

Build a Detached Garage Cost

National average
(two-car, single story, finished interior, 576 square foot, asphalt shingles, vinyl siding)
Low: $25,215

(one-car, single story, 240 square foot, asphalt shingles, vinyl siding)

High: $110,000

(two-car, 720 square foot, finished interior, second story loft, metal roofing, brick siding)

Cost to build a detached garage varies greatly by region (and even by zip code).
Get free estimates from garage, shed and enclosure contractors in your city.

The average cost of building a detached garage is $52,830.

In this guide

Pros and Cons
Siding and Roofing
Floors and Walls
Two-story Detached Garage
Garage Doors
Windows, Skylights and Garage Doors
Electrical Wiring and Lighting
Enhancement and Improvement Costs

How Much Does It Cost to Build a Detached Garage?

If your home does not currently have a garage, you may want to add one to your property for several reasons. Not only does a garage protect your car from the elements, but it can also provide extra storage space and workspace for everything from car repairs to woodworking projects. While there are benefits to both attached and detached garages, many people choose a detached garage to keep carbon monoxide fumes away from the home, or because attaching a garage to the existing structure would not work due to obstructions, or for structural and aesthetic reasons.

The cost of building a detached garage can vary considerably by location, size, materials, and finishes chosen. Typically, it averages $30,000 - $60,000, with the average customer paying $52,830 for building a two-car design (24’x24’) with a finished interior and vinyl 1 siding averages $52,830 in the United States.

Build a detached garage cost

Build a detached garage cost

Detached Garage Costs

Build a detached garage costs
National average cost$52,830
Average range$30,000 - $60,000
Minimum cost$25,215
Maximum cost$110,000


One of the first and most important considerations that you must factor into building a detached garage is the location on your property. A land survey is required before any work can commence. Once the survey is complete, giving the contractor a better understanding of the site, work can begin.

Excavation and site preparation costs can increase with many factors. This site preparation may include tree and brush removal, previous structure removal, excavation, erosion control, re-sloping, leveling 2, and dirt replacement.

Pros and Cons

As with any home improvement project, there are pros and cons to building a detached garage. The decision will depend on what your goals and needs are regarding extra space, the limitations of the existing property, and of course finances.


Keep family safe from carbon monoxide fumes

More freedom in the design

Adds extra storage or workshop space

Offers more privacy if you have living space included in your plans

Construction of detached garage is from scratch and more expensive

You will still need to venture into inclement weather to reach your car

You may need to install a driveway or redesign your current one


Possibly, the most critical decision to be made regarding building a detached garage is the foundation style. Depending on where you live, you may have a few options that are on the less expensive end of the spectrum. For obvious reasons, warm climates that rarely experience freezing temperatures allow for foundations that are simpler in design and, therefore, less expensive. On the other end of the spectrum, if you live in an area like New England, where foundations are exposed to high humidity and vastly changing temperatures, you will require greater depth and a more complex design.

If you are building a small, simple single-car garage in an area of the country that experiences year-round moderate temperatures and low relative humidity, you might consider a gravel pad, the least expensive foundation option. While this is maybe the most cost-effective option ($5 per square foot), it is rarely the most substantial or long-lasting option. The most durable foundation for your garage will always be concrete. Four options of concrete foundations include floating pads($6 to $8 per square foot), the simplest and least expensive, floating foundations ($7 to $14 per square foot), offering superior moisture protection, monolithic foundations ($14 to $17 per square foot), best in areas with the coldest winters, and block foundations ($14 to $17 per square foot), delivering ideal protection from both frost and moisture.

Siding and Roofing

If the goal is a single-car garage to be used for a car and perhaps a little extra storage, basic asphalt 3 shingles, and low-cost vinyl siding can do the trick. Both asphalt shingles and vinyl siding can affordably cost as little as $3 to $4 per square foot. Now, if you desire higher form and function in siding and roofing, you have many options, but the cost increase can be significant.

Ideally, roofing on your detached garage will match or complement the other structures on your property. Durability and maintenance demand also ample consideration. Asphalt shingles 4 ($2.1 per square foot) are the most common roofing material. Beyond asphalt shingles, there are plenty of roofing options for a detached garage project. Corrugated metal roofing is an attractive option with a shorter installation time and costs ranging from $4 to $8 per square foot. Also, standing seam metal roofing ($15 per square foot) is another fantastic aesthetic choice with all hidden fasteners 5 and delivers next-level durability and longevity. For a more traditional look, the ideal option would be modified bitumen ($3 per square foot).  However, if you are looking for a long-lasting roof, consider TPO ($4.5 per square foot), which can last up to 40 years, or clay ($3 per square foot), which can last several generations, up to 100 years.

As with your roofing choices, siding decisions should focus on durability as much as, if not more than, budget and aesthetics. These are some of the most common options:

  • Aluminum ($4.20 per square foot). Non-corrosive, susceptible to fading and denting, it can last over 40 years.
  • Steel ($4.50 per square foot). Non-corrosive, susceptible to fading and denting, over 40 years of lifespan.
  • Vinyl ($5 per square foot). Retains color, susceptible to cracks, it lasts up to 20 years.
  • Fiber cement($6 per square foot). Durability of 25- 40 years.
  • Wood ($8.50 per square foot). With regular maintenance, it can last 15-40 years or more.
  • Masonry, stone or brick ($13 per square foot). Quite durable, 50 year lifespan.
  • Stucco ($11.50 per square foot). Low maintenance, it lasts up to 40 years.

Floors and Walls

One of the great things about a detached garage project is that you can live without finished walls and flooring. If you are not going to be spending a lot of time in the garage, or you haven’t made up your mind about what other purpose the space will serve, you can leave the exterior walls as they are and simply seal the concrete foundation floor. But, if you want a more finished space, mid-grade insulation ($0.27-$0.34 per sq.ft.) and drywall ($1-$3 per sq.ft.) installation is relatively quick and affordable. Concrete floor coating, ideal for work spaces, will cost on average $3 per square foot. Although if you want to get really creative and go for something stylish, like a polymer modified overlay with elaborate designs, it could cost as much as $15 per square foot.


Primarily, the dimensions of your detached garage will hinge on your needs and the available space on your property. The minimum recommended size for a one-car garage is 12’x22’, for a two-car is 20’x20’, and for three-cars it’s 32’x22’. These minimum sizes are ideal if you want to store your vehicles, but not much else. Typically, detached garage project sizes are customized to include more than just car storage.

For just the basic, unfinished 12’x22’ one-car garage, consumers in the U.S. expect to spend approximately $27,000 to $30,000. A similar 20’x20’ two-car garage will average $33,000 to $35,000 and a 32’x22’ foot, no-frills three-car garage will average $45,000 to $47,000. Of course, these are low-end prices, and the cost will increase with interior finishes and customization.

Two-story Detached Garage

Looking to add a significant amount of living or storage space to your property? Perhaps, you may want to consider adding a second story to your detached garage. A second story on your garage offers endless possibilities, from seasonal storage to an entire apartment. Unsurprisingly, the cost difference is substantial. On average, a two-story unfinished two-car garage primarily used for storage will average $63,000. Contrarily, a finished and insulated two-story three-car garage with full living space above will average $136,000. It should be noted that these average costs are a sampling from various parts of the country and are based on the use of lower- to mid-range siding, roofing, and finishes.


For easy access to your home and new detached garage, it may be necessary to extend the existing driveway or install a brand new one. An average 12’x50’ asphalt paved driveway will cost approximately $830. Another similarly affordable option for driveways, around $800, is the less durable gravel, but you may prefer the look of something more decorative like brick pavers, with averages $11,630, or stamped concrete, averaging $7,200.

Garage Doors

The average size of a garage door is 9’x7’. Double-width doors are available if you would like a single door for a two-car garage, but additional structural support will be a necessary added expense. As with most components in the garage, you will find an extraordinary number of options in materials, colors, and styles of garage doors. Since the garage door may be the first thing that people see as they approach your property, and curb appeal is so important, aesthetics is undoubtedly a significant influence on the decision. Also, durability, ease of function, energy efficiency, and longevity should factor into choosing the right garage door. On average, a garage door costs between $500 and $1,100, although the price will increase with options such as insulation, windows, automatic openers, and other custom features.

Garage doors are available in a variety of materials, all with specific benefits and are more suited to certain environments. Vinyl ($400-$700) and aluminum doors ($800-$1,300) are lightweight and generally less expensive. Fiberglass 6 ($1,150-$2,050) and steel ($1,500-$2,000) deliver on durability, while wood doors ($1,300-$2,500) open up your project to touches of personal style and creativity.

Windows, Skylights and Garage Doors

Windows, skylights, and pedestrian doors are optional additions that might be considered when designing a detached garage. Ease of access through a pedestrian door, typically 32”wide x 78” high, is appealing to some homeowners, as is the additional natural light allowed with a windowed door. Of course, if your new garage space is to include working or living areas, a pedestrian door may even be required by your homeowner's insurance and local building codes. More often than not, steel exterior pedestrian doors ($500 to $700) are chosen for their durability, security, and energy efficiency.

Windows, while not required, are desirable for maximizing natural light. With customization, and room in the budget, windows for your detached garage ($1,480) can come in a seemingly endless array of options. However, the most common sizes that you will see are 18”x36”, 24”x36”, and 30”x36”.

Similarly, skylights ($450 to $1,500) offer intense natural light and energy-efficient heat in the colder months. Unfortunately, skylights are notoriously high-maintenance, leak-prone, and require repairs every few years.

Electrical Wiring and Lighting

Decisions about electrical and lighting will depend entirely on what the detached garage will be and the purposes that it will serve. If it is merely going to be a spot to protect your car from the elements, then necessary wiring for a single overhead light, or perhaps, electric to an automatic door opener will suffice. Otherwise, consulting an electrician about any of a myriad of possibilities is advisable. Electricians usually charge between $65 to $85. Surely, if living or workspace is considered, then lighting and electrical will be more extensive, especially when considering HVAC.


A contractor will be able to discuss your plans with you, then hire and schedule the appropriate specialists to perform the jobs that need to get done. What state you live in will impact how much this will cost. Also, there are a number of variables that will ultimately define your labor costs overall. For example, the average per-hour fee for an electrician in the U.S. can range from $65 to $85. Additionally, electricians may charge for square footage for more complex wiring needs. Similarly, siding professionals tend to charge by the square foot, and their average hourly rate, $40 to $50 per hour, will be included in that square foot price, and roofing labor tends to also charge by the square foot at roughly $3 per square foot. If you choose high end finishes, or things like custom brick work, slate 7 roofing, or complex HVAC, it will be reflected in the cost of labor that each professional will charge, which will affect the general labor cost as well.

Enhancement and Improvement Costs


Whether you want to incur the expense of insulating your garage will depend on how you plan to use the space and the climate of your location. If you are building a detached garage just for car storage in Florida, insulating may not be a concern. However, if you are building a detached garage in Maine and want to use it as a woodworking shop, insulation is definitely desirable. With an average cost of $1,500 to $2,000 for insulation, you will have to decide if it is necessary for your particular needs.


Gutters may not seem like a necessity for a garage, especially if it is only to be used for basic storage and a vehicle. Although at an average cost of $4 - $9 per linear foot you may consider this as a necessary expense. Gutters will keep rainwater away from your structure, prevent rotting and water damage, and save money on maintenance and repairs in the long run.


As with many of the options as mentioned above, HVAC ($2,500) will be a personal choice based on the purpose of your detached garage and your location. In some areas of the country, a garage with a second story that will be used as a living space would require HVAC, particularly where freezing pipes or humidity damage could be an issue.

Stone Veneer

For those that would like to add a decorative touch to your detached garage, adding stone veneer to the front siding of your garage is the perfect option. Stone veneer is significantly less expensive than other material options ($6 - $9 per square foot), and it can really enhance the appearance of your garage.

Additional Considerations and Costs

  • Permits. Many of the jobs needed to build a detached garage would require the work of licensed professionals. Permit costs for new construction vary from county to county and state to state. The average cost for permits is figured by a square foot cost, roughly $0.79 per square foot. Therefore, the average cost of a building permit for a new 576 square foot detached garage would be about $455. Additionally, your town may require a planning permit (average $30) prior to receiving a building permit.
  • Inspections. An inspection post construction to ensure that the building meets all local and state building codes, particularly structural and electrical, are vast and detailed. For your detached garage to pass the final inspection it is necessary to have someone familiar with the code books doing the work for you.
  • DIY. While some of the finish work could be considered DIY, it is advisable to hire a contractor to handle the bulk of garage construction. Pulling permits for the job, hiring licensed subcontractors, planning, scheduling, and handling inspections are just a few reasons to leave this job to a pro.
  • Further additions. The planned use of your detached garage will dictate even more considerations, such as plumbing, architectural and interior design costs, decor, and furnishings.
  • Replicating looks. If you already have tile or slate shingles on the other structures on your property, you may consider replicating the look on your new garage. However, these labor-intensive choices will cost more than $15 per square foot.
  • Roof trussing 8 costs. These will depend on personal aesthetic and function choices. For instance, roof truss pitches allowing room for a subfloor 9, storage attic, or living space (which would also include 2nd story floor joists) all add to the cost of your framing.


  • How much does it cost to build a detached garage?

Typically, a single-car garage, 240 square foot, with few bells and whistles, averages $25,215.

  • How much does it cost to build a 24’x24’ garage?

A two-car enhanced design 24’x24’ will average $52,830.

  • How much does it cost to build a 30’x40’ garage?

A 30’x40’ detached garage, depending on enhancements, will average $54,000.

  • How much does it cost to build a 30’x30’ garage?

A 30’x30’ garage can cost as little as $40,000 on average, without high end finishing.

  • What is the average cost to build a detached 2 car garage?

The average cost to build a finished, detached two-car garage is $52,830.

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Remodeling Terms Cheat Sheet

Definitions in laymen's terms, cost considerations, pictures and things you need to know.
See full cheat sheet.
glossary term picture Vinyl 1 Vinyl: A synthetic plastic made from ethylene and chlorine. Vinyl has many applications in the construction industry and it is widely used in sidings, window frames, roofing and gutters, among others
2 Leveling: The process of evening out the ground's surface, making it either flat or sloped.
glossary term picture Bitumen 3 Asphalt: A viscous, black mixture of hydrocarbons often used for roofing and waterproofing. It is also used in asphalt for paving roads
glossary term picture Shingle 4 Shingles: A smooth, uniform, flat piece of construction material, available in a wide variety of materials and laid in a series of overlapping rows, used to cover the outside of roofs or walls to protect against weather damage and leaks.
5 Fasteners: Hardware used to attach two or more objects to each other. A common example is a nail
glossary term picture Fiberglass 6 Fiberglass: Plastic that is reinforced with glass fibers. The fibers may be mixed randomly throughout the plastic, or come in the form of a flat sheet, or be woven into a fabric
glossary term picture Slate 7 Slate: A fine-grained rock, typically bluish-gray in color, that can easily be split into thin layers and is commonly used as a roofing material
glossary term picture Truss 8 Trussing: Structural framework used to support a roof
glossary term picture Subfloor 9 Subfloor: The bottom-most layer of a floor, supported by joists, over which finished flooring material is laid

Cost to build a detached garage varies greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.

Detached white garage with orange tile roof

Labor cost by city and zip code

Compared to national average
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Ashland, NH
Athens, GA
Atlanta, GA
Austin, TX
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Bradenton, FL
Brookfield, WI
Buffalo, NY
Charlotte, NC
Chesterfield, VA
Chicago, IL
Cincinnati, OH
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Colorado Springs, CO
Columbus, OH
Dallas, TX
Dayton, OH
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Fayetteville, NC
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Houston, TX
Huntsville, AL
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Miami, FL
Milwaukee, WI
Nashville, TN
Omaha, NE
Pensacola, FL
Phoenix, AZ
Portland, OR
Rapid City, SD
Reno, NV
Richmond, VA
Rougemont, NC
Sacramento, CA
Saint Louis, MO
Saint Paul, MN
Saint Petersburg, FL
Salt Lake City, UT
San Francisco, CA
Seattle, WA
Smyrna, GA
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