Cost to build a 3 car detached garage

If you’re planning on building a new garage, you need to know how much it’ll cost. Even though your project might be very complex, and will require some professional skills as well as high-end materials, it’s possible to do it for almost any budget. That’s why we’ve prepared for you this guide that focuses on the main things to look at when estimating the cost of your detached garage build. Let’s go through those main things one by one, and then I’ll offer you some examples of costs written from my own experience.

Cost to build a 3 car detached garage

The national average cost to build a garage is $24,000. Garage costs depend on its siding material, foundation and finishes, like electricity and garage door style. A single-car, detached garage kit starts at around $7,250 while an attached three-car garage with a loft can cost $50,000.

Average Cost to Build a Garage

Average Cost$52
Highest Cost$70
Lowest Cost$35
*Costs per square foot

Garage Cost Per Square Foot

A two-car garage costs an average of $52 per square feet to build. Custom garage construction costs, like a slab foundation, security system, and livable loft space, mean you could pay between $35 and $90 per square foot.

Single-Car Garage Cost

Single-car garages come in a lot of different shapes and sizes each with their own price tag. Choose a slightly larger footprint for additional storage space.

12 by 24 feet$15,000
14 by 28 feet$20,400
*Costs calculated using $52 per square foot average and rounded to the nearest $100

2-Car Garage Cost

One of the largest cost factors for multi-car garages is the number of garage doors you need to install. Depending on your lot size and how you plan to access your cars, you can choose to park side-by-side or front-to-back, also called tandem.

24 by 24 feet$30,000
24 by 30 feet (tandem)$31,200
*Costs calculated using $52 per square foot average and rounded to the nearest $100

3-Car Garage Cost

Garages that accommodate three or more cars cost the most because they require the most square footage. They are great for families with multiple vehicles ranging from economical cars to recreational vehicles.

36 by 24 feet$44,900
30 by 40 feet$62,000
*Costs calculated using $52 per square foot average and rounded to the nearest $100

Detached Garage Cost

Detached garages range in price from $1,500 for a no-frills stainless steel kit that fits one car to $50,000 for a barn-like custom garage that fits three cars and an in-law suite. How much you pay depends on the size, functionality, materials and labor. Budget for the cost of a foundation as well as the cost of a driveway to your new garage.

Stainless steel garage kits with manual garage doors and no insulation are the most affordable and fastest to build. You can find these at outbuilding and shed retailers near you. On the other hand, detached garages with siding, trim and roofing that match your home will cost more.

Hire an electrician if you’re adding or updating electrical to your detached garage to accommodate automatic garage door openers, lighting or a security system. Hire a plumber to install wet features like a drain, hose or work-station sink.

Attached Garage Cost

Attaching a garage to your home costs an average of $26,000. However, you could pay anything from $10,000 to $43,000 depending on how many cars you’d like to accommodate and whether it includes livable space.

It costs less to run new electrical or plumbing to an attached garage, especially where those features connect with existing lines. For instance, if you want a garage with an apartment, choose a floor plan that allows new wet rooms to share walls with your existing laundry or bathroom.

You may also need to replace the door connecting your home to the garage with one that is fire-rated. Check local housing codes or talk to your garage contractor.

Garage Material Costs

To build a garage, you’ll need to start with the foundation. Budget for the cost of a concrete slab foundation, which averages $4 to $8 per square foot. Measure the length and width of your new garage foundation to create a rough project budget with the following costs per square foot:

Foundation Cost$4 – $8
Framing Cost$5 – $13
Siding Cost$2 – $50
Roofing Cost$1 – $10

Don’t forget to coordinate concrete installation with any plumbing, drainage or HVAC system needs. Hire a general contractor to complete your project successfully and on budget.

On top of the foundation you’ll either need a prefabricated garage kit or a custom wood frame to erect the walls and roof. From there, it’s time to install the garage door and any exterior doors and windows. Take a look at the following per-unit costs, including materials and labor, and add them to your project budget:

Garage Door$600 – $1,500
Exterior Door$450 – $700
Exterior Windows$100 – $700

If you opt for a finished garage, you’ll also need electrical to install a garage door opener, lighting and electric vehicle charging stations. Once optional plumbing and electrical are installed, it’s time for insulation, drywall, painting and features such as storage solutions.

Garage Door Opener$200 – $525
Lighting$80 – $900
Storage Solutions$500 – $10,000
Electric Vehicle Charging Station$1,000 – $2,300

Factors That Affect the Cost of Building a Garage

Several factors will affect the final cost of building a garage, from the size of your garage to labor costs to insulation and much more. To budget accurately for such a large home improvement project, it is essential to understand each factor’s cost.

Size of Garage

The cost of building a custom garage is typically determined by square footage. Most contractors charge approximately $35 to $70 per square foot for a standard garage. For instance, a single-car attached garage at approximately 240 to 380 square feet can range from $10,500 to $20,400. A double-car garage at approximately 440 to 620 square feet can range from $20,000 to $40,300. A three-car garage at approximately 620 to 820 square feet can range from $30,000 to $45,000.


Building a custom garage is a large home improvement project, and it can take multiple laborers to complete the project. Therefore, labor rates will comprise roughly 50% to 70% of the overall bill. The more you DIY, the more you can reduce labor costs.


For those who plan to utilize a garage beyond just parking a car, consider insulating it. Whether using it as a workspace or storing temperature-sensitive items, insulating your garage will help reduce rapid temperature swings. 

The insulation cost typically depends on the insulation type you choose. For instance, blown-in insulation ranges from $.5 to $1.5 per square foot. Batting insulation ranges from $1 to $2 per square foot. Spray-in insulation ranges from $1.5 to $4 per square foot.


Whether you are building a garage to park your car, store your belongings or both, it may be wise to install security features to ensure your item’s safety. Security features such as a garage security system can cost anywhere from $100 to $2,500. But for extra security, you may also want to invest in an automatic garage gate or door compatible with your garage security system. These can range from $200 to $4,000 in addition to the security system.


Some people prefer windows in a garage to add some natural light or match the home’s exterior. Of course, depending on the window type, size, placement and how many windows you’d like, the additional cost for windows in a garage is approximately $100 to $600 per window.


Building a garage is a large project requiring various materials for the foundation, the framing, the roofing, the wiring and the gutters. Therefore, the price of your garage will depend on which materials you choose for each element of the garage. On average, materials in total typically account for between 30% and 50% of the final cost. 

Number of Doors

Typically, the number of doors in your garage determines the square footage and installation cost. The more doors, the greater the cost. The cheapest option is usually a single garage door spanning the width of a garage entrance, followed by double-garage doors. A custom garage door will cost the most.

  • Single door: $600 to $1,500
  • Double door: $800 to $3,500
  • Custom door: Over $1,000

How much does it cost to build a garage with living quarters?

The cost of building a garage with living quarters is not that much different from the cost of building just a garage. The main difference is that you will need to add in the costs of things like plumbing and electrical work, as well as some additional insulation and wall treatments. You should also account for the cost of finishing off the interior of your new home.

There are several factors that can affect the price of your project, such as whether or not you have any existing structures on your property or other factors that may make your project more complicated than others.

Labor costs for this type of project will vary depending on where you live and what kind of work needs to be done. For example, if you live in a rural area then there might be fewer options available for hiring contractors, which means that their hourly rates may be higher than in more populated areas.

In general though, the average labor rate for this type of job ranges from $25-30 per hour and includes things like:

How Much Does It Cost to Build a 3 Car Detached Garage?

Garage construction costs vary by region and how you build it. Here are some estimates for building a garage with living quarters:

The average cost of garage construction is $10,000 to $25,000.

The average cost per square foot of garage construction is $150 to $350.

The average cost of labor for garage construction is $20 to $40 per hour.

The cost to build a 3 car detached garage will vary depending on your location and the contractor you hire. The national average cost for a garage with living quarters is $70,300.

The cost of this project will depend on the size of your home and the type of materials used. The more expensive materials usually include brick, stone, or wood siding.

The average labor cost to build a garage with living quarters is $19 per square foot. This number varies greatly depending on where you live and whether you hire someone to do it for you or do it yourself.

If you’re looking for a professional contractor in your area who can help you with this project, check out our list of contractors here:

The cost of building a garage with living quarters depends on several factors, including the size and number of rooms in the house, the quality of materials used and whether you hire a contractor or do it yourself.

The average cost to build a small garage with living quarters is $80 per square foot. This figure includes all labor, materials and permits required for construction. The average size of this type of structure is 1,200 square feet; therefore, the total cost would come out to $96,000.

The average cost of building a detached garage with living quarters is $175 per square foot. This figure includes all labor, materials and permits required for construction. The average size of this type of structure is 2,500 square feet; therefore, the total cost would come out to $417,750.

The cost to build a garage varies based on the size, material and location of the garage. In general, you can expect to pay between $200 and $500 per square foot for a garage with living quarters. A typical detached garage measures approximately 1,000 square feet and costs around $20,000 to construct.

A garage with living quarters is an extension of your home that offers additional space for parking as well as an apartment for rent or home office use. The average cost of building such a structure depends on its size, location and construction materials used.

Cost Factors

The average cost for building a detached garage with living quarters depends on several factors like:

Size: The size of the structure impacts its price considerably. The larger the structure is, more material and labor will be required to build it. For instance, a 2-car detached garage will be cheaper than a 3-car one because it uses less materials and manpower due to its smaller size.

Construction Materials Used: The type of construction materials used also affects the overall cost of building a garage with living quarters significantly. For instance, cinder blocks are cheap but concrete blocks are more durable hence they cost more than cinder blocks but less than wood

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