Estimate your garage build cost by type, size, and state. Includes foundation, framing, roofing, doors, electrical, and permits — adjusted for your local market.
2026 National Averages
How Much Does It Cost to Build a Garage in 2026?
Garage Type
1-Car
2-Car
3-Car
Home Value Added
Attached
$8,000–$18,000
$15,000–$30,000
$22,000–$45,000
$10,000–$20,000
Detached
$10,000–$22,000
$18,000–$38,000
$28,000–$55,000
$12,000–$25,000
Carport
$3,000–$7,000
$5,000–$12,000
$8,000–$18,000
$2,000–$6,000
Custom / ADU
$25,000–$55,000
$45,000–$90,000
$65,000–$130,000
$35,000–$80,000
The average 2-car detached garage costs $18,000–$38,000 in 2026. An attached 2-car garage costs $15,000–$30,000. A garage with an ADU above runs $45,000–$90,000.
Your Location
Garage Type
Attached
Connected to house, shared wall
Detached
Separate standalone structure
Carport
Open roof, no walls
Custom / ADU
Finished, livable space above
Garage Size
1-Car
12×20 ft standard
240 sq ft
2-Car
20×22 ft standard
440 sq ft
3-Car
30×22 ft standard
660 sq ft
Oversized
Custom or large format
900 sq ft
Garage Cost Buying Guide 2026
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Attached vs detached garage cost
Attached garages cost 15–20% less than detached because they share one wall and existing foundation. Detached garages offer more flexibility for future conversion to ADU or workshop. Choose attached if cost is the primary concern; detached if flexibility matters.
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The biggest cost factors
Size drives cost more than anything. Going from a 1-car to a 2-car garage adds 60–80% to the cost. The garage door itself ($800–$4,000) is a significant line item. Adding electricity adds $1,500–$4,000. Insulation and drywall add $3,000–$8,000 but dramatically improve usability.
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Regional price differences
Labor costs vary dramatically by state. A 2-car detached garage costs $18,000 in Mississippi but $45,000+ in California or Hawaii. Northern states require frost-depth footings which add $2,000–$5,000 vs southern states with shallow foundations.
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Garage ADU potential
Building a garage with an ADU (apartment) above costs $45,000–$90,000 for a 2-car setup but can generate $800–$2,500/month in rental income. Many states have streamlined ADU permitting — check your local rules before deciding on a standard garage.
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Hidden costs to budget for
Driveway extension: $2,000–$8,000. Landscaping after construction: $1,000–$5,000. Garage floor coating: $1,500–$4,000. Storage systems: $500–$5,000. Always add 15% contingency to your garage estimate for unexpected site conditions.
Frequently Asked Questions
How much does it cost to build a 2-car garage in 2026?
A 2-car detached garage costs $18,000–$38,000 in 2026 for a standard 20×22 ft structure. An attached 2-car garage costs $15,000–$30,000 since it shares one wall. In high-cost states like California or New York, add 30–45% to these estimates.
How much does a garage add to home value?
An attached or detached garage adds $10,000–$25,000 to home value for a standard 2-car garage. In markets where garages are rare (urban areas, condos), the value add can be higher. A garage with a finished ADU above can add $40,000–$80,000 in value.
How long does it take to build a garage?
A standard 2-car detached garage takes 1–3 weeks to construct once permits are approved. Permit approval typically takes 2–6 weeks. Custom garages or ADUs take 4–8 weeks for construction. Total project timeline from start to occupancy is 2–4 months.
Do I need a permit to build a garage?
Yes — building permits are required for garages in virtually all US municipalities. Permit fees range from $200–$1,500 depending on size and location. Unpermitted garages create problems at resale and may need to be demolished or permitted retroactively.
What is the cheapest type of garage to build?
A carport is the cheapest option at $3,000–$12,000 but provides no security or weather protection. Among enclosed garages, an attached 1-car garage is the most affordable at $8,000–$18,000. Prefab metal garage kits can be cheaper at $5,000–$15,000 but require assembly.