How Many Square Feet in a Double Garage?

If you’re wondering how many square feet are in a double garage, the answer depends on its dimensions. A double garage, also called a two-car garage, is commonly designed to accommodate two vehicles side by side.

A frequently used size is 20 feet × 20 feet, which provides:

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$A=6\times4=24$A=6×4=24

4 rows by 6 columns = 24 square units.

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$l$l24 square unitsw = 6l = 4

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20 × 20 = 400 square feet

However, double garages come in many sizes. A smaller 18 × 20-foot garage has 360 square feet, while a more spacious 24 × 24-foot garage provides 576 square feet.

For practical planning, a typical double garage may range from approximately 360 to 600 square feet, depending on vehicle sizes, storage requirements, workshop space, and local building practices.

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Quick Answer: How Many Square Feet Is a Double Garage?

A standard double garage often falls within the following range:

360–600 square feet

Some common dimensions include:

Garage Dimensions	Square Feet
18 × 20 ft	360 sq ft
20 × 20 ft	400 sq ft
20 × 22 ft	440 sq ft
20 × 24 ft	480 sq ft
22 × 22 ft	484 sq ft
24 × 24 ft	576 sq ft
24 × 26 ft	624 sq ft

A 20 × 20-foot double garage, at 400 square feet, is a useful benchmark for a basic two-car garage.

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What Is a Double Garage?

A double garage is a garage designed to accommodate two vehicles.

It can have:

• One wide garage door
• Two individual garage doors
• Two parking spaces
• Storage areas
• Workbench space
• Shelving
• Additional equipment

The phrase “double garage” generally refers to capacity rather than one specific set of dimensions.

A double garage can therefore be 18 × 20 feet, 20 × 20 feet, 24 × 24 feet, or another size.

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What Is the Standard Size of a Double Garage?

There isn’t one universal standard size.

However, 20 × 20 feet is a commonly used starting point for a basic two-car garage.

That gives:

400 square feet

A larger design, such as 24 × 24 feet, provides:

576 square feet

The extra space can make a significant difference if you want to store tools, bicycles, lawn equipment, shelving, or other belongings.

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How Big Is a 20 × 20 Double Garage?

A 20 × 20-foot garage has:

20 feet × 20 feet = 400 square feet

This is enough floor area for two vehicles in many layouts, but the actual usable space depends on:

• Vehicle dimensions
• Door placement
• Wall thickness
• Storage
• Interior obstacles
• Garage door configuration

A 20 × 20 garage may feel comfortable for parking two smaller vehicles but can become crowded with two large SUVs or pickup trucks plus substantial storage.

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How Many Square Feet Is an 18 × 20 Garage?

An 18 × 20-foot garage provides:

18 × 20 = 360 square feet

18 × 20 garage = 360 square feet

This is toward the smaller end for a double garage.

It may work well when:

• Vehicles are relatively compact
• Storage requirements are limited
• Property space is restricted
• The garage is primarily for parking

However, opening vehicle doors and walking around both cars can be more challenging in a narrower garage.

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How Many Square Feet Is a 20 × 22 Garage?

A 20 × 22-foot garage provides:

20 × 22 = 440 square feet

20 × 22 garage = 440 square feet

The additional 40 square feet compared with a 20 × 20 garage can provide extra room for:

• Shelving
• Storage cabinets
• Bicycles
• Tools
• Workbench space

Even a small increase in garage depth can improve usability.

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How Many Square Feet Is a 20 × 24 Garage?

A 20 × 24-foot garage provides:

20 × 24 = 480 square feet

20 × 24 garage = 480 square feet

This is a popular type of larger two-car garage because the additional depth provides more room behind parked vehicles.

That space can be useful for:

• Lawn equipment
• Storage shelves
• Freezers
• Workbenches
• Bicycles
• Sports equipment

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How Many Square Feet Is a 24 × 24 Garage?

A 24 × 24-foot garage provides:

24 × 24 = 576 square feet

24 × 24 garage = 576 square feet

This is considerably more spacious than a 20 × 20 garage.

The additional 176 square feet can make it easier to combine vehicle parking with storage or workshop space.

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How Many Square Feet Do Two Cars Need?

The amount of space needed depends on the vehicles.

A typical passenger car may be around:

• 14–16 feet long
• 5.5–6.5 feet wide

Larger SUVs and pickup trucks can be:

• 17–21+ feet long
• 6–7+ feet wide

Two vehicles therefore require considerable width, especially when you account for space to open doors and walk between the vehicles and walls.

This is why a garage that’s technically large enough for two cars may still feel cramped.

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Is a 20 × 20 Garage Big Enough for Two Cars?

A 20 × 20-foot garage provides 400 square feet and can accommodate two vehicles.

However, whether it feels comfortable depends on vehicle size and storage requirements.

For two compact or midsize vehicles, 20 × 20 can be practical.

For two large trucks or SUVs, a wider or deeper garage may be more comfortable.

If you want substantial storage space as well, consider a larger footprint.

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Is a 24 × 24 Garage Big Enough for Two Cars?

Yes. A 24 × 24-foot garage provides 576 square feet and offers substantially more room.

The additional space can make it easier to:

• Park two vehicles
• Open doors
• Walk around vehicles
• Store equipment
• Add shelving
• Install a workbench
• Create a small workshop area

For homeowners who use their garage for more than parking, 24 × 24 feet can be a more flexible layout.

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Double Garage Size Comparison

Garage Size	Square Feet	General Use
18 × 20	360	Compact two-car garage
20 × 20	400	Basic two-car garage
20 × 22	440	Two cars + some storage
20 × 24	480	Two cars + better storage
22 × 24	528	Spacious two-car garage
24 × 24	576	Two cars + substantial storage
24 × 26	624	Large two-car garage/workshop

These are floor-area calculations; local building requirements and actual interior dimensions can differ.

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Double Garage Dimensions: Width vs. Depth

When planning a double garage, both dimensions matter.

Garage Width

Width determines:

• How easily two vehicles fit side by side
• Door-opening space
• Walking clearance
• Storage along side walls

Garage Depth

Depth determines:

• Whether long vehicles fit comfortably
• Space behind vehicles
• Storage opportunities
• Workbench placement

A garage with more depth can be useful if you want storage behind your vehicles.

A wider garage can be better if you need comfortable door clearance and side-wall storage.

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How Much Space Should Be Left Around Each Vehicle?

The exact clearance depends on the vehicle and your preferences.

You need enough space for:

• Opening doors
• Walking around the vehicle
• Loading and unloading
• Accessing storage
• Getting into the vehicle safely

Simply fitting two vehicle rectangles inside a garage isn’t enough.

For example, two 6-foot-wide vehicles would occupy about 12 feet of width, but a practical garage needs additional clearance between the vehicles and walls.

This is why a garage designed exactly around vehicle dimensions can feel uncomfortable.

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Does a Double Garage Include Storage Space?

Not necessarily.

When someone says a garage is 400 square feet, that usually describes the overall floor area.

The usable parking area is reduced by:

• Shelving
• Cabinets
• Workbenches
• Refrigerators
• Freezers
• Lawn equipment
• Bikes
• Tools
• Storage bins

For example, a 400-square-foot garage may technically be large enough for two cars, but adding extensive storage can make the parking area feel much smaller.

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How Much Storage Can Fit in a Double Garage?

A larger garage gives you much more flexibility.

A 20 × 20 garage can potentially accommodate two cars with limited storage.

A 20 × 24 garage gives additional depth for storage.

A 24 × 24 garage can provide room for:

• Two vehicles
• Wall-mounted shelving
• Cabinets
• Workbench
• Bicycles
• Yard tools

The best size depends on whether parking or storage is your primary goal.

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Double Garage With a Workshop

If you want to use part of the garage as a workshop, consider increasing the size.

A 20 × 20 garage may work for parking but can become crowded once you add:

• Workbench
• Tool chest
• Saw
• Compressor
• Shelving
• Material storage

A 24 × 24-foot garage offers 576 square feet, giving you substantially more flexibility.

If workshop use is a major priority, an even deeper garage may be worthwhile.

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Double Garage With an SUV or Truck

Large vehicles require additional space.

A full-size pickup truck can be significantly longer and wider than a compact car.

Before choosing garage dimensions, measure:

1. Vehicle length
2. Vehicle width
3. Side mirrors
4. Door clearance
5. Tailgate clearance

Then allow additional space around the vehicle.

If both vehicles are large SUVs or trucks, a 22–24-foot-wide garage may be more comfortable than a narrow two-car design.

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How Many Square Feet Is a Double Garage With Two Doors?

The number of garage doors doesn’t determine square footage.

For example, both of these could have the same floor area:

• 20 × 20 garage with one double-width door
• 20 × 20 garage with two single doors

Both contain:

400 square feet

The difference is the door configuration rather than the floor area.

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Single Garage vs. Double Garage

Feature	Single Garage	Double Garage
Vehicles	1	2
Typical width	~10–14 ft	~18–24 ft
Common floor area	~200–300 sq ft	~360–600+ sq ft
Storage potential	Limited	Greater
Workshop potential	Limited	Better
Construction cost	Lower	Higher

These are general ranges, not universal standards.

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How to Calculate Double Garage Square Footage

If the garage is rectangular, calculating its area is simple.

A=lw

$A=6\times4=24$A=6×4=24

4 rows by 6 columns = 24 square units.

$w$w

$w$w

$l$l

$l$l24 square unitsw = 6l = 4

Give feedback

For example:

20 feet × 22 feet = 440 square feet

Another example:

24 feet × 24 feet = 576 square feet

The formula is:

Square footage = Length × Width

If the garage has an irregular shape, divide it into smaller rectangles, calculate each area separately, and add them together.

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Does Garage Square Footage Include the Walls?

It depends on how the measurement is being reported.

A builder, architect, appraiser, or real estate professional may use a particular measurement standard.

For planning purposes, it’s useful to distinguish between:

• Exterior dimensions
• Interior dimensions
• Finished floor area
• Total building footprint

For example, a garage advertised as 20 × 20 feet may have somewhat less than 400 square feet of usable interior floor area after accounting for wall thickness and other structures.

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Garage Door Size and Double Garage Space

Garage doors also affect the layout.

Common configurations include:

One Double Door

A wide door allows both vehicles to enter through one opening.

Two Single Doors

Each vehicle has its own garage door.

Two separate doors can provide some flexibility, while a single wide door creates a broad opening.

The best choice depends on:

• Garage width
• Vehicle size
• Exterior design
• Structural requirements
• Personal preference

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Is 400 Square Feet a Large Garage?

A 400-square-foot garage is a practical size for a basic two-car garage.

For example:

20 × 20 = 400 square feet

It provides enough overall floor area for two vehicles, but available storage and walking space depend heavily on vehicle dimensions.

If you want a workshop, extensive storage, or room for large vehicles, you may want more than 400 square feet.

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Is 500 Square Feet Enough for a Double Garage?

Yes. A garage around 500 square feet can provide comfortable space for two vehicles in many layouts.

For example:

20 × 25 = 500 square feet

or:

22 × 23 ≈ 506 square feet

This additional space can be used for:

• Storage
• Workbench
• Bikes
• Tools
• Lawn equipment

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Is 600 Square Feet a Large Double Garage?

A 600-square-foot garage is relatively spacious for a two-car garage.

For example:

24 × 25 = 600 square feet

This can provide plenty of room for two vehicles plus storage or a workshop, depending on the layout.

However, the ideal dimensions may be more important than the total square footage.

A long, narrow 600-square-foot garage can function differently from a square 600-square-foot garage.

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Common Mistakes When Planning a Double Garage

Mistake 1: Measuring Only the Cars

The garage needs clearance around the vehicles.

Mistake 2: Forgetting Storage

Shelving and cabinets can quickly consume floor space.

Mistake 3: Ignoring Door Clearance

You need room to open vehicle doors comfortably.

Mistake 4: Focusing Only on Square Footage

Two garages with identical square footage can have very different layouts.

Mistake 5: Forgetting Future Needs

Consider whether you’ll eventually own larger vehicles, add storage, or create a workshop.

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What Is the Best Double Garage Size?

There isn’t one best size for every homeowner.

For basic parking

20 × 20 feet (400 sq ft) can be a reasonable starting point.

For parking plus storage

20 × 22 or 20 × 24 feet (440–480 sq ft) offers more flexibility.

For larger vehicles and storage

22 × 24 or 24 × 24 feet (528–576 sq ft) can provide substantially more room.

For a workshop

Consider 24 × 24 feet or larger, depending on your equipment and storage requirements.

Always check local building codes and planning requirements before constructing or enlarging a garage.

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FAQs

1. How many square feet is a double garage?

A typical double garage may range from approximately 360 to 600 square feet. A common 20 × 20-foot garage has 400 square feet.

2. Is a 20 × 20 garage big enough for two cars?

Yes, a 20 × 20 garage provides 400 square feet and can accommodate two vehicles. However, large trucks or SUVs may make the space feel tight.

3. How many square feet is a 24 × 24 garage?

A 24 × 24-foot garage contains 576 square feet.

4. How many square feet is a 20 × 24 garage?

A 20 × 24-foot garage contains 480 square feet.

5. What is a good size for a two-car garage?

A 20 × 20-foot garage can work for basic parking, while 22 × 24 or 24 × 24 feet provides more comfortable space for vehicles, storage, and other uses.

6. Can a double garage fit two SUVs?

It can, but the garage should be wide and deep enough to provide adequate clearance around both vehicles. A larger garage is preferable for two full-size SUVs.

7. Does a double garage have exactly 400 square feet?

No. A double garage doesn’t have one fixed size. A 20 × 20-foot garage has 400 square feet, but double garages can be smaller or larger.

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Conclusion

So, how many square feet are in a double garage?

There is no single standard size, but a typical two-car garage often falls somewhere around 360–600 square feet.

A useful benchmark is:

20 × 20 feet = 400 square feet

Other common examples include:

• 18 × 20 = 360 sq ft
• 20 × 22 = 440 sq ft
• 20 × 24 = 480 sq ft
• 22 × 24 = 528 sq ft
• 24 × 24 = 576 sq ft
• 24 × 26 = 624 sq ft

If you’re planning a new garage, don’t focus only on the total square footage. Consider the width, depth, vehicle sizes, door clearance, storage, and intended use. A 400-square-foot garage may be adequate for two compact cars, while a household with two large trucks, extensive storage, or a workshop may benefit from 500–600+ square feet.

For most homeowners, 20 × 20 feet is a reasonable basic two-car garage size, while 24 × 24 feet offers considerably more flexibility.

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