Most common double garage door sizes
Clopay describes 16 ft wide × 7 ft high as the baseline two-car door, with double doors typically ranging from about 12 to 18 ft wide. 16 × 8 is a popular choice for taller vehicles, and 18 ft widths give more space between two full-size vehicles.
Diagram: two approximate midsize SUV outlines (body width, no mirrors) in a 16 × 7 opening.
Double garage door size chart
| Size (W × H) | Inches | Millimetres | Category | Notes |
|---|---|---|---|---|
| 12′ × 7′ | 144″ × 84″ | 3658 × 2134 | 1.5-car / small double | Fits a car plus a motorcycle, mower or golf cart. |
| 12′ × 8′ | 144″ × 96″ | 3658 × 2438 | 1.5-car / small double | Taller oversized opening. |
| 14′ × 7′ | 168″ × 84″ | 4267 × 2134 | Double | Narrower double; works for two compact vehicles. |
| 15′ × 7′ | 180″ × 84″ | 4572 × 2134 | Double | Listed as a standard width by some manufacturers. |
| 16′ × 7′ | 192″ × 84″ | 4877 × 2134 | Double | The most widely cited two-car size in the US. |
| 16′ × 8′ | 192″ × 96″ | 4877 × 2438 | Double | Two-car door with extra height for SUVs and trucks. |
| 18′ × 7′ | 216″ × 84″ | 5486 × 2134 | Double | Wider double for full-size vehicles. |
| 18′ × 8′ | 216″ × 96″ | 5486 × 2438 | Double | Wide and tall double. |
Nominal sizes (width × height). In the US the nominal size normally equals the finished opening.
16 ft vs 18 ft: which width?
With two vehicles side by side, the space that matters is what’s left between them and beside each. Two 76-inch-wide SUVs in a 192-inch (16 ft) opening leave about 13 inches per gap before mirrors; in a 216-inch (18 ft) opening that rises to about 21 inches. Run your own numbers in the calculator.
| Door width | Two compact cars (70″) | Two midsize SUVs (76″) | Two full-size pickups (80″) |
|---|---|---|---|
| 16 ft (192″) | ≈17″ per gap | ≈13″ per gap | ≈11″ per gap |
| 18 ft (216″) | ≈25″ per gap | ≈21″ per gap | ≈19″ per gap |
Three gaps (left, middle, right), body widths only, illustrative vehicle sizes. Real vehicles vary.
One double door or two single doors?
One wide door
- No centre post, so parking at an angle is easier.
- One opener and one set of springs.
- Larger, heavier door — the whole door opens every time.
Two single doors
- Open only the side you need.
- If one door fails, the other still works.
- The centre post narrows the effective space for each vehicle.
Converting two singles into one double
Removing the post between two doors usually means installing a longer structural header to carry the load above. That is structural work: involve a qualified builder or engineer and check permit requirements with your local building department. Our installation guide covers what to prepare.
Double doors in the UK and Australia
A common UK double up-and-over size is 14′ × 7′, while Australian builders commonly use 4800 × 2100 mm openings for double doors. See the regional table.
Reference sizes only
Typical sizes from Clopay’s buying guide and regional supplier guides. Confirm exact sizes with your manufacturer or installer.
Frequently asked questions
Is a 16 ft door enough for two cars?
It works for many pairs of vehicles, but two full-size trucks or SUVs can feel tight. 18 ft widths give more room for doors and mirrors.
Is one double door better than two single doors?
Neither is universally better. A single wide door is easier to drive through at an angle; two singles keep a central post, can reduce the weight of each door and let you open just one side.
Can I convert two single doors into one double?
Often, but removing the centre post usually requires a new structural header. Consult a structural engineer or qualified builder and check permit requirements.
Ready to replace or install a door?
Have a professional confirm your measurements, clearances and structural requirements before you order.