Garage door size chart: single and double
One clear size per row. Widths and heights below are the nominal door dimensions, in feet.
| Type | Width | Height | Notes |
|---|---|---|---|
| Single | 8 ft | 7 ft | Most common single-car opening |
| 9 ft | 7 ft | Wider single, more clearance each side | |
| 9 ft | 8 ft | Taller single, extra headroom | |
| Double | 14 ft | 7 ft | Narrow double, less common in the GTA |
| 16 ft | 7 ft | The standard double garage door size | |
| 16 ft | 8 ft | Extra headroom, common with trucks and tall SUVs | |
| 18 ft | 7 ft | Wide double, frequently custom-order | |
| 18 ft | 8 ft | Wide and tall, frequently custom-order |
RV and oversized-vehicle doors typically start at 8 ft of height and run taller. They are a separate category from the standard sizes above.
The 16×7 garage door: the standard double
16 feet wide by 7 feet tall is the default double garage door size in the GTA, sized for two vehicles parked side by side. Builders spec it because it fits a standard two-car garage footprint using off-the-shelf door panel stock, which keeps replacement cheap and fast when the opening already exists at that width.
A 16×8 door makes sense when the vehicles using it are tall: full-size trucks and 3-row SUVs need more headroom clearance for the door track and opener than a standard 7-foot opening leaves. An 18-foot door makes sense for three-vehicle-wide garages, or for openings created by combining two single doors, which frequently come out wider than 16 feet once the centre post is gone.
What actually fits through a 16-foot double door
Two vehicles fit side by side in a 16-foot opening, but mirror clearance is the real constraint, not the door width on the spec sheet. Today's trucks and SUVs are wider, mirror to mirror, than the sedans the 16-foot standard was set around decades ago, so the margin is tighter than the number suggests.
See exactly how your vehicle fits with the vehicle-fit checker on our homepage, which compares your specific make and model, mirrors included, against an 8-foot single and a 16-foot double, to scale.
When your opening is wider than standard
Openings created by combining two single garage doors usually end up wider than the 16-foot standard, so the replacement door is frequently custom-width. Two 8- or 9-foot single openings, plus the width the centre post itself occupied, typically produce a clear span past 16 feet once the post comes out.
That is normal, not a complication: the door is measured and supplied to fit the actual opening, not forced to a catalogue size. See the full process for combining two single doors into one on the conversion hub, and how a custom-width door is priced on the cost guide.
Buying and spec notes
- Insulated vs. not: an insulated door runs quieter and holds heat better if the garage is heated or attached to living space; an uninsulated door costs less upfront.
- Headroom for tracks and opener: every opening needs clearance above the finished height for the track curve and the opener rail, more if a high-lift or low-headroom track is required.
- Panel style is separate from size: window layout and panel design affect price and looks; they do not change the width and height chart above.
Size questions, answered plainly
How wide is a double garage door?
A standard double garage door is 16 feet wide. Wider variants exist at 14 feet and 18 feet, and openings created by combining two single doors often fall outside all three, which is why custom widths are common for conversions. .
What is the standard double garage door size?
16 feet wide by 7 feet tall, written as 16x7. It is the most common double garage door size in North America and the default most builders install unless a taller opening is specified. .
How wide is a single garage door?
A single garage door is typically 8 to 9 feet wide, with 7 to 8 feet of height. Most GTA homes built with two single doors used 8-foot widths, which is narrower than most modern vehicles are comfortable with. .
Will two cars fit through a 16-foot door?
Yes, two vehicles fit side by side in a 16-foot opening, but mirror clearance is the real constraint, not the door width on the spec sheet. Full-size trucks and 3-row SUVs leave less room than the number suggests. .
What size door do I need after combining two singles?
Often wider than 16 feet. Two single openings plus the removed centre post typically produce a clear span past the 16-foot standard, so the replacement is frequently a custom-width double door measured to your actual opening. .
Are custom widths available?
Yes. When an opening does not match a standard size, the door is measured, specified, and supplied to fit it exactly. This is the normal outcome of a two-to-one conversion, not an exception. .
Not sure what size your new opening will be?
Sixty seconds tells you your candidate status and whether your opening lands standard or custom.