Garage Door Size & Clearance Planner
Standard single garage doors are 9 ft wide × 7 ft tall; standard doubles are 16 ft wide × 7 ft tall. But the size chart only answers half the question — whether your door will actually fit depends on headroom, sideroom, and backroom clearance too. Enter what you know below (leave anything unmeasured at 0) for a size call and a spring/track recommendation you can hand to an installer.
How this works
Size guidance follows manufacturer size standards: single doors at 9 ft wide × 7 ft tall (8–10 ft wide, 7–8 ft tall covers most single bays), doubles at 16 ft wide × 7 ft tall, and 18 ft wide doubles for trucks and full-size SUVs that don't clear a standard double. A measured opening within 1 in of a standard size is called a stock size; anything further off is flagged as custom, which typically means a longer lead time and a price premium over stock.
Clearance guidance follows published spring and track hardware minimums: standard torsion springs need 12 in of headroom (15 in once an opener is added, since the opener adds roughly 3 in), extension springs need about 10 in, low-headroom front-mount torsion conversions get that down to about 9–9.5 in, and low-headroom rear-mount systems are the floor at about 4.5 in. Below that, a professional needs to evaluate structural options rather than swap hardware. Sideroom (wall space beside the opening) needs a 3.75 in minimum, up to 6.5 in for low-headroom systems, and backroom (floor space behind the opening) needs at least the door height plus 18 in.
This is a planning tool, not a measurement service — it works from the numbers you enter, and a 0 in any field is treated as 'not measured yet' rather than an actual zero. Garage Door Repair Network is a referral service: we route your request to independent local installers who take the final field measurements before quoting. Once you've got a size, price it at /tools/new-garage-door-cost-calculator and size the opener motor at /tools/garage-door-opener-hp-selector. Size and clearance figures are refreshed annually against the cited manufacturer spec pages.
Estimates only — independent local providers quote their own pricing. Data last reviewed 2026-08.
Frequently Asked Questions
What is the standard garage door size?
For a single-car door, 9 ft wide × 7 ft tall is the standard. For a two-car door, it's 16 ft wide × 7 ft tall. Single doors range from 8–10 ft wide and 7–8 ft tall depending on the garage and vehicle.
What size garage door do I need for a truck?
An 18 ft wide double door at around 8 ft tall clears most full-size trucks and SUVs — a standard 16×7 double is often too narrow or too short for taller trucks and lifted vehicles.
Can I install a garage door with low headroom?
Yes. Standard torsion springs need 12 in of headroom (15 in with an opener), but low-headroom hardware brings that down — front-mount torsion conversions work with about 9–9.5 in, and rear-mount systems work down to about 4.5 in. Below 4.5 in, a professional needs to evaluate structural options like raising the header.
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