Before you shop, it helps to know the common sizes and how to measure — getting this right avoids a lot of headaches on install day.
Common single-car sizes
8×7 and 9×7 (feet, width × height) are the standards. Older homes lean 8-foot; newer builds often go 9-foot for a little more room.
Common double-car sizes
16×7 is the classic two-car door. Many newer DFW homes use 18×7 for wider bays, and 8-foot-tall doors show up on homes built for trucks and SUVs.
How to measure your opening
- Width & height of the finished opening (not the door itself).
- Side room — space on each side of the opening (need ~3.75 in. for tracks).
- Headroom — space above the opening to the ceiling.
- Backroom — depth from the opening into the garage.
Not sure? We'll measure it free
Every new-door install starts with a free on-site measure, so you never have to guess. Ballpark your size and style in the designer, then we confirm the exact fit before anything is ordered.
Key takeaways
- Single-car standard: 8x7 or 9x7 feet; double-car standard: 16x7 (18x7 on newer builds).
- 8-foot-tall doors are common for trucks and SUVs.
- Measure the opening width/height plus side room, headroom, and backroom.
- Clearances decide what hardware fits — not just the opening size.
- A free on-site measure means you never have to guess.