Common single-car door sizes
Standard single-car garage doors are commonly built around widths in the 8–9 foot range, with heights typically 7 or 8 feet, though older homes can have narrower or shorter openings than modern standard sizing. Some homes built before modern sizing conventions may have openings that don’t match today’s common stock sizes at all.
Common double-car door sizes
Double-car (two-car) garage doors commonly run in the 16 foot width range, though some homes use two separate single-car doors instead of one wide double door. Height standards are generally consistent with single-car doors (7 or 8 feet), though taller vehicles like trucks and SUVs have driven some newer construction toward 8-foot-plus heights.
Why exact measurement still matters
Even within "standard" size ranges, actual rough opening dimensions vary enough between homes that accurate on-site measurement is important before ordering a replacement door, track hardware, or opener. A professional measurement also accounts for headroom (space above the opening for the track curve) and backroom (depth needed for the horizontal track), both of which affect what door and opener configuration will actually fit.
Non-standard and custom sizes
RV garages, older homes, and custom-built houses sometimes have openings outside standard sizing, requiring a custom-order door. This generally costs more and takes longer to fabricate than stock sizes, which is worth planning for if you suspect your opening may be non-standard.
Frequently asked questions
What is the most common garage door size for a two-car garage?
A single wide door in the 16-foot-width range is common for two-car garages in many newer homes, though plenty of homes instead use two separate single-car doors side by side.
How do I know if my garage door opening is non-standard?
If your home is older, custom-built, or designed for oversized vehicles (RVs, larger trucks), there’s a reasonable chance the opening falls outside common stock sizes — a professional measurement will confirm this before ordering.
Does door height matter for taller vehicles?
Yes — taller trucks and SUVs need adequate clearance, which has pushed some newer construction toward 8-foot-plus door heights instead of the older 7-foot standard.