What is the most common garage door size?

For a single-car door, 9×7 ft is the most common, with 8×7 close behind. For a two-car door, 16×7 ft is the classic size, with 16×8 ft increasingly common for tall vehicles. All four are standard US sizes.

What is the standard height of a garage door?

Seven feet is the long-standing residential standard; eight feet is common on newer builds and for tall SUVs, trucks and roof boxes. Taller heights exist for RV and shop bays but often move you into custom territory.

How many square feet is a 16x7 garage door?

112 square feet (16 × 7). That area drives the cost by size and the door weight — a 16×7 two-layer steel door is roughly 291 lb. Use the cost by size and weight estimator tools.

What is the widest standard garage door?

The widest common standard is the 16-ft double (16×7 or 16×8), which covers a typical two-car bay. Wider single openings (10 ft) and larger doubles (18 ft) exist on some builds, and RV or shop bays go wider still, but those move toward custom, taller-header territory. For most homes, 16 ft is the practical maximum standard width.

Do I need a custom garage door?

Only if your opening falls outside the standard sizes (odd width, very tall height, arched top, non-standard thickness). Custom doors cost more and take longer, so design around a standard size where you can. If not, estimate the premium with the custom door tool.

Standard garage door sizes explained

US garage doors come in a handful of standard sizes. Knowing them makes cost, opener and framing decisions much easier — and tells you when you are really ordering a custom door. Measure your opening first, then match it to the nearest standard to see whether you are shopping in stock or custom territory.

By Francesco Zinghinì

Most residential garage doors in the US come in a small set of standard sizes, which is good news: standard sizes are cheaper, faster to get and easier to frame than custom. The four you will meet most often are 8×7, 9×7, 16×7 and 16×8 feet (width × height).

Single-car doors: 8×7 and 9×7

A single-car door is usually 8 or 9 feet wide by 7 feet tall. The 9×7 is the more forgiving choice for wider vehicles and easier parking; the 8×7 suits tighter openings and older homes. In area terms, 8×7 = 56 sq ft and 9×7 = 63 sq ft. Square footage matters because it drives both the cost by size (width × height × $/sq ft) and the door weight (area × lb/sq ft), which in turn sets the spring and opener you need.

Double-car doors: 16×7 and 16×8

A double door is typically 16 feet wide. Height is where the decision lives: 16×7 (112 sq ft) is the classic two-car door, while 16×8 (128 sq ft) gives extra clearance for tall SUVs, roof boxes and pickups. If you drive anything tall, the 8-ft height is worth the small premium. Two-car garages sometimes use two single doors with a center post instead of one double; that is a look-and-redundancy choice, and usually a bit more expensive because it needs two openers — compare with the single vs double tool.

Why 7 ft is the default height

Seven feet has long been the standard residential height because it clears typical passenger vehicles while keeping the header and framing simple. Eight-foot doors have become common on newer builds and in regions where large trucks and SUVs dominate. Nine- and ten-foot heights exist for RV bays and shops but move you firmly into taller-header, sometimes-custom territory.

When a “size” is really a custom order

Anything outside the standard grid — an odd width, a very tall RV door, an arched top, a non-standard thickness — is a custom door. Custom means longer lead times and a price premium, so if you can design around a standard size you will save money. If you cannot, budget for the premium using the custom & carriage-house tool.

Size drives everything downstream

The size you pick ripples through the whole project:

Cost: more area = more material and labor. A 16×8 double is the priciest of the four standards.
Weight: a 16×7 two-layer steel door is roughly 112 sq ft × ~2.6 lb/sq ft ≈ 291 lb — heavy enough to need the right spring and a ¾ HP opener. See the weight estimator.
Springs: heavier doors need higher-load springs, and the balance must be right for safety and opener life.
Framing: the rough opening equals the door size, with added headroom, backroom and side room. See the rough opening tool.

How to measure your existing door

Measure the opening width and height at the widest and tallest points, not the door panel itself, since trim can mislead you. Round to the nearest standard size to see whether you are in stock or custom territory. Also note the room to each side (side room), the space above the opening (headroom) and the depth from the opening back into the garage (backroom) — these determine which spring and track system fits and are exactly the inputs the clearance helper asks for.

Odd sizes you might still meet

Beyond the four core standards, a few other sizes turn up often enough to know. Ten-foot-wide singles (10×7 or 10×8) exist for wider single bays and light trucks. Eighteen-foot doubles (18×7) appear on newer builds with generous two-car garages. RV and shop bays run to 10-, 12- or even 14-foot heights and are firmly custom, taller-header territory. And older homes sometimes have genuinely non-standard openings from a bygone framing convention — a common surprise when a homeowner assumes any door will drop in. The practical lesson is to measure before you shop: a tape measure and five minutes tell you whether you are buying a stock door at a stock price or commissioning a custom one. If your opening is within an inch or two of a standard, an installer can usually adapt the framing; if it is far off, plan for a custom order and its lead time.

The bottom line

Stick to 8×7 or 9×7 for a single and 16×7 or 16×8 for a double and you get the widest selection at the lowest price. Choose the 8-ft height if you park anything tall. Step outside the standard grid only when you must, and budget for the custom premium. All of these sizes are labeled conventions, not rules — confirm the exact fit with your installer and your opening’s real measurements.