Garage Door Sizes Chart: Standard Dimensions Explained

Ordering the wrong size door is an expensive mistake, which is exactly why a reliable garage door sizes chart saves homeowners hundreds of dollars and a return trip to the supplier. Most residential garage doors fall into a handful of standard widths and heights, but the number that actually matters when you order is the rough opening, not the door panel itself. Measure once against a real garage door sizes chart and you will know instantly whether you have a single, double, or an oddball custom opening that needs a special order.

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Standard Single-Car Door Sizes

Single-car doors are the most common on older homes and detached garages. Widths run in even increments, and heights are usually 7 feet, though 8-foot doors are increasingly popular for trucks and SUVs.

• 8 ft wide x 7 ft tall — tight, older homes and compact cars
• 9 ft wide x 7 ft tall — the most common single-car size in the US
• 10 ft wide x 7 ft tall — extra clearance for wider vehicles
• 9 ft or 10 ft wide x 8 ft tall — pickups, lifted vehicles, cargo vans

If you drive a full-size pickup, the 9-by-8 is worth the small upcharge. That extra foot of height clears roof racks, ladder mounts, and taller antennas that a 7-foot door would clip.

Standard Double-Car Door Sizes

Double doors span two bays with a single panel and are standard on most homes built after the 1990s. The width jump is significant, so the tracks, springs, and opener all need to be rated for the larger door.

• 12 ft wide x 7 ft tall — narrow double, older or budget builds
• 14 ft wide x 7 ft tall — common on smaller two-car garages
• 16 ft wide x 7 ft tall — the standard American double door
• 16 ft or 18 ft wide x 8 ft tall — modern two-car garages with taller ceilings

The 16-by-7 is the workhorse of suburban construction. If you are replacing a builder-grade door, there is a strong chance this is what you have. An 18-foot width shows up on wider three-bay layouts where two vehicles share one large opening.

RV and Oversized Garage Doors

Motorhomes, boats on trailers, and lifted trucks need serious clearance. RV garage doors typically start at 10 feet tall and climb from there, with widths matched to the vehicle plus turning room.

• 10 ft wide x 10 ft tall — small Class C RVs and box trucks
• 12 ft wide x 12 ft tall — larger motorhomes and boats
• 16 ft wide x 14 ft tall — the largest common residential RV door

Once you pass 14 feet in either direction, expect a custom order with a lead time of several weeks and heavier torsion-spring hardware. These doors also demand more headroom above the opening for the tracks to run.

Rough Opening: The Measurement That Counts

Here is the detail that trips people up. A “9 by 7” door needs a rough framed opening that matches the nominal size, not a larger one. The finished masonry or framed opening should equal the door dimensions almost exactly, with the manufacturer’s stated tolerance. So a 16-by-7 door fits a 16-foot-wide by 7-foot-tall rough opening.

Beyond width and height, three clearances make or break the install:

• Headroom: the space above the opening for the tracks, typically 10 to 12 inches for standard lift, up to 15 inches for some opener setups
• Side room: at least 3.75 inches on each side of the opening for the vertical track and hardware
• Backroom: door height plus roughly 18 inches of depth into the garage so the door can roll fully open

Skip these checks and a perfectly sized panel still will not work because the track has nowhere to go. Low-headroom track kits exist for tight garages, but they cost more and change how the springs mount.

How to Measure Your Existing Opening

Grab a tape measure and record numbers to the nearest 1/8 inch. Measure the width at the finished opening from the inside edge of one side jamb to the other. Measure the height from the floor to the underside of the header. Then check the three clearances above. Write everything down before you shop, because a supplier will ask for all five figures.

If your floor slopes or the header is not level, measure at several points and use the smallest opening dimension. A door built to the largest measurement will bind against the frame at the tight spots.

Custom and Non-Standard Sizes

Older homes, carriage houses, and additions frequently have openings that fall between standard sizes. Manufacturers build custom doors in 1-inch width increments and various heights, but the price climbs. A custom door often runs 20 to 40 percent more than a stock size, and lead times stretch to three or four weeks. Before you commit to custom, ask whether reframing the opening to a standard size would be cheaper than the door premium. Often a few hours of carpentry to reach a stock 9-by-7 costs less than the custom surcharge over the life of the door.

Matching Springs, Tracks, and Openers to Size

Door size drives everything behind the door. A 16-foot double weighs far more than a 9-foot single, so it needs a heavier torsion spring rated for its weight and cycle life. Openers are rated in horsepower and by door size; a 1/2-horsepower opener handles most single doors, while a 3/4-horsepower or higher unit is safer for a heavy insulated double. When you use a garage door sizes chart to plan a replacement, note the weight and insulation of the door too, because an uninsulated steel double and a triple-layer insulated version of the same dimensions can differ by 50 pounds or more, and that affects spring selection.

Get the numbers right the first time and installation is routine. Confirm your rough opening, verify the three clearances, and cross-check the panel against the chart before you order. That short exercise turns a costly guess into a straightforward upgrade.

Panel Height and Section Counts

Beyond the overall door height, it helps to understand how sectional doors are built. A standard 7-foot door is typically made of four horizontal sections, each about 21 inches tall, while an 8-foot door usually adds a fifth section. This matters when you are matching a replacement to existing tracks or ordering insulated panels, because the section count affects both the appearance and how the door tracks bend as it rolls up.

If you are only replacing a single damaged panel rather than the whole door, you must match the exact section height, panel design, and manufacturer, which is often difficult on older doors. In many cases the cost and hassle of matching a discontinued panel makes full replacement the more sensible choice.

Insulation and Its Effect on Sizing

Door thickness varies with insulation, and that plays into the opening and hardware. Single-layer steel doors run roughly 2 inches thick, while triple-layer insulated doors with polyurethane cores can be 2 to 3 inches thick and considerably heavier. Insulation is rated by R-value, ranging from around R-6 for basic insulated doors to R-18 or higher for premium models, which matters a great deal if the garage is attached or heated.

The added weight of an insulated door changes the torsion spring and opener requirements even at the same nominal size, so factor insulation into your plan rather than treating it as an afterthought. A 16-foot insulated double can weigh well over 150 pounds, which demands a properly sized spring and a robust opener.

Common Sizing Mistakes to Avoid

A few errors show up over and over. Measuring the old door panel instead of the rough opening leads to ordering the wrong size, since the panel and the framed opening are different things. Forgetting to check headroom results in a door that fits the opening but has nowhere for the tracks to travel. And overlooking floor slope means the door binds on one side because the opening was not measured at multiple points.

Take your time, record every dimension to the nearest 1/8 inch, and photograph the existing setup before removing anything. When you cross those measurements against a reliable garage door sizes chart, you eliminate the guesswork that leads to returns, delays, and doors that never quite fit right.