Getting the Size Right Matters More Than You Think
A garage door that's too small leaves gaps that let in rain, bugs, and hot air. A door that's too big won't fit the opening. And ordering a non-standard size when a standard size would work means paying more and waiting longer for delivery.
Here's how garage door sizing works, what's standard, and how to figure out exactly what you need for your home.
Standard Residential Garage Door Sizes
Most garage doors in Tampa-area homes fall into one of three standard sizes:
Single-Car Garage: 8 x 7 Feet
The most common single-car garage door is 8 feet wide by 7 feet tall. This fits a standard sedan, small SUV, or compact truck with room to spare on the sides. You'll find this size on most older Florida homes, townhomes, and condos with one-car garages.
Some single-car garages use a 9 x 7 door, which gives you an extra foot of width. That foot matters if you drive a full-size truck or SUV. If your opening accommodates it, 9 x 7 is the better choice for modern vehicles that keep getting wider.
Double-Car Garage: 16 x 7 Feet
The standard double-car garage door is 16 feet wide by 7 feet tall. This is by far the most common size in Tampa suburban homes. Two average-size cars fit side by side with enough clearance to open doors, barely. If you park two full-size SUVs or trucks in a 16-foot opening, you'll be squeezing.
Some homeowners with double garages opt for two 8-foot single doors instead of one 16-foot double door. This gives a different look (and means one door can still work if the other breaks), but it costs more, two openers, two sets of hardware, two springs setups.
Oversized: 9 x 8 or 10 x 8 Feet
If you drive a lifted truck, a full-size van, or an SUV with a roof rack, the standard 7-foot height might not cut it. An 8-foot tall door gives you the extra clearance. These are common in newer Florida construction, where builders know that trucks and large SUVs dominate the market.
A 10 x 8 or 10 x 7 door is used in three-car garages or for oversized single bays. Some newer Tampa-area homes are being built with one oversized bay specifically designed for larger vehicles or a workshop area.
How to Measure Your Garage Door Opening
If you're replacing an existing door, you need to measure the rough opening, not the old door itself, since the old door might not have been the right size. Here's what to measure:
Width
Measure the width of the opening at the widest point, from one inside edge of the door frame to the other. Measure at the top and the bottom, if they're different (which happens in older homes where things settle), use the smaller number. Round down to the nearest standard size.
Height
Measure from the floor to the top of the opening. Again, measure on both sides in case the floor is uneven. Use the smaller number.
Headroom
This is the space between the top of the opening and the ceiling or any obstruction (ductwork, light fixture, storage platform). Standard garage door installations need at least 12 inches of headroom. If you have less than that, you'll need a low-headroom track kit, which adds $75 to $150 to the installation cost.
Sideroom
Measure the space on each side of the opening, from the edge of the opening to the nearest wall. Standard installations need at least 3.75 inches on each side for the vertical tracks. If one side is tighter, the track may need to be mounted differently.
Depth
Measure how deep the garage is from the door opening to the back wall. The door needs room to lay flat along the ceiling when open. A 7-foot-tall door needs at least 8 feet of depth (7 feet for the door plus clearance). An 8-foot-tall door needs about 9 feet. If your garage is shallow, a high-lift or vertical-lift track system can solve the problem, but it adds to the cost.
Non-Standard and Custom Sizes
Not every garage has a standard opening. Older Florida homes, custom builds, and converted spaces sometimes have odd dimensions, 7-foot-wide openings, 6-foot-6-inch heights, or widths that fall between standard sizes.
When you have a non-standard opening, you have two options:
- Modify the opening: Sometimes it's cheaper to have a carpenter adjust the framing to fit a standard-size door. Adding a few inches of height or width might be all you need. Standard doors are cheaper, ship faster, and have more style options.
- Order a custom-size door: All major manufacturers offer custom sizing. Expect to pay 20% to 40% more than a standard door, and lead times are typically 3 to 6 weeks instead of a few days. The door will fit perfectly, but you're paying for it.
Florida New Construction Standards
If you're building a new home in the Tampa area, current Florida building code and most builder standards have shifted toward larger openings. Here's what we see in new construction:
- Single-car bays: 9 x 8 or 10 x 8 (up from the old 8 x 7 standard)
- Double-car bays: 16 x 8 or 18 x 8
- RV/boat bays: 12 x 10 or 14 x 10
The trend is toward taller doors. The 7-foot standard was set decades ago when sedans were king. Today's trucks, SUVs, and crossovers are taller, and builders are responding. If you're designing a custom home, go with 8-foot-tall doors minimum, you'll never regret the extra headroom.
Common Sizing Mistakes
- Measuring the old door instead of the opening. The old door might be the wrong size. Always measure the rough opening.
- Forgetting about headroom. If you have ductwork, a garage door opener, or storage above the opening, you might not have enough clearance for a standard install.
- Not accounting for the opener. The opener motor unit hangs from the ceiling and takes up vertical space. If headroom is tight, factor in the opener before ordering the door.
- Buying too small for your vehicles. If you're replacing a door and you've switched from sedans to trucks since the house was built, this is your chance to upsize the opening.
Not sure what size you need? Champions Garage Door Service will come out and measure for free. We'll tell you exactly what fits your opening and whether any modifications make sense. Call (813) 999-5749 to schedule a measurement.