A customer at a garage door company I spoke with recently had a straightforward problem. He'd replaced his older sedan with a lifted F-150 and his existing garage door - a 7-foot-tall single door installed about twelve years ago - cleared the truck by approximately two inches. Getting in and out was possible. It required him to go slow, hold his breath a little, and pray that he'd never need to put a roof rack on the truck.
He'd been living with this for eight months before he finally called someone. Eight months of holding his breath every time he pulled in.
Sizing matters. And the tricky part is that "standard" garage door sizes are built around vehicles from decades ago, not the trucks and SUVs that are actually sitting in most American driveways right now. What was standard in 1995 is often marginal in 2026.
Here's how to think through it properly.
Start with what's going in the garage - not what's already on the door
Most guides tell you to measure your existing opening first. That's the right second step, but the first step is figuring out what the door actually needs to accommodate. If your current door is already too small, measuring it just tells you the wrong size.
Measure your vehicles first. Width with mirrors extended. Height with any roof-mounted accessories - antennas, roof racks, cargo carriers, anything that's taller than the roofline. For SUVs and trucks, measure the full height from ground to the top of the tallest point on the vehicle. Then add at least 12 inches to both dimensions. That's your minimum comfortable clearance.
For reference: the average full-size pickup truck sits somewhere between 6'2" and 6'9" tall in stock form. A lifted truck can be considerably more. That 7-foot door your garage came with leaves very little margin. An 8-foot door is the practical minimum for most truck owners in 2026, and many people are sizing up to 8'6" or 9' when they're making a change anyway.
The standard sizes (and what they're actually based on)
Here's what "standard" means in practice:
Single-car doors: The most common residential single door sizes are 8×7 (eight feet wide, seven feet tall) and 9×7. These were designed around compact sedans from the mid-twentieth century. They're fine for a small car. For anything wider than a mid-size sedan, the 9-foot width is significantly better - you can actually open your door without immediately hitting the frame.
A 9×8 is the right call for most modern vehicles, including crossovers and standard SUVs. It's not exotic or custom - most manufacturers stock it.
Double-car doors: The standard is 16×7. It fits two compact cars side by side. For two modern vehicles - especially if either is a truck, a full-size SUV, or anything wider than a mid-size sedan - 16×8 is more practical, and 18×7 or 18×8 gives you genuinely comfortable two-car parking with room to open doors without gymnastics.
The rough opening for a standard 16×7 door is 16'3" wide and 7'1.5" tall - those extra inches account for the track and frame. This matters when you're measuring an existing opening.
Height options: Heights come in 7', 8', 9', and 10' for residential applications, with 10' and beyond available by special order. The shift from 7' to 8' is the one that affects the most people right now because of vehicle height trends. It's also the one most homeowners don't budget for until they're already dealing with the problem.
The measurements you actually need before you order
A lot of people measure only the opening width and height. That's not enough. Four measurements matter, and getting all four wrong or missing one can mean the door physically can't be installed properly.
Opening width - measured inside the frame, from jamb to jamb, at the widest point. Measure at floor level and at the top. If they differ, use the smaller number.
Opening height - measured from the floor to the underside of the header. The header is the horizontal beam sitting above the opening. This is your maximum door height - you cannot order a door taller than this clearance.
Headroom - the space between the top of the opening and your ceiling or the nearest obstruction. You need at minimum 10 to 12 inches of headroom for standard torsion spring hardware. If you want an opener, add several more inches for the rail. Low-ceiling garages exist, and there are low-headroom hardware configurations available, but you have to know you need them before you order.
Side room - the wall space on either side of the door opening. You need roughly 3.75 inches of clearance on each side for the vertical track. If you have a structural column or a utility line running right up against the door frame, this is where it becomes a problem.
Miss any of these and the installation crew shows up with a door that can't be hung. That's an expensive situation that's completely avoidable.
Trucks, SUVs, and vehicles that don't fit standard assumptions
Current vehicle heights are notably taller than they were when most residential garage door standards were set. A few specifics worth knowing:
Most stock pickup trucks - F-150, Silverado, Ram - run between 6'2" and 6'7" tall. With aftermarket lift kits, 7' and taller is common. A 7-foot door leaves somewhere between zero and five inches of clearance on a stock truck. That's not a comfortable margin.
For any pickup truck, the minimum practical door height is 8 feet. If you're lifted, going to 9 feet is worth the price premium. The cost difference between a 7' and 8' door is usually a few hundred dollars. Discovering after the fact that you can't fit your new truck in your garage is a much more expensive problem to solve.
Tall SUVs - Chevy Suburban, Ford Expedition, Land Rover Defender with a roof rack - often clear 6' with accessories. Same logic applies. 8-foot door as a minimum, 8'6" or 9' if you're thinking ahead.
RVs, boats, and oversized vehicles
Standard residential doors won't cut it here. RV door sizing is its own category.
Class A motorhomes run between 10 and 13 feet tall. With rooftop air conditioning units, antennas, and solar panels, add another 12 to 18 inches to that number. The standard starting point for RV garage doors is 14 feet tall and 12 feet wide, and that's before you account for specific vehicle dimensions.
A critical detail that trips people up: measure your RV fully loaded and fully extended. Suspension compression can change height slightly. Antennas fully extended, A/C units on top - measure what actually needs to clear the door, not what the vehicle's base dimensions say in the brochure.
Boats on trailers have their own clearance quirks. The trailer coupler height and the angle of the boat when loaded both matter. Measure the highest point on the boat when it's sitting on the trailer, not just the boat itself.
For anything in this category, a conversation with a professional installer before you order is genuinely useful. Custom sizing in this range costs 20 to 50% more than standard and has longer lead times - typically two to four weeks. Worth planning for.
Single door vs. two single doors for a two-car garage
This comes up more than people expect.
A single 16-foot double door is the default. It's cheaper - one door, one opener, one installation. But if one side fails, neither car can get out. The single door also means one large panel is handling wind load, which matters in storm-prone areas.
Two 9-foot single doors costs more upfront - two doors, two openers, two installations. But each car has independent access. If one opener fails, the other still works. Better energy efficiency because the seal between two separate doors is typically tighter than a single large panel. Many architectural styles also look better with two doors than one wide door - it's a visual balance question.
The practical tiebreaker: if you park cars with different schedules (one leaves early, one doesn't), two doors is genuinely useful day to day. If both cars move together most of the time, the single double door is fine.
Quick reference measurements
|
Door Type |
Common Sizes |
Good For |
|
Single / small car |
8×7, 8×8 |
Compact cars, storage, golf carts |
|
Single / standard |
9×7, 9×8 |
Sedans, crossovers, compact SUVs |
|
Single / truck |
10×8, 10×9 |
Full-size pickups, large SUVs |
|
Double / standard |
16×7, 16×8 |
Two compact or mid-size cars |
|
Double / modern |
18×7, 18×8 |
Two full-size vehicles |
|
RV / oversized |
12–14 wide × 14–16 tall |
Class A/B RVs, boats on trailer |
One thing worth doing before you commit
If you're replacing an existing door and think you might want to change the size, get a professional measurement done before you order anything. Most garage door companies will do this for free or very low cost, and catching a headroom issue or a structural limitation before you've ordered a specific door is dramatically better than catching it during installation.
Measure twice. Order once. It's the oldest advice in the trades and it applies here more than most people realize until they're standing in their garage with a door that doesn't fit.
DoorFixy can handle sizing, measurements, and installation - and flag problems with your existing opening before they become your problem on delivery day.
