Checking whether a used car fits your garage

The short answer

A used car fits your garage only if it passes four checks. Its width and height must clear the garage door opening. Its length and width must fit the usable interior. It must be possible to drive it in along the actual approach. And there must be room left to open the doors, hatch or tailgate so people can get in and out. Answering this means comparing the exact car's dimensions with your own measurements in one unit. A "standard" garage size or a brochure figure cannot tell you, because garages vary and published vehicle dimensions do not always describe the car you are buying.

Forum threads and online calculators can show you what to think about, but they reflect other people's cars and garages. At least one popular online fit checker uses a preset garage size and asks you to replace it with your own measurements. When it could not confirm a model's mirror width, it used the listed body width instead, which means its result cannot settle mirror clearance. Treat any tool's output the same way. It is only as good as the numbers you put into it.

Why generic garage sizes don't settle it

Searching for a standard garage size in metres gives typical figures, not your garage. What you can actually park in is the clear space inside the walls. That is often smaller than the outside size of the building or the size on a plan. Wall thickness, framing, steps into the house, water heaters, shelving, workbenches and bins all take space from the parking area. One writer who planned his own garage made the same point. He sized it around how the vehicles would be used and the room actually left inside the walls, not the external footprint.

The door opening is a separate limit. A garage can be deep and wide inside and still have an entrance that is narrower or lower than the interior. Overhead door tracks, the door panel when raised, and the opener can reduce headroom just inside the entrance.

Get the dimensions of the exact car

Used cars make this harder because the same model name can cover different generations, body styles, wheelbases, trims and markets. Pin down the specific configuration before you look up any figures.

• Model year, generation and market. Dimensions can change between facelifts, and versions sold in different countries can differ.
• Body style and wheelbase. Sedan, hatchback, wagon, long-wheelbase and crew-cab versions differ in length.
• Width with and without mirrors. Manufacturers do not all state width the same way. Check whether the listed width includes the mirrors. If it doesn't, find the mirrors-out width, and note whether the mirrors fold.
• Height as equipped. Roof rails, a roof rack, a roof box, a raised or lowered suspension, or larger tyres can change the listed height. Measure the car itself if it has been modified.
• Opening space. Note how wide the doors swing and how high the tailgate or hatch rises when open, especially on SUVs and wagons parked under a low ceiling or opener rail.
• Accessories that add length. Tow bars, bike carriers and bull bars may not be included in the published length.

If you can see the car in person, measuring it directly is the most reliable check. This applies especially to mirror width, height with accessories, and how high the hatch rises.

Measure the garage

Write each measurement down with its unit, where you took it, and the date. A photo of the tape at each point helps you check later or share the figures with a seller.

Measurement	Where to take it	What it controls
Clear entrance width	Narrowest point of the door opening, including frame, weatherstrip and any door hardware	Whether the car's mirror-to-mirror width clears the opening
Clear entrance height	Lowest point under the raised door, track or opener	Whether the car's height, roof accessories and raised hatch clear the entrance
Usable interior length	From the inside of the closed door to the nearest obstruction on the back wall, such as steps, shelving or a water heater	Whether the car fits with the door closed
Usable interior width	Between the nearest obstructions on each side, not just wall to wall	Room to open doors and walk past
Ceiling and fixture height inside	Lowest point over the parking area, such as an opener rail, lights or beams	Whether the hatch or tailgate can open fully
Obstructions	Location and size of anything fixed in the parking area	Where the car can actually sit
Approach	Slope, kerb, ramp or turn at the entrance, and the driveway width	Whether the car can be driven in straight, and ground clearance at the threshold

Compare the numbers in one unit

Convert everything to one unit before comparing. Millimetres avoid decimals. For conversions, 1 inch is exactly 25.4 mm and 1 foot is exactly 304.8 mm. Then work through the checks in this order.

• 1. Entrance: compare the car's mirrors-out width with the clear entrance width, and its height as equipped with the clear entrance height.
• 2. Interior: compare the car's length with the usable interior length, and its width with the usable interior width.
• 3. Divide the leftover space: decide how much goes on each side and at each end, given where people need to walk and where storage sits.
• 4. Occupant access: check that the people who will use the car can open their doors far enough to get in and out, including anyone who needs a wide opening, a child seat or a wheelchair.
• 5. Openings and storage: check hatch or tailgate height against the ceiling and opener, and that cupboards or a side door to the house remain usable with the car parked.

A worked example

This is a hypothetical example to show the arithmetic, not a real car or garage. Suppose the clear entrance width is 2500 mm and the car's verified mirrors-out width is 2100 mm. That leaves 400 mm in total, or 200 mm on each side if the car is perfectly centred. Suppose the usable interior length is 5500 mm and the car is 4700 mm long. That leaves 800 mm to split between the front and back.

These figures describe the car standing still. They don't show whether you can steer through the entrance at an angle, whether the driver can open their door against a wall, or whether someone can walk past the bumper. Record those separately, ideally by test-parking the car or marking its outline on the garage floor with tape.

Choosing your next step

If the margins are comfortable on every check, the car is a reasonable candidate on size. If any margin is tight, measure the actual car and re-measure the garage at that point before committing. Folding mirrors, removing a roof rack or moving shelving may change the result. If several cars on your shortlist are borderline, add their mirrors-out width, height as equipped and length to the same sheet, so you compare them against identical garage figures rather than separate listings.