Every parking lot is a set of rectangles that has to satisfy three masters at once: the zoning code that says how many spaces you owe, the ADA Standards that say how many of them must be accessible and how big, and the drivers who need to get in and out without trading paint. This guide gives you the standard dimensions for each piece, where the numbers come from, and the one thing most layout guides leave out, which is where the wheel stops go once the lines are down.
Two things before the tables. First, there is no single national parking stall dimension. The 9-by-18 stall is the most common figure in US codes, but your city's zoning ordinance is the number that governs your permit, and cities vary by a foot or more. Second, the ADA figures are federal law and do not vary. Use the local code for the lot and the federal standard for the accessible spaces, and where they conflict, the stricter one wins.
Standard parking space dimensions
| Space type | Width | Depth | Notes |
|---|---|---|---|
| Standard (most codes) | 9 ft | 18 ft | The default in the majority of US zoning ordinances |
| Standard (narrow) | 8.5 ft | 18 ft | Allowed by many codes for low-turnover or employee lots |
| Standard (generous) | 9.5 to 10 ft | 18 to 20 ft | Retail and grocery, where doors open wide and carts move |
| Compact | 8 ft | 16 ft | Usually capped at a percentage of total spaces, and must be signed |
| Compact (tight) | 7.5 ft | 15 ft | The minimum in some codes, such as Raleigh's |
| Parallel | 8 to 9 ft | 22 to 24 ft | The extra length is maneuvering room |
| ADA car space | 8 ft (96 in) | Same as adjacent stalls | Plus a 5-ft access aisle, see below |
| ADA van space | 11 ft (132 in) | Same as adjacent stalls | Plus a 5-ft aisle, or 8 ft wide with an 8-ft aisle |
Stall lines are 4 inches wide, and the stall width is measured centerline to centerline of the stripe. A lot laid out to 9-foot stalls and painted with 4-inch lines gives the driver 8 feet 8 inches of clear pavement between the paint.
The width debate is really a turnover question. An 8.5-foot stall works in an office lot where cars park once and leave once. A retail lot where doors swing open beside loaded carts wants 9 feet or more. Some codes set the stall width by use for exactly this reason.
Drive aisle width by parking angle
The aisle is the lane cars use to reach the stalls. Its width depends on the parking angle and whether traffic runs one way or two.
| Parking angle | Traffic | Aisle width | Typical module (stall + aisle + stall) |
|---|---|---|---|
| 90 degrees | Two-way | 24 ft (codes allow 22 to 26) | About 60 ft |
| 60 degrees | One-way | 16 to 18 ft | About 56 to 58 ft |
| 45 degrees | One-way | 12 to 14 ft | About 50 to 52 ft |
| 30 degrees | One-way | 11 to 12 ft | About 46 to 48 ft |
| Parallel | Two-way | 20 to 24 ft | Depends on street or lot width |
The module is the number that decides how many rows fit across a lot. At 90 degrees, a double row of 18-foot stalls with a 24-foot aisle takes 60 feet. Angled parking shrinks the aisle but stretches the stall's projected depth, so the module does not shrink as much as the aisle suggests.
Ninety-degree parking fits the most cars per acre and handles two-way traffic. Angled parking is easier to enter and leave, needs narrower aisles, and forces one-way circulation, which is often the point in a busy retail lot. Plan on roughly 300 to 350 square feet per space at 90 degrees once you count the aisle and the end islands, and more at angles.
Fire lanes and circulation
Fire access lanes are separate from parking aisles and governed by the fire code, not zoning. The International Fire Code calls for a minimum unobstructed width of 20 feet and a vertical clearance of 13 feet 6 inches, and the local fire marshal decides where those lanes run. Nothing gets parked, striped, or set in a fire lane, including wheel stops.
End islands at the head of each row protect the last car from turning traffic and give the row a place for a light pole, a sign, or a tree. Keep the inside turning radius at the end of a row at 15 feet or more for passenger cars, and more if delivery trucks use the aisle.
ADA accessible parking: how many, and how big
The 2010 ADA Standards for Accessible Design set both the count and the dimensions. The count is in Table 208.2 and scales with the total number of spaces in the lot.
| Total spaces in the lot | Minimum accessible spaces |
|---|---|
| 1 to 25 | 1 |
| 26 to 50 | 2 |
| 51 to 75 | 3 |
| 76 to 100 | 4 |
| 101 to 150 | 5 |
| 151 to 200 | 6 |
| 201 to 300 | 7 |
| 301 to 400 | 8 |
| 401 to 500 | 9 |
| 501 to 1,000 | 2 percent of total |
| 1,001 and up | 20, plus 1 for each 100 over 1,000 |
At least one in every six accessible spaces, and never fewer than one, must be van accessible. Medical facilities have higher ratios.
The dimensions come from Section 502:
- Car space: 96 inches (8 feet) wide minimum, with an adjacent access aisle at least 60 inches (5 feet) wide.
- Van space: 132 inches (11 feet) wide with a 60-inch aisle, or 96 inches wide with a 96-inch aisle. Either way the combined width is 16 feet.
- Access aisle: runs the full length of the space, is marked so it will not be parked in, and connects to an accessible route. Two spaces may share one aisle.
- Slope: the space and aisle cannot exceed 1:48 (about 2 percent) in any direction.
- Vertical clearance: 98 inches for van spaces and the route to them.
- Signage: a sign with the International Symbol of Accessibility, mounted at least 60 inches to the bottom edge, and a "van accessible" designation where that applies.
Accessible spaces go on the shortest accessible route to the entrance, dispersed among entrances when there is more than one. A parking lot that meets every local dimension and misses the ADA count is the most common way a new lot fails its final inspection. For the California layer on top of federal, which adds requirements of its own, see our guide to ADA wheel stop requirements in California.
Where the wheel stops go
Most layout guides stop at the striping. The wheel stop is the piece that keeps the layout working after the paint dries, because a car does not stop at the end of the stall. The front of a passenger vehicle overhangs the front wheels by 2 to 3 feet. Without a stop or a curb, that overhang lands on the sidewalk, in the planter, against the building, or in the nose of the car parked across the module.
Where you need them. Not every stall. Put a stop wherever a vehicle could over-travel into something that matters: stalls facing a walkway, a building wall, landscaping, a light pole, a charging pedestal, a drainage swale, or a facing row without a curb between. Our wheel stop quantity guide walks through counting them for a quote.
Setback from the head of the stall. Set the face of the stop 2 to 3 feet back from the front line of the stall, so the bumper overhang stops short of whatever is in front. If the stall faces a sidewalk that has to keep a 36-inch clear route (the ADA minimum for an accessible route), measure the overhang against the walkway width, not the curb. A stop set too close to the curb lets the car hang over the walk and can fail an accessibility review. A stop set too far back wastes stall depth and lets the car hang into the aisle.
Length. Match the stop to the stall.
| Stall | Stop length | APC model |
|---|---|---|
| 9-ft standard | 6 ft | CB06 |
| 8-ft compact, or a tight stall beside a column | 4 ft | CB04 |
| 10-ft stall, or where two stalls share one stop line | 8 ft | CB08 |
| Truck and dock stalls | Heavy-duty truck stop | TB Series |
A 6-foot stop in a 9-foot stall leaves 18 inches of clearance on each side, which keeps the stop under the wheels and out of the door swing. Sizes and weights for each model are on the concrete parking stops page.
Accessible spaces. A wheel stop can be used in an accessible space, but it stays inside the stall and never crosses into the access aisle. The aisle has to stay clear for a lift or a wheelchair. Where a stop is used to keep overhang off a walkway, many designers use a stop in the stall and a curb ramp or level landing at the walk rather than relying on the stop alone.
Anchoring. Weight does not hold a wheel stop in place; anchoring does. Precast concrete stops are pinned to the pavement with steel rebar through cast-in holes, or set in epoxy where drilling is not practical. Details are in the installation guide.
Truck, loading dock, and fleet stalls
Trucks change every number above.
| Vehicle | Stall width | Stall length | Apron or maneuvering depth |
|---|---|---|---|
| Semi with 53-ft trailer | 12 to 14 ft | 70 to 75 ft | 120 to 130 ft off the dock face |
| Straight truck or box van | 12 ft | 35 to 45 ft | 60 to 80 ft |
| Pickup and van fleet | 10 ft | 20 to 22 ft | 26 to 30 ft aisle |
Dock positions are usually 12 feet on center with the trailer backed square to the wall. The wheel stop at a dock is doing a different job than in a car lot: it takes a hit from a vehicle that weighs 30,000 pounds or more, backing blind. That is a heavy-duty truck stop, not a car stop, and it is anchored accordingly. Our guide to loading dock wheel stops covers the placement.
EV charging, motorcycle, and specialty stalls
An EV charging stall is a standard stall with a pedestal at its head. The stop keeps a bumper from finding the charger, and it sits where the cable reaches the port from either side. Codes increasingly require a percentage of stalls to be EV-capable, so plan the conduit before the paving, not after.
Motorcycle stalls are commonly 4 feet by 8 feet and can fill the odd corner a car stall will not. Bicycle parking is set by its own code section in most cities.
How to lay out a lot to standard dimensions
- Get the local numbers first. Pull the zoning ordinance for stall size, aisle width, the required space count for your use, the allowed percentage of compact stalls, and landscaping and setback rules. This is a one-page table in most cities, and it is the table the plan checker will use.
- Fix the fire lanes and the entrances. They are not negotiable and they decide where the rows can go.
- Choose the angle. Ninety degrees for capacity and two-way flow. Sixty or forty-five for one-way circulation and easier parking in a busy lot.
- Divide the width by the module. A 180-foot-wide lot fits three 60-foot modules at 90 degrees. Whatever is left over becomes landscaping or a wider aisle, not a half-stall.
- Place the ADA spaces. Count from Table 208.2, one in six van accessible, on the shortest accessible route to the door. Check the slope.
- Mark the overhang line and the wheel stops. Everywhere a stall faces something a bumper could reach, decide whether a curb or a stop protects it, and set the stop line 2 to 3 feet off the head of the stall.
- Stripe, then set the stops. Stops go in after striping so they land centered in the stall. Anchor every one.
Frequently asked questions
What is the standard parking space size in the US? Nine feet wide by 18 feet deep is the most common. Many codes allow 8.5 feet wide, and some require 10 feet for retail. Your city's zoning ordinance is the number that counts.
How wide should a parking lot aisle be? 24 feet for two-way traffic with 90-degree stalls. One-way aisles serving angled stalls run 12 to 18 feet depending on the angle.
How many ADA spaces does a parking lot need? One for lots up to 25 spaces, two up to 50, three up to 75, four up to 100, then one more for each 50 spaces up to 200, and one more per 100 up to 500. Above 500, 2 percent. One in six must be van accessible.
How far from the curb should a wheel stop be? The face of the stop is usually set 2 to 3 feet from the head of the stall so the vehicle's front overhang stops short of the walkway or landscaping. Measure it against the walkway's required clear width, and follow the site plan.
What size wheel stop for a standard stall? A 6-foot stop for a 9-foot stall. Four feet for compact stalls, 8 feet for wide stalls, and a heavy-duty truck stop for docks and fleet yards.
Do parking dimensions include the stripe? Stall width is measured to the centerline of the 4-inch stripe, so a 9-foot stall has 8 feet 8 inches of clear pavement between the lines.
Sources
- 2010 ADA Standards for Accessible Design, Sections 208 and 502 (parking spaces), US Access Board
- International Fire Code, Section 503 (fire apparatus access roads)
- Municipal zoning ordinances cited above: City of La Puente, City of Raleigh, City of Albuquerque, Village of Westmont. Confirm your own city's table before striping.