What is the size of a parking lot stall?

As a general rule of thumb, the width of a parking lot stall varies according to the amount of stall turnover (examples given in parentheses).

COMMUTER PARKING LOT AT SHEA STADIUM, QUEENS. (FROM THE SITES EXHIBITION. FOR OTHER IMAGES IN THIS ASSIGNMENT, SEE FICHE NUMBERS 123, 124, 198, 199.)
Image source: Wikimedia Commons

Turnover

This extra width is needed when lots of folks are using the stalls. Some agencies use a standard 9’ width for all spaces. Stall length is typically 18’ 0” for spaces at 90°, but will vary at different angles and widths. Aisle width at 90° is 23’, but again will vary with different angles. Narrow stalls (7’ 6” wide) are sometimes used in tight areas or when there are subcompact cars.

There are requirements for handicap stalls that also need to be followed (see link below).
2010 ADA Standards for Accessible Design (PDF)

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