Glenhead Garage in Coylton, South Ayrshire, is seeking permission to nearly double the size of its existing shop.
The extension would include a storage area and an accessible toilet, leaving more of the original building as a service area for customers and stock.
The petrol station has six pumps, as well as other facilities including air and a vacuum system, but only alterations to the store are proposed.
A decision on the plans is expected in the coming months.