Tandem parking is an arrangement in which two or more vehicles park in a line, one behind the other, so the inner vehicle can leave only after the outer one moves.
A tandem stall is roughly twice the depth of a standard stall and is served by a single drive aisle. Because the inner car needs no aisle of its own, tandem layouts fit more vehicles onto narrow lots, shallow garages, and residential driveways than side by side parking can. The cost is access: every tandem pair has a car that can be blocked.
Where tandem works
- Assigned residential parking. When both stalls belong to the same household, the people who block each other also live together and can coordinate.
- Valet and attendant operations. Staff hold the keys and move cars as needed, so blocking becomes a labor question rather than a customer complaint. See attendant parking.
- Designated employee parking. Known schedules make it possible to pair early and late shifts.
Zoning codes usually encode exactly these conditions. Eureka, California, for example, permits tandem spaces for residential uses only when both are assigned to a single dwelling unit, and for non-residential uses only as employee parking.
Where tandem fails
Tandem breaks down in self-park, transient, and retail settings, where the driver who is blocked has no way to find the driver who is blocking. Each conflict turns into a call to the office, a wait, or a tow. A tandem pair drawn as two spaces on a site plan can behave like something closer to one and a half spaces in a self-park operation.
The Parkonomics view
Tandem is an operating and pricing decision before it is a design decision. In a valet program, a tandem row can be the cheapest capacity a facility will ever add. In an unassigned self-park garage, it is a staffing cost disguised as a space count. As cities reduce or remove parking minimums (California’s AB 2097 is one example), the question shifts from what counts toward a requirement to what a tenant or customer will actually pay for, and tandem stalls should be priced and assigned with that in mind.
Related terms: Attendant Parking, Stack Parking, AB 2097
Further reading: The Evolution of U.S. Parking Structures in 2026