In parking structure design, short span describes a framing layout with interior columns placed within the parking bays, typically between groups of stalls, rather than clear-spanning from one side of the parking module to the other.
The alternative, long span, carries the floor across the full width of a parking module with no interior columns. For a 90-degree layout that module is typically about 60 feet: two 18-foot stalls and a 24-foot drive aisle. Short-span grids typically place columns about every 3 stalls, roughly 27 feet apart, and are common where a garage sits under another building whose column grid it must follow.
Short span vs long span
- Short span: smaller beams and thinner floors; can lower structural cost; columns obstruct door swings, visibility and future layout changes.
- Long span: open, brighter floors that feel safer and are easier to restripe; most stand-alone U.S. garages are long span, often precast double tees or post-tensioned beams.
The Parkonomics view
Column-free floors are worth more than they cost in most stand-alone garages: easier parking, better sight lines, and the flexibility to restripe for larger vehicles or convert floors to other uses. Short span makes sense when the building above dictates the grid. Elsewhere, price the long-span option before accepting columns in the stalls.
Related terms: Parking Geometry, Long Span Construction, Precast Pretensioned Concrete, Post-Tensioned Concrete, Adaptive Reuse
Further reading: The Evolution of U.S. Parking Structures in 2026