Foundations

Type of Foundation Relative Cost Comments
Slab-On-Grade

A concrete slab on the surface of the land.
Construction - 1
Maintenance - 3
Useful Life - 10
Requires special attention to under floor util., insulation, drainage and flood control.
Crawl Space Construction - 3
Maintenance - 3
Useful Life - 10
Requires special attention to drainage, flood and rodent control.
Most codes require an 18" minimum "head-room" but in order for a crawl space to be accessible for maintenance and ventilation more clearance is essential.
Basement Construction - 8
Maintenance - 3
Useful Life - 10
Basements are a relatively expensive space with relatively low usage value. They maybe a good investment for some storm shelter application.

For more information See: Basements and Crawl Spaces