Still a bargain for what you are getting.īasement Floor: If you are not doing a “mud cap” slab in your crawl space then a 4” thick concrete slab in your basement is an added cost. Another consideration would be to add more height to the basement to allow for plumbing, ductwork, electrical and support beams to stay above the 8-foot mark. You will need an alignment system for the walls, and possibly a more detailed reinforcing layout due to added backfill height. Walls: 4 foot high for crawl space and 8 foot high for a basement. As you can see, with some planning, your excavation cost difference should be minimalįootings: Cost for footings should be the same for a crawlspace or basement based on an average load bearing of the soil at 2000 psf (pounds per square foot). You can add more soil if you are too high but if you set your elevation too low you have to haul away the extra soil or add to your foundation height. Remember, the deeper the excavation the more soil you will have to backfill with. Using the same criteria as above, flat ground, an excavator would dig 5 to 6 feet for an 8-foot basement. This is often accomplished by elevating the basement high enough to have egress windows at grade level or by the use of window wells. Many of the new energy homes are incorporating the basement as everyday living space such as bedrooms and family rooms. If the grade falls away and allows for a walkout entry that is a plus. By under digging you will be able to backfill the foundation with the soil that came out of the hole, raising the grade just slightly so that water sheds away from the foundation.Įxcavating for a basement: Basement elevations can vary dramatically based on what the intended use and topography are. If a typical foundation would be approximately 4 feet high, and a typical basement is 8 feet high how much more would it cost?Įxcavating for a crawl space foundation: If the ground is flat, for instance, an excavator would dig about 2 to 2 1/2 feet of depth.
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