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The rate for 4 ft foundation walls varies anywhere from $10 to $18 per foot, though depending in your state, area, number of companies that do this type of work the rate may be much higher or lower. At $10/ft for a 30ftx40ft structure, the foundation wall will cost $1,500-$1,800.
The budget will also include material and labor costs associated with building forms for the concrete, casting the footers and stem wall, and pouring and finishing the slab. At the time of publication, the cost of a typical slab foundation for a home between 1,600 and 1,800 square feet ranges between $7,000 and $16,000. A perimeter foundation consists of a perimeter stem wall resting on below-grade footings; the walls and floor of the structure rest on the stem wall.