How much does it cost to pour a 1500 sq ft basement? House Foundation Cost Calculator Square Feet Concrete Slab Basement (Unfinished) 1,000 $5,750 – $13,520 $33,506 1,200 $6,936 – $16,224 $40,239 1,500 $8,670 – $20,280 $50,299 2,400 $13,872 – Read more…