Basement Remodeling Cost Calculator
Planning a basement finishing project in Frankfort, IL or the southwest Chicago suburbs? Use our free basement remodel cost calculator to get a realistic ballpark estimate in about two minutes. Answer a few quick questions about your basement size, finish level, and must-have features, and we’ll show an estimated price range based on real 2026 Keen Construction pricing — no email required to see your number.
What Does It Cost to Finish a Basement in 2026?
Basement finishing in the Chicago suburbs typically runs from the mid-$30,000s for a small, straightforward finish up to $105,000+ for a large, fully finished basement with bathrooms and custom features. Here’s how our estimates break down by size:
- Under 500 sq ft: $35,000 – $45,000
- 500–799 sq ft: $42,000 – $56,000
- 800–1,199 sq ft: $50,000 – $72,000
- 1,200–1,599 sq ft: $65,000 – $92,000
- 1,600+ sq ft: $85,000 – $105,000
Finish level, bathrooms, egress windows, kitchens, and walkout access all adjust the final number — the calculator accounts for each automatically.
