Custom Home Cost Calculator
Wondering what it costs to build a custom home in Frankfort, IL or the southwest Chicago suburbs? Our free custom home budget calculator gives you a realistic price range in minutes. Enter your living area square footage, choose your finish level, and add the features you want — a finished basement, extra bathrooms, a porch, a walkout — and we’ll estimate your all-in build cost based on current 2026 Keen Construction pricing.
How Much Does It Cost to Build a Custom Home in 2026?
Custom home construction in our area typically runs from about $235 to $325 per square foot, depending on finish level and site conditions:
- Entry-level custom: $235 / sq ft
- Mid-range custom: $270 / sq ft
- High-end custom: $325 / sq ft
Each all-in price includes a finished or unfinished basement, a 3-car garage, and 2 full / 1 half bath. Upgrade options like a luxury primary bath, chef’s kitchen, masonry exterior, premium windows, and a walkout lot are factored into your estimate automatically.
