Licensed & insured general contractor · Chicago · Since 1999
☎ (773) 969-9097·bofranbuilders@gmail.com
Get an instant, Chicago-specific ballpark for your project. Choose your addition type, set the square footage, and pick a finish level — your estimated cost range and potential added home value update in real time. You can also open the full home addition cost calculator with every option explained.
Estimates are planning ranges based on 2025–2026 Chicago-area pricing and your inputs — actual cost depends on design, site conditions, materials, permits ($500–$5,000) and finish selections. New foundation work typically adds $20–$40/sq ft. For a firm, itemized number, request a free on-site estimate.
Like your number? Get it in writing — a line-item estimate from a licensed Chicago contractor, free.