A home addition in 2026 runs between $120 and $400 per square foot nationally, putting most projects in the $30,000 to $150,000 range depending on size and finish quality. That’s a big spread, and here’s why: the type of addition you choose matters more than anything else. A basic sunroom costs far less than a full second-story build-out, and a bathroom addition hits your wallet harder per square foot than a simple bedroom bump-out.
Key Takeaway: Expect to pay $120 to $400 per square foot for a home addition in 2026, with most projects falling between $30,000 and $150,000. Labor …




