How Much Does It Cost to Build an ADU in 2026?
In Cambridge and across Greater Boston, a new detached ADU typically costs about $250,000 to $400,000+, while an internal conversion like a basement, attic, or garage usually lands closer to $100,000 to $250,000. If you're asking how much does it cost to build an ADU, the short answer is that the type of unit drives […]