Home Addition, ADU, and Remodeling Guides for Worcester County, MA

Straight answers on what projects cost, what permits you need, and what Massachusetts law allows. Written by Andrew Mercurio, a fourth-generation builder working in Worcester County. Most homeowners start a project with the same handful of questions and get vague answers to all of them. These guides give you the real ones. What an addition actually costs in Central Massachusetts, what changed when the state legalized accessory dwelling units, when you need a permit and when you do not, and what to check on your property before you get attached to a plan. If you have a question these do not cover, call us at (774) 249-0221.

Massachusetts ADU Law: What You Can Build By Right

Massachusetts ADU Law: What You Can Build By Right

Massachusetts ADU Law: What You Can Build By RightAndrew Mercurio
Published on: 05/08/2026

Massachusetts allows one ADU by right on most single-family lots. Here is what the law permits.

Additions & ADUs