Amberline

The City of Boston requires permits through the Inspectional Services Department for any window or door replacement involving a change to the opening size, structural framing, or egress configuration. Like-for-like sash replacements in the existing opening usually don't need a permit but do still need to meet current egress code. Properties in Boston's historic districts (Back Bay, Beacon Hill, South End, Bay Village) need Boston Landmarks Commission review for any visible exterior change — sash material, profile, muntin pattern, and glass type all come under review.

Window-and-door costs in Boston run at the top of the MA market because of building access, parking constraints, union labor, and the prevalence of historic-district compliance work. Standard vinyl replacement windows typically run $700–$1,200 installed per opening; wood or composite windows for historic-compatible installs are $1,500–$3,500 per opening. Entry door replacement is typically $2,500–$6,000 installed depending on material. Sash-only restoration in landmarked districts can range widely — $1,200–$3,000 per opening — because most of the cost is skilled wood work, not the product itself.

Massachusetts requires a written contract and a Home Improvement Contractor registration for most residential window & door installation work; ask for the registration number and check it before paying a deposit.

More on permits, costs, rebates and common questions, plus every other window & door installation contractor serving the town, on the Windows & Doors in Boston page.