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The Town of Brookline requires a permit through the Building Department for any window or door replacement that changes the opening size, structural framing, or egress configuration. Like-for-like sash replacements typically don't need a permit but must meet current egress code. Brookline has multiple local historic districts (Cottage Farm, Pill Hill, parts of Coolidge Corner) where exterior changes — including visible window replacements — need Preservation Commission review. Material, profile, and muntin pattern are scrutinized.

Window-and-door costs in Brookline track the top of the inner Boston metro market because of building density, condo coordination overhead, and the prevalence of historic-compatible work. Standard vinyl replacement (where allowed) is typically $800–$1,300 installed per opening; wood or composite for historic-compatible installs are $1,800–$4,000 per opening. Entry door replacement is typically $3,000–$7,000 installed. Pre-war brick condo work often runs higher per opening because of the specialized installation in masonry openings.

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 Brookline page.