Supernova Construction Inc.

The Milford Building Department does not require a permit for a like-for-like window sash replacement in the same rough opening. Any change to opening size — enlarging for egress, converting a window to a door, or cutting in a new opening — requires a building permit. Milford has scenic streetscape and downtown standards that can come into play on the visible front elevations of older Italianate and Victorian homes; check with the Milford Historical Commission for homes within any designated area. Most of Milford's older stock predates 1978, putting the majority of jobs under federal RRP lead-paint rules — expect a $50–$150 per opening lead-safe surcharge.

Milford window pricing runs at the southern Worcester County average — generally a bit below inner Boston suburbs. Expect roughly $500–$1,000 per opening installed for a quality vinyl double-hung, $1,250–$2,800 per opening for wood or composite (Andersen 400, Marvin Elevate, Pella), and $1,800–$4,500 for an entry door with sidelights. Matched-profile wood replacements on Italianate or Victorian fronts run $1,500–$3,500 per opening. Patio sliders typically run $2,500–$5,000 installed.

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 Milford page.