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Replacing windows or doors in the same openings generally doesn't require a permit in Massachusetts, and Fairhaven follows that rule. Permits apply when you change structure — enlarging openings, adding windows, or putting in egress windows. Two local notes: Fairhaven has a notable stock of historic buildings, so exterior changes on protected properties may need extra review, and shoreline work can draw Conservation Commission interest. Check with the Fairhaven building department before ordering, particularly near the historic center.

Window and door costs in Fairhaven fall in the moderate South Coast range, generally below Boston metro pricing. Standard double-hung replacements typically run $550–$1,100 each installed; full-frame replacement on the town's older homes runs higher because of plaster, knob-and-tube, or rotted sills behind the trim. Insulated entry doors commonly run $1,800–$4,000 installed, with coastal-rated options higher. The biggest cost driver here is the age of the house — original Victorian and early-1900s openings rarely match modern stock sizes.

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 Fairhaven page.