Window Replacement, Siding, Doors and Decks in Westford, MA

Permits

Permits for siding, windows and decks in Westford

What the town lists. The Building Department's "Permits Are Required" table names "Exterior Siding/Trim," "Windows – Doors," "Decks – New" and "Decks – Replacement/Repairs." Effective December 2023, deck replacements or repairs within the existing footprint can be filed on the online portal, with pictures of the existing deck, plans of existing and proposed, an insurance certificate naming the Town, a signed contract and engineer-stamped calculations for any engineered lumber; roof, window, door and siding permits are online as well (Building Department).

Plot plans and inspections. Per the same page, "any extension to the existing footprint of a building, such as an addition, porch, or deck require a plot plan" certified by a registered land surveyor, and an as-built plot plan is required before the final inspection. Inspections are done within 48 hours of the request, but only once the Job Card carries the signatures it needs, and the permit is closed out at the final inspection.

Fees. The Permit Fees page sets a $50 minimum for all building permits. Starting work before the permit is issued means a triple fee under the posted fee schedule, which carries an effective date of March 1, 2004; ask the Building Department for current amounts.

Permit table

Siding/trim, windows and doors, new decks, deck repairs

Online filing

Roof, window, door, siding; in-footprint deck repairs since December 2023

Deck or porch beyond the footprint

Surveyor-certified plot plan; as-built before final

Minimum permit fee

$50

Work started without a permit

Triple fee (schedule dated March 1, 2004)

Energy code

Stretch Code since July 1, 2014; Specialized Opt-in Code effective January 1, 2028

State rules for exterior contractors. The state's contractor chart, offered as general guidance, shows siding and window installation or replacement needing a building permit and at least a "Window/Siding" construction supervisor license, and decks, exterior stairs, structural carpentry and new door installations needing a permit and a supervisor license; a replacement door needs a permit "if an exit door or for public safety concerns" (HIC contractor resources). For an owner-occupied home of one to four units, the contractor must be registered as a Home Improvement Contractor (registration lookup). A contract for more than $1,000 must be written, with the registration number, start and completion dates, price and payment schedule; the deposit is limited to one-third unless special-order materials cost more; and a contract signed at home can be cancelled until midnight of the third business day (c.142A §2). If the homeowner pulls the permit, the Guaranty Fund, which can pay up to $25,000 of losses against a registered contractor, is off the table (HIC homeowner resources).

Energy code on the calendar. Westford has used the Stretch Code since July 1, 2014, and the state's list shows its Specialized Opt-in Code taking effect January 1, 2028 (energy code adoption by municipality). Replacement windows must meet the energy code's U-factor for new windows; ask your installer for the NFRC label.

Lead paint and cement siding. Westford posts no lead guidance, so state and federal rules apply. Paid work on a pre-1978 home that disturbs more than 20 square feet of exterior paint must be done by a licensed Lead-Safe Renovation Contractor (MA lead-safe renovation), and window replacement is always covered by the federal rule, regardless of square footage (EPA RRP). MassDEP considers cement or "transite" siding suspect asbestos: it may not be broken, sanded, sawed or drilled, removal is notified at least ten working days ahead, and a DLS-licensed inspector's survey is required unless an owner is doing the work on their own owner-occupied single-family home (MassDEP asbestos FAQ).

Last verified November 2026. Fees, restrictions and deadlines on this page are due for re-checking by November 2027. New England Exterior Pros is a referral service: we don't install anything, and the contractor you hire files the permits.

Decks and porches

Decks and porches in Westford

Setbacks by district. The town's Deck, Porch page lists front, side and rear setbacks of 50, 15 and 30 feet in Residence A, and 25, 15 and 30 feet in Residence B; corner lots have two fronts and two sides. Small accessory structures of 120 square feet or less need at least 10 feet from side and rear lines (2021 Zoning Bylaw, §3.5.2).

Septic clearances. The 2010–2015 open space plan says Westford has no public sewer (Open Space and Recreation Plan), and the deck checklist accounts for it: "structures should be 10 feet from septic tank and 20 feet from septic field," and "sono-tube type supports must be 5 feet from all septic system components." The checklist also asks you to check easements, show the deck on the plot plan, get Conservation approval within 100 feet of wetlands or a Riverfront Area, and submit a complete structural plan, which a contractor or architect may prepare; work starts only after every board and the Building Commissioner have signed and the permit is posted on site (Deck, Porch).

Wetland limits. Westford's wetland regulations, in effect since December 9, 2020, measure two lines from the resource area: a limit of work and a limit of building. For work on an existing artificial surface of a lot that already has a structure, those lines are 30 and 55 feet; for work on natural ground, or on an undeveloped lot, they are 50 and 75 feet (Wetland Rules and Regulations).

Footings and stairs. The town posts no frost depth. Massachusetts sets it at 48 inches and limits exterior stair risers to 8¼ inches with treads of at least 9 inches (780 CMR 51, chapter 3). Before footings are augered, Dig Safe must be notified at least 72 hours ahead, not counting weekends and legal holidays (c.82 §40A); call 811 (Dig Safe).