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State research · updated July 2026

Replacement Windows in Massachusetts

Current incentive status, energy-code requirements, and local market research for Massachusetts homeowners replacing windows and doors.

Rebates & incentives

The federal window tax credit (25C) ended for projects placed in service after December 31, 2025. If your windows were installed in 2025, you can still claim it on your 2025 return — but for new projects there is no federal window credit. State and utility programs are now the main source of window incentives.

Massachusetts' Department of Energy Resources (DOER) is delivering IRA Home Energy Rebates through the existing Mass Save infrastructure rather than as a separate application, with funds prioritized for income-eligible households. As of mid-2026 the rebates had not fully launched for general homeowner applications. Confirm current status through Mass Save.

  • Mass Save. The statewide flagship efficiency program, funded by Massachusetts utilities. Mass Save currently offers a per-window rebate (around $75 per window) — but only for replacing single-pane windows with ENERGY STAR Most Efficient certified windows, and required air sealing or insulation work may need to be completed first. Double-pane replacements do not qualify. Confirm current terms before promising savings. (MassSave.com windows rebate page)
  • Mass Save HEAT Loan. Zero-interest financing through participating lenders for qualifying efficiency improvements identified in a no-cost Mass Save home energy assessment; qualifying window replacement can be financed this way. Confirm current terms and eligibility. (MassSave.com HEAT Loan pages)

Energy code

Massachusetts layers a base energy code (built on recent IECC editions) with a stretch code adopted by most municipalities and an opt-in specialized code — so permitted window replacements in much of the state must meet stringent low U-factor requirements suited to cold winters.

Local market research in Massachusetts