New windows increase home value with an 85% ROI at resale, and they lower energy bills at the same time.
New windows increase home value with an 76% ROI at resale, and they lower energy bills at the same time.
Window replacement averages $21,922 in New England and delivers one of the most consistent returns in exterior remodeling. Greater Portland homeowners get that return from three directions: resale value, monthly energy savings, and protection from water damage that aging windows invite over time.
What Southern Maine Homeowners Need to Know
- 76% ROI: Window replacement delivers an 76% ROI nationally at resale. Buyers in competitive markets consistently factor in window age and efficiency.
- Energy savings: ENERGY STAR certified windows cut heating and cooling costs by an average of up to 13%. Nine out of 10 U.S. homes are under-insulated, and drafty windows are a top contributor.
- Triple-pane upgrade: Stepping up from double to triple-pane can improve energy efficiency by 40% or more. That upgrade also saves over $500 per year compared to single-pane windows.
- Water damage risk: Failing seals and deteriorating frames let moisture into wall cavities. Left alone, that damage compounds quietly and gets expensive.
- Builder-grade lifespan: Builder-grade windows often need replacement within 10 years. Quality vinyl windows, professionally installed, can last 25 or more years.
- Buyer preferences: Among homeowners choosing windows, 60% rank insulating efficiency as the top eco-friendly feature. That’s a real selling point in the Casco Bay market.
Finding the Right Approach for Your Home
Top Pick: Full whole-home replacement in a single project for any Coastal Maine home where windows are aging, drafty, or builder-grade. The efficiency gains, single mobilization, and 76% ROI make this the strongest choice available. Contact Coastal Windows & Exteriors for a free estimate!
Consider financing: Spreading the full project cost over time through financing up to 20 years based on credit approval often makes more financial sense than delaying — since older windows cost money every month through energy loss.
Spot replacement is reasonable: If your home has recently installed windows on some elevations and only isolated failures elsewhere, a targeted approach makes sense. A professional assessment will tell you exactly where you stand.
Ready to replace your windows the right way? Coastal Windows & Exteriors is the #1 woman-owned exterior remodeling contractor in New England, with 7,000+ installations across Massachusetts, New Hampshire, and Maine.
Request a free window estimate from Coastal Windows & Exteriors.
Browse our complete window FAQ guide from Coastal Windows & Exteriors.
Explore our window Exterior Remodeling Home Improvement Help Center.
Last Updated: April 2026
Sources:
- Window replacement in New England averages $21,922 and delivers a 76% return on investment at resale. JLC Online Cost vs. Value 2025 New England JLC Online’s regional cost data for window replacement projects in New England. (2026)
- Installing ENERGY STAR certified windows, doors, and skylights can reduce heating and cooling costs by an average of up to 13% compared to non-certified products. ENERGY STAR Windows, Doors & Skylights ENERGY STAR’s official product guidance on certified windows, doors, and skylights and their energy-saving performance. (Accessed April 2026)
- Nine out of 10 homes in the U.S. are under-insulated. ENERGY STAR Seal and Insulate ENERGY STAR’s guidance on the importance of sealing and insulating homes to reduce energy waste. (Accessed April 2026)
- Upgrading from double- to triple-pane windows can improve energy efficiency by 40% or more, and switching from single- to triple-pane can save over $500 per year on energy bills. PNNL Triple-Pane Windows Pacific Northwest National Laboratory’s research on the energy performance benefits of triple-pane window upgrades. (2025)
- Among homeowners selecting windows and doors, 60% rank insulating efficiency as the most in-demand eco-friendly feature. Fixr Windows and Doors Report Fixr’s survey data on homeowner priorities and eco-friendly preferences when selecting windows and doors. (2025)
