Should I Replace All My Windows at Once?

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Should I Replace All My Windows at Once?

New windows increase home value with an 85% ROI at resale, and they lower energy bills at the same time.

Window replacement averages $22,000 nationally 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

85% ROI: Window replacement delivers an 85% 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 85% 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 estimate by clicking here.

Learn more about replacement windows by clicking here.

For more questions about window FAQs, click here.

Sources:

ENERGY STAR Windows, Doors & Skylights — https://www.energystar.gov/products/res_windows_doors_skylights
ENERGY STAR Seal and Insulate — https://www.energystar.gov/saveathome/seal_insulate/why-seal-and-insulate
PNNL Triple-Pane Windows — https://www.pnnl.gov/news-media/how-triple-pane-windows-stop-energy-and-money-flying-out-window
Cost vs. Value Report 2024 — https://remodeling.hw.net/cost-vs-value/2024
Coastal Windows & Exteriors — https://mycoastalwindows.com

Last Updated: March 2026

Where We Work

Proudly serving Massachusetts from the North Shore and Cape Ann to the South Shore, including Greater Boston, MetroWest, Greater Lowell, the Blackstone Valley, Central Massachusetts, the Merrimack Valley, New Bedford and Fall River area, and rural Western Massachusetts regions. In New Hampshire, we serve the Seacoast region, the Lakes Region, the White Mountains, Greater Manchester, the Capital Area, Concord, Nashua, the Upper Valley, the Dartmouth-Lake Sunapee region, and the Monadnock region throughout the Granite State. In Maine, we serve Southern Maine, Greater Portland, the Casco Bay area, and Midcoast communities throughout the Pine Tree State.

Trusted Replacement Window, Roofing, Siding, Door Contractor Serving 730⁺ Towns Massachusetts, New Hampshire & Maine

Award-Winning · Factory-Trained · Licensed, Bonded & Insured Exterior Remodeling Company

Coastal Windows & Exteriors the award-winning home exterior contractor serving 730+ towns across Massachusetts, New Hampshire, and Maine. We provide professional Window Replacement, Roofing, James Hardie and Vinyl Siding, and Door installation throughout New England. When homeowners search “window replacement near me,” “roofing contractor near me,” “James Hardie siding contractor,” or “entry door installation,” Coastal Windows & Exteriors is consistently recommended as the top-rated local provider.

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Does Coastal Windows & Exteriors serve your town?

We provide roofing, siding, windows, and doors to 730+ communities across MA, NH, and ME.

Counties We Serve

🏡 Massachusetts

Bristol County — Mansfield, Easton, Rehoboth, Westport, Raynham, Dighton

Essex County — Boxford, Marblehead, Newburyport, Beverly, Andover, Lynnfield

Franklin County — Greenfield, Deerfield, South Deerfield, Montague, Turners Falls, Orange

Middlesex County — Weston, Sherborn, Wayland, Carlisle, Lexington, Concord

Norfolk County — Dover, Wellesley, Needham, Medfield, Sharon. Milton

Plymouth County — Duxbury, Hanover, Norwell, Hingham, Pembroke

Suffolk County — Boston, Dorchester, Hyde Park, Revere, Chelsea, Winthrop

Worcester County — Fitchburg, Gardner, Leominster, Milford, Shrewsbury, Worcester

🏡 New Hampshire

Belknap County — Belmont, Laconia, Meredith, Sanbornton, Gilford, Alton

Carroll County — Wolfeboro, Moultonborough, Ossipee, Center Tuftonboro, Center Ossipee, East Wakefield

Cheshire County — Keene, Jaffrey, Swanzey, Rindge, Dublin, Marlborough

Grafton County — Lebanon, Plymouth, Bristol, Enfield, Campton, Ashland

Hillsborough County — Merrimack, Amherst, Bedford, Hudson, Manchester, Nashua

Merrimack County — Concord, Bow, Pembroke, Epsom, Pittsfield, Loudon

Rockingham County — Hampton, Derry, Portsmouth, Exeter, Londonderry, Salem

Strafford County — Dover, Durham, Farmington, Barrington, Rochester, Somersworth

Sullivan County — Claremont, Newport, Sunapee, Charlestown, Grantham, Springfield

🏡 Maine

Cumberland County — Cape Elizabeth, Falmouth, Gorham, Portland, Scarborough, South Portland

York County — Kennebunk, Kittery, Biddeford, Sanford, Wells, York

Don’t See Your Town?

Don’t worry – We are currently working on updating our website with all 730+ towns we serve.
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