how long do windows last?
Fifteen to fifty years, depending on what the frame is made of and how well the window was installed. Here is the honest range for New England, what fails first, and how to tell repair from replace.
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★★★★★5/5the short answer
Replacement windows last 15 to 40 years, and good ones longer. Vinyl runs 20 to 40 years for a quality unit and 15 to 25 for builder-grade. Fiberglass and composite run 30 to 50. Wood lasts 30 years and up, and nearly forever if it is kept painted and dry; the original wood windows on many Newton and Brookline houses are a century old. Aluminum runs 15 to 30 and suffers in salt air. The part that usually fails first is not the frame but the sealed glass unit, which fogs when its edge seal gives out, typically somewhere between 12 and 25 years.
Age alone is not the reason to replace. Condition is. A 25-year-old window that is tight, dry and easy to operate can stay. A 12-year-old builder-grade vinyl window that is fogged and binding should go.
lifespan by frame material
Vinyl: 20 to 40 years
The range is wide because vinyl quality is wide. Entry-level units use thinner walls, mechanically screwed corners and basic hardware, and they chalk, warp and sag in 15 to 25 years. Mid and upper lines such as Harvey Classic and Slimline use fusion-welded corners, UV inhibitors and heavier walls and run 30 years and more. Vinyl never needs paint, which is most of its appeal, and dark colors in full sun are the one place it struggles.
Fiberglass and composite: 30 to 50 years
Fiberglass expands and contracts at nearly the same rate as glass, so the seal between frame and glass is not worked loose by every freeze and thaw. That is why these frames outlast vinyl, carry dark colors well and take a painted finish later in life. Andersen Fibrex composite sits in this group.
Wood: 30 years to a century
Old-growth wood windows in houses built before the war are often sounder than anything built in the decades after, and in a historic district repair may be the right first answer. Modern wood windows are usually clad in aluminum or fiberglass on the outside, which removes the paint schedule that killed so many 1960s and 1970s wood windows. Unclad wood needs paint every seven to ten years and a dry sill.
Aluminum: 15 to 30 years
Strong and slim, but a good conductor of cold, so they sweat and frost on the inside in winter. Coastal and salt-air exposure corrodes them. Most aluminum windows in Massachusetts houses are overdue.
why the glass fails before the frame
An insulated glass unit is two or three panes sealed around the edges with a spacer and filled with argon. The seal is rubber or butyl, and sun, heat and moisture age it. When it fails, the gas leaks out, humid air gets in, and you see fog, a milky haze or water between the panes that no cleaning reaches. The window still works; it just no longer insulates. Most manufacturers warranty the seal for 20 years, and premium lines longer. When the frame is still sound, the glass unit alone can be replaced; when the frame is also tired, the failed seal is the push to replace the window.
signs it is time to replace
- Fog or moisture between the panes. The seal has failed. Condensation on the room side on a cold morning is humidity, not failure; between the panes is failure.
- Drafts with the window locked. Hold a hand or a tissue near the sash on a windy day. Worn weatherstripping can be replaced; a warped sash or a racked frame cannot.
- Hard to open, close or lock. Broken balances, swollen wood or a frame out of square. A window that will not stay open or will not lock is a safety problem.
- Soft wood, peeling paint, stains below the window. Water is getting into the sill or the wall. This is the sign that calls for a full-frame replacement rather than an insert.
- Cold glass and high heating bills. Single-pane glass, failed seals and uninsulated weight pockets all show up on the bill.
- Outside noise. Old single-pane and thin double-pane units let the street in.
- Chalky, cracked or yellowed vinyl. The material has reached the end of its life.
repair or replace?
Repair is the answer when the problem is isolated and the frame is sound: a broken lock or balance, worn weatherstripping, a single cracked pane, peeling caulk, or one fogged glass unit in an otherwise good window. Storm windows can also bring a sound single-pane wood window close to modern performance for a fraction of the cost, which is often the right move on a historic house.
Replacement is the answer when the frame is rotted or warped, when several seals have failed, when water is getting into the wall, when the windows are single-pane or aluminum, or when the repair list costs close to a new unit. Replacing for energy savings alone is a slow payback; people replace for comfort, quiet, stopping water damage and ending the yearly repair cycle, and the energy saving comes with it.
is it worth replacing 20 or 30 year old windows?
At 20 years, look at condition. Quality vinyl, fiberglass and clad wood from that era can have another decade in them if the seals are intact and the frames are tight. Builder-grade vinyl from that era is usually done. At 30 years, most vinyl and aluminum windows have reached the end of their functional life even when they look fine: the seals, balances and weatherstripping are tired and the glass is a generation behind on coatings. Sound wood windows at 30 are a different story and may only need paint and glass.
what makes new windows last in new england
- Installation. A window set out of square, under-shimmed or badly flashed fails early no matter what it cost. Full-frame installs get a sill pan and flashing tape tied into the weather barrier; inserts get a solid, probed frame and a proper seal.
- Frame choice for the exposure. Fiberglass or composite on the south and west faces and in dark colors; vinyl where it is shaded; clad wood where the look calls for it.
- Maintenance that takes an hour a year. Clean the weep holes, check the exterior caulk, lubricate the balances and locks, and repaint unclad wood on schedule.
- Warranty. Harvey windows carry a lifetime warranty on materials and labor, including accidental glass breakage. Andersen warranties the glass and the frame for 20 years. Ask for the paperwork before you sign anything.
Our installed prices run from $998 per vinyl window to $2,110 for deluxe wood, with insert replacement at $250 more per window and triple insulated glass at $85. The calculator on this page prices your count. Plum ProExteriors is a Massachusetts registered Home Improvement Contractor (HIC 193823), holds a Construction Supervisor License (CSL 115189) and a Lead-Safe Renovation Contractor license (LR004195), and is an Andersen Certified Contractor and a Harvey Elite dealer.
not sure if your windows are done?
Book the free estimate. We check the seals, sashes and sills, tell you which windows have years left, and price only the ones that do not.
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Window pricing depends on the frame material, the installation type, the style, the glass and how many windows you are replacing. Answer a few questions for a standard, premium and deluxe range in seconds. Every project is quoted after we visit, and financing is available on every service we offer.
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frequently asked questions
How long do vinyl windows last?
Quality vinyl lasts 20 to 40 years; builder-grade vinyl 15 to 25. Fusion-welded corners, heavier walls and UV inhibitors are the difference. The glass seal usually fails before the frame.
At what age should windows be replaced?
There is no age. Replace when the seals have failed, the frame is soft or warped, the sashes bind or will not lock, or water is getting in. Many windows reach that point between 20 and 30 years; good ones later, cheap ones sooner.
How can I tell if my windows need to be replaced?
Fog between the panes, drafts with the window locked, sashes that stick or will not lock, soft or stained wood around the frame, cold glass and rising heating bills. One of these may be a repair; several together mean replacement.
Should I replace 30 year old windows?
Vinyl and aluminum at 30 years, usually yes. Sound wood windows at 30 may only need paint, weatherstripping or new glass. We tell you which during a free estimate.
Can you replace just the glass?
Yes, when the frame is sound and the problem is a failed seal or a cracked pane. It costs a fraction of a new window. When the frame is also tired, a new window is the better spend.
Do new windows need a permit in Massachusetts?
Full-frame replacements and any size change require a building permit; same-size inserts require one in many towns. We file it. Homes built before 1978 also fall under lead-safe renovation rules, which we are licensed for.
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We check every window and tell you which to keep, which to repair and which to replace.
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