How long do windows last?

Installed windows have a life expectancy greater than 30 years, according to the U.S. Department of Energy (DOE) in its Vacuum Insulation for Windows project description (project page dated June 13, 2014, read 2026-10-29, national, n not published by the source). DOE gives it as a floor, not an average and not a figure for one frame material.

Source: DOE Vacuum Insulation for Windows project page, read 29 October 2026. Updated 2026-10-27

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By window frame material, 38.4% of US households had “Metal (aluminum)” frames in 2020 (EIA RECS 2020, read 2026-10-29, n = 18,496, SE 0.3 points), 32.6% had “Wood” (EIA RECS 2020, read 2026-10-29, n = 18,496, SE 0.4 points) and 25.8% had “Vinyl” (EIA RECS 2020, read 2026-10-29, n = 18,496, SE 0.3 points). Of the same households, 35.2% had “Single-pane glass” as the type of glass in most windows (EIA RECS 2020, read 2026-10-29, n = 18,496, SE 0.4 points). We computed these from the public microdata of the 2020 Residential Energy Consumption Survey (RECS) of the U.S. Energy Information Administration (EIA); EIA imputed (filled in statistically) the frame material for 13.1% of the households counted and the glass type for 8.5%. Each figure is a share of homes by frame or glass, never an age of the windows or how long a window lasts.

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By InstaBids editorial team with AI research agents. Sources read: 29 October 2026

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In our own counts, n is the number of surveyed households behind a share and SE is its standard error, a measure of sampling error, in percentage points.

How long it lasts, by source

Installed windows, DOE: a life expectancy “greater than 30 years” (project page dated June 13, 2014, read 2026-10-29, national, n not published by the source). DOE names no frame material and gives no average.
Windows in historic buildings, National Park Service (NPS): “The windows in many historic buildings have functioned for more than 100 years and, with regular maintenance, will usually survive longer and work better than any replacement window.” (NPS, page last updated April 11, 2022, read 2026-10-29, national, n not published by the source)

On windows in US homes, a DOE Building America guideline says: “Most windows are still original to the homes; however, it is not uncommon for windows to be replaced (Figure 2).” (DOE Building America guideline, December 2012, read 2026-10-29, national)

NPS adds a line on newer windows: “Unlike historic windows, new window assemblies cannot be repaired; they can only be replaced once again.” (NPS, page last updated April 11, 2022, read 2026-10-29, national, n not published by the source)

How long one window lasts depends on moisture, maintenance and the window sill.

Type	Measure	Figure	Area	Data years	Source
Installed windows (DOE project page)	life expectancy, a floor: greater than (DOE statement, not an average)	30 years	national	project page dated June 13, 2014; no data years published	U.S. Department of Energy, Vacuum Insulation for Windows, read 2026-10-29, n not published by the source.
Windows in many historic buildings (NPS)	functioned for more than (NPS statement, a floor, not an average)	100 years	national	page last updated April 11, 2022; no data years published	National Park Service, Weatherization of Historic Buildings: Repair and Upgrade Windows and Doors, read 2026-10-29, n not published by the source.
WINFRAME "Metal (aluminum)"	weighted share of households (our tabulation; a share of homes, never a lifetime or an age)	38.4 percent of households	US	2020	U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 2026-10-29, n = 18496, SE 0.3 points.
WINFRAME "Wood"	weighted share of households (our tabulation; a share of homes, never a lifetime or an age)	32.6 percent of households	US	2020	U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 2026-10-29, n = 18496, SE 0.4 points.
WINFRAME "Vinyl"	weighted share of households (our tabulation; a share of homes, never a lifetime or an age)	25.8 percent of households	US	2020	U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 2026-10-29, n = 18496, SE 0.3 points.
TYPEGLASS "Single-pane glass"	weighted share of households (our tabulation; a share of homes, never a lifetime or an age)	35.2 percent of households	US	2020	U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 2026-10-29, n = 18496, SE 0.4 points.
WINFRAME "Metal (aluminum)"	weighted share of households (our tabulation; a share of homes, never a lifetime or an age)	68.7 percent of households	Florida (state)	2020	U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 2026-10-29, n = 655, SE 1.8 points.
WINFRAME "Wood"	weighted share of households (our tabulation; a share of homes, never a lifetime or an age)	16.6 percent of households	Florida (state)	2020	U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 2026-10-29, n = 655, SE 1.4 points.
WINFRAME "Vinyl"	weighted share of households (our tabulation; a share of homes, never a lifetime or an age)	11.0 percent of households	Florida (state)	2020	U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 2026-10-29, n = 655, SE 1.2 points.
TYPEGLASS "Single-pane glass"	weighted share of households (our tabulation; a share of homes, never a lifetime or an age)	49.4 percent of households	Florida (state)	2020	U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 2026-10-29, n = 655, SE 1.7 points.

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When your windows are near the end of these figures, you can describe the window job once on InstaBids and contractors bid in writing.

Signs it is near the end

Sign or age	What the source says	Source
Stains below the window	DOE Building America guideline: “Water staining, peeling paint or wall paper, and staining on trim or floor assemblies below window systems indicate water infiltration and/or condensation.” It also says “Windows are the most common location of water infiltration issues.” (DOE Building America guideline, December 2012, read 2026-10-29, national)	DOE Building America wood window guideline (2012), read 29 October 2026.
Blistering or peeling paint	NPS Preservation Brief 9: “areas of paint blistering, cracking, flaking, and peeling usually identify points of water penetration, moisture saturation, and potential deterioration.” (NPS Preservation Brief 9, no issue date on the captured pages, read 2026-10-29, national)	NPS Preservation Brief 9, read 29 October 2026.
Drafts at the window	DOE Building America guideline: “Window air leakage is a significant source of occupant comfort problems.” It adds that window air leakage “is commonly very direct, resulting in distinct drafts.” (DOE Building America guideline, December 2012, read 2026-10-29, national)	DOE Building America wood window guideline (2012), read 29 October 2026.

If you see stains, peeling paint or drafts at a window, you can post the window job on InstaBids and compare written bids.

Questions

How long do vinyl windows last?

None of the government sources we read on 2026-10-29 gives a lifetime for vinyl frames alone. DOE's figure covers installed windows of every frame: a life expectancy “greater than 30 years” (project page dated June 13, 2014, read 2026-10-29, national, n not published by the source). In our weighted tabulation of EIA's 2020 survey, 25.8% of US households had “Vinyl” window frames (EIA RECS 2020, read 2026-10-29, n = 18,496, SE 0.3 points), a share of homes and not a lifetime.

Source: DOE Vacuum Insulation for Windows project page, read 29 October 2026.
Source: EIA RECS 2020, read 29 October 2026.

What is the average lifespan of a window?

DOE's figure is a floor, not an average: its project page refers to “the life expectancy of installed windows being greater than 30 years” (project page dated June 13, 2014, read 2026-10-29, national, n not published by the source). For older windows, NPS writes that “The windows in many historic buildings have functioned for more than 100 years” (NPS, page last updated April 11, 2022, read 2026-10-29, national, n not published by the source). Neither source publishes an average window lifespan.

Source: DOE Vacuum Insulation for Windows project page, read 29 October 2026.
Source: NPS weatherization guidance (last updated April 11, 2022), read 29 October 2026.

How do you make windows last longer?

NPS Preservation Brief 9 names the main threat: “moisture is the primary contributing factor in wooden window decay.” It says of its first repair class: “Note that most of the points mentioned in Repair Class I are routine maintenance items and should be provided in a regular maintenance program for any building.” (NPS Preservation Brief 9, no issue date on the captured pages, read 2026-10-29, national) NPS weatherization guidance adds: “Caulking, weatherstripping, and replacing deteriorated glazing compound to seal air leaks should always be done before considering replacing historic windows.” (NPS, page last updated April 11, 2022, read 2026-10-29, national, n not published by the source)

Source: NPS Preservation Brief 9, read 29 October 2026.
Source: NPS weatherization guidance (last updated April 11, 2022), read 29 October 2026.

How can you tell if window wood is rotting?

NPS Preservation Brief 9 gives a simple test: “An ice pick or an awl may be used to test wood for soundness.” (NPS Preservation Brief 9, no issue date on the captured pages, read 2026-10-29, national) The DOE Building America guideline singles out the sill: “The window sill is arguably the most important element of the window assembly”, and “Cracked or rotting sills need to be replaced before any work is done” (DOE Building America guideline, December 2012, read 2026-10-29, national).

Source: NPS Preservation Brief 9, read 29 October 2026.
Source: DOE Building America wood window guideline (2012), read 29 October 2026.

Do old windows have lead paint?

The U.S. Environmental Protection Agency (EPA) writes: “Approximately three-quarters of the homes in the United States built before 1978 still contain some lead-based paint.” It adds that “Old or worn lead-based paint, especially on surfaces subject to constant friction like doors or window sills, can produce chips and dust that become a hazard when inhaled or ingested.” (EPA, page last updated on June 17, 2026, read 2026-10-29, national, n not published by the source) The DOE Building America guideline says “Lead is commonly located on old wood windows and trim.” (DOE Building America guideline, December 2012, read 2026-10-29, national)

Source: EPA lead renovation page, read 29 October 2026.
Source: DOE Building America wood window guideline (2012), read 29 October 2026.

Should you repair or replace windows?

NPS sorts window work into three categories, “routine maintenance”, “structural stabilization” and “parts replacement”, and writes: “If most of the work falls into the first two categories, the windows should be repaired.” Where “a large number of new parts are required,” NPS points instead to “a good, matching replacement window.” (NPS, page last updated April 11, 2022, read 2026-10-29, national, n not published by the source) The DOE Building America guideline adds that “windows with severely deteriorated sashes may be better candidates for the latter retrofit measures”, meaning sash replacement, an insert or a full replacement (DOE Building America guideline, December 2012, read 2026-10-29, national).

Source: NPS weatherization guidance (last updated April 11, 2022), read 29 October 2026.
Source: DOE Building America wood window guideline (2012), read 29 October 2026.

Whether your windows are vinyl or wood, you can post the window job on InstaBids and see written bids on that scope.

In Florida

In Florida, 68.7% of households had “Metal (aluminum)” window frames in 2020 (EIA RECS 2020, read 2026-10-29, n = 655, SE 1.8 points), 16.6% had “Wood” (EIA RECS 2020, read 2026-10-29, n = 655, SE 1.4 points) and 11.0% had “Vinyl” (EIA RECS 2020, read 2026-10-29, n = 655, SE 1.2 points), in our weighted tabulation of the same EIA microdata; EIA imputed the frame material for 15.1% of the Florida households counted.

Of the same Florida households, 49.4% had “Single-pane glass” in most windows (EIA RECS 2020, read 2026-10-29, n = 655, SE 1.7 points); EIA imputed the glass type for 10.4% of the Florida households counted. These are shares of homes, not lifetimes.

If your windows face storms or salt air, you can describe the window job on InstaBids and contractors bid in writing.

Repair or replace

Sign or age	What the source says	Source
Cracked or rotting sill	DOE Building America guideline: “Cracked or rotting sills need to be replaced before any work is done” (DOE Building America guideline, December 2012, read 2026-10-29, national).	DOE Building America wood window guideline (2012), read 29 October 2026.
Lead paint present or suspected	DOE Building America guideline, among its reasons not to proceed: “Lead paint is present or suspected on the window or window frame.” EPA: “Any renovation, repair or painting project in a pre-1978 home or building that has lead-based paint can easily create dangerous lead dust.” (EPA, page last updated on June 17, 2026, read 2026-10-29, national, n not published by the source)	DOE Building America wood window guideline (2012), read 29 October 2026. EPA lead renovation page, read 29 October 2026.

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Repair or replace windows

The choice between repair and replacement depends on a large number of new parts, severely deteriorated sashes and lead paint.

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Prices for new windows are a separate question, with their own sources on our national cost page: How much does it cost to replace windows?

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Sources for the figures on this page

U.S. Department of Energy, Vacuum Insulation for Windows, read 29 October 2026. U.S. government work, public domain.
U.S. Energy Information Administration, 2020 Residential Energy Consumption Survey (RECS), public-use microdata file v7, read 29 October 2026. U.S. government work, public domain; EIA credited as the source. Microdata file: recs2020_public_v7.csv.
National Park Service, Weatherization of Historic Buildings: Repair and Upgrade Windows and Doors, read 29 October 2026. U.S. government work, public domain.
U.S. Department of Energy, Building America, Measure Guideline: Wood Window Repair, Rehabilitation, and Replacement (Building Science Corporation, December 2012), read 29 October 2026. U.S. government work, public domain.
National Park Service, Preservation Briefs 9: The Repair of Historic Wooden Windows, read 29 October 2026. U.S. government work, public domain.
U.S. Environmental Protection Agency, Lead Renovation, Repair and Painting Program (last updated on June 17, 2026), read 29 October 2026. U.S. government work, public domain.

Method: our own shares, such as the 25.8% of US households with “Vinyl” window frames (EIA RECS 2020, read 2026-10-29, n = 18,496, SE 0.3 points), are weighted with EIA's survey weights and carry standard errors from its replicate weights; every other figure is quoted from the source named beside it.