Replacement Window Warranty Decoder: What “Lifetime,” Glass, Labor & Transferable Actually Mean

Updated September 22, 2026. Every series-specific term below comes from the manufacturer’s own warranty document or warranty page, checked on that date. How we research this

“Lifetime warranty” is not a standard term. On a replacement window it almost never means parts and labor, on every component, forever. It usually means one or two components are covered for as long as the original buyer owns and lives in the home — while the sealed glass, hardware, finish and labor each run on their own, shorter clocks. The exact terms change by component, by owner, by series, by purchase date and sometimes by where you bought.

This guide decodes those terms. It compares nine window lines we already cover, component by component, and shows what changes when the house is sold. It does not rate or rank warranties. Use it to read the warranty that comes with your quote, and to know which questions to ask before you sign or before you pay for a repair.

Five distinctions that decide what you are actually covered for

1. Manufacturer product warranty vs. installer workmanship. The manufacturer covers defects in the window it made. Leaks, drafts or damage caused by how the window was installed are excluded by every manufacturer document we reviewed. Installation is covered — if at all — by a separate written promise from whoever installed it.
2. Frame and sash vs. the sealed glass unit (IGU). The “lifetime” part is usually the frame material. The insulated glass unit, whose failed seal causes fog between the panes, is typically a separate term (commonly 20 years in the documents below).
3. Parts vs. labor. Many warranties supply a replacement part but not the service call, removal, reinstallation, refinishing or disposal. Some include labor only for the first two years. One ties labor to the manufacturer’s own service territory.
4. Original owner vs. transferable. Some lifetime terms end the day the original buyer sells, rents out or moves out. “Transferable” may apply to the whole warranty, to one component, or to one subsequent buyer only.
5. Full term vs. what changes after transfer. Several documents replace the lifetime term with a fixed term — often counted from the original date of sale or manufacture, not from the day the new owner moved in. None of the window documents we reviewed uses a percentage proration schedule; the reduction happens through ownership rules instead.

Doors are written on the same axes — component, labor, ownership — but each line’s terms are set out in its own document, and a window document does not answer for a door — transfer rules and rot exclusions in particular have to be read on the door’s own paperwork. If a door is in the same project, see how door warranties differ.

Compare what window warranties actually cover

Nine lines, three tables: what each component is covered for, how labor and ownership work, and the exclusions and sources behind every row. Where a term was not stated in the document we reviewed, the cell says so rather than guessing. Swipe sideways on a phone to see every column.

1. Coverage by component

2. Labor, owners and what happens when the house is sold

3. Exclusions, claim deadlines and sources

Terms summarized from each manufacturer’s published document for the purchase period shown. They are not legal advice, they do not describe older windows sold under earlier warranties, and they are not a ranking. Andersen rows use Andersen’s own series comparison page because the series certificate for current purchases was not retrievable during our check; cells we could not confirm are marked. If your paperwork differs, your paperwork governs. Brand and series pages: window brands hub.

Decode your warranty in 60 seconds

• Fog between the panes → find the insulated glass (IGU) or seal-failure term, then the labor line. Glass may be free while the service call is not. Deep dive: fog between window panes.
• Broken lock, crank or balance → the hardware or moving-parts term. Check whether finish tarnish is excluded and whether the part ships to you or is installed for you.
• Water around the frame → decide product vs. installation first. Water getting past flashing or caulk is excluded from the manufacturer documents above; that goes to the installer’s workmanship warranty. Background: insert vs. full-frame replacement.
• Selling or buying a house → the transfer clause, any deadline to transfer, and whether terms shrink or restart from the original sale or manufacture date.

Warranty phrases, decoded

Common situations, answered from the documents

My windows are fogging between the panes

That is a seal failure — the one problem most of these warranties cover for a long time (20 years in the Pella, Marvin, Andersen-summary and Milgard terms above; lifetime for ProVia’s original purchaser). What usually decides your cost is labor. Pella includes labor only in the first two years after sale; Marvin and ProVia exclude installation labor; Milgard provides skilled labor for 10 years from manufacture only inside its service territory. Before paying a glass shop, check whether a third-party swap affects the remaining claim, and compare the options in repair vs. replace windows.

A lock, crank or balance broke

That is the hardware or moving-parts term: 10 years for Marvin, Milgard and the Andersen summary, lifetime for ProVia’s original purchaser, and part of the non-glass lifetime for the Pella 250’s original buyer. Hardware finishes (tarnish, discoloration) are excluded in the Pella and Milgard documents. Milgard counts replacing hardware as non-skilled labor the owner handles.

Water is showing up around the window opening

Start by separating product from installation. Every manufacturer document above excludes installation-caused problems, Marvin excludes water infiltration not caused by a manufacturing defect, Pella disclaims responsibility for water infiltration and wall-system design, and Milgard excludes failure to properly incorporate the window into the building envelope. Water at the trim, sill or drywall usually points to flashing or sealing — the installer’s workmanship promise, if you have one in writing. Caulking is treated as the owner’s maintenance item by ProVia and Milgard.

I bought a house that already has replacement windows

You are a subsequent owner. With Pella the non-glass lifetime is gone, replaced by 10 years from the original sale — so on windows sold more than 10 years ago, that non-glass term has already run out. With Milgard the frame term becomes 10 years from manufacture. Marvin’s terms continue unchanged but still count from the original purchase date. ProVia’s basic-unit coverage transfers only if the seller completed the online transfer within 30 days. Ask the seller for the original invoice, order numbers and any transfer confirmation — then read the serial number etched in a glass corner or printed on the spacer.

The contractor says “the manufacturer covers everything”

None of the documents we reviewed does. Each excludes installation, and most exclude or limit labor. Ask for two written documents: the manufacturer’s warranty for the exact series and purchase date, and the installer’s workmanship warranty with its length and what it covers. Put both next to each other with what a window quote should include, and run the quote through the Window Quote Analyzer to flag missing warranty lines.

The glass was free, but I was charged for labor

That is usually how the document is written, not a denied claim. Pella supplies labor only in the first two years; Marvin excludes removal, installation, finishing and disposal; ProVia ships the part to the nearest dealer and leaves labor and transport to the owner; Milgard’s labor depends on age and service territory. When you compare window quotes, a quote that adds a multi-year installer labor promise is offering something the product warranty alone may not.

Before you file a claim: a checklist

1. Find the paperwork: invoice or contract, order number, purchase date, and the installer’s name.
2. Find the product ID: Pella and others print a serial number on the glass spacer or etch it in a glass corner; Marvin asks for the serial number through the dealer.
3. Download the warranty that applies to your purchase date, not today’s brochure.
4. Photograph the problem, the whole window and the label or etching, with dates.
5. Check the claim deadline: Marvin 60 days from the defect appearing, Milgard 30 days from discovery, Pella within one year of discovery.
6. Decide product vs. installation before calling — and call the right party first (dealer, manufacturer or installer).
7. Ask in writing what will be supplied, who installs it, and what you will be charged for labor, trip fees or inspection.
8. Do not let a third party modify the window before the manufacturer responds if a claim is still open.

Still pricing new windows? Warranty terms are one line in the total. Use window replacement cost for the price side.

How we researched this

On September 22, 2026 we opened each manufacturer’s current warranty document or warranty page for the purchase period listed in the tables: Pella’s vinyl warranty (listed by Pella for Aug 29, 2023 to present) and Impervia fiberglass warranty (Nov 30, 2020 to present), plus Pella’s warranty page for its showroom installation program; Marvin’s Limited Warranty effective January 12, 2026; ProVia’s Aeris/Endure/Aspect card dated 12/1/2023; Milgard’s Replacement Product warranty and Full Lifetime upgrade, both effective January 1, 2026; and Andersen’s own series comparison page. Andersen’s series certificates for current purchases could not be retrieved during our check, so Andersen labor, exclusions, transfer mechanics and claim rules are marked as not confirmed rather than taken from dealer pages or older certificates. We did not test products, file claims or survey homeowners. Community forums helped us choose which questions to answer; they are not a source for any term here. Warranties change, and older windows are covered by the document in force when they were sold. Full methodology · editorial policy.

FAQ

Does a lifetime window warranty cover labor?

Usually not for life. In the documents we reviewed, Pella includes labor only in the first two years after sale, Marvin and ProVia exclude installation labor, and Milgard provides skilled labor for 10 years from manufacture inside its service territory.

Does my window warranty transfer when I sell the house?

It depends on the manufacturer and the component. Marvin’s warranty is fully transferable; Andersen describes Owner-2-Owner transferability; Pella and Milgard replace their lifetime terms with 10-year terms; ProVia transfers the basic unit once if the transfer is filed online within 30 days.

Is fog between window panes covered by warranty?

Seal failure is covered in every document we reviewed, typically for 20 years (lifetime for ProVia’s original purchaser). Labor and the purchase date usually decide what you pay.

Who covers leaks around a new window?

If the leak comes from installation — flashing, sealing, the rough opening — the manufacturer documents above exclude it. That is the installer’s workmanship warranty, which is a separate written promise.

Are window warranties prorated?

None of the nine window documents or pages we reviewed uses a percentage proration schedule. Coverage shrinks through ownership rules instead — for example when the original owner sells or rents out the home.

Planning note: This page summarizes published manufacturer warranties for U.S. homeowners. It is not legal advice and does not decide any claim. Terms vary by series, purchase date, sales channel and region; the document delivered with your windows governs. See our methodology and disclaimer.