Author: Bill Hoelzer / Published: July 2022 / Read Time: Four Minutes

Vinyl windows last between 20 and 40 years according to guidelines set by the International Association of Certified Home Inspectors (InterNACHI®).

That’s a big range. 

A more interesting question - What factors lead to a longer lifespan for vinyl windows? This article explores the four factors that have the biggest impact on how long vinyl windows should last. 

If you have questions about replacing vinyl windows in Portland or Central Oregon, feel free to give us a call at (541) 330-8767, or schedule an appointment with one of our consultants today: 

Four factors that determine how long vinyl windows last

Nothing lasts forever.

How long your vinyl windows last depends on a few different factors. Any of the following four factors could result in a window repair or replacement. Or it could be a combination of multiple factors.

1. Quality and Type of Window Materials

The popularity of vinyl windows exploded in the 1990's. Vinyl windows are durable, energy efficient, and less expensive than wood or fiberglass windows. The trouble is that many builders, especially in the 1990s, installed low quality, builder-grade vinyl windows that are now coming to the end of their useful lives. 

How can you tell the difference between a low quality builder-grade vinyl window and a premium vinyl window? Two quick things:

First, look at the warranty.

Premium vinyl windows come with longer warranties. Comparing warranties is one of the quickest ways to assess the relative quality of different vinyl windows. Here at GreenSavers, we primarily install premium vinyl windows from Milgard that come with a lifetime warranty - the best available on the market.

Second, check the labels.

When comparing vinyl windows, spend time on the ENERGY STAR and the National Fenestration Rating Council (NFRC) labels. Here’s what to look for at a glance:

U-Factor

• Range: 0.20–1.20

• Look for: Low numbers

Solar Heat Gain Coefficient

• Range: 0–1

• Look for: Low numbers

Visible Transmittance

• Range: 0–1

• Look for: High numbers

Air Leakage

• Range: ≤ 0.3

• Look for: Low numbers

Third, look at the window components

If you don't have access to the warranty or labels, you can tell a lot by considering the construction of your vinyl windows. Learn more here. In a nutshell, premium vinyl windows have thicker vinyl, a fusion-welded frame and sash, as well as more internal chambers.

2. Local Climate and Weather 

Vinyl windows that are exposed to more extreme climate conditions won't last as long. Here are a couple conditions that impact the lifespan of vinyl windows in Portland and Central Oregon.

• Extreme heat or cold – Extreme temperatures can cause windows to shift or warp over time. 

• Sunlight – Vinyl windows will wear out sooner when they're directly exposed to UV rays from the sun. You may notice that vinyl windows on the south side of your home show more signs of wear than windows on the other sides of your home.

3. Poor or Improper Window Installation

To get peak performance and longevity, it’s essential to work with a quality window installer. A properly installed vinyl window will seal out the elements and deliver energy efficient performance without moving or shifting over the years.

Even the best vinyl windows will fail if you work with an installer who holds themselves to a lower level of professionalism. What’s more, small gaps around the window can let moisture into your home, causing the build up of mold and mildew that result in a host of issues for both your home and your health.

4. Window Usage

Most window styles are designed for function. You can open and close them by sliding a sash or turning a crank. Over time, though, normal usage can cause windows to show some wear. 

If you use certain windows more often, they may wear out more quickly than those you rarely open. In many cases, usage-related issues can be repaired. If a sash sticks, a pane doesn’t close properly, or a crank breaks, you may be able to replace or repair the broken parts and keep the window. Other times, it’s more economical to replace the window entirely.

When to Replace Vinyl Windows

It’s difficult to know how long vinyl windows will last. There are lots of factors to consider, and if you're not the first owner of your home, you may not even know how old your windows are.

If your windows are showing signs of wear and tear - such as weather damage, drafty seals, reduced efficiency, or condensation - it may be time to replace them. For details, check out our article on knowing when to repair or replace windows.

If you're unsure, get a professional opinion: (541) 330-8767. A GreenSavers consultant will assess your windows and help you decide what makes the most sense for your home and your budget.

Learn more about windows

Start by visiting our window resource pages for homeowners in Portland or Bend, Oregon. You can also keep reading our latest blog articles about energy efficient windows.