A Homeowner’s Guide on When to Replace Windows

How long do windows last? When to replace windows? Get answers to these questions and more here.

Nothing lasts forever, but the best windows ought to last for long enough that it’s tough to remember exactly when you installed them! But is that 10 years? 15? Even longer?

For many Knoxville homeowners, windows are great places for curb-appeal-boosting renovations, especially if they’re quite old. The right replacements, in fact, can enhance your energy efficiency and much more! Today, let’s break down how long windows last and when you should replace them.

Average window lifespans

Narrowing down how long a window should last “on average” can be tricky because windows can vary heavily based on:

• Window frame material
• The quality of the glass (and the number of glass panes)
• The quality of window installation
• Other factors

That said, you should assume that a new window, made with modern manufacturing processes and installed properly, will last for anywhere between 15 and 30 years. Furthermore, glass panes themselves last for around 20 years on average, and your average frame can last up to 50 years, assuming no catastrophic damage is done to it in the intervening time frame.

That's a lot of technical talk, but it means your window should last for several decades when all is said and done! Still, it can be helpful to analyze the average lifespan for different window frames and glass setups.

Vinyl window frames

Vinyl window frames are some of the most popular among Knoxville homeowners, and for good reason. They’re cost-effective, durable, and are available in many different colors and styles, so they go perfectly with lots of different home aesthetics. Check out Window World of Knoxville windows to see examples of vinyl windows’ many decorative options!

Vinyl window frames are also known to be fairly long-lasting, but exactly how long do vinyl windows last? Well, with cared-for frames, vinyl windows can survive in good condition for up to 40 years. On average, vinyl window frames should last for between 20 and 40 years based on factors like weather, maintenance, and more. On top of that, vinyl frames don't require a ton of maintenance, and you don't need to constantly refinish them to protect them from wear and tear or water damage!

Aluminum window frames

Aluminum window frames are lightweight and durable, lasting for between 30 and 45 years, provided you give them regular maintenance. That maintenance should include cleaning them with nonabrasive cleaning solutions and soft cloths, which should prevent scratch marks or stains from forming.

Aluminum window frames also won’t rust, so they are among the best metal window frames you can find on the market today. However, they aren’t the most energy- efficient – aluminum is a good conductor of heat, which means it’s a bad insulator compared to something like wood or fiberglass.

Wood window frames

Then there are wood window frames, which are prized among Knoxville homeowners for their appearance. Wood looks phenomenal, but it only lasts for about 20 years at most.

That means wood window frames last for less time compared to other window frame types. Furthermore, you’ll need to maintain your wood window frames carefully to make sure they remain in good condition for as long as possible. That involves repainting or sealing the frames every few years to protect them from weather damage, insects, and warping.

Fiberglass window frames

Fiberglass window frames can last for 50 years or even more, and they're highly energy efficient. Like vinyl frames, fiberglass window frames don't require a lot of maintenance, and they aren't vulnerable to extreme temperatures (hot or cold).

The downside? Fiberglass frames can be a bit pricier than vinyl frames or other alternatives, but they might be well worth it if you want to replace your old windows with new ones that will still look excellent for decades to come.

How long does window glass last?

Window glass can last for up to 20 years. It’s a good idea to mentally and financially prep for some window maintenance or glass repair every 15 years or so, even if your windows look fine and don’t show any serious signs of degradation.

While your windows’ frames are important, the glass also has to be kept in top condition for your windows to be energy efficient!

When to replace windows and signs that they should be replaced

Even though windows can last for decades, many Knoxville homeowners need to replace their windows sooner rather than later. If you’re not sure whether one or more of your property’s windows need attention, watch for the following signs.

Window drafts

A drafty window is a surefire sign that it needs to be fixed or replaced. Drafts are most noticeable in rooms where the temperature is different from elsewhere throughout the house (e.g., it’s warm in most rooms, but the master bedroom is a little too chilly for comfort).

But you can also tell whether a window is drafty by holding a strip of paper near the frame or a suspected draft spot. If it moves with a slight breeze, you know for sure that the window isn't as airtight as it ought to be.

Higher energy bill

Paying more for your monthly utility bill? A higher monthly electricity payment is a proverbial canary in the coal mine when it comes to window efficiency. You see, if your windows are old and not as efficient as they used to be, they might be letting heated or air-conditioned air escape to the outdoors, depending on the season. If you can't track down any other culprit for higher energy costs, it's a solid bet that one or more windows are behind the new weight affecting your wallet.

Mold growth

Sometimes, when windows let air in or out or have serious cracks, moisture and condensation can accumulate on windowsills, between glass panes, and even inside window frames. If you see mold in any of these places, work on replacing the affected window as quickly as possible.

Why? Mold can be a serious health hazard for you and your family, even if you scrub it away with soap and water. You can bet the mold will come back as soon as it has the chance.

Moisture or fog inside the glass

Similarly, any water droplets or fog inside your windows means the airtight seal between the frame and the glass panes has been broken. Not only does this mean that your windows aren’t as energy efficient as they once were, but it also prevents you from having a clear view outside.

You can tell that the moisture or fog affecting your window is inside the glass instead of outside by wiping the surface with your hand or a washcloth. If the water vanishes when you rub it, it’s not a big deal. But water inside the glass panes can only be treated by replacing the panes or replacing the window itself.

Physical damage

Naturally, physical damage to a window – like cracks in the frame, cracks in the glass, or visible warping – tells you that it’s time for a thorough window renovation! In many cases, it’s best to replace visibly damaged windows with new ones to maintain your home’s curb appeal and prevent mold from growing in gaps or weak spots.

Faded floors or furniture

Have a couch, chair, or other furniture right in the path of a sunny picture window? Over time, you might notice that the furniture's color fades or that the same thing happens with patches of carpet that are saturated in sunlight.

What gives? Many modern energy-efficient windows have special glazing on their surfaces that prevents UV rays from affecting fabric. But if your windows are old or damaged, that glazing might not be effective anymore. The best solution is to replace the glass in nearby windows (or simply swap them out for newer models).

Louder noise than usual

The best replacement windows should keep noise out, minimizing annoying sounds from traffic, barking dogs, and your neighbor starting yard work at the crack of dawn. But over time, you could notice that ambient noise from outside gets louder and louder, which is a big indicator that your windows are degrading or showing their age.

Repairing vs. replacing windows

So, you've noticed that one or more windows in your house aren't as high quality as they used to be. But do you really need to replace the problematic window, or can it just be repaired to save a bit of cash?

In many cases, yes! Depending on the exact issues affecting your windows, repairs may be enough to get the job done. In some situations, you might even be able to knock out those repairs yourself with a bit of elbow grease, some weatherstripping, and a few other DIY or at-home solutions.

For the best results, speak to experienced window contractors. They’ll examine your windows and give you their professional opinions about whether:

• The windows in question are likely to last for many years to come
• Repairs will be around the same price as replacements or significantly more affordable

For example, say you have a window in your living room that’s extremely drafty. A window contractor can determine whether the issue is with the frame, with the glass, or something else. Or imagine that you have a 20-year-old window that looks alright, but the frame is starting to crack and warp – you might wonder whether a new window, like a double-hung window from Window World of Knoxville, will give you more bang for your buck compared to squeezing a few extra years of life out of the current window model.

If you do need to replace your windows instead of repairing them, a knowledgeable contractor may be able to provide new window recommendations on the spot.

Choosing replacement windows

If full window replacements are necessary, it’s just as important to pick the right new windows as it is to get the old ones out of the way ASAP!

Ideally, you’ll want stellar windows that:

• Look amazing in the broader context of your house
• Are energy efficient – they’ll reduce your utility bill and help you do your part for the environment
• Keep noise out since no one wants to hear traffic sounds during rush hour

Fortunately, there are lots of high-quality new windows to choose from – and you can find them all at your local Window World.

At Window World of Knoxville, our specialists can not only help you identify which windows need to be replaced on your property with a professional inspection but also guide you in choosing the perfect replacement for your budget and other needs. Stop by our showroom today or contact us online to learn more!