When to Repair vs. When to Replace Windows

If you pay attention, your house can give you many signs when something’s not right. And a home’s windows are especially communicative when they need to be repaired or replaced. 

There are two major factors that drive this decision: age of the home and severity of the failure. Let’s look at the big picture of repairing versus replacing.

Big Picture: Repairing vs. Replacing Windows

Windows in older homes are the windows that should be replaced, NOT a 10-year-old house. 

The claims made by window replacement companies about energy efficiency and saving money on energy bills are based on turn-of-century homes with single pane glass and no weatherstripping. These promises of improved efficiently are over-exaggerated for what the industry would consider “modern-day” window technology, such as those in homes built after around 1980.

When it comes to the construction of the window, little has changed in 40 years. While glass technology has certainly come a long way, the general construction of the typical wood window hasn’t improved much at all. This means for homes built in the last 30-40 years, you should consider sash replacement and/or repair as the glass itself can still be brought up to current technology standards while tearing out and replacing the entire frame doesn’t gain much at all. A whole brand new window won’t provide more benefits than you already have, except for the feeling of “getting new stuff.”

However, besides enjoying the feeling of buying new windows, there are other, legitimate reasons to replace your windows entirely. One reason is building codes. Especially in places such as coastal areas, if you update your exterior, you are required to bring your windows up to the newest code as well, which may necessitate replacing your windows. 

Another is frame rot. Sometimes the frame has been so damaged that even the interior structure of the wall has been compromised. At that point, replacement is your only option.

However, repair is a far more reasonable and cost-effective option for most homeowners when professionals and superior products are utilized. There are few window failures that a repair method can not correct, such as foggy glass, rotten sashes, broken hardware, worn weatherstrips, minor frame rot, hail damage, better glass technology and more.

All of the most common window issues just listed can be corrected using quality repair kits from a quality company. Plus, sash replacement takes about 20 minutes apiece. Whole houses can typically be switched out in 2 days or less for a 70-80% savings, and you don’t have to worry about holes in the side of your house for several days when your replacement windows get delayed.

Here is a list of different conditions in which you may find your windows, and advice on how to know when you should repair or replace your windows: 

1. REPAIR or REPLACE: If your windows are damaged, warped, or broken

repair vs replacing windows

If your windows only have some superficial damage, you may be able to get away with adding new weather-stripping or hardware. If this is the case, then repair is your best option. If the window sash or frame is damaged, warped, or broken, then replacement is often preferred to repair.

If your windows show other symptoms, such as fogging up, feeling drafty, sticking when you try to open or close them or refusing to stay open, then it is time to replace your windows.

2. REPLACE: If your windows are costing you too much on your energy bill 

According to the Department of Energy, “Heat gain and heat loss through windows are responsible for 25%–30% of residential heating and cooling energy use.” If you want to reduce unnecessary energy costs, replace your drafty windows with energy-efficient ones. 

Plus, if you’re considering putting your home up for sale in the future, those new windows, and the resulting energy cost savings, can be a big selling point.

To find the windows that are right for your home, keep your specific needs in mind as you explore all your options:

Casement Windows

If you want to keep true to the original design of your home, you’ll need to find the right casement window. This could prove difficult as many older model windows are no longer created. Instead, try a replica casement, such as Fenster’s QuickSash Replica Casement.

The Fenster Quiksash is a complete, assembled replacement sash with new lowE glass, cladding, and weather-strip for a painted or clad-wood casement or awning style window.

Double Hung Replacement Windows

If you have a double hung window in an older style, you may run into the same issue as casement windows. Older style windows are no longer made and replacements are hard to come by. 

However, Fenster has a QuickSash for double hung windows as well. Also known as a “sash-pack,” it is designed to fit nearly any brand of painted or clad-wood tilt-in window with existing vinyl compression jamb liners. The kit comes with everything you need for a complete assembled double hung sash, with an upper/lower sash set and new balance kit measured for your opening.

3. REPLACE: If your home needs a makeover

If your windows are aging with your home, or you are already renovating or upgrading the appearance of your home, then chances are, your windows need replacing. 

Nothing sticks out like a sore thumb more than mismatched windows on a renovated home. Upgrading your windows along with your other renovations enhances the overall appearance of your whole home, increasing property values and completing appealing aesthetics. 

If the color is fading or window material is warping, then it’s time to replace your windows. If you are replacing your windows, take advantage of changing the type of window you have, from a fixed sash to a window that opens, to improve airflow through your home. 

For a more modern look, you may consider installing larger windows to brighten your home with natural light.

4. REPLACE: You just survived a severe storm

If you live in a hurricane zone or area prone to severe weather events, you are likely prepared for the possibility of damaged windows. In fact, just living near a coast can do a number on your windows, even without the help of a major weather event. 

If you worry about the effects of sea salt, humidity or coastal winds, consider getting higher quality window casements.

Fenster’s Quiksash Clad/Wood Casement Sashes are guaranteed to work and perform at a much higher level than the original window by deleting engineering flaws like boot glazing and exterior glazing stops. 

These windows are made with a material that expands at the same rate as glass. They are engineered with this material to resist corrosion and withstand extreme temperatures. Quiksash is an after-market sash replication of many older major brands that are no longer available and is guaranteed to exceed like, kind and quality requirements of the insurance industry.

If your older windows have been damaged due to hail, request a quote for Quiksash.

5. REPAIR: If you’re renovating a historic home

The wrong window can dramatically change the overall look of a historic home and can even interfere with its integrity. Homeowners often worry that the sash will look too modern. However, there are options to repair your windows while protecting the charm of a historic home. 

Windows help define your home’s look and can be an important architectural detail. Replacing windows, especially ones with stained or leaded glass or decorative wood grilles, can actually lower the house’s value. 

If you need stained glass or other historic components not offered by companies such as Fenster, talk to your local preservation commission. They may provide guidelines and suggest skilled craftsmen and contractors who can do repairs.

5. REPAIR: If you have rot and jammed sashes

You should inspect your windows for signs of decay or water damage after every major storm, especially if you have older windows. If you see signs of water penetration, then repair your windows to prevent rot. 

Or if you notice your sashes starting to stick, you’ll need to repair them as well. A pro will be able to repair rot, jammed sashes and broken parts. But sometimes you can do the work yourself. Check out a reputable company for advice on how to do repairs yourself and get the parts you need.

Looking to repair or replace your windows?

If you want to get the best repair and replacement kits for your windows, make sure to pick a company that has extensive knowledge of the industry and products. Experts like Fenster Components understand window construction, manufacturing techniques, brand history and industry terms to build and install a custom-designed window sash. 

Check out our product lines to find the right parts for your home’s window. Or for more information or help, contact us by email at sales@fensterUSA.com.


  • Daniel Ciszar
    Posted December 31, 2019 at 7:04 pm | Permalink

    Hi, I have 30 year old double hung weathershield windows in our house. Noticing air infiltration and loose fitting sashes in one particular window. This window was removed and reinstalled when addition was built into the house. I fear the window frame is bowed out along the sides. The jambliners aren’t tight enough against the sashes to air seal against the force of the wind.

    How can I fix this? Would new jambliners help? Can I shim behind the existing jambliners?



    • Posted January 3, 2020 at 9:28 pm | Permalink

      Hi Dan, well, I have to admit, I’m not real familiar with Weathershield products. They’re not a fan of us trying to help their customers so we don’t support them either. I can help in theory I guess. IF? If you are working with a unit that has vinyl compression jambliners, then the tension on the sash is provided by foam backing on the liner. I have in the past, 1. either added a shim behind the liner, or 2. added more foam of some kind to tighten the seal on the sashes. Keep in mind you might have to forego some functionality. I’ve done it many times in my window repair days. It’s a simple, cheap fix. Now, if these Weathershields don’t have compression liners….I don’t know what to tell you. I guess you could pull the trim and break the jamb loose from the wall and shim the entire frame if its a static liner. You mentioned the window had been re-set in a remodel. Perhaps the jamb was never shimmed in the first place?

  • Paul James
    Posted May 6, 2020 at 2:42 pm | Permalink

    We have 3 MW windows off our kitchen. The center one is a swing out and the other two are stationary/no opening movement. I need all the sashes replaced and need to order ASAP. The replacement dimensions for all 3 windows are 27 inches Wide x 63 1/4 inches High. I would like to order these asap to 1865 Falls Pointe Lane Commerce Township, MI 48382.

    • Posted May 11, 2020 at 1:26 pm | Permalink

      Hi Paul, Didn’t we already talk about this? Didn’t you send in pictures and you have a model we don’t make. Isn’t that where we left it?

  • Mike Pampalone
    Posted May 16, 2020 at 8:09 pm | Permalink

    We have a brick house built in 1999 with MW windows throughout. The windows are wood inside and out (no cladding). The sashes are in bad shape (rotting) with some sill damage. I’ve replaced one sill and brick mold with PVC (looks great) and patched/painted (w/Bondo) other areas. However, the sashes cannot be repaired. I tried fixing a couple, but the damage is too extensive. The windows are mounted in vinyl compression jambs In good working order with what appears to be a square profile. The sashes throughout the house are basically two dimensions 27 1/2 h x 30 1/2 w and 31 1/2 h x 30 1/2 w. Do you have clad sashes that would fit? If not, would the sash packs work? Would I need to replace the entire window since the frames are wood (I hope not). Appreciate any advice.

    • Posted May 17, 2020 at 3:51 pm | Permalink

      The sash packs would be your only option Mike. We don’t build individual, brand specific double hung sashes. There’s a whole slew of reasons why we don’t…or can’t. It made more sense to us to invest in the development of one single product that retro-fits into several different brands of window….assuming that window was originally constructed with vinyl compression jambliners.

      To your cladding question. No difference in fit or appearance between a cladded unit and primed. If your house trim is already white or beige (available clad colors) I would highly recommend switching to the clad for less painting and maintenance.

  • Mike Pampalone
    Posted May 18, 2020 at 5:19 pm | Permalink

    Ryan, Thanks for the reply. I have questions about options. Do you offer the following for your sash kits:

    1. Grids with different inside and outside color (white inside, sand outside)?
    2. Kits with grids on the top sash and no grids on the bottom sash?

    • Posted May 21, 2020 at 6:48 pm | Permalink

      Mike, We don’t offer the two-tone grills. Just too many variations out there. Putting them in the top and not the bottom is no problem. That’s a spec we can iron out during the approval process.

  • Posted December 8, 2020 at 10:11 pm | Permalink

    Yesterday my husband noticed that the front window of our house was starting to warp. We are hoping to find a reputable window installation or repair service that can either fix or replace our window. I appreciate you saying that almost all damages or failures can be repaired or replaced.

    • Posted December 17, 2020 at 8:12 pm | Permalink

      Charlotte, so would we! Yes, with the right products and the right expertise, most window issues can be repaired. We have the right products. It’s the expertise we wish we could find. We are on a non-stop search for talented technicians both internally and around the country.

  • Averil Rine
    Posted April 8, 2021 at 4:06 pm | Permalink

    Hi, I have Triple Coil Balance systems with tilt windows. Some of the coves of the Balance system are cracked and falling apart, and in a few of them the balance springs themselves are broken making it impossible to slide the sash. Would I be able to have the windows repaired or do I have to replace them all?

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