Should You Repair or Replace Your Windows?
Repair is cheaper today and replacement is cheaper over a long enough period, which makes this a question about time rather than price. This page sets out when each one makes sense, and the handful of questions that usually settle it.
When a repair is the right call
A repair makes sense when the problem is one part of one window and the rest of it is sound. A broken sash lock, a snapped balance cord, worn weatherstripping, a cracked pane in a single pane window, a sash that has been painted shut. In each case the window as a whole is doing its job and one piece of it is not. If the frame is solid, the window is well inside its expected life and the rest of the set is in good shape, a repair buys years rather than months.
When replacement is the better value
Replacement becomes the better value when the window itself is the problem rather than one part of it. That usually looks like a rotted or warped frame, a failed seal in a double pane unit, several things wrong with the same window, or a window close enough to the end of its expected life that a repair is buying a season. It also applies when most windows in the house are showing the same age. Fixing one of them does not make the rest perform any better.
The cost of repeating repairs
Each repair has a fixed cost before any work happens, because someone has to come out and take the window apart. On a set that needs attention once, that is reasonable. On a set where a different window needs something every season, it adds up quickly and it buys nothing permanent. It is worth adding up what has already been spent in the last few years before deciding on another repair, because that figure often brings the two options closer than expected.
Matching old windows
Replacing one window in a row of old ones rarely looks right. Frame profiles, colours and glass tints change over the years, and even a close match stands out next to windows that have weathered for two decades. This matters most on the front of the house. It is one reason some homeowners replace a whole elevation rather than a single window, and it is worth raising before the work rather than noticing it after.
Age as the deciding factor
When the other signs are ambiguous, age usually decides it. A window in the first half of its expected life is normally worth repairing. A window in the last quarter is normally worth replacing, because a repair is being made to something that will need replacing soon anyway. The middle is a judgement call, and it is the one worth asking a contractor to make out loud rather than guessing at from the ground.
What a contractor looks at
Someone assessing a window is looking at more than the problem you called about. They are looking at whether the frame is sound and square, whether the sill is holding water, whether the seal on the glass unit has held, how the window operates, and whether the same wear shows across the rest of the house. Those things together decide whether the window has years left or not, and they are the reason an estimate visit is worth more than a guess.
FAQ
Common questions
Is it worth repairing a twenty year old window?
Sometimes, if the frame is sound and the problem is one part, such as a lock, a balance or weatherstripping. But at that age a repair is often buying a short extension rather than years, so it is worth asking what the contractor thinks the remaining life is before deciding. That answer usually settles it.
Can a fogged double pane window be repaired?
The sealed glass unit cannot be resealed, but in many windows the glass unit can be replaced while the frame stays. Whether that is worth doing depends on the condition and age of the frame. On an old frame it is usually better to replace the whole window.
Can I replace just one window?
Yes, and when one window has failed on an otherwise sound set it is the sensible answer. The thing to consider is the match. A new window beside old ones will look different, which matters more on the street side than at the back.
How many repairs are too many?
There is no fixed number, but repairs becoming more frequent is the signal rather than the count itself. A set that needed attention once five years ago is different from one where a different window needs something every season, even if the total spent is similar.
Does a repair affect the window's warranty?
It can, depending on who does the work and what the original warranty covers. If the windows are still under a manufacturer's or installer's warranty it is worth checking the terms before anyone works on them, because some warranties are affected by work carried out by a different contractor.
Related guides
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