Old Wooden Window: Repair or Replace?

A homeowner with an old wooden window usually has one question: repair it, or replace it entirely? The right answer depends on four factors, not on the window's age or looks.

Check the frame first, not the glass

When a window sticks or won't close properly, many people assume the rubber seal or the glass is to blame. But the real cause is almost always in the frame's wood: moisture that has worked its way through cracked paint into the fibers over the years. This is the same mechanism behind warped wooden doors, which we covered in the wood moisture standard — the same logic applies to windows.

• Press the wood under the paint with a knife tip; if it sinks in and feels soft, rot has set in deep.
• Move the hinge and the lock; sticking or squeaking is usually from a warped frame, not the hardware itself.
• Look around the glass; cracked, detached putty means water is reaching the wood underneath directly.

When repair is enough

If the rot is surface-level or limited to one corner of the frame, a skilled carpenter can cut out that section, splice in matching wood, and repaint — work that typically costs a third to a fifth of a brand-new window. Fresh putty and resealing, if the core wood is sound, can add several more years to the window's life.

If the frame's core wood is sound, don't throw the window out — repair it.

When you should replace it

• Rot has spread across more than a third of the frame's width and there's nothing left to splice.
• Multiple layers of old paint stacked on top of each other with no bare wood ever showing — a sign of repeated surface fixes that never addressed the root cause.
• The fixed frame inside the wall itself has warped, not just the moving sash — in this case a local repair won't last long.

In these cases, ordering a new window at the same size, usually with double glazing, pays off over time in both insulation and avoided repeat repairs. We cover the full tradeoff between wood and UPVC/aluminum profiles in wooden window vs. UPVC and aluminum, for anyone still undecided between materials.

Check for termites first, before any decision

Before deciding anything, inspect the window frame for termites and wood-boring insects; paint that looks perfectly intact can hide a network of termite tunnels underneath. We cover the symptoms and how to spot them in termites and wood pest prevention — if that's the case, a surface repair won't help and the problem needs to be treated more seriously.