Windows · Service

Window repair — what is actually fixable

Sashes that will not stay up, cranks that spin, locks that miss, frames that have started to rot. Which of those is a cheap fix, which is not, and when the parts simply do not exist any more.

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In short

What is window repair?

Window repair covers the mechanical and frame faults that stop a window working: balances and sash cords, cranks and operators, locks and latches, weatherstripping, and rot in wood frames. Most of these are inexpensive on a window whose parts are still made. The thing nobody tells you before you pay for a service call is that on many vinyl units over roughly fifteen years old the hardware has been discontinued, and no amount of skill substitutes for a part that no longer exists. Fogging between the panes is a separate, glass-only problem.

Triggers

Signs you need window repair

The sash drops when you let go of it, or takes two hands to lift — almost always failed balances or broken sash cords, and one of the cheapest repairs there is
A casement crank turns freely without moving the sash, meaning the operator gearbox has stripped
The lock no longer lines up with its keeper, which usually means the sash has sagged rather than the lock having failed
Wood is soft at the bottom corners of the sash or at the sill, where water sits longest
Cold air moves past the meeting rail rather than merely coming off the glass — that is worn weatherstripping, not a dead window
The window opens but will not stay open, will not close fully, or binds diagonally in its frame

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The job

How window repair actually works

Diagnosis, and identifying the window

A competent repair visit starts by working out who made the window and when. There is often a stamp in the balance channel, on the spacer between the panes, or on a sticker in the jamb. That identification decides whether parts exist.

Watch for: A visit that never looks for the manufacturer stamp and moves straight to a replacement quote. Identifying the unit takes two minutes and determines everything that follows.
Sourcing the part

Balances, operators, locks, keepers and weatherstrip are largely generic-by-profile rather than universal. A specialist repair firm carries or can match most common profiles; a replacement-window company generally does not.

Watch for: Being told a part is unavailable without the manufacturer or profile ever being named. Sometimes that is true. It is checkable, and it should be checked in front of you.
The repair itself

Most hardware work is done in place in under an hour per window. Wood rot repair is different: sound material has to be cut back, the void filled with an epoxy consolidant and filler or a spliced-in section of timber, then primed and painted.

Watch for: Rot filled over without cutting back to sound wood. It looks repaired for a season and comes back, because the moisture path that caused it was never addressed.
Finding out why it failed

Rot means water is arriving from somewhere — a failed exterior seal, a blocked drainage path at the sill, or something above the window. Sagging sashes on several units at once can mean the house has moved.

Watch for: A repair that treats the symptom and leaves the water path. That is the difference between a repair that lasts a decade and one that fails in two winters.
Operation, lock and weatherseal verification

Sashes operate freely, locks engage, balances or hinges hold position, and weatherseals close without daylight. The homeowner is shown what was replaced and what remains a full-window problem.

Watch for: A repair that opens smoothly but no longer seals. Operation without weather performance is half a job on an exterior window.

Money

What does window repair cost?

Hardware repairs — balances, operators, locks, weatherstrip — are typically a modest fraction of what one replacement window costs, and are usually the clear economic choice when parts are available. Wood rot repair varies widely with how far it has spread. The cost guide breaks this down by failure type.

See the full window repair cost guide — by material, size and region →

Straight answer

When window repair is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

The frame is racked or out of square. If the unit itself has twisted in a moving opening, the sash will never seal properly again no matter what hardware goes into it. This is one of the few window faults that genuinely is not repairable.
The hardware is discontinued and the window is a common builder-grade vinyl unit. Once parts are gone, the honest answer is that the repair does not exist. Paying a diagnostic fee to be told this is avoidable — ask on the phone whether they carry or can source parts for your manufacturer.
You are already replacing the windows on that elevation. Repairing a unit you are about to remove is money spent twice. Fix the ones that are staying.
Rot has reached the sill and the framing behind it. Once the structure below the window is involved this stops being window repair and becomes carpentry, and it needs to be priced as such rather than patched.
The only fault is fogged or broken glass. That is a glass job. A glass shop replaces the sealed unit in a sound frame for a fraction of what a window company will quote you, and most homeowners do not realise it is a separate trade with a separate listing.
You called a replacement company for a repair. A repair visit from a business whose revenue is replacement is a sales appointment with a tool bag. That is not dishonest of them — it is what they sell — but it means the diagnosis and the recommendation come from the same party.

Before you sign

What to check when hiring for window repair

Do you repair windows, or do you mainly sell replacements?

The most useful question on the phone, and it decides what your visit will be. Independent repair specialists and glass shops exist in most metros and are a different business from the in-home replacement sellers.
Can you source parts for my manufacturer? The stamp says ___.

Find the stamp before you call — balance channel, jamb sticker, or the metal spacer between the panes. It turns a speculative visit into a yes or no answer before anyone charges you.
Is there a diagnostic or trip fee, and is it credited against the work?

Both practices are normal. What matters is knowing which one applies before the van arrives, and getting it in writing if it is credited.
Will you repair one window, or is there a minimum job?

Many firms have a minimum call-out. If you have three small faults across the house, batching them into one visit is usually much cheaper than three visits.
For rot: how far back are you cutting, and what are you filling with?

You want sound material reached and an epoxy consolidant and filler system or a timber splice — not filler over soft wood. Ask what happens to the paint finish afterwards too.
What warranty covers the part and the labour?

Hardware repairs are small tickets and warranties are often short or verbal. Get whatever there is written on the invoice, because a balance that fails again in three months should not be a second full-price visit.

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Local pros

Window Repair near you

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Related work

Often done at the same time

Window Glass Replacement

Fogged or broken glass in a sound frame

Window Replacement

When repair has run out of road

Window Installation

What happens when a unit is swapped

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Go deeper

Guides & terms

Guides

Windows decision guides — repair vs replace, DIY vs pro

All windows guides →

Terms on this page

Windows glossary — sash, balance, glazing terms

Full windows glossary →

FAQ

Window Repair — questions people ask

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Is it worth repairing a window or should I just replace it?

Answer it by failure type, not by age. Balances, cranks, locks and weatherstripping are cheap and almost always worth fixing if the parts exist. Wood rot depends entirely on extent. A racked or twisted frame usually is not repairable. And a window whose hardware has been discontinued cannot be repaired regardless of how sound the rest of it is.

Why can’t my window be repaired if the frame is fine?

Because window hardware is not standardised across manufacturers, and manufacturers discontinue profiles. Balances, operators and keepers are matched to a specific channel shape. When a line is dropped and old stock is gone, there is no equivalent to fit. This is the most common reason a structurally sound vinyl window ends up being replaced.

Can I fix a window that won’t stay up myself?

Often, yes — replacing a sash balance is a genuinely approachable DIY job on most single- and double-hung windows, and balances are sold by profile. The hard part is identifying the correct balance, not fitting it. Work with the window closed and supported, because a sash that drops unrestrained will find your fingers.

My windows are draughty but not broken. Is that a repair?

Usually yes, and a cheap one. Worn weatherstripping at the meeting rail and jambs is the most common cause, and it is a replaceable strip rather than a replaceable window. Cold radiating off single-pane glass feels similar and is not repairable — that one is a glass or replacement question.

Does homeowners insurance cover window repair?

Sudden accidental damage — a storm, a falling branch, vandalism — is commonly covered subject to your deductible, which on a single window may exceed the repair. Wear, rot, seal failure and hardware fatigue are maintenance and are not covered. Document the cause with photographs before anything is touched if you intend to claim.