Not every chip or crack means a full window replacement — here's how to work out what your glass actually needs.
A small surface chip, particularly on a single pane rather than the outer pane of a sealed double-glazed unit, can sometimes be filled and stabilised by a specialist glass repair technician using resin injection, similar to windscreen repair. This works best on chips smaller than a coin and away from the edge of the pane, and prevents the chip from spreading into a full crack.
Once a crack has formed and travelled across the pane, resin repair is not a reliable long-term fix, particularly in a load-bearing window frame subject to wind pressure and temperature changes. A cracked pane compromises the structural integrity and, in a sealed double-glazed unit, will let moisture and air into the gap, leading to misting even if the crack itself doesn't spread further.
If the crack is in the outer pane of a sealed unit, the inner pane and gas fill may still be intact, meaning only the whole sealed unit needs replacing rather than the entire window frame — this is significantly cheaper than a full window replacement and is the standard approach for isolated pane damage in an otherwise sound frame.
Building regulations require toughened or laminated safety glass in critical locations — within 800mm of floor level, in and around doors, and in door side panels. If your cracked pane is in one of these locations, replacement glass must meet the current safety standard even if the original glass predates the regulation.
A cracked pane should not be left indefinitely, particularly in cold or wet weather, as moisture ingress can worsen the damage and create a security weakness. Purpose-made security film or, in an emergency, boarding can offer a short-term stopgap, but book a proper glass replacement as soon as possible rather than relying on a temporary fix.
Small isolated chips can sometimes be stabilised with resin repair, but a full crack cannot be reliably repaired and should be treated as needing pane replacement, particularly in a sealed double-glazed unit.
Usually not — if the frame is sound, only the glass unit itself needs replacing, which is considerably cheaper and quicker than a full window replacement.
It can be, particularly in doors or low-level windows where safety glass is required by regulation. Cracked glass in these locations should be treated as a priority repair.
As soon as reasonably possible — a crack can worsen with temperature changes or impact, and in a sealed unit it allows moisture in, which leads to misting even before the crack spreads further.
Black mould on window frames is a moisture problem, not a cleaning problem — here's how to find the real cause.
Perished rubber gaskets are a common, often overlooked cause of draughts, noise and even damp around windows.
If traffic or street noise is a constant background hum, the glass specification in your windows matters more than you'd think.
A window that won't lock is a security risk — most causes are mechanical and fixable without replacing the whole unit.
A snapped door handle is one of the most common uPVC door faults — and one of the quickest to fix correctly.
A door that scrapes the frame or is hard to lock hasn't broken — it has simply dropped, and it can usually be adjusted back.
Send us a photo of the damage and we'll advise whether it's a pane replacement or a wider window check that's needed.
