Emergency glazier London: what to do when a window breaks
Last updated: 28 September 2026
Move people and pets away from the damaged area, keep clear of loose shards and avoid trying to pull large pieces from the frame. If the opening is exposed, treat safety and security as the priority before thinking about permanent replacement glass.
What should you do immediately after a window breaks?
A broken pane can leave sharp edges, loose fragments and an unsecured opening. Close the room off if possible, wear shoes rather than walking barefoot nearby, and do not put hands through the frame to remove hanging glass. If there is an immediate danger, serious injury, fire or crime in progress, use the appropriate emergency service first. For a glazing enquiry, call with the property postcode and explain what has broken, whether the opening can be secured and whether glass is still loose in the frame.
Should you clear up broken glass yourself?
Only deal with small, clearly accessible fragments if it can be done without approaching unstable glass. Large shards, overhead panes, cracked doors and heavily fractured windows are better left for a professional make-safe assessment.
The main risk is assuming that glass which still appears attached is stable. Toughened glass may fragment into many pieces, while laminated glass can remain together but still contain sharp edges and considerable weight. Do not lean on the pane, pull at cracked sections or use improvised force on the frame. Keep children and pets away, and use a barrier or closed door to isolate the area. A photograph taken from a safe distance can help explain the problem without requiring you to handle anything.
When is boarding up needed?
Boarding is a temporary security and weather-protection measure when permanent glazing cannot be completed immediately. It is useful when glass must be made to measure, the correct specification is not available at once or the opening is too unsafe to leave exposed.
The board should be treated as temporary, not as a finished repair. The way it is secured depends on the frame, surrounding material and the location of remaining glass. A stable board can protect the property while measurements are confirmed and replacement glass is ordered. If the damage is to a shopfront or entrance used by the public, the temporary arrangement also needs to consider pedestrian safety and access around the opening.
What information should you give an emergency glazier?
Provide the exact postcode, the type of opening, approximate size if it can be measured safely, whether the glass is single or double glazed if known, and clear photographs of both the damage and the whole frame.
It also helps to explain the frame material—such as timber, uPVC or aluminium—and whether the broken glass is in a door, window or shopfront. Mention upper floors, restricted access, communal entrances or anything that may affect handling. These details do not replace a final measurement, but they make the first conversation more useful and reduce the chance of planning the wrong response.
Can replacement glass always be fitted on the first visit?
No. Some replacement panes can be completed quickly when the correct material is available, but made-to-measure double-glazed units, specialist safety glass and larger commercial panels usually require accurate measurement and manufacture before fitting.
The permanent replacement must match the opening and relevant specification. Guessing the thickness or using an unsuitable pane simply to avoid a second visit can create further problems. Where the correct glass is not immediately available, the practical sequence is make safe, protect the opening, confirm the specification and return with the manufactured replacement.
How much does emergency glazing cost in London?
There is no honest flat rate for every emergency glazing job. Cost depends on size, glass type, safety specification, access, whether temporary boarding is required and whether the replacement is a standard pane or made-to-measure unit.
M25 Glazing does not publish an invented average. Pricing is confirmed from the actual opening and work required. Once the business confirms real pricing ranges, they can be added here with clear conditions. Until then, the most accurate approach is to quote from the actual opening and required work. For more detail about the service itself, see the emergency glass replacement page.
What safety guidance applies to glazing?
Glazing in locations where people may collide with it can be subject to safety requirements, so the correct replacement specification matters as much as the dimensions. UK Approved Document K contains guidance on protection from impact in buildings.
For public reference, see the UK Government publication Approved Document K. A glazier should still assess the actual opening rather than treating a general guide as a substitute for project-specific specification.
Related services and local pages
If the breakage is urgent, start with the emergency glass replacement page. If the issue is misting rather than breakage, use the double glazing guide and service page instead.