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A broken window leaves more than a mess. It can leave your home, flat, shop or office exposed to rain, cold, opportunistic theft and further damage. If you are searching for how to board broken window damage after an accident or break-in, the priority is to make the area safe and secure it properly until the glass can be replaced.
Boarding is a temporary measure, not a substitute for a proper repair. Done carefully, however, it can protect your property and give you breathing space to deal with insurers, landlords or a glazier without leaving a vulnerable opening overnight.
Make the area safe before boarding
Do not rush straight to the window with a sheet of wood. Broken glass can travel further than expected, particularly after an impact, and small pieces are easily missed. Keep children, pets, customers and anyone not helping well away from the area.
Put on sturdy gloves, safety glasses and closed shoes with a solid sole. If there are loose shards still in the frame, avoid pushing or pulling them with bare hands. Carefully remove only the pieces that are clearly loose and within safe reach, placing them in a rigid container such as a bucket or strong cardboard box. Do not use a thin bin bag, as glass can split it.
Sweep the immediate area thoroughly, then vacuum if possible. Check both sides of the window, including the windowsill, nearby furniture and the ground below. If the glass is on an upper floor, do not lean out to clear it or attempt a repair from a ladder in poor conditions.
If there has been a break-in, avoid unnecessarily touching the frame, handles or items around the window until you have considered whether police evidence may be needed. Take clear photographs of the damage first. They can help with an insurance claim and show the condition of the property before temporary boarding is fitted.
How to board a broken window safely
The best approach depends on whether the window is timber, uPVC, aluminium or set directly into brickwork. The aim is to cover the opening with exterior-grade plywood and fix it to a sound surrounding surface, without causing unnecessary damage to the window frame.
For most ground-floor domestic windows, use plywood at least 9mm thick. A larger opening, exposed location or commercial property may need 12mm plywood for a more secure temporary cover. Thin hardboard, cardboard and plastic sheeting can keep out a light shower for a short time, but they will not provide meaningful security.
Before starting, gather the right equipment:
- Exterior-grade plywood, ideally 9mm to 12mm thick
- Tape measure, pencil and handsaw or circular saw
- Safety glasses, gloves and closed footwear
- Suitable screws, washers and a drill or screwdriver
- A brush, vacuum and rigid container for broken glass
- A dust sheet or tarpaulin to protect the floor and catch debris
Measure the opening from the outside edge of the frame or reveal, not simply the missing pane of glass. The board should overlap the opening by at least 50mm on every side where there is a secure surface to fix into. This overlap makes it much harder to pull the board away and helps keep wind-driven rain out.
Cut the plywood to size, then hold it in position before drilling. Check that it sits flat and does not interfere with a nearby door, shared access route, alarm sensor or escape window. For a window that may be needed as a fire escape, do not create a barrier that traps occupants inside. In that situation, seek urgent professional advice rather than simply screwing a board over the opening.
Where possible, fix the plywood into solid timber surrounding the window or into a suitable masonry reveal. Use screws rather than nails, as screws give a firmer hold and are easier to remove once repairs are arranged. Washers can help prevent screw heads pulling through the plywood, especially in wet or windy weather.
Avoid drilling through a uPVC window frame unless you are certain it is necessary and understand the construction. uPVC frames can contain reinforcement, drainage channels and locking components, and poorly placed screws may create a more expensive repair. It is often safer to fix the board to the surrounding brickwork or use a professional emergency boarding service that can assess the best fixing points.
Once the board is fitted, gently test it from inside if safe to do so. It should not rattle, bow dramatically or leave a gap large enough for a hand to reach through. Tape can be applied around small edges to reduce draughts and water ingress, but tape should support the boarding, never replace secure fixings.
Protect the property once the window is covered
A boarded window solves the immediate exposure, but it does not automatically restore security. Check whether the broken pane has damaged the handle, hinges, locking mechanism or surrounding frame. If the window can still be opened from outside, or if access through the damaged area is possible, the property remains at risk.
Move valuables away from view, particularly items near the window such as laptops, keys, tools and stock. Close internal doors to limit heat loss and prevent people walking into any overlooked glass. If water has entered, dry the area promptly to protect flooring, plaster and electrical equipment.
For a business, make a written note of the incident, photograph the temporary repair and notify the appropriate manager or landlord. If the board affects customer access, visibility or a fire route, put a clear plan in place before reopening. A temporary board may be acceptable overnight, but it is rarely suitable as a long-term solution for a public-facing premises.
Common mistakes to avoid
One common mistake is using whatever material is at hand without considering security. A taped-up sheet of plastic may stop rain for a few hours, but it can be cut or pulled away easily. Another is fixing boards only into the thin window frame. This can split timber, damage uPVC or leave the board vulnerable to being forced off.
It is also tempting to clear every last piece of glass immediately. Do not take risks with awkward fragments, glass above head height or pieces embedded in a damaged frame. The same applies to working on upper-floor windows, large shopfronts or double-glazed units with extensive damage. A fall or serious cut will turn an already stressful incident into something much worse.
Finally, do not delay arranging a permanent repair. Damp can affect boards and surrounding finishes, while a boarded window can make a property look vacant. Replacement glass and any damaged locks or window hardware should be assessed as soon as practical.
Tenants, landlords and insurance considerations
If you rent your home, tell your landlord or managing agent promptly, even if you have successfully secured the opening yourself. Most tenancy agreements require damage to be reported, and the landlord may need to approve permanent repairs. Keep receipts for any emergency materials and take photographs before and after boarding.
Home and business insurance policies vary. Insurers commonly expect reasonable steps to prevent further loss, which is one reason secure temporary boarding is sensible. Report the incident as soon as you can, especially after a suspected burglary, and ask whether they require a particular repair process or evidence before replacement work begins.
When to use an emergency boarding professional
DIY boarding can be practical for a small, accessible ground-floor opening when you have the right tools and a safe fixing surface. It is not the best choice for every situation. Call for urgent help when the frame is badly damaged, the opening is large, glass is still unstable, the window is above ground level or the property cannot be secured without affecting a fire escape.
Professional help is also worthwhile after a break-in, where the window lock or frame may need attention as well as new glass. A locksmith can assess the immediate access risk and secure vulnerable doors or windows while the glazing repair is arranged. For homeowners and businesses in Bromley and nearby areas, SJ Locksmiths Bromley can provide emergency boarding with calm, direct advice when the situation needs more than a temporary patch.
A well-fitted board is simply a bridge between the incident and a proper repair. Make the area safe, secure the opening without damaging the frame further, and arrange the next step promptly so your property feels like yours again.
