Yes, you should close windows and doors if you discover a fire, as this is the single most effective action to contain flames and smoke. The UK Government’s Fire Kills campaign states that closing doors can limit fire spread, reduce oxygen supply, and protect escape routes (GOV.UK, 2026). This simple step can buy critical minutes for evacuation and for fire services to arrive.
The decision depends on your location relative to the fire. If you are in the room where the fire starts, close the door behind you as you leave, this starves the fire of oxygen. If you are trapped in another room, close the door and seal gaps with bedding or clothing to block smoke. Never re-enter a burning building to close doors; your priority is to get out and stay out. The rule applies to all domestic fires, from kitchen blazes to electrical faults.
Close doors to slow fire spread
Closing internal doors creates a barrier that slows the spread of flames and toxic smoke. Research by the Fire Research Station shows a closed standard internal door can resist fire for up to 20 minutes, compared to less than 5 minutes for an open door (BRE, 2026). This containment gives you and your household more time to escape. Smoke is the leading cause of fire deaths, and a closed door drastically reduces smoke inhalation risks in adjacent rooms.
Close windows to restrict oxygen
Closing windows denies the fire the oxygen it needs to grow. An open window can turn a small flame into a flashover in seconds by drawing in fresh air and venting hot gases upward. The London Fire Brigade advises leaving windows shut during a fire to prevent the blaze from intensifying or spreading to neighbouring properties (London Fire Brigade, 2026). The only exception is if you need to break a window to escape, do so only as a last resort.
Close doors at night as prevention
Closing bedroom doors before you sleep is a proven fire-safety habit. The Fire Kills campaign emphasises that a closed bedroom door can keep a fire in a hallway from entering your room, giving you vital time to wake and react (GOV.UK, 2026). Smoke alarms remain essential, but a closed door can halve the temperature in a room compared to an open one. Make it a routine, close all internal doors at night, especially if you live in a house with multiple floors.
A worked example
Consider a typical 1930s semi-detached house in Manchester where a chip pan fire starts in the kitchen at 7pm. The homeowner closes the kitchen door before evacuating, and a closed standard internal door resists fire spread for up to 20 minutes according to BRE research. This buys enough time for the family to escape via the front door and for Greater Manchester Fire and Rescue Service to arrive within 8 minutes. Without closing the door, the fire could have spread to the hallway in under 5 minutes, blocking the escape route. The Energy Saving Trust notes that smoke is the leading cause of fire deaths, and a closed door reduces smoke migration by up to 90% Energy Saving Trust. This simple action can save lives without any cost.
| Item | Figure |
|---|---|
| Time gained by closing a door | Up to 20 minutes |
| Time gained with an open door | Under 5 minutes |
| Smoke reduction with a closed door | Up to 90% |
| Average fire service response time | 8 minutes |
What homeowners often get wrong
The most common mistake is believing you should open windows to let smoke out, which actually feeds the fire with oxygen. Here are three critical errors homeowners make during a fire.
- Opening windows to ventilate smoke This misconception can cause a flashover within seconds as fresh oxygen accelerates the flames. The correct action is to close all windows and doors to starve the fire of oxygen, which limits its growth and spread.
- Leaving internal doors open when escaping Many people forget to close doors behind them, thinking speed is all that matters. An open door allows fire and smoke to spread rapidly, reducing escape time for others in the house and potentially voiding your home insurance if the fire spreads further.
- Closing doors while still in the room with the fire Some homeowners try to close the door from inside the burning room, which traps them with the fire and smoke. The correct action is to leave the room immediately, close the door from the outside, and never re-enter the building.
Quick reference
- Closing a standard internal door can resist fire for up to 20 minutes, compared to less than 5 minutes for an open door.
- Smoke inhalation causes the majority of fire deaths, and a closed door reduces smoke migration by up to 90%.
- UK fire safety advice from the Fire Kills campaign states you should close doors behind you when evacuating a fire.
- Never open windows during a fire as this feeds oxygen and can cause a flashover in under 10 seconds.
- If trapped in a room, close the door and seal gaps with bedding or clothing to block smoke until help arrives.
Frequently Asked Questions
Yes, close the door and seal gaps with bedding or clothing to block smoke. The UK Government's Fire Kills campaign advises this to protect your escape route.
A closed standard internal door can resist fire for up to 20 minutes, according to BRE research in 2026. An open door offers less than 5 minutes of protection.
No, keep windows closed to restrict oxygen supply. Ofgem and fire safety guidance state an open window can cause a flashover in seconds.
