Is it safe to go back into the house after a fire?

Only when the fire service has released the building, and even then treat it as a short, equipped visit rather than as moving back in. Wear an N95 or better, gloves, and closed shoes, keep children and pets out entirely, and do not stay longer than the errand takes.

A building that has burned is not simply a dirty version of the building it was.

What makes it unsafe, in rough order

Structure. Charred timber has lost cross section and strength, and the damage is often worst where it is least visible: inside a wall, above a ceiling, under a floor. A floor that feels normal can be spanning burned joists.

Water. Firefighting puts a great deal of water into a building, and ceilings hold it. A saturated ceiling comes down all at once. What to do about a ceiling holding water.

Electricity. Wiring damaged by heat can still be energized and can fail in new ways. Do not switch anything on. Assume the system needs inspection before it is used again.

Air. Smoke residue contains combustion products from whatever burned, which in a modern house means a great deal of plastic. Fine particulate stays airborne and gets disturbed by movement. This is why the mask is not optional.

Hot spots. Fires restart. Material inside a wall or in insulation can smolder for many hours after the visible fire is out, which is exactly why the fire service does not leave when the flames stop.

When they say it is safe, ask three more questions

The fire service releasing the scene means the fire is out and the immediate danger has passed. It does not always mean the building is habitable. Ask:

1. Is the structure safe to walk in, and is any part of it not?
2. Have the power and gas been isolated, and by whom?
3. Does the building department need to inspect before anyone re-occupies?

Write down the answers and who gave them.

Equipped, and briefly

If you are going in for documents, medication, or the contents inventory:

• N95 or better. A cloth mask does nothing here.
• Gloves, long sleeves, closed shoes, and eye protection.
• A flashlight, because the power is off and should stay off.
• Someone who knows you are in there.
• Nothing eaten or drunk inside, and hands washed properly afterwards.
• Clothes worn inside washed separately.

Do not take children or pets in for any reason, including to look.

What to bring out

Documents, medication, keys, cards, phones, and anything small and irreplaceable that is reachable.

Not soft furnishings, not clothing you intend to wear before it is cleaned, and not food. Food exposed to smoke or heat is not salvageable, including sealed packaging and anything in a fridge that has been without power.

The parts that decide habitability

The building can be structurally sound and still not livable. What usually decides it:

• Is there power and safe wiring?
• Is there running water and a working bathroom?
• Is there heating, in a season where that matters?
• Is the smoke residue at a level where a person could sleep there?
• Has the water from firefighting been dealt with, or is the place now on the clock for mold as well as smoke?

If the answer to any of those is no, the house is uninhabitable and that has a specific meaning in your policy. What that pays for.

Do not sleep there to guard it

It comes up, particularly where a building is open and there is a fear of theft. Board up and temporary fencing are normally covered by the policy, and that is what they are for. Sleeping in a smoke damaged building to protect belongings trades a real health exposure against a risk the insurance already carries.

The short version

Wait for the fire service to release it, then treat re-entry as a short equipped errand. N95, gloves, flashlight, no children, no pets. Switch nothing on, especially not the heating or air conditioning. Ask whether the structure is safe, whether the utilities are isolated, and whether the building department needs to inspect.