The actions in order
Thirty seconds are enough for the first four.
- Create no spark: no switch, no doorbell, no extractor hood, no lift.
- Close the gas shut-off valve (near the meter or the appliance).
- Open doors and windows to ventilate.
- Evacuate the home and warn neighbours by knocking, not by ringing.
- From outside, call Sibelga on 0800 19 400.
What you must never do
Do not look for the leak with a flame, do not relight the boiler to check, and reconnect nothing until Sibelga has been.
Do not use your phone inside the home: go out first, then call.
Who does what in Brussels
The split is strict, and free up to the meter.
- Sibelga: network, connection, meter, making safe (0800 19 400).
- Authorised gas installer: internal system, appliances, recommissioning.
- Fire brigade (112): strong smell, anyone feeling unwell, or doubt about evacuation.
- Building manager: shared flues and boiler room in an apartment block.
Prevention beats reaction
Annual servicing of gas appliances, a CO detector on every occupied floor, ventilation grilles never blocked: in recently insulated Brussels houses, blocking a grille is the most common mistake.
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