How do you know if your house was struck by lightning?

01

What does a direct strike sound like?[1][2]

Flash and thunder arrive together with no countable gap, and the sound is a sharp crack or bang rather than a rolling rumble. The rumble only develops over distance, so a strike on or beside the house has no time to spread into one.

The zero delay is the most reliable indicator available at the time. If you can count at all, even one second, the strike was several hundred meters away rather than on the structure.

People frequently describe an explosive crack, a simultaneous whole-house jolt and lights flickering or failing at the same instant. A nearby strike shakes the house through the pressure wave without any of the electrical symptoms.

02

What physical marks should you look for?[3]

Look for entry and exit damage at the highest points. Displaced ridge tiles, cracked or blown-out chimney masonry, split fascia boards, scorched aerials and pitting on metal fittings all mark where current entered or left.

Ground damage counts as evidence too. A strike to a tree in the garden can leave a scar down the trunk and disturbed turf radiating outward, and current from that tree can enter the house through buried services.

Roof ridge and chimney

The usual attachment points. Look for missing tiles and blown mortar

TV aerials and satellite dishes

Melting, pitting or a burnt cable at the entry point

Scorch marks

Around outlets, at the panel, on exterior walls near downpipes or gutters

Split or blown-off timber

Fascia, barge boards and structural timber can be split by steam pressure

Damaged gutters and downpipes

Metal rainwater goods often carry current and show burn marks at joints

03

What are the electrical symptoms?[4]

Multiple unrelated devices failing simultaneously is the strongest indicator. A single dead appliance is ordinary failure. A dead router, oven control board, garage opener and thermostat on the same night is a surge event.

Failures cluster around whatever entry path the surge used. Devices on the incoming cable or phone line often fail while mains-only devices survive, and the pattern of what died usually points at how the current got in.

Partial failures are common and confusing. Ethernet ports that no longer link, a TV that powers on but has lost HDMI inputs, a heat pump that runs but ignores its thermostat: these are all classic surge signatures rather than coincidence.

04

Can you confirm it with strike data?[5]

Partly. Detection networks archive the time and position of located strikes, so you can check whether a flash was recorded near your address that night. Position error of a few hundred meters to a couple of kilometers means it corroborates rather than proves.

For insurance purposes that corroboration is often enough, particularly combined with physical evidence and an electrician's report. It establishes that lightning was present at the location and time you are describing.

Be aware of detection efficiency when the archive shows nothing. Networks miss a fraction of flashes, and a missing record is weaker evidence of absence than a present record is of occurrence.