A fire broke out in the roof of a house caused by electrical equipment.
Firefighters were called to the blaze in Trinity Road, Wandsworth, at about 8.20pm.
The blaze began in a loft where building work was taking place.
A family, including three children, were evacuated from the building to a neighbour's house.
Nobody was injured during the incident.
Fire crews were able to put it out within 30 minutes.
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