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One home has been "severely damaged" and another has been affected by smoke and heat – in a suspected arson attack.
Firefighters were called to a home in Marsham Street, Maidstone, shortly before 7pm last night.
The fire service said four fire engines responded to reports of a fire in the roof space of a single-storey extension to the property.
A Kent Fire and Rescue Service (KFRS) spokesman said: "Crews wearing breathing apparatus used main jets and high-pressure hoses to tackle the fire.
"One home was severely damaged by the flames and another was affected by smoke and heat.
"There are no reports of any injuries and the cause, which is believed to be malicious, will be investigated with KFRS passing information to Kent Police."
An electrical safety engineer from UK Power Networks was also called to the blaze, along with police.
Fire crews left the scene at about 8.45pm.