Fire crews spent more than an hour battling a house fire.
Crews were called to the first-floor blaze in Hangleton Way, in Hangleton, Hove about 5pm today.
Witnesses described heavy smoke and flames were pouring out of the upstairs window.
A spokesman for East Sussex Fire and Rescue said: "There is significant damage to the first floor of the property. We are still investigating the causes of the blaze."
He also confirmed the family who occupied the property had evacuated the building before they arrived.
A fire investigation unit and officers from Sussex Police also attended the scene.
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