East Sussex Fire and Rescue Service were called at 00.50 on 13 January to reports of a fire at a property on Kings Drive, Eastbourne.
Four fire engines from Eastbourne, Pevensey and Hailsham were in attendance using the Aerial Ladder Platform and hosereel jet to extinguish the fire.
Crews worked hard throughout the night and a reinspection took place at 07.25am where thermal imaging cameras were used to check for hotspots.
As of 9.01am all firefighting operations were complete and the incident was left with Sussex Police.
There were no casualties reported.
A further reinspection has taken place this morning and the incident has been left with Sussex Police and Building Control.
The cause of the fire is under investigation.
UPDATE from Sussex Police: Witnesses sought following house fire in Eastbourne | Sussex Police
Police are now working with the fire service to investigate the cause of the fire, and officers are keen to speak to anyone who may have seen what happened or witnessed any suspicious behaviour in the area around that time.
They would particularly like to hear from anyone who may have captured any relevant doorbell, dash cam or CCTV footage.
Information can be reported online or by calling 101, quoting serial 21 of 13/01.