The house occupier escaped safely before fire crews arrived.
Firefighters used a range of equipment to fight the blaze including four sets of breathing apparatus, three fog nails - devices providing fine water mist to promote rapid cooling - two jets and two hydrants.
Sussex Police were also at the scene.
A spokesperson for West Sussex Fire and Rescue Service said the incident was scaled down just before 2.30am yesterday morning with remaining crews checking for hotspots using a thermal imaging camera.
All crews had left the scene by 8.30am on Sunday morning.
A Steyning crew later visited neighbouring properties ‘making sure they have working smoke alarms.’
The fire service spokesperson said that door-to-door house visits were made and fire safety advice offered to local residents.