Three fire engines rushed to Oakcroft Gardens at about 6.30pm following ‘multiple calls’ about a vehicle fire.
Once on the scene, crews found a van on fire, with the flames having spread to an adjoining house.
A spokesperson for West Sussex Fire & Rescue Service said: "Upon arrival crews found one van well alight and the fire had spread to an adjoining house.
"Firefighters wearing breathing apparatus extinguished the fire using three high pressure hose reels, a jet and a thermal imaging camera.
"Fortunately there were no casualties.
"The cause of the fire is unknown at this time."
1. Van fire spreads to house in Littlehampton
Photo from the scene Photo: Eddie Mitchell
2. Van fire spreads to house in Littlehampton
Photo from the scene Photo: Eddie Mitchell