Police have stepped up patrols in Southwick and Fishersgate following a spate of burglaries.
Sussex Police said thieves had broken into six properties in the area since 18 October, mainly during the day.
Two of the burglaries took place on the Seaview estate, two in Gardner Road and one in The Gardens and Eastbrook Way.
The burglars took car keys from one of the properties and stole a vehicle parked outside.
Det Con Katy Lewis said: "We are doing everything we can to make sure that this series comes to an abrupt halt."