Police tweeted the warning this morning
The pair, who are both described as white men, have been working together to steal valuable items from residents.
The first man takes victims into their garden to discuss work, while the second person enters their home and takes their possessions.
Police are urging residents to be vigilant.
Tags: Havering@lbbdcouncil @metpoliceuk @DIYStreetsLBBD @Time1075_fm @RedbridgeLive @RedbridgeNHW @RedbridgeNHW EA3350 pic.twitter.com/mlEUbcyxgd
— Barking & Dagenham Police (@MPSBarkDag) October 1, 2019