Tools worth more than £2,000 were stolen from the inside of a white Mercedes van in Accrington yesterday.
The theft occured between 7.45am and 3.26pm on Tampits Road while the victim repaired a house nearby.
Sargeant Simon Holderness from Accrington Police Station, said: "The victim has been working nearby doing house repairs.
The offender has punctured the sliding door lock with a screwdriver and stolen a generator, a tool safe - which apparently is a two-man lift - and tools, all together worth £2,500 in total. We found drag marks on the pavement which suggests the items have been dragged to the offenders vehicle nearby."
Anyone with information regarding this incident can contact police on 0845 125 35 45 or Crimestoppers on 0800 555 111.