Thieves stole two Ford Transit vans during the same night.
And police believe the thefts, which happened on Monday, could be linked.
One the vans was taken sometime between 2am and 2.30am from Castleford Road, Normanton.
The vehicle contained tools and building equipment.
The other van was stolen sometime between 1am and 6.50am from Hanson Avenue, Normanton.
A West Yorkshire Police spokesman said they are looking at possible links between the two incidents.
Anyone any with information should contact police on 101 or Crimestoppers anonymously on 0800 555111.