Overnight haul includes a trailer and two generators, say police.
Around £12,500 in tools and plant hire equipment was stolen from a South Molton premises overnight on May 30-June 1.
Police said the equipment was stolen from a storage container on a premises next to Rock and Rapid.
The haul included an Ifor Williams tri-axle trailer, two generators and concrete breakers.
Anyone with information is asked to call 101 or Crimestoppers on 0800 555111, quoting CR/037883/15.