A large number of power tools and machinery have been stolen from a site in Southwaite.
Police are investigating the burglary, which happened on Monday, January 31, between 3am and 3.50am.
One suspect is described as wearing black trousers, a dark blue hoodie underneath a black jacket, and a black balaclava.
A dark saloon vehicle is thought to have been used.
Anyone with information can report online at www.cumbria.police.uk/reportit – quoting incident 37 of January 31 or call 101.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.