There’s usually a total cover limit for contents stored in outbuildings. This varies, but typically ranges from £1,500-£10,000, depending on the level of cover you choose.
Limits at the lower end of the scale could easily be exceeded with a few power tools, a set of golf clubs and a lawnmower stored in outbuildings. Loss or damage to valuables such as jewellery, art, antiques, collections and money may be excluded altogether, so check your policy.