Individual allotment insurance

Hi folks,

Not thinking about group or liability insurance here but individual insurance against things like theft from a shed. Is this a "thing", does it exist? Seems to be quite hard to find any info on this. My household insurance definitely does not cover this.  Totting up the value of all the tools adds to quite a sum, maybe it would be better to put aside a certain amount of money each month instead and assume that we would get broken into at some point