Thieves have stolen a quantity of electrical wiring from an insecure brick outhouse in Mill Road, Market Rasen.
The theft took place sometime between midday on Friday July 25 and 12.30pm on Monday July 28.
The offenders also attempted to jemmy open a rear window to the ground floor, but were unsuccessful in their attempt.
However, police warned they may return at a later date so asked for residents to be vigilant.
Anyone noticing anything suspicious is asked to call police on 101.