Two building sites have been targeted by thieves Hawkinge and Mersham.
The two incidents aren't being linked by officers, but a warning has been issued for people to be vigilant.
The first incident was a burglary reported to have taken place at a building site in Juniper Way, Hawkinge, between 4pm on Saturday and 7am on yesterday.
The offenders forced entry to a newly-built property and stole two built-in electric ovens.
The second theft happened at a building site in Highfield Lane, Mersham, between 6pm on Friday and 7am yesterday where a quantity of red diesel was stolen from an excavator and a dumper truck.
Police are now appealing for witnesses to the alleged offences.
Inspector Jason Atkinson from Ashford Community Safety Unit said: "Construction sites can be a target for criminals and we would ask people to keep an eye out for suspicious people or vehicles and to report them by phoning us on 101 or 999 if a crime is in progress.
"We would also like to hear from anyone with information about the incidents in Hawkinge and Mersham over the weekend."
Kent Police can be reached on 01843 222289 or call Kent Crimestoppers anonymously on 0800 555111 quoting crime reference number ZY/018054/18 for the Hawkinge burglary or ZY/018250/18 for the Mersham theft.