Officers are encouraging residents to report any damage following an incident involving quad bikes in Newton Aycliffe on Wednesday night.
Officers were made aware of homes in Silverdale Place being covered with mud, allegedly by quad bikes riders.
Inspector Sarah Honeyman said: “This type of behaviour is totally unacceptable and will not be tolerated.
“This incident was not initially reported to us so I would urge residents to call us if they see anything suspicious.
“A full investigation is underway.”
Any residents who have had damage caused to their properties, or anyone with CCTV or information, should call 101 quoting incident reference 334 of November 11.