The brazen thieves targeted the premises just a block away from Masterton Police Station.
It appeared they had used a grinding tool or something similar to gain entry to the yard and may have taken advantage of the fact it was Guy Fawkes night to avoid suspicion for noises or bangs that may have been heard by people nearby.
Kaxa's adjacent business building was heavily alarmed and fortified, Mr McTainsh said.
Police were alerted as soon as the break-in was discovered and it is hoped forensic examination could reveal fingerprints or other evidence.
The individual value of the vehicles was $11,000, $13,000 and $13,800 and one of the UTVs was powered by electricity.