Brooking said insurance firms would not insure the cars, so he could only claim for the tools, machinery and property damage.
Soon, break-ins were up to four times each week, and police action was not deterring thieves, he said.
"We called the police quite a few times and a couple of times they came out a couple of days later. One time they ... set a trap by putting some powder on some wheels.
"The wheels went missing of course, and we got some information about them but they never followed it up. We stopped calling the police because they weren't doing anything, or couldn't do anything, about it."
Brooking said the thefts cost him $8000 between January and June 30 for repairs and replacement items, but the crimes also cut into his profits by thousands of dollars a week.
Originally from Auckland but still living in Rotorua with his partner, the 40-year-old said the end of his business also meant he had to lay off three full-time employees and a part-time bookkeeper.
"The staff have done nothing wrong, I have done nothing wrong but we are the ones who lose out."
Police were unable to comment before the Herald went to print.