The Rent Centre has been ordered to pay more than $34,000 for failing to lodge tenants' bonds and provide evidence of insulation.
The Ministry of Business Innovation and Employment's team that investigates compliance of the Residential Tenancies Act (RTA) found The Rent Centre had breached the law more than 100 times.
"There is no excuse for this behaviour, the company should have known better," said the National Manager of the Tenancy Compliance and Investigations Team (TCIT), Steve Watson.
"The fact that TCIT had discovered 116 breaches of the RTA over a period of four years shows a massive failing in the way this business was operating.
"Tenants need to trust and believe that when they are dealing with a landlord, particularly a property management company that has been in business for over 20 years, that the landlord is fulfilling their legal obligations."