PHOTO: STUFF – Improving insulation by a small margin does not always bring much of a benefit, the Property Investors Federation says.

Landlords are warning of rent rises on the horizon, after the government passed a law requiring rentals to be warm, dry and well ventilated.

The Healthy Homes Act will require landlords to guarantee that any new tenancy from July 1, 2019 must be either properly insulated or contain a heating source able to make the home warm and dry.  All tenancies must meet the new standards by July 1, 2024.

Andrew King, executive officer of the NZ Property Investors Federation, said landlords were concerned.