There's concerns not all landlords will comply with the Healthy Homes standards set to kick in tomorrow.

New rental compliance standards for heating, insulation, ventilation, and moisture in rental properties will come into effect from July 1.

NZ Green Building Council CEO Andrew Eagles says it's likely a significant percentage of homes won't meet the standard by the deadline.

"There's been an awful lot of assessments and work and I know that many are pushing to get it done in the final month, which is a real shame, because lots of people are booked up."

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