The Queensland government will scrap laws aimed at making new houses more sustainable, saying the move will boost home affordability.

Laws requiring all new homes to have rainwater tanks and gas, solar or heat pump hot water systems will be dumped next year.

Housing Minister Tim Mander says the cost of building a new home could be reduced by more than $5000.

However, councils can retain mandatory rainwater tank requirements if they can show there's a net benefit to the community.

"These requirements add an unnecessary cost to homeowners and place an unwanted drag on the construction industry," Mr Mander said in a statement on Friday.