Kainga Ora's staying tight-lipped on how much it'll cost to carpet state homes in Kiwi wool.

The Government's mandating using woollen fibres in new homes where appropriate from next month - to support the industry.

The same will apply to new state buildings like schools and public service offices. 

Kainga Ora chief executive Matt Crockett says he can't reveal the exact price because of of commercial sensitivities, but it's not expensive.

"Basically, it's cost-neutral - but wool's a great product and we were really pleased with the pricing that came back."

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