The Government hopes the Commerce Commission drafts report on building supplies will be the first step towards greater competition.
It's found it's too difficult for innovative products to enter the market and expand their share of it.
Submissions from the public will be open until September, the final report will be delivered in December.
Housing Minister Megan Woods says it's the beginning of a longer process.
She says it would be inappropriate for the Government to make any changes without more information.
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