Suggestions there could be more misconduct among Crown companies are being shut down by the Minister Supporting Greater Christchurch Recovery.

This comes after a report found the actions of Gerard Gallagher and Simon Nikoloff breached public service standards after they set up a business on the side while employed by Canterbury Earthquake Recovery Authority (CERA).

The private company, PIML, would see investors pay them a fee on private property deals, with buyers thinking they were dealing with CERA.

Minister Gerry Brownlee said this country doesn't tolerate corruption.

He said on suggestions that it is more widespread - that would've been picked up in previous investigations.

"That should not detract from the great work that so many people did for CERA over the years of its existence."

Labour's Canterbury spokesperson, Megan Woods said Mr Brownlee can't just duck for cover.

"There has be a political accountability for what happened under his nose. We have to consider the political culture that's allowed this to occur."

Ms Woods said the fact CERA employees had a serious conflict of interest raises questions over whether it's the tip of the iceberg.

She said there has to be a reassurance this is a once off.

"We need to be sure that we can have faith in the integrity of the rebuild in our city."

The matter's been referred to the Serious Fraud Office.