A quarter of buildings inspected under the Federal Government's home insulation scheme did not meet building codes, the Climate Change Minister has revealed.

But Greg Combet, the person charged with fixing the trouble-plagued scheme, says that does not mean buildings fitted with insulation under the program were at risk of fire.

There were at least four deaths and 200 house fires reported before the program was scrapped in February last year.

"What we are talking about is a failure to strictly comply with Australian building codes standards, but that does not mean the same as a fire risk," Mr Combet said.

In the past year around 50,000 homes with foil insulation have been inspected and repaired, and more than 100,000 homes with insulation batts inspected.

Mr Combet says the CSIRO reports that before the insulation program, the risk of fire was 2.4 homes per 100,000 homes.

"The risk of fire under the program has fallen to 2.5 homes per 100,000 - a comparable figure," he said.

The Minister says a risk assessment company retained by the Government has said any more inspections beyond those done now will have no impact on fire risk.

More than 1.1 million houses were insulated under the home insulation program, which cost $1.4 billion.

In terminating the scheme last year, the former minister in charge, Peter Garrett, said audits had shown a risk of dangerous faults in up to 90,000 homes and that poor quality batts were fitted in 180,000 homes.

He blamed "unscrupulous, sometimes illegal and shonky operators" for the problems.

Mr Combet says the Government has worked with the Australian Federal Police in a bid to identify "potential fraudulent conduct" and 35 search warrants were executed recently to gather evidence.

Inspections will continue until the middle of next year.