ABC

The Federal Opposition says the Government has demolished more public housing units than it has built under its economic stimulus package.

The Government announced in February it would spend almost $5.5 billion building new social housing and refurbishing other homes.

The Opposition's housing spokesman, Scott Morrison, says as of late last month only 73 new houses had been completed.

But he says hundreds have been demolished to make way for new homes.

"The Government needs to be accountable for this spending, they need to tell people what is being done, they need to know how many houses they're knocking down, and they need to be able to justify that this is value for money," he said.

"There are very serious questions now being raised about how many homes will end up being delivered."

But Housing Minister Tanya Plibersek says more than 2,500 homes are under construction and thousands of others have been refurbished.

"Where homes are being knocked down the properties were in such poor condition that they were sitting vacant in many cases for years," she said.

"The repairs and maintenance part of this program has been successful, it has exceeded our expectations, and the new building part of this program is absolutely on track to meet our target of 75 per cent of these new homes to be completed by the end of next year."

She says more than 19,000 new homes will be built under the package.