This does not include stamp duty exemptions or assistance packages of up to $14,000 a family.

The Asbestos Response Taskforce figures show (the ACT government) has made offers on 610 of the 1021 homes affected by Mr Fluffy asbestos.

Offers are averaging $689,000 a property and 397 homeowners have accepted to date. If the average price holds firm the final direct compensation payout will total just under $703.5 million.

"In total 849 of 1021 homeowners have 'opted in' to get valuations undertaken. The scheme is to close on June 30," a taskforce spokeswoman said.

The direct compensation payout is the equivalent of just over a quarter (25.5 per cent) of all house sales in the territory in 2014 by value and more than a fifth (22 per cent) of last year's sales by volume.

Mr Fluffy victims, who say most of their number are committed to buying houses in the ACT before the end of the year, said the program was already artificially inflating house prices at a time when families were tied to October 28, 2014, valuations.

Mike Desmond, who signed up for the buy-back soon after it was announced, said the market was already in a state of flux.

"We bought early and at some financial risk but we ended up with a beautiful new home," he said. "My brother-in-law and his wife are (just) starting the process and their experience, and that of many others, is in many ways worse.

"They are entering a housing market with inflated prices and over-zealous agents who conduct auctions over the phone between Fluffy owners."

While some Fluffy victims claim the ACT government hopes to make a profit from the rezoning and redevelopment of the decontaminated house blocks, a task force spokeswoman said this would not happen.

"The net cost to the ACT community of this program will be in the order of $400 million," she said. "There is not a realistic combination of factors that will turn this into a profit."

"The scheme is at the edge of affordability. The ACT community is purchasing these houses at full market value overlooking that they are affected by loose fill asbestos.

The redevelopment of the Mr Fluffy blocks, which should yield more than 2000 medium and high density home sites over time, won't ease the "land drought" caused by the Land Development Agency's current lack of build-ready land.

"Acquisition of the (Fluffy) sites has commenced with clearing to commence shortly," the spokeswoman said.

"The buy-back and demolition program has always been foreshadowed as a five-year program, therefore conclusion would be 2020."

Individual valuations for Fluffy blocks range from $3 million to just $360,000 for a property in Belconnen.

"This was a small, single level, free-standing property with close to 110 square metres of living space," the spokeswoman said.

While many owners are satisfied with the valuations, there is concern at having to "sell" at a point in the property cycle not of their choosing.

"I can't see anyone who plans to move not entering the market in the next month, two at the latest," Mr Fluffy victim Ray Collins said.

"Not having a knock-down, rebuild option has created price bubbles in specific neighbourhoods because they have similar sized blocks (to what people are leaving) and people want to stay in their neighbourhoods.

"Sellers are pushing for higher prices and the vast majority of listings this year in sought-after areas are now auctions. Non-Fluffy owners who planned to sell are making hay while the sun shines.

"People have made long-term investments in their homes that are not being realised by short-term selling."