Households in Molonglo and Lawson paid prices at least $100,000 higher than they should have for their land, new figures suggest.

Former senior ACT Treasury official Dr Khalid Ahmed said the economic value of the first blocks sold at Wright in 2010 was $510 a square metre. Households had paid $740 a square metre in the first auction, which had set the prices to follow for the entire suburb.

Wright, in Molonglo, being developed in 2013. Credit:Graham Tidy

The 530-square-metre blocks were worth $280,000 on Dr Ahmed's analysis. People paid $380,000.

He has similar stark figures for the 2014 sale of land in Belconnen's newest suburb, Lawson. The price paid asquare metre in Lawson was $900, against an economic value of about $610. With average block sizes of 463 square metres, Lawson households paid about $130,000 more than they should have.