Real Estate Institute of Australia president David Airey says conveyancing fees are regulated in some states, while in others selling commissions are monitored and lawyers are required to prepare contracts.

"These things are gradually becoming more nationalised and the sooner they do the better, because consumers moving from state to state won't be faced with such a minefield of different legislation and charges, which can make buying and selling quite confusing,'' Mr Airey says.

"Across eight states and territories we have eight separate purchase types and contracts and eight different consumer regulators. It's a crazy system.''