The homes will go ahead on lots along Meehan Road without the relevant noise insulation council staff say is necessary for them to meet Australian planning standards.

At least four properties have now been approved under similar circumstances and questions were raised at a recent meeting over the value of the council's aircraft noise policy, given it was being consistently ignored.

"I don't know how many times you can ignore a policy before you lose a policy but we must be getting close," Cr John Nell, who was the only councillor to vote against the approvals, said.

Mark Lidbury, the father of the two brothers who applied for the insulation requirements to be lifted from their properties, addressed councillors at the meeting.

"We have been told it could cost in excess of $30,000 per dwelling and one property is a dual occupancy...so my family is up for $90,000 to abide by these regulations," he told councillors.

Mayor Bruce MacKenzie spoke strongly in favour of the applicants and questioned the accuracy of Department of Defence noise maps that forecast the impact of the Joint Strike Fighter when it arrives in 2018.

"I for one am not going to impose another $30,000-cost on this family," he said.

"No one can convince me these noise maps are not just guess work, we haven't even got the plane yet...we will not know the affect until it gets here."