Tighter restrictions on housing around Sydney's airports due to a new way of measuring aircraft noise have been cast aside after pressure from developers.

Under recently released long-term plans, councils and state-agencies were forced to take into account tougher federal noise metrics when considering plans for developments around the proposed Western Sydney Airport at Badgerys Creek, and Kingsford Smith Airport at Mascot.

The new airport at Badgerys Creek will operate 24 hours a day, unlike Sydney Airport which has a night-time curfew. Credit:Katherine Griffiths

But in the wake of lobbying from developers, the NSW government said the Commonwealth's approach to planning for noise around airports had not been adopted.

Property developer group Urban Taskforce has lobbied against the inclusion of the tighter federal restrictions in the city's district plans, warning it could stop construction of new housing across an extra 240 square kilometres around the new Western Sydney Airport.