Parramatta is reaching for the sky with a bid to create a vast no-fly zone over the city so it can build an iconic skyline of tall towers.

The council is calling for a "bubble over Parramatta" so that buildings up to 500 metres high can be constructed without regard to flight paths.

Lord Mayor Scott Lloyd said the vision for the city as a "dual CBD" was being impeded by aviation regulations which restrict buildings to an approximate maximum of about 300 metres, or about 90 storeys.

The restriction includes cranes on top of the building during construction, so the height of the completed structure is lower.