Thousands of lawyers will be asked if they think more matters should be heard in Parramatta as the campaign ramps up to bring the state's highest court to the city.

Those behind the push say the survey will prove there is a clear demand for a permanent, full-time Supreme Court presence in western Sydney.

The Access to Justice for Western Sydney committee says at least one Supreme Court judge should be permanently appointed to Parramatta to hear civil matters.

Access to Justice for Western Sydney chairman and lawyer Geoffrey Roberson said it was a major step forward in the campaign, which started in 2013.

"You've got this massive growth in the greater west and people deserve to have their matters dealt with in the region in which they either work or live," Mr Roberson said.