It has now been reduced to the least amount of possible car parks to still make the project viable, the application said.

The 288-space car park would be built over six levels at the Launceston Gasworks site.

The original development application was for 400 spaces, but was redesigned after consultation with the council and the Tasmanian Heritage Council to manage the size and bulk of the building.

"The car park has been acknowledged as critical to the future success of the greater precinct development," the DA said.

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Parking bays will be a mixture of pay and display, short and long term leases, and individually-owned bays.

A development application to convert the former gasometre structure into a museum has been already approved.

"The applicant has been incredibly aware of the significance of the industrial heritage and culture of the site and been extremely responsible with providing the capital and resources for the restoration of the significant buildings on the site," the application said.

"The car park is an essential part ensuring these historic buildings remain occupied."

The application is open for comment until December 23.

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