The Gorge Hotel has been approved by the City of Launceston council, but an appeal is before the Resource Management Planning Appeal Tribunal.

The $50 million, 39.5-metre Launceston hotel would be built on the corner of Margaret and Paterson streets.

On Sunday, the group hopes to use a red balloon to demonstrate the height of the building.

Group spokesman Jim Collier said it will be weather dependent.

Members of the group have flown red balloons next to tall Launceston sites before, such as the Silo Hotel and the Telstra building.

"When you see a balloon flying at 39 metres, you see just how high it really is," Mr Collier said.

"The proposed Gorge Hotel at 39-metres high [is] in blatant contravention of the council's own planning scheme," they said.

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The group will meet at Home Point at 11am on Sunday near the Tamar River Cruises office.

They will then walk to Kings Park to "protest against the city council's approval" of the hotel.

The walk is in support of Susie Cai, the sole appellant to the Resource Management and Planning Appeal Tribunal who, is taking on the hotel's developers - Josef Chromy Group.

Ms Cai, mother of three and proprietor of the Golden Brumby Restaurant, has engaged the services of an environmental planner, a solicitor and expert witnesses to represent her at RMPAT.

The restaurant is located on the immediate boundary of the proposed hotel site.

Launceston Heritage Not Highrise was established by a group of community members concerned about the council's decision to approve the development application for the proposed hotel and other possible tall buildings within Tasmania, particularly in the Launceston area.

At this time the prime aim of the group is to morally and financially support appellant Ms Cai in her appeal, Mr Collier said.

City of Launceston council general manager Michael Stretton said the council will not comment on matters currently before the RMPAT for determination.

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