Geocon has proposed to build an eight-storey building with 106 apartments on a Giles Street block, next to the Kingston post office.

It took those plans to a community consultation earlier this year but was met with ire from some community members who claimed the height was inappropriate for the area. It is understood Geocon has sought to amend plans but it's unclear what components of the plans. A development application for the site has been held back.

Planning rules stipulate a two-storey height limit in the area can be exceeded if a development fits within a "desired character" for the suburb.

In an email to the Kingston Barton Residents Group, Mr Barr said the party would not support any territory plan variations associated with Geocon's proposed development, as presented in the consultation.

"If ACT Labor is re-elected in October we will not support any territory plan variation applications associated with, or lodged in conjunction with, the development as it is currently proposed," he said.

"Furthermore, we expect all development proponents to comply with the territory plan and associated codes. If this does not occur, we would consider the available options to oppose the development."

The Canberra Liberals also emailed the Kingston Barton Residents Group earlier this week to express their views on Geocon's proposal.

"The Liberal party's general positions has always been clear that we do not support the development as it is currently proposed; that it is not in keeping within the character of Kingston, and the planning rules (including height restrictions) should be maintained," the email said.

The ACT Greens are also against the development, saying it was against the "character of the precinct".

It is not the first time Mr Barr has spoken out against Geocon's proposal. He previously expressed his views in an email to the Kingston Barton Residents Group when the proposal was undergoing pre-development application community consultation in July.

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The Liberals and Greens have also previously spoken out against Geocon's proposal. At a community meeting in July Greens leader Shane Rattenbury said the building was "not appropriate in its current form".

The ACT planning authority, where development applications are assessed, is independent and decisions on applications are not governed by a minister.

"A clear message has been sent to Geocon and Purdon Planning by all three parties, the community and local businesses that this proposal is not acceptable and that they need to go back to the drawing board," Kingston and Barton Residents Group president Rebecca Scouller said.

However, Ms Scouller said she hoped the parties views would continue past the election and she did not want it to be an "empty campaign promise".

She pointed to a promise from Mr Barr in the 2016 election to develop a community panel to inform a master plan for the Manuka oval precinct.

"Neither the community panel or master plan ever eventuated," Ms Scouller said.

Geocon was contacted for comment.