ACT Greens planning spokeswoman Caroline Le Couteur has called for wide-ranging changes to planning legislation in the territory and will table a suite of reforms on Thursday.

One of the big-ticket items in the reforms is for greenhouse gas emissions to be assessed in the application stage for large-scale, gas-powered developments.

Such development applications would also be required to undertake an environmental impact statement in another reform.

The proposed changes would only affect larger developments such as manufacturing, waste disposal and larger shopping centres.

Large electric-powered developments would not be impacted as the territory's energy was renewable, Ms Le Couteur said.

"This would only be for a very small number of applications, it would be for things which are likely to introduce a large quantity of greenhouse gas emissions so it wouldn't be relevant to your standard house," she said.

Other reforms would require developers to re-consult with the public if major changes are made to a development after it has been approved.

Ms Le Couteur said she knew of situations where a developer had added another storey but maintained the approved building height, this was in response to that.

Development applications would also be extended by about three weeks during the Christmas and New Year period.

Under the changes, larger developments in newer parts of Canberra, such as Molonglo Valley, would be required to host pre-development application community consultation.

This process is required in older suburbs.

"The way the legislation is written for new areas you don't have to do it," Ms Le Couteur said.

"When the legislation was written these areas didn't have any significant number of people in the them and so it wasn't an issue."

Third-party appeal rights would be restored for development approvals that require the removal of a registered tree.

This is in response to the controversial removal of a London plane tree in Manuka following the approval of a five-story hotel.

Ms Le Couteur was of the view some her changes would be passed but that others were less likely to be supported.

"We need a planning system that delivers for all Canberrans," Ms Le Couteur said.

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"The community expects that the decisions made for our city's future are sustainable - prepare us for a more extreme climate reality - and give our community a say.

"When it comes to urban planning, progress has been far too slow."