Engineers Australia said yesterday that two of the opposition's key infrastructure pledges were above average or better, while ACT Labor's pledges were rated average or worse by the engineers.

The Liberals scored four stars each for their approach to integrated planning of infrastructure and of new infrastructure delivery while the government was given only three stars in those areas.

But Labor outscored its opponent in infrastructure funding and transport, with three stars in both areas to the Liberals' two.

The engineers gave Labor two stars each for electricity and telecommunications while finding it was not possible to rate the Liberals in those areas.

Engineers Australia Canberra division president Doug Mitchell said the scorecards were important in a city with growing infrastructure needs.

''The last decade has seen a massive increase in ACT government investment in infrastructure, and this is set to continue as residential densities rise,'' Mr Mitchell said.

''We only vote for our government every four years, but the government's $19 billion of physical assets will be here for generations to enjoy and maintain for decades to come.''

Canberra Liberals leader Zed Seselja said the scorecard was a vote of confidence in the Liberals' approach to building the city.

''I'm pleased to see Engineers Australia support the Canberra Liberals' long-term approach to infrastructure planning, which includes establishing an independent infrastructure commissioner, backed by an industry board,'' he said.

''One of the main reasons infrastructure delivery, such as the GDE, has failed is due to the short-term thinking of ACT Labor, and Canberrans are having to foot the bill.''