An artist's impression of how the new stadium could look in Civic.

An artist's impression of how the new stadium could look in Civic - minus the now guaranteed roof.

The ACT government says the proposed CBD stadium will have a roof – it’s just a question of whether it will be a retractable roof or a fixed one.

It will be cold comfort for the 7023 Canberra Raiders fans and 14,020 ACT Brumbies supporters who braved rain, hail and freezing cold at Canberra Stadium on the weekend, but ACT sports minister Andrew Barr told The Canberra Times on Sunday a ‘‘roof is a certainty’’.

The government hopes to redevelop the Civic area down to Lake Burley Griffin, with a new stadium part of a decade-long project that is subject to an approved business model.

ACT sports minister Andrew Barr.

ACT sports minister Andrew Barr. Photo: Jay Cronan

The first step in the $200-300 million project is relocating the Olympic pool and then planning will begin on the stadium, with construction hoped to begin before 2020.

Barr said a roof was a necessity and would allow the stadium to be used for more than just sport, with concerts and other major events also possible year round.

He said having a retractable roof, similar to Melbourne’s Etihad Stadium, would be more expensive than a fixed one, which has been used in Dunedin.

The government was keeping in contact with the New Zealand authorities to ensure there were no turf problems related to being enclosed, Barr said.

‘‘A roof is a certainty, it’s just a question of what sort of roof, whether it’s Etihad-style – opening and closing – or a Dunedin-style – which is more of a greenhouse operation,’’ Barr said.

‘‘The other reality of why a roof is essential is it opens up the venue to many other events and activities and in order for it to be economic, and to be a viable business case, and in order to be able to leverage the private-sector investment, it will need to be used more than [the current] 25 times a year.’’

Barr said the stadium would also include onsite hotels and would create a greater vibrancy around Civic during major events.

Currently, crowds going to Canberra Stadium simply ‘‘drive-in and drive-out’’. But a new stadium in the city would allow people to frequent the bars and restaurants in Civic and provide a boost to the local economy.

It would also be set up as an ongoing concern and not just used on game day. Hotels, cafes and car parks would operate throughout the year and not leave it as an urban wasteland.

Brumbies chief executive Andrew Fagan said this weekend's weather highlighted the need for a covered stadium, which  would be a boost to both them and the Raiders.

‘‘With the two primary teams in the town, the Brumbies and the Raiders, playing through winter ... I think a rectangular stadium with a roof on it is the only way to go,’’ he said.

‘‘We know from supporter feedback a city-based enclosed stadium would significantly increase our attendances.’’