He said yesterday it was important that the concept of Canberra as a planned city continue and Government compliance was paramount.

''We want important buildings of lasting value, sustainable designs that last well and are not rebuilt constantly.''

Mr Tanner presented Chief Justice Robert French plaques for last year's state and national 25 Year Award, recognising the court's achievement in sustainable architecture.

The award acknowledges architecture that remains relevant to its original purpose and is worthy of ongoing maintenance.

Chief Justice French said the High Court represented ''centrality and delivery in the rule of law''.

''It is a distinct part of democracy,'' he said.

The ceremony also marked the start of National Architecture Week, which aims to awaken the public's knowledge and interest in architecture, and enables members of the public to explore unusual buildings.

Mr Tanner emphasised the importance of quality and long-lasting architecture, saying there had recently been ''some reservations about the method of procurement'' of buildings such as the National Museum of Australia and the National Portrait Gallery.

He said the High Court was a perfect example of enduring architecture that combined aesthetics and functionality.

''The most beautiful use of off-form concrete for the ramps and walls, combined with the granite-like pavements, gives the building a permanent finish,'' he said.

''It creates a kind of sculptural experience.''

The adjacent National Gallery of Australia and the High Court formed ''a kind of duo''.

The same company won competitions to design both Canberra buildings in the 1970s.

Mr Tanner said the dramatic and adventurous design was a winning combination for the architects, Edwards Madigan Torzillo Briggs International.

This year's ACT 25 Year Award went to 13 Furphy Place, Garran, a private house design by Scollay, Bischoff and Pegrum.

The national winner will be announced in Adelaide on Thursday this week.