Access Canberra is investigating almost 200 possible cases of shoddy building work on Canberra construction sites, it has been revealed.

In the past nine months, the regulator has also dished out 139 demerit points to construction licence holders and issued a rectification order at a multi-unit housing block in Canberra's north.

Minister for Building Quality Improvement Gordon Ramsay said Access Canberra was investigating 187 cases of alleged breaches of ACT building and planning rules. Credit:Karleen Minney

Minister for Building Quality Improvement Gordon Ramsay revealed the statistics during a speech in the Legislative Assembly on Thursday, during which he also outlined the next phase in the rollout of the government's building quality reforms.

Industry groups and trade experts have heavily criticised the government's apparently lax approach to regulating building quality in the ACT, claiming it was partly responsible for the problems plaguing developments across Canberra.