The role of a Principal Certifying Authority (PCA) is to supervise/monitor construction works and issue certificates that certify regulatory compliance. It is a requirement under the Environmental Planning and Assessment Act, 1979 that a sign be erected on all work sites showing the name, address and telephone number of the chosen PCA. Alternatively you can complete an Access to Information request form to find the appropriate details.
Any concerns with construction works including a belief that works are not proceeding in accordance with the approval are to be discussed with the PCA in the first instance. If you remain unsatisfied with the response of the PCA, complaints against Accredited Private Certifiers can be made in writing to the Building Professionals Board (NSW Department of Planning & Infrastructure).
The City of Canada Bay views illegal building work or the failure to comply with the terms and conditions of a development consent as extremely serious. Council is committed to rigorously monitoring any unauthorised changes to Development Applications or illegal building works. The consequences of carrying out illegal building works are significant and you should not under any circumstances risk it!