What is a CDC and when is it required? Certificate of Design Compliance (CDC) explained.

A Certificate of Design Compliance (otherwise known as a CDC or BA3) is the formal certification from a registered building surveyor declaring all drawings, specifications and technical documents for the proposed building or structure satisfy the National Construction Code (NCC) and applicable Australian Standards.

The CDC is issued prior to submission of a BA1 – Application for Building Permit (certified) for both residential and commercial buildings.

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A CDC allows a building surveyor to assess the proposed scope at the design stage of the building process and expedites the submission through council, saving time and money for the builder or client.

Is a CDC required for commercial buildings? Yes. A certified building application is to be submitted to the local government for all commercial Class 2 – 9 buildings.

What buildings do you certify? We provide building certification services for both residential and commercial buildings.

CDC's for residential buildings (class 1 & 10 buildings):

• New single and multi-storey dwellings and ancillary dwellings (class 1A and 1B)

• Garages, carports, pergolas and sheds (class 10A)

• Swimming pools, screen walls, fencing and retaining walls (class 10B)

• Multi Grouped dwellings and dual occupancies

• Prefab and modular housing

CDC's for commercial buildings (class 2-9 buildings):

• All commercial buildings

• Mining and civil works

• Agriculture and marine

For further information on when a Building Permit and CDC is required check out our website for residential building certification and commercial building certification.

For further reading check out the following links:

• Building approvals https://www.wa.gov.au/organisation/building-and-energy/building-approvals

• https://ablis.business.gov.au/service/wa/building-approval-certificate/17735

• Find a building surveyor (WA) https://www.wa.gov.au/service/community-services/find-registered-building-surveyor

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