Wet Area Waterproofing Compliance Certificate — VIC (Plumbing Compliance Certificate via VBA360) / NSW (Waterproofing Certificate) / QLD (Form 43 Aspect Certificate)

Issuing authority

VIC: Licensed plumber or registered building practitioner — lodged with Victorian Building Authority (VBA) via VBA360 | NSW: Licensed waterproofing contractor — issued to homeowner before tiling commences | QLD: QBCC-licensed waterproofing contractor — Form 43 submitted to building certifier

Official source

How to apply

1. Engage a licensed waterproofing or plumbing contractor — in NSW, waterproofing work valued at $500 or more must be done by a holder of a NSW Fair Trading waterproofing contractor licence; in VIC, a registered plumbing practitioner; in QLD, a QBCC waterproofing licensee.
2. The contractor applies the waterproofing membrane to wet area surfaces (bathroom, shower, laundry, balcony) in accordance with AS 3740 (domestic) or AS 4654 (external) and the National Construction Code (NCC).
3. NSW: The contractor issues a Waterproofing Certificate to the homeowner before tiling commences — the certificate confirms compliance with AS 3740 and NCC; it must be issued before the surface is concealed.
4. VIC: Within 5 days of completing plumbing/waterproofing work over $750 (incl. GST), the licensed practitioner purchases a Plumbing Compliance Certificate via VBA360, allocates it to the job, and lodges it with the VBA; a copy must be provided to the homeowner within 5 days.
5. QLD: For building work under a development approval (Class 1a or Class 10), the QBCC-licensed waterproofing contractor completes Form 43 (Aspect Certificate — QBCC Licensee) certifying how the waterproofing aspect complies with the development approval, and provides it to the building certifier.
6. Homeowner: retain the certificate — it is required for building warranty claims, strata/body corporate compliance, council sign-off, and property insurance.
7. Check that the certificate is issued before the shower or wet area is tiled — once the membrane is concealed, a non-invasive inspection cannot verify compliance.

Related topics

Related forms

• Building Permit Application (Multi-state: VIC Form 1 / WA BA1 & BA2 / QLD Building Approval / NSW Development Application)VIC: Form 1 (Application for a Building Permit); NSW: DA form via NSW Planning Portal; QLD: No fixed form number — lodged with private certifier or council; WA: BA1 (certified) / BA2 (uncertified)
• Occupancy Permit / Occupation Certificate (Multi-state: VIC Form 15/16 / NSW OC / QLD Form 11)VIC: Form 15 (Application for Occupancy Permit) + Form 16 (Occupancy Permit); NSW: Occupation Certificate (no fixed form number — lodged via NSW Planning Portal); QLD: Form 11 (Certificate/Interim Certificate of Occupancy, replacing certificate of classification from October 2020)
• Owner-Builder Permit / Licence — QLD, WA, SA, ACT and NTQLD: Owner-Builder Permit Application Form (form-ob-permit-application.pdf); WA: Form 75 (Approval — Owner-builder, updated; old version invalid from 1 June 2026); SA: CBS Online Form (via cbs.sa.gov.au/online-forms); ACT: Application for Construction Occupation Licence — Individual Owner Builder (forms.act.gov.au form code 1166); NT: Owner Builder Application Form (bpb.nt.gov.au)
• Home Building Compensation Fund (HBCF) Certificate of Insurance — NSW / Domestic Building Insurance Certificate — VIC / Home Indemnity Insurance Certificate — WA / QBCC Home Warranty Insurance
• Annual Fire Safety Statement (AFSS) — NSW