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Melbourne — Tier-1 Pillar

Melbourne Bathroom Renovation — Waterproofing AS 3740, VBA Plumber, Owners Corp

Melbourne bathroom renovation reality. AS 3740-2021 waterproofing certificate, VBA-registered plumber Compliance Certificate, Owners Corporation consent for apartments, 4-star WELS fixtures, asbestos pre-1990 survey. A$20K-A$50K typical.

~2 min read·Updated 2026-04-23

Melbourne bathrooms fail at the waterproofing membrane and the Owners Corporation consent. Both can be prevented. AS 3740-2021 is the binding standard for wet-area waterproofing, with compliance demonstrated via a waterproofer's certificate retained with the lot title. The plumber must be VBA-registered and lodge a Plumber Compliance Certificate with the VBA on completion for any supply, sanitary, or stormwater work.

Apartments under the Owners Corporations Act 2006 require OC consent because bathroom waterproofing sits on the boundary between lot and common property — a leak affects neighbours below. Many older inner-Melbourne schemes in Carlton, Fitzroy, Richmond, South Yarra, St Kilda, and Elwood operate with strict OC controls that can delay consent 6-14 weeks.

AskBaily routes your Melbourne bathroom renovation to a VBA-registered builder with waterproofing trade relationships and OC consent experience.

What a Melbourne bathroom renovation involves

  • Waterproofing. AS 3740-2021 compliant membrane on floor, hobs, walls to 1800 mm in shower.
  • Plumbing. VBA-registered plumber + Compliance Certificate.
  • Electrical. Licensed electrician + Certificate of Electrical Safety. IPX4+ shower zone fittings, RCD protection.
  • Owners Corp. OC consent under OCA 2006 for common property impact.
  • Asbestos. Pre-1990 bathroom walls, vinyl flooring, and insulation often asbestos-containing. WorkSafe Victoria compliant removal.
  • Building Permit. Typically required.

Frequently asked questions

Do I need a Building Permit for a bathroom renovation? Typically yes — the moment you move plumbing, alter floor levels, or breach the waterproofing envelope. Exempt categories are narrow.

What is the waterproofing certificate and why does my solicitor ask? AS 3740-2021 compliance is demonstrated via a waterproofer's certificate dated and referenced to the job. Buyers' solicitors request it at conveyancing.

How much does a Melbourne bathroom renovation cost? A$20,000-A$32,000 for a mid-range apartment bathroom refit. A$36,000-A$50,000 for a high-spec bathroom with stone, custom vanity, frameless glass. A$65,000-A$140,000 for master ensuite with steam shower, heated floors, and imported fixtures.

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