Most like-for-like Victorian bathroom renovations avoid a permit, but not compliance
In Victoria, a like-for-like internal bathroom renovation usually does not need a building permit if no structural work is done. The work still needs AS 3740 waterproofing, licensed plumbing and electrical work, correct registration for larger domestic building work, contract rules and the right insurance pathway.
Permit and compliance threshold table
This table is the practical homeowner version. A registered building surveyor decides permit requirements, but these are the triggers that matter before you start planning a bathroom, ensuite, laundry or accessible conversion in Greater Geelong.
| Work or threshold | What it usually means | Instrument or authority | Homeowner risk |
|---|---|---|---|
| Replace fixtures, tiles and linings within the same room | Usually no building permit if non-structural | Building Act 1993, Building Regulations 2018, NCC still apply | Low permit risk, but wet-area compliance still matters |
| Alter loadbearing wall, floor structure, window or external envelope | Building permit likely before work starts | City of Greater Geelong building permit process and registered building surveyor | Illegal work, stop-work orders, sale delays |
| Waterproof shower, bathroom floor or wet area | Must be waterproof or water resistant as required | NCC 2022, AS 3740, AS/NZS 4858 for membranes | Leak, insurance dispute, expensive rectification |
| Plumbing rough-in, drainage or fixtures | Registered or licensed plumbing work required | Building and Plumbing Commission plumbing registration and licensing | No compliance certificate, claim problems, unsafe drainage |
| Domestic building work over $10,000 | Registered practitioner and major domestic building contract requirements generally apply | Domestic Building Contracts Act 1995, Consumer Affairs Victoria, BPC | Weak contract rights and registration problems |
| Deposit on contract under $20,000 | Maximum 10 percent deposit | Consumer Affairs Victoria deposit rules | Overpaying before protection or work starts |
| Deposit on contract $20,000 or more | Maximum 5 percent deposit | Consumer Affairs Victoria deposit rules | Large cash exposure before progress |
| Eligible major domestic building contract over $20,000 from 1 July 2026 | Home Warranty cover pathway applies for homes up to 3 storeys | BPC and Consumer Affairs Victoria Home Warranty guidance | No cover notice, weaker protection if builder disappears |
| Accessible home modification funding | Assessment-based support may apply | Victorian Aids and Equipment Program, aged-care AT-HM scheme | Funding delays, OT scope mismatch, non-compliant installation |
The actual rules and bodies to know
Building Act 1993 and Building Regulations 2018. These sit behind the Victorian building permit system. For a bathroom, they matter most when work changes structure, affects openings, changes the building envelope or needs inspection by a building surveyor. City of Greater Geelong guidance describes a building permit as generally required before construction, demolition or structural alteration work.
National Construction Code 2022. The NCC sets the performance requirements for wet areas. For houses, it is the national baseline that makes bathroom waterproofing and water resistance a building requirement, not a nice extra. When a bathroom fails, the question is not whether the tile looked neat on handover. The question is whether the wet area was built to perform.
AS 3740 waterproofing of domestic wet areas. AS 3740 is the standard repeatedly named in Victorian wet-area guidance. It deals with waterproof and water-resistant areas, junctions, penetrations, shower zones and membrane detailing. Our Geelong AS 3740 waterproofing page goes deeper into what homeowners should ask to see before tiling starts.
AS/NZS 4858 wet-area membranes. This standard is relevant because membranes need to be classified and suitable for their detailing and movement conditions. In plain English, not every bucket of membrane is suitable for every shower detail.
Building and Plumbing Commission. The BPC is the current Victorian body for checking building practitioners and plumbers. Many homeowners still say "VBA registered" because the old Victorian Building Authority name is familiar, but the public guidance now uses the Building and Plumbing Commission name. Before signing, check the practitioner, class and status.
When a Geelong bathroom needs a permit
A straightforward strip-out and rebuild within the same bathroom footprint usually does not need a building permit when the work is internal and non-structural. That means replacing the vanity, toilet, bath, shower, tiles, wall linings, ceiling fan and waterproofing can often proceed without a permit, provided the correct licensed trades and standards are used.
A permit becomes likely when the work changes the building, not just the finishes. Examples include removing a loadbearing wall between a bathroom and toilet, cutting a new window, changing a floor structure for a level-entry shower, altering structural framing for a niche in the wrong wall, or extending the room outside the existing envelope. In heritage overlay areas around central Geelong or older Newtown streets, external changes can also raise planning questions before building work is considered.
If a permit is required, a registered building surveyor should be appointed before work starts. The surveyor sets inspection requirements and issues the final inspection documentation. Continuing work after a permit has lapsed or doing permit work without a permit can create legal and sale problems that are much more expensive than asking the question upfront.
Contracts, deposits and insurance in 2026
Bathroom renovations often cross the $10,000 threshold, so contract rules matter. Consumer Affairs Victoria states the major domestic building contract threshold is $10,000. The contract should give a clear scope, price, payment stages, start timing, warranties, dispute process and required guide information. A vague email quote is not enough for a $35,000 wet-area rebuild.
Deposits are capped. The cap is 10 percent if the total contract price is under $20,000, and 5 percent if it is $20,000 or more. That means a $38,000 bathroom should have a deposit no higher than $1,900. Large upfront payments are a red flag, especially when insurance or warranty cover has not been dealt with.
From 1 July 2026, Consumer Affairs Victoria guidance says Home Warranty cover applies after the builder signs a major domestic building contract where eligible work costs more than $20,000 and the home is up to 3 storeys. Before 1 July 2026, the familiar Domestic Building Insurance threshold was more than $16,000. Because this changed mid-year, use the contract date and current BPC guidance when checking a job.
Planning a bathroom that might need approval? Call before you lock the design. Moving a wall, window, drain or floor structure can change the whole approval path.
☎ Call (03) 9022 1391What goes wrong at sale time or claim time
The painful part of non-compliant bathroom work is that it may look fine for the first year. Problems show up when a buyer’s building inspector finds moisture in the wall behind a shower, when a ceiling stains below an ensuite, or when an insurer asks whether the leak was sudden or gradual. Missing certificates, no contract, no permit where one was needed and no evidence of waterproofing all make the conversation harder.
Rectification is expensive because bathrooms are layered systems. You cannot reliably repair a membrane from above without removing tiles. You cannot inspect rotten bottom plates properly with a vanity hiding the wall. A failed $900 waterproofing shortcut can become an $18,000 shower rebuild or a $35,000 full bathroom renovation.
The honest constraint is that we do not provide legal certification for someone else’s hidden past work. We can inspect, quote repairs and rebuild a wet area properly, but we will not write a clean compliance certificate for a membrane we did not see installed. If you are buying or selling, get independent inspection advice as well as renovation pricing.
Useful internal planning pages include bathroom waterproofing, accessible bathrooms, moving a toilet in Geelong and heated towel rail circuit rules.
Check the rules before your Geelong bathroom quote
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