Strata Bathroom Renovation Rules: What Approval You Actually Need

Renovating a bathroom in an apartment is not a harder building job than renovating one in a house. It is a harder permission job. The plumbing is more constrained, the neighbours are closer, and — the part that surprises most owners — a good deal of what you are about to demolish and rebuild is not legally yours.

This guide explains how that works in general terms, what a strata committee is usually worried about, and how to put an application together that does not come back with questions. The rules differ between states and territories, and between schemes within them, so treat this as orientation rather than as the answer for your building. Your registered strata plan, your by-laws and your strata manager are the authority.

What you own, and what you do not

A strata scheme divides a building into lots (the apartments) and common property (everything else). The boundary is set by the registered plan, and for a bathroom it usually falls in an awkward place.

Generally speaking:

• Yours: the fittings, the tiles and their bedding, the joinery, the glass, the fan you had installed, the paint, and the internal non-structural linings.
• Common property: the structural slab, the structural walls, the original waterproofing membrane, the windows and external walls in most schemes, and pipes and ducts that serve more than one lot.

The waterproofing is the sting. The membrane under your tiles is commonly common property, even though it sits inside your apartment and you are the only person who will ever benefit from it. Removing it and replacing it is therefore an alteration to common property, which is precisely why bathroom renovations need approval when repainting a bedroom does not.

The categories of work

Strata legislation in a number of Australian jurisdictions sorts changes into tiers. The names and the thresholds vary, but the shape is broadly consistent:

Cosmetic work — hanging a mirror, installing a towel rail, painting, replacing a tap or a light fitting. Usually no approval needed, sometimes with a notification requirement.

Minor renovations — work inside the lot that does not affect structure or waterproofing. Often approvable by a resolution of the owners, and in some schemes delegated to the committee, which is considerably faster than waiting for a general meeting.

Major work — anything affecting the structure, the external appearance, or waterproofing. This is the tier a bathroom renovation almost always lands in, and it typically needs a formal resolution and frequently a registered by-law.

Two practical consequences. First, do not let anyone tell you a bathroom renovation is a minor renovation because the room is small — the trigger is the waterproofing, not the floor area. Second, find out which resolutions your scheme can pass at committee level and which need a general meeting, because that single fact determines your timeline.

What the committee is actually worried about

It helps to read an application from the other side of the table. An owners corporation has seen leaks, and it is thinking about five things:

1. Will this leak into another apartment? Hence the interest in who is waterproofing, with what product, to what specification, and whether documentation will be provided.
2. Who pays if it does, in five years? Hence the by-law assigning maintenance of the new membrane to the lot owner.
3. Will the building be damaged getting materials in and rubble out? Hence protection of lifts, stairwells, lobbies and carpet, and a nominated waste route.
4. Will the other residents complain? Hence permitted working hours, notice to neighbours, and a program.
5. Is the tradesperson insured and licensed? Hence certificates of currency and licence details.

Every item in a good application maps to one of those five worries.

What a complete application usually contains

• A written scope of work, specific enough that a reader knows what is being removed and what is going back
• A plan or sketch of the proposed layout, especially where anything moves
• The waterproofing specification: product, number of coats, areas and heights, and the standard being worked to
• Licence details for the builder, plumber, electrician and waterproofer
• Certificates of currency for public liability and workers compensation, and any statutory home warranty or building compensation cover required in your state
• Proposed working hours and an indicative program
• Protection measures for common areas and the nominated waste route
• Confirmation that waterproofing documentation will be provided on completion
• Where drainage moves or the slab is affected, engineering advice
• A proposed by-law, if the building requires one — usually drafted by the scheme's own lawyer at the owner's cost

If you submit all of that at once, most committees have nothing left to ask. If you submit a one-paragraph email saying you would like to renovate your bathroom, you will get a list of questions and miss the meeting.

Waterproofing, the recurring theme

Everything above orbits the membrane, so it is worth being clear about why.

A failed bathroom membrane in an apartment does not announce itself in your apartment. Water tracks through the slab or down a wall and appears as a stain on somebody else's ceiling, months later, with no obvious source. Establishing which lot it came from, then who is responsible, then who pays for the repair and the damage, is one of the most common and most expensive disputes in strata.

Which is why the sensible approach as an owner is to over-document rather than under-document: use a licensed waterproofer, keep the product data, keep the certificate, photograph the membrane before it is tiled over, and keep those photographs. If a stain ever appears downstairs, that folder is the difference between a conversation and a claim.

Noise, hours and neighbours

Bathroom demolition in an older block is genuinely loud, because a thick mortar bed has to be broken out of a concrete slab that transmits sound through the whole building. Buildings set permitted hours for that, and the hours are not a suggestion.

Two things make this go better. Tell the neighbours directly — a note under the doors above, below and either side, naming the noisy days, does more for goodwill than any amount of compliance. And front-load the noise: get the demolition done in as few days as possible rather than spreading it over three weeks.

Timeline, honestly

A realistic order of operations for an apartment bathroom:

1. Request the by-laws and any renovation guidelines, and find out when the building meets — do this first
2. Measure, design and quote
3. Assemble and lodge the application
4. Wait for the meeting; answer questions if any
5. Approval, and the by-law registered if one is required
6. Order materials — long-lead tiles can be ordered in parallel with step 4 at your own risk
7. Build

Steps 1 to 5 frequently take longer than step 7. Owners who plan around that are calm; owners who book a builder first are not.

If your building says no

Ask specifically what the objection is. Very often it is fixable: a different waste route, tighter hours, a stronger membrane specification, an engineer's letter, or agreeing to the by-law that was the real sticking point. A revised application that answers the stated objection succeeds far more often than an argument about principle. Where you believe a refusal is unreasonable, strata legislation in most jurisdictions provides review and dispute resolution avenues, and that is the point to get your own advice.

Related reading

If your apartment bathroom is in an older block, the waterproofing and tiling page explains what is involved in replacing a membrane over an old slab, and the process page shows where approval sits in a real program.

This guide is general information, not legal advice. Strata law differs between states and territories and by-laws differ between schemes.