Apartment Bathroom Renovations in NSW and ACT: What’s Different, What’s Harder, and How to Get It Right
Before you book a tradie for an apartment bathroom renovation, there’s a conversation you need to have with your strata manager. Possibly with your building manager too. And definitely with any renovator you’re considering — about their experience inside strata buildings, not just with bathrooms.
Apartment bathroom renovation operates inside a different set of rules to a house. Structural and waterproofing works typically require owners corporation or body corporate sign-off. Construction hours are set by the building, not the renovator. Access runs through shared spaces with restrictions attached. And a waterproofing failure doesn’t just damage your bathroom — it damages the unit below.
This page covers what those constraints mean in practice, what they cost, and what to confirm before work starts.
What’s Different About Renovating an Apartment Bathroom
A bathroom renovation in a freestanding house gives you reasonable control over most variables. In an apartment, four constraints cut across that. They don’t make renovation impossible. They make choosing a renovator who understands them non-negotiable.
Structural and waterproofing works typically require owners corporation or body corporate approval before work starts. Not after. Skipping it creates problems at completion — and at sale.
Lifts need booking and padding. Common areas need protection. Construction hours are set by the building, often 8am–5pm Monday to Friday. A renovator who hasn’t confirmed this before quoting will find out on day one.
Most apartment bathrooms sit between 3 and 5m². What can be changed — and what can’t — is constrained by structural walls, drain locations, and the wet area footprint.
In a house, a waterproofing failure damages that house. In an apartment, water travels down. The unit below has a problem. So does your insurance position.
None of these constraints are unusual. They’re the normal operating environment for apartment renovation. A specialist who’s done this before knows how to work inside them.
Strata Approval: What Needs Sign-Off and What Doesn’t
This is where most apartment bathroom renovations run into trouble. Not because the work is done badly, but because it’s done without the right approval in place first.
In NSW, the owners corporation has authority over certain types of works within a lot — particularly anything that affects structural elements, waterproofing membranes, or common property. In the ACT, the equivalent body is the owners corporation under the Unit Titles (Management) Act, sometimes referred to as the body corporate. The terminology differs. The principle is the same: some works require approval before they begin.
The practical threshold in most strata schemes is cosmetic versus structural or waterproofing. Repainting walls, replacing a vanity like-for-like, updating fixtures — these typically don’t require approval. Replacing the waterproofing membrane, moving the shower, making changes that affect structural elements or shared services — these typically do. Your scheme’s by-laws set the specific rules. Not the general ones.
The consequences of skipping approval are more expensive than getting it first. A strata manager can issue a notice to comply, requiring rectification at the owner’s cost. Works without approval can complicate settlement when you sell. Some lenders flag unapproved works during conveyancing. None of these outcomes are worth avoiding a thirty-minute call to your strata manager before work starts.
Related: Confirm approval requirements with your strata manager before engaging a renovator. Rules vary by scheme — what requires sign-off in one building may not in another. See our bathroom renovation process guide ›
Access and Noise: The Constraints That Blow Out Timelines
A bathroom renovation in a house has one access constraint: the front door. In an apartment, it has several. Lift booking, lift padding, common corridor protection, waste removal scheduling, and construction hours that are set by the building — not negotiable by the renovator.
Most buildings allow construction between 8am and 5pm Monday to Friday. Some restrict it further — 9am starts, no work on the day before a public holiday, noise limits during periods when residents are likely to be home. A renovator who doesn’t confirm these rules with the building manager before quoting will discover them mid-job. Usually when a materials delivery is blocked at the lift or a neighbour complaint stops work for the afternoon.
Every constraint adds time. Added time adds cost — through after-hours surcharges, extended hire periods, and the compounding effect of a bathroom being out of service longer than expected. A competent renovator prices this honestly at the start. An access problem surfacing after work starts is a budget problem that wasn’t in the original quote.
*Directional industry estimate. Actual costs depend on building and scope.
Designing a Compact Apartment Bathroom
Most apartment bathrooms sit between three and five square metres. That’s a real constraint on what can change — but not an absolute one. The question is knowing which elements are genuinely fixed and which are just rarely moved because moving them costs more.
Structural walls can’t move without strata approval and engineering involvement. Drain locations can be repositioned, but doing so means stripping back the waterproofing membrane, re-setting the fall, and re-waterproofing the entire shower floor to AS 3740 — adding meaningful cost and time. These aren’t reasons to avoid changes. They’re reasons to be deliberate about which changes are worth their cost.
The decisions that have the biggest effect on how a compact bathroom feels — tile format, fixture selection, screen type — are usually the ones that don’t require approval. The decisions that require approval tend to be structural. That’s a useful distinction to have before the design conversation starts.
Waterproofing in Apartments: Why the Stakes Are Higher
A waterproofing failure in a house is a problem for that house. In an apartment building, it’s a problem for the unit below. Sometimes the one below that.
When a waterproofing membrane fails in an apartment bathroom — through inadequate installation, skipped steps, or a substrate not prepared to the standard required under AS 3740 — water doesn’t stay in the bathroom. It travels through the floor structure and appears as water damage in the ceiling of the unit below. At that point there are two damaged properties, a dispute about liability between lot owners, and an insurance claim that may not resolve simply.
This is why the waterproofing scope in an apartment bathroom renovation carries more weight than the equivalent work in a house. It’s why a licensed waterproofer is non-negotiable — not a preference. And why a certificate of waterproofing at completion isn’t just paperwork. Some strata schemes require a copy. Your insurance position may depend on it.
What to confirm before work starts: who is doing the waterproofing and what is their licence number. Whether the quote itemises waterproofing as a separate scope item. What standard they’re working to (AS 3740). Whether a certificate of waterproofing will be issued at completion.
Important: A waterproofing failure in an apartment is a building defect with consequences beyond your unit. Do not accept a quote that does not itemise waterproofing as a separate scope item with a licensed waterproofer named.
Not sure how your building’s strata rules apply to your renovation? We connect you with specialists who’ve worked inside strata buildings and understand the approval and compliance requirements before work starts. Lifestyle Bathrooms is a referral and connector service — not a licenced contractor. Request a free consultation ›
Choosing a Renovator for an Apartment Job
Not every bathroom renovator has worked inside a strata building. The gap in experience shows up in predictable ways: unfamiliarity with approval documentation, not knowing to confirm construction hours before quoting, waterproofing treated as a line item rather than a certified scope.
Before engaging anyone for an apartment bathroom renovation, confirm a few things. Have they done apartment jobs in strata buildings before — not just small bathrooms, but buildings with building managers and approval requirements? Will they handle strata approval documentation, or is that left to you? Who is doing the waterproofing, and are they licensed? How do they coordinate with the building manager before work starts?
The answers tell you something about whether this is someone who’s done this before or someone who’ll work it out as they go. Both types exist. One costs you more when the surprises arrive.
Strata and apartment renovation experience confirmed
Ask for examples of apartment jobs completed, not general assurances about experience.
Building manager liaison included in scope
The renovator coordinates with the building manager before and during the job.
Strata approval documentation handled by the renovator
Approval process, forms, and follow-up — in their scope, not left to you.
Licensed waterproofer named in the quote
Licence number available on request. Waterproofing itemised as a separate scope item.
Construction hours confirmed pre-quote
Building restrictions checked with the building manager before the quote is finalised.
Certificate of waterproofing at completion
To be provided at practical completion. Some strata schemes require a copy for records.
Apartment Bathroom Renovation Costs in NSW and ACT
Apartment bathroom renovation costs more than the equivalent house job. Not because the bathroom itself is more complex — because of the access overhead, staging requirements, and compliance documentation that house renovations don’t carry.
The ranges below are indicative. They are not quotes. Scope, site conditions, and strata requirements move these numbers significantly in either direction.
A quote significantly below the lower end of the full renovation range is either missing scope items or pricing them in a way worth clarifying before you sign. Access overhead and waterproofing certification are the items most commonly absent from low quotes — and the most consequential when they’re not done properly.
What Can Go Wrong — and What It Costs to Fix
The conditions that produce these outcomes are almost always present from day one. They don’t become visible until later — by which point the cost of fixing them is a multiple of what prevention would have been.
Works completed without strata approval
Strata managers have authority to require rectification of unapproved works at the owner’s expense. This isn’t a warning letter — it’s a legally enforceable notice. Unapproved structural or waterproofing works can also complicate settlement when you sell: buyers’ solicitors ask questions, and the answers matter during conveyancing. Getting approval before work starts takes a few weeks in most cases. Recovering from works done without it takes longer and costs more.
When the membrane fails and the problem is in the unit below
The unit below develops a water stain on their ceiling. That stain is your membrane. The sequence from there — liability dispute, insurance claim, remediation quote, repair to both units — is expensive and time-consuming regardless of who’s at fault. The failure is always cheaper to prevent than to remediate. In an apartment, it’s also someone else’s problem. That changes the conversation significantly.
Access not confirmed before work started
The renovator quotes on the basis of standard construction hours. The building allows 9am–4pm Monday to Thursday only. Day one involves a conversation with the building manager. From there, the timeline and quote both shift. After-hours surcharges, extended hire periods, and a bathroom out of service longer than planned. None of this needed to happen. A phone call to the building manager before quoting would have priced it correctly the first time.
Non-compliant floor tile installed in a wet area
A tile without the required P4 rating on a shower floor is a compliance issue that affects insurance and creates liability in a multi-occupancy context. You can’t identify it by looking at the installed floor. You identify it by checking the product data sheet before the tile is ordered. After installation, the options are surface grinding, which changes the finish and may void the tile warranty, or removal and replacement. Neither is inexpensive. Neither is difficult to avoid if the question is asked at the right stage.
Common Questions
It depends on what the renovation involves. Cosmetic works — repainting, replacing fixtures like-for-like, updating tapware — typically don’t require owners corporation approval. Works that affect structural elements, the waterproofing membrane, or common property typically do.
The threshold varies by scheme. Your strata scheme’s by-laws set the specific rules. Before engaging a renovator, confirm the scope of what you’re planning with your strata manager — not based on what someone else was or wasn’t required to get approval for, but on your scheme’s specific requirements.
Apartment bathroom waterproofing must comply with AS 3740 — the Australian standard for waterproofing of wet areas in residential buildings. In an apartment, that standard applies with higher practical consequences than in a house: a membrane failure affects not just your unit but the structure and the unit below.
The work must be done by a licensed waterproofer. The membrane must be applied to the correct dimensions and cured for the required period before tiling can begin. A certificate of waterproofing should be issued at completion. Some strata schemes require a copy for their records.
If your quote doesn’t itemise waterproofing separately and name the person doing it, ask before you sign.
Yes — but it costs more than most people expect, and it typically requires strata approval.
Moving a drain means stripping back the existing waterproofing membrane, repositioning the drain, re-setting the floor fall toward it, and re-waterproofing the entire shower floor to AS 3740. That’s a significant scope addition on top of the tiling and finishing work. Whether the result is worth the cost depends on how much the drain position is limiting the layout. A good renovator can model the difference before you commit.
Longer than the equivalent house job, typically. Not because the work itself takes more time, but because of the access and compliance overhead.
Allow 3–6 weeks for a standard compact apartment bathroom renovation, depending on scope. Strata approval, if required, adds time before work can start — typically two to four weeks for straightforward applications, longer for complex schemes or schemes with infrequent committee meetings.
Access restrictions, including restricted construction hours or lift booking requirements, can add days or weeks to the on-site programme depending on how the building is managed. A renovator with apartment experience will factor this into their programme from the start rather than discovering it mid-job.
More than you’d check for a house job. The constraints are different and the consequences of choosing someone who doesn’t understand them are more expensive.
Ask specifically about apartment and strata experience — not just small bathroom experience. A bathroom in a freestanding house with limited floor area is not the same job as one in a strata building with building manager coordination, approval documentation, and multi-storey waterproofing stakes.
Confirm who is doing the waterproofing and whether they’re licensed. Confirm that construction hours have been or will be checked with the building manager before the quote is finalised. Ask whether strata approval documentation is included in their scope or whether that’s left to you.
The questions that feel like extra work at the quoting stage are the ones that prevent budget problems during the job and compliance problems after it.