Thinking About Renovating Your Bathroom? Read This First

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Author: Jamie Thornton, Home Improvement and Lifestyle Writer

I renovated my bathroom a few years ago. And look, it turned out great in the end. But there was a period somewhere around week three, when the tiles were half done, the toilet was sitting in the hallway, and I’d just discovered the original plumbing was about forty years old, where I genuinely questioned every decision that had led me to that moment.

Nobody told me what I actually needed to know before I started. I had a Pinterest board and a rough budget. That was it.

So if you’re sitting there scrolling through bathroom ideas and thinking about pulling the trigger on a reno, this is the article I wish I’d had. No fluff, just the real stuff you need to think about before a single tile gets pulled off a wall.

Start With the Why Before You Think About the What

Before you get distracted by tapware and tile samples, get clear on why you’re renovating. The answer changes almost every decision that follows.

Are you renovating to sell? Then your priority is broad appeal and return on investment, not personal taste. Neutral tones, quality fixtures, clean lines. Nothing too polarising.

Are you renovating because the bathroom is genuinely broken, leaking, mouldy, or falling apart? That’s a different project to a cosmetic upgrade and it changes the scope significantly.

Are you renovating for yourself, to finally have the bathroom you actually want to live with? That’s the most enjoyable kind of renovation, but it also means making decisions that suit your specific habits, your body, your family, and how you use the space every single day.

Getting clear on the motivation saves you from making expensive decisions that don’t serve your actual goal.

Set a Realistic Budget and Then Add a Buffer

Bathroom renovations in Australia are rarely as cheap as people hope going in. A basic cosmetic refresh, new paint, new tapware, a vanity swap, can be done relatively affordably. A full gut renovation, ripping everything out and starting fresh, is a much bigger investment.

According to general industry guidance from the Housing Industry Association, a basic Australian bathroom renovation typically starts somewhere around eight to fifteen thousand dollars. A mid-range renovation with quality fixtures and professional tiling can sit anywhere from fifteen to thirty thousand dollars. At the higher end, particularly with structural changes or luxury fittings, costs can go significantly above that.

The number that surprises people most consistently is what’s inside the walls. Old homes especially, and Australia has a lot of them, often reveal ageing plumbing, waterproofing that was never done properly, rotted substrates, or electrical work that doesn’t meet current standards once you open things up. You won’t know until you’re in there, and by then you’re committed.

My honest advice: whatever budget you set, hold back roughly fifteen to twenty percent of it as a contingency and do not mentally spend it until the job is done. If you don’t need it, brilliant. If you do, you won’t be making stressful decisions under financial pressure mid-renovation.

Understand What Requires a Licensed Tradesperson in Australia

This is genuinely important and not something you can skip over. Australian building regulations are clear about what homeowners can and cannot do themselves, and getting it wrong doesn’t just risk a bad outcome. It can affect your insurance, your ability to sell the property, and in serious cases, create significant safety hazards.

Plumbing and drainage work in Australia must be carried out by a licensed plumber. This includes moving pipes, replacing the toilet pan connection, installing a new shower base with drainage, and connecting any new fixtures to water supply lines. The relevant licensing body varies by state, but the requirement is consistent across the country.

Electrical work, including moving light fittings, installing exhaust fans, adding power points, or any work inside the walls, must be carried out by a licensed electrician. Bathrooms are classified as a wet area under Australian standards, which brings additional safety requirements for electrical installations.

Waterproofing in wet areas is required to comply with Australian Standard AS 3740, which sets out the minimum requirements for waterproofing of domestic wet areas. This work should be carried out by someone with relevant experience and ideally certification, because it’s the thing most likely to cause catastrophic water damage if done incorrectly. It must also be inspected and certified before tiling proceeds. In most states, a waterproofing certificate is required.

Structural changes, anything that affects load-bearing walls or the floor structure, will typically require council approval or at minimum a building permit, depending on your state.

The practical takeaway: get licensed trades for anything that touches plumbing, electrical, waterproofing, or structure. Owner-builder work is possible for certain cosmetic elements but know where the line is before you start.

Figure Out the Layout Early and Resist Moving Things

The bathroom layout determines a significant portion of your cost. Moving the toilet, relocating the shower, or shifting the vanity to the opposite wall requires moving the drainage and supply lines behind the walls or under the floor. That’s expensive, disruptive, and adds time.

If your current layout fundamentally works and you’re mainly unhappy with how things look rather than where things are, designing around the existing positions can save you a substantial amount. A good bathroom designer or experienced builder can often achieve a dramatically different feel by changing surfaces, fixtures, and lighting without touching a single pipe location.

If the layout genuinely doesn’t work, whether the bathroom is awkward to use, the shower is too small, or you’re trying to reconfigure the space to add an ensuite or a second toilet, then moving things is justified. Just go in knowing what that decision costs.

Consider the wet zone carefully. A wet zone is the area where water is expected to flow, primarily the shower. The design of this zone affects waterproofing requirements, drainage placement, slip resistance of floor tiles, and ventilation needs. Good bathroom designers think about this from the start rather than retrofitting around it.

Ventilation Is More Important Than People Realise

This one gets underestimated consistently, and it causes real problems down the track. A poorly ventilated bathroom grows mould. Not because the renovation was bad, but because warm, humid air has nowhere to go.

Australian building regulations generally require mechanical ventilation in bathrooms that don’t have an openable window to the outside. Even in bathrooms that do have a window, an exhaust fan is strongly recommended, particularly in smaller spaces or in climates where windows are kept closed for much of the year.

The size and extraction capacity of the fan matters. An undersized fan in a larger bathroom won’t be adequate. When specifying a fan, check the cubic metre per hour rating against the volume of your bathroom space and get something with appropriate capacity.

Exhaust fans should vent to the outside, not into the roof cavity. Venting into the roof moves the moisture problem from your bathroom to your ceiling space, where it causes its own damage. Make sure your electrician and your builder are aligned on where the duct runs and where it exits the building.

Think About Waterproofing Longer Than You Think About Tiles

I say this because I know what people actually spend their mental energy on during a bathroom renovation. It’s the tiles. The grout colour. The tapware finish. Whether to do a floating vanity or a floor-standing one. All of that is genuinely enjoyable to think about.

Waterproofing is not enjoyable to think about. It looks like a thick, unpleasant grey membrane painted onto concrete or compressed fibre cement sheet. It goes on before the tiles do and then you never see it again.

But it is the single most important element of the renovation from a structural and financial perspective. Failed waterproofing allows water to penetrate the substrate and the structure. Over time, that causes rot, mould, damage to ceiling plaster in the rooms below, and eventual structural damage. The remediation cost for a waterproofing failure, particularly if it goes undetected for years, can be enormous. Far more than the cost of doing it properly in the first place.

The Australian standard for wet area waterproofing specifies minimum coverage areas and membrane thickness. These requirements are minimums. In high-use bathrooms, in bathrooms on upper floors, or in homes where you plan to stay long-term, going beyond the minimum is worthwhile.

Ask your tradesperson specifically about what membrane system they’re using, how many coats they’re applying, and how they’re handling the junctions between the floor and walls, which is where failures most commonly occur. A tradesperson who gives you a thorough answer knows what they’re doing.

Choosing Your Tiles: Practical Before Pretty

The tile selection is where most people spend the most time and, done without practical consideration, where some of the most expensive mistakes get made.

A few things to think through before you fall in love with a particular tile.

Slip resistance on floor tiles. The Australian standard for slip resistance in wet areas is specified by the P (pendulum) rating system. For bathroom floors, you generally want a minimum P3 rating in wet conditions. Shower floors warrant even more attention, often P4 or P5 depending on the slope and use. A beautiful large format polished stone tile might look incredible and be completely inappropriate for a shower floor. Your tiler and tile supplier should be able to advise on ratings.

Grout colour and maintenance. Light grout in a shower looks beautiful on day one. It looks considerably less beautiful after a year of daily use in a hard water area unless you’re committed to regular cleaning and sealing. Dark grout or epoxy grout are more practical choices in wet areas for most households.

Tile size versus room size and drainage. Large format tiles have become extremely popular and they can look fantastic. But they require precise floor levelling and complicate drainage falls in shower areas, because the floor needs to slope toward the drain and large tiles can’t flex or be cut as easily to accommodate that slope. Discuss this with your tiler before committing to oversized tiles in a small shower.

Consistency across renovation stages. If you’re doing a bathroom in stages and plan to continue later, note the tile batch number. Tile colours vary between manufacturing batches, and matching tiles purchased even six months later can be noticeably different.

Storage Planning Is Usually an Afterthought and Shouldn’t Be

Most people think about how the bathroom will look and forget to think about where things will actually go. The result is a beautiful bathroom with nowhere to put the shampoo, the spare toilet rolls, the kids’ bath toys, the cleaning products, the extra towels, or any of the other things that a bathroom actually needs to contain.

Think through your storage needs honestly before finalising the design. A wall-hung vanity with drawers provides different storage to a freestanding pedestal. A recessed niche in the shower wall, built in during construction, is far more practical and less cluttered-looking than a shampoo shelf added afterward. Mirrored cabinets above the vanity double as storage without taking up floor space.

If you’re working with a small bathroom, storage planning becomes even more critical. Every centimetre matters in a compact space and designing storage in from the start is far easier than solving the problem after everything is fixed in place.

Fixtures and Fittings: Quality Where It Counts

The tapware, toilet, vanity, and shower fittings are the elements you interact with every single day. They’re also the elements most visible to anyone who uses the bathroom. Spending a bit more on quality in this area tends to pay off in durability, appearance, and the general satisfaction of using the space.

In Australia, all plumbing products must be WaterMark certified, which is a mandatory certification indicating the product meets Australian standards for plumbing and drainage applications. When purchasing tapware, shower heads, or toilet suites, check for the WaterMark logo. Products sold through reputable Australian retailers will have this, but products purchased directly from overseas suppliers or through some online marketplaces may not, and your plumber may legally be unable to install uncertified products.

Water efficiency ratings also matter, particularly for toilets and shower heads. The Water Efficiency Labelling and Standards scheme, known as WELS, rates products on a star system. Higher-rated products use less water per flush or per minute. For households on metered water in Australian cities, this has a direct impact on water bills over time.

For toilets specifically, think about the height, the pan shape, and the flush mechanism. Comfort height toilets, slightly taller than standard, are easier for many people to use and are worth considering for long-term livability. In-wall cisterns, where the cistern sits inside the wall cavity, free up floor space and look cleaner but are more complex and expensive to repair if something goes wrong with the internal mechanism.

Timeline Expectations and Temporary Living Arrangements

A full bathroom renovation typically takes two to four weeks from when demolition begins to when the bathroom is usable again. More complex projects or those that encounter unexpected issues can take longer.

If you have one bathroom in your home, that’s a significant period to manage. Before work starts, think through practically how your household will function during that time. Are there amenities at a nearby gym or pool you can access for showering? Can family nearby help out? Is the timing aligned with a period when the disruption is manageable, away from school exams, major work commitments, or visiting relatives?

If you have a second bathroom or ensuite, the timing pressure is lower but it’s still worth coordinating with your builder about access and noise, particularly if people are working from home.

Tradespeople typically work in sequence. The plumber rough-in comes first, then waterproofing, then tiling, then the plumber returns to connect fixtures, then electrical final fix-out. Delays in any one stage flow through to the stages that follow. Understanding this helps you manage expectations and have realistic conversations with your builder when things shift.

Finding the Right People for the Job

Getting the renovation right depends enormously on who you hire. In Australia, checking licenses before engaging any tradesperson is straightforward. Most state and territory governments maintain public registers where you can verify whether a plumber, electrician, or builder holds a current and valid license.

For the renovation overall, you have options. You can hire a bathroom renovation company that manages the whole project and coordinates trades. You can hire a builder or project manager to coordinate trades you source separately. Or for confident renovators with good networks, you can manage it yourself and engage trades directly.

The first option costs more but removes coordination burden and gives you a single point of accountability. The third option requires significant time, organisational capacity, and knowledge of sequencing trades correctly.

Get multiple quotes for significant renovations. Not necessarily to drive the price as low as possible, but to understand what the market rate actually is and to get a sense of how different contractors approach the project. A quote that’s dramatically lower than others deserves scrutiny, not just celebration.

Check references or reviews. A bathroom renovation is a meaningful financial investment and an experienced, reputable trade or renovation company will have a track record you can verify. Ask to see examples of previous work. For tilers specifically, ask to see grouting close up, because grout finishing is where craftsmanship differences are most visible.

Don’t Forget the Finishing Details

The renovation is nearly done, the tiles are in, the plumbing is connected, and there’s a temptation to call it finished and move on. But it’s the finishing details that separate a bathroom that looks complete from one that looks like it was almost finished.

Silicone sealant at all junctions between tiles and fixtures needs to be applied neatly and consistently. Silicone is the last line of defence at junctions and it needs to be done well. It should also be replaced periodically as part of ongoing bathroom maintenance.

Door seals and thresholds matter, particularly for shower screens and glass panels, where water management depends on correct seals being intact.

Towel rails, toilet roll holders, and hooks should be fixed into wall studs or using appropriate fixings for tiled walls, not just screwed into tiles without backing. A towel rail pulled out of the wall by a wet towel takes a tile with it.

Mirrors and any cabinetry should be level, properly fixed, and aligned with the vanity and surrounding tiles in a way that looks considered rather than approximate.

These details take a small amount of time to get right and a long time to stop noticing if they’re wrong. They’re worth the care.

A well-planned bathroom renovation adds genuine value to an Australian home, improves daily life in a room most people use multiple times a day, and if done properly, should last many years without requiring attention. The planning phase is where most of that value is either created or lost. Take the time to do it well before a single tile comes off the wall.