How to Replace a Toilet (Is It a DIY Job?)
Thinking about replacing your toilet and wondering if it’s a DIY job or one best left for the pros? Learn how to choose the right toilet, understand different styles like wall-hung vs back-to-wall, and get a step-by-step guide on installation.

So – can you replace a toilet yourself? Well, the short answer is: it depends. If you’re comfortable with basic plumbing tasks and you’re just replacing an existing toilet with a similar model, you might be able to handle it yourself. But if you’re changing styles or relocating the plumbing, you’ll likely need a tiler and a plumber to get the job done right. Let’s break it down step by step.
Step 1: Finding a New Toilet
Before you get into installation, you need to pick the right toilet for your space. There are a few key things to consider:
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Trap type. This refers to how the toilet connects to the waste pipe. S-Trap toilets have the waste pipe going directly into the floor and are common in older homes. P-Trap toilets have the waste pipe exiting through the wall. These are common in apartments and newer builds. Make sure your new toilet matches your existing plumbing setup unless you’re prepared for extra work
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Setout measurements. This is the distance from the wall to the centre of the waste pipe (for floor-mounted toilets) or the distance between the mounting bolts for wall-hung models.
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Water efficiency. Look for a WELS-rated toilet to help save water (and money).
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Bowl shape. Round bowls are more compact, while elongated ones offer more comfort.
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Style, design and features. Modern toilets offer features like rimless bowls for easier cleaning, soft-close seats, water-saving dual flush, and even smart options with bidets and heated seats.
Step 2: Pick Your Toilet – Wall-Hung or Back-to-Wall
The type of toilet you choose can impact not just the look of your bathroom but also the complexity of installation.
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Back-to-wall toilets. These are a popular choice for Aussie homes. The pan sits flush against the wall, hiding the pipework and making cleaning easier. Installation is relatively straightforward since they connect to standard plumbing points.
Back to wall toilets can be a DIY job, but it’s a case-by-case basis. SHOP NOW.
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Wall-hung toilets. These give a sleek, floating look, with the cistern concealed inside the wall. They’re great for a modern, minimalist bathroom but require in-wall framing and more complex plumbing, which usually means a professional install.
Wall hung toilets (especially smart ones like this Lafeme Smart Toilet) will most likely need a professional installer.
If you’re simply replacing an old back-to-wall toilet with a new one, you might be able to do it yourself. But if you’re switching styles or moving plumbing points, you’ll likely need an expert.
Step 3: Determine if You Need a Tiler
Before installing your new toilet, check if your flooring and wall tiles will be affected. If the new toilet has a different shape, size, or installation style, you might need a tiler to help. Here’s how to tell if you need one.
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Same size and shape? No problem. If your new toilet matches the old one exactly, you likely won’t need any tiling work.
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Different base size or shape? You may need patching. If the new toilet leaves gaps or exposed areas, a tiler can help blend it in.
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Upgrading to a wall-hung toilet? You’ll need tiling work. Wall-hung models require in-wall mounting, which means adjusting the tiling around the cistern and brackets.
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Damaged or uneven tiles? It’s worth fixing. If the area under the old toilet looks rough, a tiler can ensure a smooth, level surface.
If you’re unsure, getting a quick opinion from a tiler can save you from unexpected surprises once installation starts.
Step 4: Replacing a Toilet – Can You Do It Yourself?
If you’re swapping like-for-like, you can certainly try this as a DIY project, but it’s very much a case-by-case scenario. Here are some basic steps.
Tools You’ll Need:
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Adjustable wrench
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Bucket and sponge (for any leftover water)
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Screwdriver
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Silicone sealant
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Plumber’s tape
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Rubber gloves
How to Replace a Toilet
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Turn off the water – Locate the isolation valve near the toilet and shut it off. Flush to empty the cistern, then use a sponge to soak up any remaining water.
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Disconnect the water inlet – Use a wrench to loosen the connection where the water supply meets the cistern.
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Remove the old toilet – Unscrew the bolts securing the pan to the floor. If it’s sealed with silicone, carefully cut around it with a knife. Lift the toilet straight up to detach it from the waste pipe.
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Prepare for the new toilet – Clean the area, make sure the waste pipe is clear of debris. Apply a new pan collar seal to prevent leaks.
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Install the new toilet – Position the toilet over the waste pipe and secure it to the floor. For back-to-wall models, attach the cistern to the wall as needed.
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Reconnect the water – Tighten the water supply hose back onto the cistern, applying plumber’s tape to prevent leaks.
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Test for leaks – Turn the water back on and flush a few times, checking for any leaks around the base or connections.
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Seal the base – Once everything is secure and leak-free, apply a thin bead of silicone around the base to keep things neat and prevent water damage.
When to Call a Professional
If you run into any of these issues, it’s best to get a licensed plumber involved:
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You don’t feel confident doing the job yourself
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Your toilet doesn’t align with the existing waste pipe
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There’s a leak you can’t identify
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You’re installing a wall-hung toilet or moving plumbing points
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The tiling needs serious repairs
The Verdict: DIY or Pro Job?
If you’re simply replacing an old back-to-wall toilet with a new one of the same type, you can potentially handle it yourself with some basic tools and patience.
But if you’re dealing with hidden cisterns, plumbing adjustments, or tiling work, calling in a professional will save you time and avoid costly mistakes.
Either way, a new toilet can be a great upgrade for your bathroom – just make sure you’ve got the right tools (or team) for the job!
Ready to upgrade? Browse our full range of toilets and find the perfect match for your home.