Replacing a toilet seems like a straightforward job, but there are several decisions that affect whether the new suite fits, works properly, and meets plumbing requirements. Below are the most common toilet installation questions we hear from Gold Coast homeowners.
How do I know a new toilet will fit?
Toilet suites come in different shapes and sizes, and the most critical measurement is the "set-out" — the distance from the wall to the centre of the waste outlet in the floor (for an S-trap) or the wall (for a P-trap). If the new toilet's set-out doesn't match the existing waste connection, the installation becomes more complex and may require altering the pipework.
Also check the overall width and projection from the wall, especially in a small bathroom or powder room where space is tight. Measure the available space and compare it to the new toilet's dimensions before buying.
S-trap or P-trap — what's the difference?
An S-trap toilet connects to a waste pipe in the floor, while a P-trap connects to a waste pipe through the wall. The type you need is determined by your existing plumbing — you can't simply choose whichever you prefer. Most Australian homes use S-trap toilets, but many modern installations, particularly wall-faced suites, use P-traps.
Can I install a toilet myself?
Toilet installation involves connecting to the water supply and the sewer, and in Queensland this work must be carried out by a licensed plumber. Incorrect installation can cause leaks, sewer gas ingress, and non-compliant connections. It's a relatively quick job for a licensed plumber, and the compliance and warranty protection are worth the cost.
What about water efficiency?
Toilets carry a WELS (Water Efficiency Labelling and Standards) rating. A dual-flush toilet with a 4-star WELS rating can save significant water compared to an older single-flush model. Over the life of the toilet, the water savings from an efficient model can be substantial, particularly for larger households.
Do I need to replace the pan collar or seal?
When replacing a toilet, the seal between the pan and the waste pipe (the pan collar or rubber cone seal) should always be replaced rather than reused. An old or compressed seal is a common cause of leaks and sewer gas odours after a toilet replacement.
How long does a toilet installation take?
A straightforward like-for-like replacement, where the new toilet matches the existing set-out and connections, typically takes 1–2 hours. If the waste pipe needs altering, the floor needs repairing, or the water supply needs relocating, the job takes longer.
Should I repair or replace my toilet?
If the toilet is old, cracked, or repeatedly blocking, replacement is often more cost-effective than repeated repairs. A new water-efficient suite also reduces ongoing water costs. See our guide on whether to repair or replace your toilet for a detailed comparison.
Things to consider when choosing a new toilet
For a fuller checklist, see our article on what to consider when replacing a toilet. In short: measure the set-out, confirm the trap type, check the WELS rating, and choose a quality suite that suits the bathroom.
If you're replacing a toilet on the Gold Coast, contact our plumbing team to arrange a professional installation.
Frequently Asked Questions
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