Look first for plumbing compatibility: the trap type, set-out, water inlet position and toilet dimensions must suit your bathroom. Then compare seat height, bowl shape, suite design, cleaning features, WELS water-use information, flushing performance and the complete installation scope.
Check plumbing compatibility
Identify the existing waste outlet:
- S-trap: discharges through the floor.
- P-trap: discharges through the wall behind the toilet.
- Skew trap: discharges through a side wall.
Understanding toilet set-outs, S-traps and P-traps helps you compare a replacement against the existing plumbing. The new toilet must suit this arrangement unless a licensed plumber alters the connection. Check the manufacturer’s installation drawing because set-out ranges and inlet positions vary between models.
For an S-trap, measure from the finished wall, not the skirting board, to the centre of the floor waste. Other trap configurations require different measurements. Also record the water inlet’s height, horizontal position and whether it comes through the wall or floor. Make sure the pan or cistern will not obstruct the isolation tap or pipework.
You can inspect visible connections and take measurements, but do not disconnect the toilet or disturb concealed services. Toilet installation and plumbing alterations in NSW should be handled by an appropriately licensed plumber. If anything is uncertain, confirm compatibility before ordering.
Check dimensions and clearances
Compare the toilet’s full width, depth and height with the available space. Allow for:
- door movement and comfortable access
- clearance below windows, shelves or benchtops
- the cistern’s height and the pan’s projection into the room
- access to the isolation tap
- the footprint of the existing toilet.
A smaller replacement may expose old fixing holes, tile gaps, sealant marks or discolouration.
Compare comfort, design and cleaning
Choose the finished seat height and bowl shape for the people using the toilet. Round-front or compact pans can save space, while elongated bowls generally provide more sitting room. Test a display model where practical rather than relying on labels such as “standard” or “comfort height”.
Close-coupled toilets have the cistern attached to the pan. Back-to-wall suites conceal more external pipework. If you are considering wall-hung pans and concealed cisterns, account for the structural frame, wall depth and future service access.
For easier cleaning, consider a rimless bowl, smooth or skirted pan sides, minimal exposed pipework and accessible or removable seat hinges. Check that replacement seats and internal parts are available.
Compare water use, flushing and installed scope
The Australian WELS label displays a toilet’s water-efficiency star rating and water-consumption figures. More stars indicate greater water efficiency, but do not guarantee better flushing. Understanding how to choose a water-efficient toilet using its WELS rating makes it easier to compare the stated flush volumes with credible product specifications and warranty terms.
Allow for the complete installation, not only the toilet. Moving the waste outlet or water inlet, or altering walls and floors, can substantially increase the work required. Contact our Sydney toilet installation team before you buy so a licensed plumber can confirm the trap type, measurements, model compatibility and site-specific quote.