Bathroom Rough-In Checklist Before Ordering Fixtures

Choose bathroom fixtures with the plumbing and electrical layout in view. A toilet, shower mixer or vanity may look right in a catalogue and still fail to match the connections already built into the room. Confirm the exact model and installation drawing before concealed work is closed.

This is especially useful for overseas procurement, where replacing an incompatible valve body or ceramic fixture can take longer than revising a drawing before construction.

Match the toilet to the outlet

Record whether the waste outlet is through the floor or wall. Have the installer measure the relevant connection position from the finished surfaces and compare it with the selected model's drawing. Do not assume every country or manufacturer uses one universal rough in dimension.

For a wall hung toilet, coordinate the support system, concealed cistern, flush plate and service access as a compatible assembly. Check the wall construction and final finish thickness with the installer. The visible pan is only one part of the order.

Select concealed shower components together

Confirm the valve body, trim, outlets and operating arrangement. Check the permitted installation depth against the planned finished wall. Identify how the valve can be serviced and which components must arrive before tiling.

A change from a surface mounted mixer to a concealed system can affect more than appearance. It may require changes to the wall, pipework and product delivery sequence. Agree those changes before revising the order.

Coordinate the vanity and basin

Use the basin and faucet drawings together. Check spout reach, mounting position, outlet clearance and the space available below the basin for the trap. Drawers can conflict with plumbing if their internal arrangement is not coordinated.

Confirm the waste fitting type and whether the basin includes an overflow. A countertop opening should be based on the approved product template rather than a photograph or approximate catalogue size.

Plan electrical accessories early

Smart toilets, illuminated mirrors, demisters and heated towel rails may need power in particular locations. Give the local electrical installer the actual product ratings and connection instructions. Confirm voltage, frequency, wiring arrangement and the requirements applicable to the installation location.

Record which accessories need concealed connections and which use accessible connections. Leave service access where the manufacturer requires it; a seamless appearance should not make replacement impossible.

Verify destination documents by model

For Australia, WaterMark and WELS address different matters: plumbing product suitability and water efficiency respectively. Check the requirements applicable to each product through the Australian Government explanation of WaterMark and WELS. Use the WaterMark database to match relevant certification to the actual model.

A certificate shown for a different product is not a substitute for the correct model record. Other destinations require their own product and installation checks.

Approve one coordinated bathroom schedule

List every fixture, finish, connection drawing, included accessory and required delivery stage. Ask the plumbing and electrical installers to review their interfaces before placing the final order. Store the approved schedule with the construction drawings.

Can concealed fittings be selected after tiling?

Some changes may be possible, but they can require opening finished surfaces. Select the system before rough in work wherever practical.

What information helps a supplier check compatibility?

Send the bathroom plan, finished wall dimensions, outlet locations, site photographs and desired fixture models. Highlight any pipework or wiring that is already fixed.

One coordinated bathroom approval sheet

• Toilet: model, waste outlet position, support system and service access.
• Shower: compatible valve body and trim, outlets, installation depth and access.
• Vanity: basin and tap position, waste route and drawer clearances.
• Mirror or other powered accessories: connection requirements reviewed by the responsible installer.
• Drawing: room number, revision date, approved models and the person confirming compatibility.