The Decision That Actually Gets Made
Ask a developer why they picked wall-hung and the answer is usually about appearance. Ask their builder and you get a different answer, because the builder is the one who has to sequence it.
A wall-hung carrier frame is a steel structure that carries the pan and the person using it. It has to transfer a minimum vertical load of around 400kg into the floor slab rather than lean on the partition, it bolts to the floor and ties into the studs, and it must be set level and plumb before any lining goes on. That puts it in the rough-in programme, not the fit-off programme. Rough-in alone runs two to three hours per unit before anyone touches a tile.
A floor mounted pan does none of that. The weight goes straight into the slab. The cistern still hides inside the cavity, so the visible result is the same clean line with no exposed pipework, but the partition is only concealing a cistern rather than carrying a load. Connect to the floor waste, set the cistern into the cavity, seal the base. About half a day.
Across the industry, total installed cost for a hung unit runs three to five times a floor-mounted equivalent once you count the frame and the labour. The pans themselves are comparable. The difference is almost entirely build programme.
That is the whole specification argument, and it is why floor mounted keeps surviving value engineering while wall-hung keeps getting cut from it.
Scenario One: Powder Rooms in New Houses and Townhouses
Selection logic
Under the ABCB Livable Housing Design Standard adopted in NCC 2025, at least one sanitary compartment on the ground or entry level has to provide 1200mm by 900mm of clear circulation space measured from the front edge of the pan, clear of the door swing, with 900mm clear between opposing walls. In a powder room that is usually the tightest room in the dwelling, so projection is doing real work. A shallower pan moves the compartment wall and gives the space back to the hallway or the stair.
Common error.
Specifying a 650mm to 700mm pan because it was the standard line item on the last project, then discovering at documentation stage that the compartment needs 1850mm to 1900mm of depth to comply. The pan gets swapped late, which is when substitution approvals and lead times start hurting.
What we recommend.
A compact floor mounted pan in the 480mm to 550mm band, paired with an in-wall cistern sized for 90mm stud framing so the partition does not need building out. Our FI-05 sits at 520mm plan projection, 425mm base footprint, 360mm wide.
Scenario Two: Compact Ensuites in Apartment Stock
Selection logic.
Apartment ensuites are usually carved out of the bedroom envelope, which means every millimetre of projection is competing with wardrobe depth on the other side of the partition. The cistern still needs to disappear, because an exposed cistern in a small ensuite reads as budget stock and shows up in sales feedback. A back to wall floor mounted toilet resolves both without asking the structure for anything.
Common error.
Assuming the apartment slab can take a wall-hung frame anywhere the architect draws it. On post-tensioned slabs the fixing positions are constrained, and the frame has to bolt to the floor. Every relocation becomes an RFI.
What we recommend.
The same compact pan, plus the matched cistern and button plate supplied together rather than sourced separately. When the pan comes from one supplier and the cistern from another, connection geometry mismatches surface on site and nobody owns the problem.
Scenario Three: Multi-Unit Projects Under Value Engineering
Selection logic.
When a project goes over budget, sanitaryware is an early target because it looks like a finish rather than a system. The hung option is usually the first thing cut, and the substitute has to keep the concealed look without triggering a redesign of the partition. A back to wall floor mounted toilet on the same set-out band does exactly that.
Common error.
Cutting wall-hung after the frames are already in the rough-in package. At that point the saving is partly gone. The time to make this call is at design development, when the wall type is still a drawing rather than a delivery.
What we recommend.
Decide the mounting method before documentation closes and stock one compact model across the whole floorplate. On a 60-unit building running two compliant compartments each, standardising the pan is 120 identical set-outs instead of a schedule of variations.
Three Procurement Mistakes We See
Comparing base footprint against plan projection. These are different numbers on the same pan and they can differ by 80mm or more. On FI-05 the base measures 425mm while the plan projection is 520mm. The code measures from the front edge, so 520mm is the figure that goes in the calculation.
Buying the pan and the cistern from different suppliers to save a few points. It works until the connection geometry does not line up on site, at which point the saving is consumed by one variation.
Treating the set-out as flexible. It is not. Ours is fixed at 180mm S-trap, which is outside the 100mm to 120mm band common to Australian floor-outlet pans. That is deliberate. FI-05 is built for projects where the drainage is set from the drawing before the slab is poured, and we say so rather than let a builder find out. If the waste is already in the ground, this is the wrong model and we will tell you at quotation.
What We Supply Into These Scenarios
We make these in our own plant in Tangshan on 309 forming lines, with tunnel kilns at 126 metres by 3.2 metres and two more at 82 metres by 2.8 metres. The kiln width is what keeps glaze colour consistent between the first container on a project and the fourth, which matters when a building is delivered in stages and the display unit was fitted out eight months before level nine.
Every pan is water tested before packing, not sampled. Cartons are 5-layer corrugated with moulded EPS, palletised or crated in timber. MOQ is 50 pieces per model, production runs 35 to 45 days, and full set-out drawings go out with every quotation so the hydraulic consultant can check compliance before anyone commits.
The product for these scenarios is our back to wall compact toilet, Model FI-05, available as a pan on its own or matched with our in-wall cistern and button plate.
FAQ
Q: Does a floor mounted pan look different to a wall-hung one?
A: From the front, barely. Both hide the cistern in the wall and both sit flush to the finished face. The visible difference is that the floor mounted pan meets the floor, so you lose the floating line and the clear floor underneath. Everything else, including the flush plate, is the same.
Q: Can we still use an in-wall cistern with a floor mounted pan?
A: Yes, and that is the point. The cistern sits in the cavity as normal. What you are not installing is a load-bearing carrier frame, because the pan carries its own weight into the slab.
Q: Is this suitable for a bathroom replacement in an existing building?
A: Not this model. FI-05 runs a fixed 180mm S-trap set-out, which sits outside the range common to existing Australian installations. Specify it where the drainage is set from the drawing.
Q: What lead time should we build into the programme?
A: Thirty-five to forty-five days production from deposit and approved artwork, plus shipping. For staged projects we hold moulds between runs so later stages match the first.
