AvoGuide · square set vs cornice
Square set vs cornice: how to measure and price both
Square set and cornice are two ways to finish the joint where the wall meets the ceiling. Both are measured the same way — linear metres around each room at the ceiling line — but they are built and priced differently, so state which one is in the scope, room by room if it varies.
What each is
Cornice is a moulding fixed into the angle between wall and ceiling. Square set has no moulding: the wall and ceiling linings meet at a clean, set internal angle. In Queensland, fixing plasterboard and cornices both sit within the QBCC plastering drywall licence class.
How to measure both
Measure the perimeter of each room at the ceiling line, in linear metres. Include bulkhead edges and changes in ceiling height. Doors don’t interrupt the run unless an opening goes to the ceiling. For cornice, also count the corners: each internal and external corner needs a mitre.
What changes in the quote
Cornice brings material (lengths, adhesive) and mitres. Square set brings more setting work at the junction and less tolerance for poor framing. Price them as separate lines so a change of mind is a simple swap, not a re-measure.
Say it once, in the scope
“Square set to all rooms unless noted; cornice to [rooms].” One sentence in the inclusions avoids a common argument at handover.
Worked example
The made-up ground floor from the plasterboard guide: four rectangular rooms.
| Room | Perimeter (lm) | Corners (cornice mitres) |
|---|---|---|
| Bed 1 | 13.8 | 4 |
| Bathroom | 9.0 | 4 |
| Living | 19.2 | 4 |
| Hall | 12.0 | 4 |
| Total | 54.0 | 16 |