Area is where a tile order begins, not where it ends. Between the measured area and the boxes that should arrive on site sit the cuts, the pattern, the shape of the room and a small reserve you will be grateful for years later. None of it is complicated, but it has to be decided before the order goes in — because a top-up from a later production batch will not match what is already on your floor.
The working allowances
For a straight, grid layout in a simple rectangular room, plan 7–10% over the measured area. For a diagonal layout, or a room with columns, niches, alcoves and multiple doorways, 12–15% is more realistic. Herringbone, chevron and other angled patterns cut the most: 15–20% is normal, because every piece at the perimeter is cut twice.
Larger formats push the figure up rather than down. A cut taken off a 600x600 tile wastes a small offcut; the same cut across a 1200x1800 piece can waste most of a tile, because what remains is rarely usable elsewhere in the room.
Why the layout drawing changes the number
A drawn layout is what converts area into an honest quantity. It fixes the starting line, decides where full pieces land and where cuts fall, and reveals whether a room can be set out so that offcuts from one wall serve the opposite one. Two identical rooms can differ by several boxes purely on where the layout begins.
The drawing also protects the look of the finished floor. Without it, a room is often started from one corner and ends with a sliver against the most visible wall. With it, the sliver moves under the wardrobe. Ask for the layout before ordering — it is a planning step, not a formality.
Shade, calibre and the batch reserve
Porcelain and ceramic are fired in batches, and colour and size vary slightly between them. Every box carries a shade and calibre code, and all material for one continuous area should come from the same codes. This is why a mid-job top-up is risky: the new boxes may be a visible half-tone different across the same floor.
Keep a reserve after handover — for most homes two to three square metres per material, or a full box of anything used in a small area. Store it flat, indoors and dry. A cracked tile after a dropped pot is a fifteen-minute repair with matching stock, and a very unhappy conversation without it.
What else belongs in the order
Skirting, if it is being cut from the same tile, consumes floor tiles and must be counted separately — running metres converted back into pieces. Steps and risers need extra for mitres. Wall and floor quantities are calculated separately even when the material is the same, because the layouts differ.
Confirm the piece count per box and the coverage per box rather than working in area alone: boxes ship in whole units, and a quantity that rounds up half a box is simply half a box of reserve you did not have to plan for.
How we work it out
At the studio we take the area statement or the architect's drawing, apply the allowance that fits the actual layout and pattern rather than a blanket percentage, add the skirting and step material, and reconcile the total to whole boxes with the batch reserve included. It takes about twenty minutes across a table and removes the most common cause of a stalled site. Bring the drawings to Sector 82, Mohali, or read our tile size guide first if the format is still open.
