How do I keep grout lines aligned through a doorway?

Carry one reference line through the opening and lay out both rooms from the same grid. Before setting tile, dry-lay a row with spacers across the threshold and check the cuts at the far walls of both rooms.

If a row is already set, use its actual joints to locate the grid. Measure the clear opening and the jamb position from that same reference. Check the transition detail for the job and preserve any required movement joint.

What changes if the doorway gets wider?

In this two-room example, the first four tiles were already installed. The tile size was 600 × 600 mm with 3 mm grout joints. The doorway was remeasured from 903 to 1103 mm while the left jamb and the grid stayed in place.

Tile R3-C3	Original	Revised
Lower-right notch	300 × 100 mm	100 × 100 mm
Bottom edge kept	300 mm	500 mm

Only R3-C3 (third row from the bottom, third column from the left) was flagged when the saved revision was reopened. The new shape needs 200 mm of material already removed from the old tile. Remeasure the jamb at the floor, then cut a fresh blank if the dimensions agree.

Open the R3-C3 cut sheet (PDF)

14-second silent iPad demonstration. The original plan and revised plan keep the first row in place. The cut comparison shows the smaller notch on the revised tile.

Reading the sheet at the saw

Place the blank face up with the same orientation as the plan. Read X from the finished left edge and Y from the finished bottom edge. The six numbered points describe the revised outline. Use the printed dimensions and confirm them on site before cutting. The measurements above belong to this example.