Start by establishing a true straight reference line that will govern the entire first row of kitchen floor tile.

Begin at the most visible wall or entry where the first row will be seen and place a full tile with the appropriate spacer against that wall, leaving the intended expansion joint gap. Mark the tile edge on the wall with a pencil and measure from that mark perpendicular to the opposite wall at several points to confirm parallelism; if the room is out of square use the most visible sightline as your priority. Transfer the same mark across the room by measuring from fixed features such as a cabinet toe kick or a permanently fixed door frame so the line is consistent along the length. Drive small finishing nails in the floor at two points aligned with your transferred marks to act as anchor points for a chalk line; make sure the nails sit low enough to avoid interfering with tile placement. Snap the chalk line and then dry lay a few tiles along that line with spacers to verify the layout and how edge cuts will fall at the far wall; adjust the chalk line slightly if tile cuts would create very small slivers at visible edges. Once satisfied, lift the dry-laid tiles and use the snapped chalk line as your mortar guide to install the first row, checking each tile for level and plumb as you proceed.

Common mistakes are starting from the wrong wall which leads to uneven visible edge cuts, not measuring from consistent fixed points which causes the line to drift, and failing to verify the line with dry-laid tiles so surprises appear later. If you start from the wrong wall, shift to the most visible sightline and reestablish the reference using the pencil mark and chalk line technique. If measurements are inconsistent use permanent features like cabinet faces or door frames as repeatable reference points and recheck distances at multiple locations. If you skip a dry layout, always dry-lay at least the first row with spacers to preview cuts and spacing and adjust the snapped line before setting with mortar.

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