Graph paper, Tabloid 11 × 17
Quarter-inch squares across an 11 × 17 inch sheet, with inch markers. Large enough to draw a whole floor at the standard architectural scale without taping pages together.
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A whole floor on one sheet
At the ¼ inch = 1 foot residential scale, a Letter sheet covers about 34 by 44 feet, which runs out partway through a typical house. Tabloid covers roughly 44 by 68 feet — most single-storey homes complete, with every room in correct relation to every other. Drawing a plan in one piece rather than across joined sheets is the difference between a drawing you can reason from and a jigsaw.
Getting it printed
Tabloid — 11 × 17 inches, called ledger when it is used in landscape — is standard in office copiers and at every print shop, and rare in home printers. If yours only holds Letter, print at 100% with tiling and join four sheets. The one thing to avoid is letting the driver scale it down to fit Letter, which quietly destroys the ¼ inch = 1 foot relationship that makes the sheet worth using at all.
The sheet for working in a group
A tabloid grid pinned to a wall is legible to a room; a Letter one is not. For workshop planning, laying out a market stall or an exhibition booth, arranging wargame terrain, or anything where two or three people draw on the same page at once, the extra area matters far more than the resolution does.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100% — not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.