1. Gather all the materials you’ll need: graph paper, pencil, eraser, measuring tape, and a calculator.
  2. Show all dimensions in inches. That way, 62″ will not be mistaken for 6’2″.
  3. Make all notations and drawings in pencil, so you can make changes easily.
  4. Remember that accuracy is of the utmost importance.
  5. Start with a rough drawing of the shape of the room. (You do not need graph paper for this drawing and it does not need to be drawn to scale.)
  6. Include doors, windows, breaks in the wall, and all obstructions. This drawing will not be to scale, but you’ll use it to log measurements. Begin measuring from a corner. Start three or four feet off the floor and measure to the first opening or obstruction.
  7. Note the measurement from corner to window casing, size of window casing, and the actual window opening within the casing.
  8. Measure the height from the floor to the window casing and ceiling to window casing.
  9. Continue to measure around the room in the same manner.
  10. Note the location and size of all electrical outlets, wall switches, and lighting fixtures.
  11. Show the location of all plumbing and gas connections.
  12. Measure the dimensions of appliances you plan to keep.
  13. Indicate in which direction doors swing and where they lead.
  14. Mark the location of all ducts, vents or radiators.
  15. Note any variances or special features that will affect your layout.
  16. Check your measurements for accuracy by adding your measurements for each wall and comparing them to the opposite wall.
  17. Now transfer your correct measurements to the 1/2 scale (1/2 equals 1′) on graph paper.
  18. Pick a starting point at the top of your graph paper. Refer to your measuring sheet and begin drawing the lines that represent walls, leaving spaces for doorways, and using shaded walls to represent windows. As each wall takes, shape, cross-check your layout with your measured sketch.
  19. Pencil in utility connections, ducts, outlets, and any other special obstacles or features in their respective areas.
  20. After you’ve checked (and double-checked) the measurements in your plan, copy it or use tracing paper overlays so you can experiment with a number of layouts without having to recreate the plan each time.