Drywall is one of the cleanest takeoffs in the trades: measure the area, divide by the sheet, add waste. The hard part was never the math — it was measuring eleven rooms' worth of walls and ceilings with a tape.
From area to sheet count
Scanstead gives you wall area per room with doors and windows already subtracted, plus ceiling area from the floor plan. From there:
- Sheets — total area ÷ 32 sq ft for 4×8, ÷ 48 for 4×12, then add 10–15% for cuts
- Screws — roughly one pound per 500 sq ft of board hung
- Joint compound — about a gallon per 100–150 sq ft for a three-coat finish
- Tape — around 370 ft per 1,000 sq ft of board
Where the openings matter
Rule-of-thumb takeoffs usually ignore openings, on the theory that waste eats the difference. In a house with a lot of glass that is a real number — a wall of windows can be 30% of its own surface. Measured openings let you subtract honestly and then add waste on purpose, instead of hoping two errors cancel.
Ceilings change the price, not just the quantity
The floor plan carries ceiling area, but it also carries ceiling height. Anything over eight feet means staging, lifts, or a second hand, and that belongs in the labor line. Scanstead measures wall height per wall, so a vaulted great room shows up as a tall-wall number instead of a surprise on hanging day.
Two numbers, one walkthrough
Hang and finish price off the same area, so one scan feeds both. Add the room-by-room breakdown and you can price a partial job — basement only, kitchen only — without re-measuring anything.
Drywall bids are won on waste percentage. You cannot tighten waste if you were guessing at the area underneath it.