Drywall Estimating: Per Sheet vs Per Square Foot (and When Each Wins)
There are two ways to bid a drywall job and they're not interchangeable. Per-sheet bids win on simple commercial fit-outs. Per-square-foot bids win on residential remodels with vaulted ceilings, soffits, and "while you're at it" requests. Mixing the two — bidding per sheet on a high-waste job — is how drywall contractors lose money on jobs they should win.
When per-sheet wins
A 30,000 sq ft tenant fit-out with 8-foot uniform ceilings, metal stud at 16" OC, and rectangular rooms is a per-sheet job. The waste factor is 6-8%. The crew can hang 200 sheets in a shift. The cost structure is:
- 1/2" std drywall: $13-$16 per 4x8 sheet
- Labor (hang + tape + texture): $42-$58 per sheet
- Mud, tape, screws: $3.50 per sheet
- Subtotal: $58.50-$77.50 per sheet
- Markup 30%: $76-$101 per sheet bid
Bid that job at $1.85/sq ft and you're at $55,500 against a job that costs you $48,000-$55,000 to execute. Tight, predictable, profitable.
When per-square-foot wins
A residential remodel with vaulted ceilings, butted corners, archways, soffits, and tray ceilings is a per-square-foot job. The waste factor jumps to 12-18%. The labor productivity collapses to 40-60 sheets per crew-day instead of 200. Bid that job per sheet and you'll be at $24-$28/sq ft against a job that actually costs you $7-$9/sq ft to execute and runs three days longer than you budgeted.
The honest residential per-sq-ft number for a complex remodel:
- Material with waste: $0.55-$0.75
- Hang labor: $0.85-$1.30
- Tape + texture: $1.20-$1.80
- Trim work (corners, archways): $0.40-$0.90
- Markup 35%: total $4.50-$5.90/sq ft
The waste factor
Waste is the variable contractors get wrong the most. The default 10% works for a clean rectangular room with one door. It's wrong for:
- Vaulted ceilings (jump to 15-18% — angle cuts are waste)
- Lots of small rooms (12-15% — every doorway is a cut)
- Soffit work (20%+ — small pieces eat sheets)
- Specialty boards (1/2" + 5/8" mixed; 12% to handle the separate stocking)
The contractors winning residential drywall bids bid waste honestly. The contractors losing bids assume 10% and eat the difference.
How Estimate.Pro handles it
Estimate.Pro carries drywall as a trade-specific template — you pick per-sheet or per-square-foot bid mode at the project level. The waste factor adjusts automatically based on the room geometry captured in AR measurement. The cost library carries 1/2", 5/8", moisture-resistant, and abuse-resistant boards as separate SKUs so the bid prices the actual product, not the default.