How to do a drywall takeoff, step by step

Step 1: Gather the sheets and the specs

You need more than the floor plans. Pull the architectural floor plans (wall locations and lengths), the partition types sheet (what each wall is made of — stud size, layers of board, rating, height), reflected ceiling plans if you're hanging ceilings, wall sections for heights that vary, and the Division 09 specs for board type, finish level, and anything unusual like abuse-resistant or moisture-resistant board. If this is your first read of the drawings, our takeoff basics guide covers the general discipline; this article assumes it and goes trade-deep.

Sort walls by partition type before you measure anything. A takeoff of "2,400 LF of wall" is useless; a takeoff of "1,100 LF of Type A, 800 LF of Type B, 500 LF of Type C" is an estimate waiting to happen, because each type carries its own recipe.

Step 2: Verify the scale

Before the first measurement, check the stated scale against a printed dimension — a door opening, a grid line spacing, anything with a number on it. PDFs get re-plotted at half size constantly, and a half-size sheet doubles every length and quadruples every area. Check every sheet, not just the first one; architectural sets routinely mix scales, and enlarged plans are never at the base scale.

Step 3: Measure wall runs in linear feet

Trace each wall run along its centerline, one partition type at a time. Measure through door openings — you'll deduct openings later, and studs and track largely run through or around them anyway. Keep separate totals per partition type and per height if heights vary. When you finish a type, mark it visually (color per type is the classic method) so you can see at a glance what's been captured and what hasn't.

Step 4: Convert LF to SF by height

Wall area = length × height × number of faces. A 9'-0" partition boarded both sides yields 18 SF of board per linear foot. Watch for walls that stop at the ceiling versus walls that run to deck — the partition types sheet tells you which, and the difference on a 9' ceiling under a 14' deck is more than 50% more board on those runs.

Step 5: Deduct openings honestly

Pick a policy and apply it everywhere. A common, defensible one: deduct openings larger than a door (storefronts, borrowed lites, big pass-throughs) at full area on each affected face; ignore standard doors and small openings, because the labor to cut, frame, and finish around them costs as much as the board you saved. Whatever you choose, write it down — an unstated deduction policy is where two estimators' numbers quietly diverge.

Step 6: The material math

Now the LF and SF totals become an order list. Here's the full chain for a clean example: 500 LF of 9'-0" interior partition, 3-5/8" metal studs at 16" o.c., one layer of 1/2" board each side, doors ignored per the policy above.

Two notes on that table. The stud count starts from the spacing rule (16" o.c. means 0.75 studs per LF) and then adds real-world extras: doubled studs at door jambs, extra studs at corners and intersections. And the waste percentages are starting points, not laws — 12' sheets on 9' walls waste less than 8' sheets on 9' walls, and chopped-up floor plans with lots of short runs waste more than long clean corridors. Adjust to the geometry in front of you.

Step 7: Labor hours

Labor = quantity ÷ production rate. Keep hanging and finishing separate, because different crews (and often different subs) do them. If your hangers average 35 SF per man-hour on standard 9' partition work, the example's 9,000 SF is about 257 hanging hours; if your finishers run 45 SF per man-hour to a Level 4 finish, that's another 200 hours. Framing is usually rated per LF instead. Use your historical rates — production rates from a book are a starting guess, and the spread between a book rate and your crew's real rate is exactly the margin you'll win or lose.

Add the modifiers honestly: high work off lifts or scaffold, occupied buildings, small scattered rooms versus open floors, rated assemblies with more fastener inspection. Each one is a multiplier on the base rate, and they compound.

Step 8: Price it

Extend materials at current supplier pricing (board pricing moves; requote it per bid, don't carry last quarter's number), extend labor at loaded wage rates, then add equipment (lifts), overhead, and margin. Present the bid by partition type with quantities shown — a GC who can see 500 LF of Type C at a unit price trusts the number, and you can re-price addenda in minutes instead of hours.

Where software carries the math

Everything above is doable with a scale ruler and a spreadsheet — estimators priced drywall that way for decades. What software changes is who carries the chain. In Groundwork Takeoff, that whole table is an assembly: you trace the wall run once with the Linear tool, and the assembly converts LF to board, studs, track, fasteners, tape, mud, and labor hours — each with its own waste factor — in the live estimate grid as you draw. The Assembly Builder lets you encode your partition types once, with your production rates and your waste factors, so the recipe math stops being a bid-day activity. Smart scale detection handles Step 2, snap keeps wall traces on the wall, and the formula evaluator means you can type 500*9*2 straight into a quantity field when you just need to check a number. When the quantities are done, the estimate exports to Excel in one click. It's $95/seat/month with a 14-day trial, no card — bring a real partition plan and run this exact example.