Framing lumber for a straight 12-foot interior wall — 14 studs, 5 plate boards, 3 sheets of sheathing — runs about $166 at box-store prices. Hand the same wall to a pro and the installed number lands between $25 and $64 per linear foot with drywall, so $300 to $768 finished. Here's the arithmetic that gets you from wall dimensions to a lumber list to a check amount.
The count follows three rules. Studs: length in inches divided by spacing, plus 1 for the stud at the end, plus extras — corners want 3 or 4, tees 2 or 3, and each opening a king and a jack per side. Plates: three times the wall length on a bearing wall (one bottom, doubled top). Sheathing: wall area divided by 32 square feet per 4×8 sheet, rounded up, with openings left in because the offcuts get used.
| Wall length | Base studs @ 16 in OC | + 4 extras | Plate boards (3× length) | 4×8 sheets | Lumber @ $4 / $4 / $30 |
|---|---|---|---|---|---|
| 8 ft | 7 | 11 | 3 | 2 | $116 |
| 12 ft | 10 | 14 | 5 | 3 | $166 |
| 16 ft | 13 | 17 | 6 | 4 | $212 |
| 24 ft | 19 | 23 | 9 | 6 | $308 |
The price column uses $4 per stud and plate board and $30 per sheathing sheet — in line with current big-box numbers, where precut studs run about $4.25 at Menards and $4.65 at Home Depot, with contractor yards nearer $6. Add 5 to 10 percent for culls: crowned plates, swept studs, and the piece cut wrong late in the day. Framers who order exact make one extra lumberyard run per house.
HomeGuide's 2026 numbers put a professionally built wall at $25 to $64 per linear foot including framing and drywall, with typical projects landing between $1,000 and $5,000 total. Framing without the drywall runs closer to $18 to $24 a foot, and Angi clocks interior walls with drywall at $20 to $30 a foot. Multiplied out:
| Wall length | Framing only ($18-$24/LF) | Framed + drywalled ($25-$64/LF) |
|---|---|---|
| 12 ft (one interior wall) | $216-$288 | $300-$768 |
| 24 ft (basement run) | $432-$576 | $600-$1,536 |
| 40 ft (two long room walls) | $720-$960 | $1,000-$2,560 |
The spread inside those bands is real, not noise. Region first — the same wall costs half again more in a coastal metro than in the Midwest. Then wall type: bearing walls carry doubled top plates, deeper headers, and more inspection; partitions don't. Openings multiply labor faster than they multiply lumber, because each one is six pieces fitted rather than two nailed on a layout. And the drywall figure covers hanging and finishing only — tape, mud, and texture are inside it, paint and trim are not.
Dropping from 16- to 24-inch spacing takes a 12-foot wall from 10 base studs to 7, a 30 percent cut in the biggest line item. So why is 16 the default? Panel math: 16 divides evenly into 48 and 96, so every plywood and drywall edge lands mid-stud without cutting. It's also the spacing most siding, sheathing, and drywall fastener schedules are rated for. At 24 inches you save lumber and gain insulation cavity width, but the wall's cladding ratings and drywall spanning need checking — between the two spacings, a system decision hides inside what looks like a count decision.
Where each belongs: 16-inch centers for bearing walls and anything carrying tile or heavy wall-hung fixtures; 24-inch for non-bearing partitions and advanced-framing designs, where the whole house is engineered around the wider spacing. On a single interior wall the lumber savings is about $12. Framing a whole basement at 24? That's real money.
Stud counts, plate boards, sheathing sheets, and cost from wall length, height, spacing, and extras.
Wall Framing Calculator →Material for a straight interior wall runs $116-$308 for lengths from 8 to 24 feet, a 12×12 room's four walls about $656, and professional framing with drywall $25-$64 per linear foot. The wall framing calculator turns your dimensions and spacing into the full list — studs, plates, sheets, cost. Once the walls stand, the drywall calculator sizes the sheets, tape, and mud that cover them, and the concrete block calculator prices the masonry alternative for foundation-level walls. For the lumber side of the budget, our lumber cost guide tracks stud and sheet pricing, and the drywall installation guide covers what the finish stages cost beyond the frame.
At 16 inches on center: 144 divided by 16 is 9, plus 1 for the starting stud = 10 base studs. Add the usual extras for corners and openings (4 is a working default) and you're at 14. At 24-inch spacing the base count drops to 7.
Four 12-foot walls at 16-inch centers take 56 studs, 18 eight-foot plate boards, and 12 sheets of sheathing — about $656 in lumber at $4 studs, $4 plate boards, and $30 sheets. Openings for a door add king studs, jacks, and a header on top of that.
At Angi's $7-$16 per square foot for house framing, a 2,000-square-foot home runs roughly $14,000 to $32,000 in labor and materials. Lumber is a smaller slice than most people guess - labor and region dominate the spread.
16 inches divides evenly into the 48- and 96-inch dimensions of plywood and drywall, so every panel edge lands on a stud — that alignment, plus strength, makes it the default for bearing walls. 24-inch spacing saves about a third of the studs and is common for non-bearing partitions and advanced framing.
2×6 studs and plates cost more per board than 2×4, but the deeper cavity fits R-19 to R-21 batts instead of R-13 to R-15. In cold climates the heating savings usually repay the lumber premium; in mild climates, 2×4 with good air sealing is the smarter buy.