Standard Stud Spacing
Studs are usually 16 inches on center. Some walls allow 24.
By Jonathan West · reviewed 2026-10-14 ·how we research these
Wall studs are most often spaced 16 inches on center, and 24 inches on center is allowed in some cases. Which figure applies depends on whether the wall is a bearing wall, how many floors sit above it, the stud size, and the thickness of the drywall or sheathing. Local code governs the final choice, and adoption and amendments vary by locality.
The 2018 Seattle Residential Code is the residential code adopted in one jurisdiction, and it is based on the International Residential Code. It supplies the bearing and nonbearing wall table. The American Wood Council gives exterior-wall guidance, and the Gypsum Association sets drywall spacing in GA-216-2010. Zircon covers stud finding, and a Journal of Light Construction Q&A reports how framers size precut studs. The Journal piece records framers' accounts. It is not a published standard.
Standard Stud Spacing: 16 vs 24 Inches
Exterior walls are normally framed at 16 inches on center, and 24 inches is allowed for the listed cases. The table gives each figure with its source.
Each row is a maximum or a default from one source. Adoption and amendments vary by locality, so the code that applies to a wall depends on where it is built.
| Situation | Spacing on center | Source |
|---|---|---|
| Exterior walls, typical | 16 inches | American Wood Council: normally 16 inches in exterior walls |
| One-story building, 2x4 studs, sheathing or siding thick enough to bridge | 24 inches | American Wood Council |
| Bearing wall, 2x4 studs, 10 ft height, roof and ceiling or habitable attic only | 24 inches | Seattle Residential Code, Table R602.3(5) |
| Bearing wall, 2x4 studs, 10 ft height, one floor plus roof and ceiling | 16 inches | Seattle Residential Code, Table R602.3(5) |
| Bearing wall, 2x4 studs, 10 ft height, two floors plus roof and ceiling | Not permitted (no value listed) | Seattle Residential Code, Table R602.3(5) |
| Bearing wall, 2x6 studs, 10 ft height, two floors plus roof and ceiling | 16 inches | Seattle Residential Code, Table R602.3(5) |
| Nonbearing wall, 2x4 studs, 14 ft height | 24 inches | Seattle Residential Code, Table R602.3(5) |
| Nonbearing wall, 2x3 studs, 10 ft height, not exterior | 16 inches | Seattle Residential Code, Table R602.3(5) |
| Gypsum wallboard, 3/8-inch panels, single layer on walls | 16 inches maximum | Gypsum Association, GA-216-2010 Table 1 |
| Gypsum wallboard, 1/2-inch panels, single layer on walls | 24 inches maximum | Gypsum Association, GA-216-2010 Table 1 |
| Bottom story, three-story building, exterior walls | 16 inches maximum, studs at least nominal 3x4 or 2x6 | American Wood Council |
Why 16 Inches on Center Is Common
Sixteen inches on center is the common default. Drywall and sheathing both limit how far apart studs can be.
The Gypsum Association's Table 1 ties wall spacing to panel thickness. Three-eighths-inch panels on walls allow 16 inches on center at most, while 1/2-inch and 5/8-inch panels allow 24 inches on center for single-layer walls. These figures are from the 2010 edition of GA-216. Newer editions exist, so verify the current one.
Zircon's how-to says standard household walls use 5/8 to 3/4 inch drywall (Zircon's description), with studs spaced every 12, 16 or 24 inches. Thicker drywall tolerates wider framing spacing.
Sheathing matters on exterior walls. The American Wood Council says 24-inch spacing of 2x4 studs is acceptable in one-story buildings if the wall sheathing or siding is thick enough to bridge across studs.
The Gypsum Association spacing governs drywall attachment only. Framing still has to meet design or building-code loading requirements, and the Gypsum Association says so in the same document.
When 24 Inches Is Used
- The 2x4 studs support a roof and ceiling or a habitable attic only, with no floor above, at a 10 ft laterally unsupported height.
- A habitable attic assembly on 2x4 studs is limited to a 32 ft roof span, beyond which the studs go to 2x6 or an engineered design.
- The wall is sheathed on at least one side, or it has bridging not more than 4 feet apart vertically.
The sources here do not identify any particular wall, so they cannot tell you whether a given wall is a bearing wall. Do not treat any wall as non-bearing from this table. Confirm with your local building department or a licensed structural engineer.
How Spacing Is Measured
Spacing is measured center to center. A 16-inch figure means the centers of neighboring studs sit 16 inches apart.
Heights are measured differently. The Seattle table's heights are distances between points of lateral support, measured perpendicular to the wall.
Finding Studs
Zircon's how-to says to calibrate its finder on the wall by holding the power button until it beeps and shows 'stud'.
Zircon says to mark all three points the finder shows: the left edge, the center and the right edge. It also says to always fasten into the center of the stud. Center-finding models detect all three points in one pass.
Studs repeat at regular intervals measured from a corner. Windows, doors and corners add extra studs, so a regular pattern from one corner does not place every stud.
Electrical and plumbing can sit in stud bays.
Doors, Windows and Corners
Windows, doors and corners each add extra studs beyond the regular spacing.
The sources here give no count or size for those extra studs, so the number of studs at a particular opening is not covered.
When to Ask an Engineer or the Building Department
Whether a wall is load-bearing, and which spacing applies, is for your local building department or a licensed structural engineer to confirm. Do not assume a wall is non-bearing before cutting or moving studs.
The table changes row with the load. Bearing walls carry roof and floor loads, so the allowed spacing tightens as more floors sit above. Adding a second floor above a 2x4 bearing wall moves it from the one-floor row to the two-floor row, where Seattle's table lists no value and 2x4 studs are not permitted at 10 ft.
Adoption and amendments vary by locality, and this section does not include the code for any address. The Seattle text is one jurisdiction's adopted code, and the code for a different city or county may set different figures.
Common questions
How far apart should studs be?
Sixteen inches on center is the common default, and 24 inches on center is allowed for some walls. The allowed figure depends on whether the wall bears load, how many floors sit above it, the stud size and the thickness of the drywall or sheathing. Local adoption varies, so the code where you build governs.
Why is a precut stud 92 5/8?
A lead framer quoted in the Journal of Light Construction Q&A says precut studs for 8-foot walls are 92 5/8 inches, which gives roughly 97 1/4 inches of wall framing height with three plates. The framer reports that this lets two 4-foot drywall sheets butt the ceiling and clear the floor by about 1/2 inch. Framers in other regions use other lengths, such as 93 inches in parts of the South and 92 1/4 inches in parts of California.
Are outlets always on studs?
Electrical and plumbing can sit in stud bays, but the sources here do not say how every outlet box is fastened. Use a stud finder to see what is behind the wall.
Can I drill into a drywall without a stud behind it?
Electrical and plumbing can sit in the stud bay, so check before you drill. Zircon's how-to says to always fasten into the center of the stud.