Single pocket door
One door, one pocket
(2 × W) + 1′′
Example: A 36′′ door needs a 73′′-wide rough opening.
36′′ + 36′′ + 1′′ = 73′′
Calculating the Required Wall Length
Planning & Measuring
Planning & Measuring
Calculating the Required Wall Length
A pocket door needs wall space for both the visible doorway and the hidden pocket. Use the formulas below to estimate the minimum framed span, then confirm the exact rough opening in the instructions for your selected frame kit.
01
Understand what the wall must hold
The rough opening is not just the clear doorway. It extends across the doorway and the full pocket where the slab rests when open.
Clear doorway areaHidden wall pocket
W
W
Minimum framed span
Important: “Required wall length” means the uninterrupted framed span needed by the system. Your room wall may need to be longer for corners, trim, switches, or other features.
02
Use the correct formula
Calculate from the actual door-slab width—not the width of an existing swing-door opening.
Double pocket doors
Two equal doors, two pockets
4 × W
Example: Two 36′′ doors need a 144′′ planning span.
36′′ × 4 = 144′′
W = the actual width of one door slab. These formulas reflect current HBP guidance. The exact kit instructions always control.
Wall-length calculator
Estimate your minimum span
Choose the configuration and enter the width of one door.
inches
Estimated minimum framed span73′′6 ft 1 in
Planning estimate only. Verify the exact frame-kit instructions before framing.
03
Common door-width examples
All measurements are minimum planning widths in inches.
| Width of each door | Single-door rough opening | Double-door planning span |
|---|---|---|
| 24′′ | 49′′ | 96′′ |
| 28′′ | 57′′ | 112′′ |
| 30′′ | 61′′ | 120′′ |
| 32′′ | 65′′ | 128′′ |
| 36′′ | 73′′ | 144′′ |
| 42′′ | 85′′ | 168′′ |
| 48′′ | 97′′ | 192′′ |
04
Check the wall in the field
A correct calculation does not guarantee that the wall can accept a pocket door.
-
1
Mark the full span
Measure across the doorway and into the pocket side; mark both ends on the floor and wall.
-
2
Measure at several heights
Check near the floor, at mid-wall, and near the header because existing walls may be out of plumb.
-
3
Inspect the entire pocket zone
The concealed path cannot share space with plumbing, standard electrical boxes, ducts, returns, or structural bracing.
-
4
Identify structural conditions
Do not alter a load-bearing or braced wall until the support has been designed by a qualified professional.
-
5
Reserve usable wall surface
Plan switches, cabinets, grab bars, shelves, tile backing, and trim. Fasteners must never project into the moving-door cavity.
05
Allow for more than the math
Corner clearance
Leave enough solid framing to form nearby corners and install finish material.
Casing and baseboard
The formula sizes the frame, not decorative trim or nearby cabinets.
Clear opening
The usable passage can be less than the slab width because of jamb overlap, stops, and an exposed pull.
Unequal double doors
Do not use the equal-door shortcut. Add the exact doorway, both pockets, and the selected system’s allowances.
!
Do not frame from a rule of thumb alone
Soft Close, Soft Open, push-release hardware, oversized doors, specialty tracks, and other manufacturers may require different travel or framing. Select the kit first, then follow its current instructions.
Ready to confirm your system?
Match the frame kit to the wall and door
Hartford Building Products offers single and double pocket-door frame kits for 2 × 4 and 2 × 6 wall construction.