Planning and Measuring
How to Measure for a Pocket Door
Accurate pocket door measurements begin with more than the doorway. You must measure the door panel, the full framed opening, the wall depth, the clear pocket area, and the finished floor height. This guide walks builders and homeowners through each measurement before framing or ordering a kit.
The most important ordering rule: Order a pocket door frame kit by the actual width and height of one door panel, not by the rough-opening size.
Example: For one 36-inch-wide by 80-inch-high door, order a 36-inch by 80-inch single frame kit. For a double opening with two doors of that size, order a 36-inch by 80-inch double frame kit.
Use the frame kit instructions before framing. The formulas on this page are useful for planning HBP systems, but rough openings can vary by manufacturer, model, wall construction, track, jamb design, and operating hardware. The dimensions supplied with the exact kit always take priority.
Measurements You Need Before Ordering
Door width and height
Measure the actual slab from edge to edge. Measure width across the top, center, and bottom; measure height at the left, center, and right. Record the smallest measurement if an existing door is not perfectly square.
Door thickness
Measure the panel at several points, avoiding decorative profiles. Common interior doors are 13⁄8 or 13⁄4 inches thick. The guide, pull, lock, hanger plates, and frame must all fit that thickness.
Complete door weight
Use the door maker’s published weight or weigh the completed panel. Include glass, mirrors, applied trim, pulls, locks, and other attached material. Choose a track and hangers rated above the complete operating weight.
Wall construction and depth
Identify whether the framing is 2 × 4 or 2 × 6, then measure the completed wall from finished face to finished face. Include drywall, plaster, tile, paneling, and other permanent finishes.
Clear wall length
Measure the doorway plus the wall area into which the door will slide. The pocket side needs uninterrupted length for the entire panel, frame members, stops, and jamb details.
Finished floor height
Establish the top of the completed flooring—not just the subfloor. Account for underlayment, tile, hardwood, carpet, or a threshold so the installed door will clear the final surface.
How to Calculate the Rough Opening
The rough opening is the framed space that receives the pocket door frame, header, and track. It is not the same as the visible doorway after jambs and trim are installed.
Single pocket door
HBP planning width: (door width × 2) + 1 inch HBP planning height: door height + 41⁄2 inchesExample: A 36 × 80-inch door requires a planning rough opening of 73 inches wide by 841⁄2 inches high: (36 × 2) + 1 = 73, and 80 + 41⁄2 = 841⁄2.
Double pocket doors
A double pocket door uses two panels that retract in opposite directions and meet at the center. HBP double systems use two compatible frames joined with a converging-door kit.
HBP planning width for equal doors: door width × 4 HBP planning height: door height + 41⁄2 inchesExample: Two 36 × 80-inch doors require a planning rough opening of 144 inches wide by 841⁄2 inches high: 36 × 4 = 144, and 80 + 41⁄2 = 841⁄2.
Do not add the two door widths when selecting the kit size. Two 36 × 80-inch doors use a 36 × 80-inch double pocket door frame kit. Confirm the center connection, stops, and meeting-door hardware before framing.
HBP Rough-Opening Planning Chart
Use this chart only as an early planning reference for equal-width HBP doors. Verify the exact product instructions before construction.
| Door panel size | Single rough opening | Double rough opening | Kit size to order |
|---|---|---|---|
| 28 × 80 in. | 57 × 841⁄2 in. | 112 × 841⁄2 in. | 28 × 80 in. |
| 30 × 80 in. | 61 × 841⁄2 in. | 120 × 841⁄2 in. | 30 × 80 in. |
| 32 × 80 in. | 65 × 841⁄2 in. | 128 × 841⁄2 in. | 32 × 80 in. |
| 34 × 80 in. | 69 × 841⁄2 in. | 136 × 841⁄2 in. | 34 × 80 in. |
| 36 × 80 in. | 73 × 841⁄2 in. | 144 × 841⁄2 in. | 36 × 80 in. |
| 42 × 80 in. | 85 × 841⁄2 in. | 168 × 841⁄2 in. | 42 × 80 in. |
| 48 × 80 in. | 97 × 841⁄2 in. | 192 × 841⁄2 in. | 48 × 80 in. |
For 84-inch doors, the HBP planning rough-opening height is 881⁄2 inches. For 96- inch doors, it is 1001⁄2 inches.
Check the Entire Pocket Wall
A correct opening measurement does not guarantee that the wall can accept a pocket door. Inspect or scan the full pocket area on both sides of the proposed opening.
- Plumbing: supply lines, drains, vents, valves, and shower plumbing usually must be relocated outside the pocket.
- Electrical: wiring, switches, receptacles, and standard electrical boxes can conflict with the moving door and thin pocket framing.
- Heating and cooling: ducts, returns, registers, and hydronic lines need a different route.
- Structure: load-bearing walls, headers, braced-wall panels, posts, and shear requirements may require a qualified builder or engineer.
- Wall-mounted items: cabinets, shelves, grab bars, televisions, tile backer, and heavy fixtures require planned support and safe fastener locations.
Fastener warning: Screws or nails that extend into the pocket can scratch, block, or puncture the door. Mark the pocket on both wall faces and plan drywall, trim, cabinet, and accessory fasteners before closing the wall.
Measure the Opening in Three Places
- Width: measure near the top, middle, and bottom of the proposed rough opening.
- Height: measure at the left side, center, and right side from the final floor elevation.
- Square: compare diagonal corner-to-corner measurements. Matching diagonals indicate a square opening.
- Plumb: check both sides vertically with a long level.
- Level: check the header and track location. An out-of-level track can make the door roll on its own or meet the jamb unevenly.
- Straightness: sight or string-line the pocket framing so bowed or twisted members do not narrow the door path.
Finished Opening vs. Rough Opening
The rough opening holds the hidden frame and track. The finished clear opening is what remains after the door jambs, stops, trim, pull position, and door overlap are established. If an accessibility requirement or minimum passage width matters, measure and specify the required finished clear opening first, then select a door and frame system that can provide it.
Do not assume that a door labeled 36 inches will always provide a full 36-inch clear passage. The exact clear width depends on how far the panel retracts, whether the pull must remain exposed, and the jamb and stop layout.
Before You Place the Order
- Single or double door configuration
- Actual width of each door
- Actual height of each door
- Door thickness
- Complete door weight
- 2 × 4 or 2 × 6 wall framing
- Completed wall thickness
- Required finished clear opening
- Final flooring elevation
- Available pocket-wall length
- Utilities and structural conflicts
- Passage or privacy hardware
- Soft Close, Soft Open, or push release
- Exact kit instructions reviewed
Common Measuring Mistakes
- Ordering the kit by rough-opening dimensions instead of actual door size.
- Ordering a double kit by the combined width of both doors.
- Measuring from the subfloor and forgetting the finished flooring.
- Checking only the doorway and not the wall area that forms the pocket.
- Ignoring door thickness, weight, locks, pulls, glass, or applied trim.
- Assuming the rough-opening formula is identical for every brand or model.
- Framing before reviewing the exact kit and installation instructions.
HBP Pocket Door Products
After recording your measurements, compare the door size, wall construction, weight, and operating features with the specifications for the exact system.