01
The quick answer
Choose single when…
You need a normal-width opening and have one usable pocket wall.
- One slab and track run
- Fewer moving and alignment points
- Usually simpler to frame and service
- Good for baths, closets, pantries, and offices
Choose double when…
You want a wide, centered opening and both side walls can hold pockets.
- Two slabs meet at center
- Balanced, formal appearance
- No large swing area
- Good for studies, dining rooms, and flexible living spaces
A double system does not store two doors in one standard pocket. Each slab normally travels into its own cavity on the opposite side.
02
Space and framing requirements
| Planning item | Single | Double |
|---|---|---|
| Door panels | One slab | Two equal or coordinated slabs |
| Pockets | One cavity | One cavity on each side |
| Clear wall | About one slab's storage length on one side, plus allowances | About one slab's storage length on both sides, plus allowances |
| Utilities | One pocket wall stays clear | Both pocket walls stay clear |
| Header | Spans the designed doorway and pocket assembly | Longer assembly spans both pockets and center opening |
| Closed condition | Door meets a strike jamb | Two leading edges meet |
Use the rough-opening chart for the exact frame, height, wall size, and configuration. A double frame is not always created by doubling a single-frame rough opening.
03
Hardware and operation
One moving assembly
One slab typically uses two hanger points, one guide, open and closed stops, and one pull or latch set.
Two matched assemblies
Each slab needs hangers, a guide, stops, and adjustment. Both must arrive at the same centerline and height.
Synchronized vs. independent
Standard double doors move independently. A synchronized system links them with a cable or belt so moving one panel moves the other. Synchronization feels polished but adds parts, setup, and service points.
Simpler hardware; either leaf can remain parked.
Both leaves move together and meet at center.
Each damper must suit its slab's width, weight, and travel.
04
Installation and alignment
Both systems need level running surfaces; double tracks must share one elevation.
A double opening has twice the cavity surfaces that must stay straight and clear.
Mismatched bottom gaps are especially visible where double leaves meet.
Double slabs must be parallel and meet without a step or wedge-shaped gap.
Stops keep edge pulls reachable and allow latches to engage without overtravel.
Before drywall, operate every slab fully and verify the center reveal. After flooring, repeat height, plumb, guide, stop, and latch adjustments.
05
Cost and complexity
A double system generally costs more because it uses more door material, frame length, running hardware, pulls, trim, and labor.
One slab, pocket, and operating set, with fewer finish and adjustment points.
Two slabs and pockets, paired hardware, longer framing, and more alignment time. Synchronization adds another layer.
“2×+” is a planning cue, not a price formula. Structural work, premium doors, rated walls, or utility relocation may dominate cost.
06
Which one fits the project?
07
What to specify before ordering
Select the frame from the manufacturer's configuration chart, then frame to that system. Do not frame first and assume a kit will fit later.
Ready to compare frame kits?
Bring the opening, wall, and door weight to the decision.
Use the product-specific sizing chart before final framing.