An interior slab door is the door leaf supplied without a frame. Slab doors are useful when an existing frame is still in good condition and the replacement needs to match the opening, hinges, handing, and hardware.
Because a slab does not include the frame, correct measurement and preparation are especially important.
Slab vs. prehung interior doors
| Feature | Slab | Prehung |
|---|---|---|
| Door leaf | Included | Included |
| Frame | Not included | Included |
| Hinges | Usually separate | Usually installed |
| Best for | Reusing sound frame | Replacing complete assembly |
| Installation | More fitting required | More straightforward |
A slab can be a cost-effective replacement when the existing jamb is plumb, square, and structurally sound.
Common interior slab styles
Interior slab doors can use many designs:
- One-panel
- Two-panel
- Three-panel
- Five-panel
- Six-panel
- Shaker
- Flush
- Glass-panel
- French-style slabs
The style should match the surrounding trim and other doors when a consistent interior appearance is desired.
Glass-panel slab doors
Glass can be incorporated into an interior slab for borrowed light.
Common options include:
- Clear glass
- Frosted glass
- Reeded/fluted glass
- Decorative glass
- Divided-lite designs
A bathroom or bedroom usually benefits from privacy glazing, while a living room or office may use clearer glass.
Common sizes
Interior slab doors are commonly available around 24–36 inches wide and 80 inches high, with other sizes available for specific openings.
Do not assume the replacement slab should be the same nominal size as the opening. Measure the existing door leaf itself when the existing frame is being reused.
What to measure
For a slab replacement, record:
- Door width
- Door height
- Door thickness
- Hinge count
- Hinge positions
- Hinge size
- Hinge corner radius
- Lock bore diameter
- Backset
- Handing and swing
Also check whether the old slab has been trimmed.
Material options
Hollow core
Lightweight and economical for closets and secondary rooms.
Solid core
Heavier and often preferable where sound reduction and a more substantial feel matter.
MDF or molded
Consistent, paint-friendly, and available in many panel designs.
Solid wood
Premium appearance and strong customization potential, but heavier and usually more expensive.
When a slab replacement is not the best choice
Replace the complete frame instead when:
- The jamb is warped
- The frame is rotten
- The hinge screws no longer hold
- The opening is badly out of square
- The new door requires a different jamb depth
- The existing frame does not match the new door system
In these situations, a prehung unit can provide a more reliable replacement.
B2B specification
For multi-door projects, specify:
- Exact slab dimensions
- Thickness
- Material/core
- Panel profile
- Finish
- Glass
- Hinge preparation
- Lock bore/backset
- Handing
- Quantity
- Packaging
Jusen Door and Windows can manufacture custom interior door systems and project quantities with specified dimensions, finishes, glass, and OEM/ODM requirements.
FAQ
What is an interior slab door?
It is the door leaf without the surrounding frame.
Can I replace a prehung door with a slab?
Yes, if the existing frame can accept the new slab and the dimensions, hinges, and hardware are compatible.
Are slab doors cheaper?
The door leaf itself is generally less expensive than a complete prehung unit, but installation and fitting costs can reduce the difference.
Can slab doors have glass?
Yes. Glass-panel and French-style slab doors are common interior options.
