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Mobile home interior door sizes are not the sizes a home center stocks. They are narrower, shorter and — the detail that matters most — thinner: a 1⅜-inch slab rather than the 1¾ inches used in a site-built house.
That thickness difference is why a door that looks identical on the rack will not hang in your opening, and why the hinges and the strike plate will be wrong even if the width happens to match.
Here are the actual numbers and how to buy the right thing.
The mobile home interior door sizes you’ll actually find
| Dimension | Mobile home | Site-built |
|---|---|---|
| Width | 24″, 28″ or 30″ commonly; also 20″, 22″ and 32″ | 24″ to 36″, usually 30″ or 32″ |
| Height | 78″ to 80″ | 80″ standard |
| Slab thickness | 1⅜” | 1¾” |
| Weight | Lighter | Heavier |
The narrow widths are the ones people find surprising. A 24-inch bathroom door is entirely normal in a single-wide, and 20- and 22-inch doors exist for linen and utility closets.
Height is the sneaky one. A lot of manufactured homes use 78-inch doors where a site-built house uses 80. Two inches is not something you can plane off.
Why they’re built that way
Manufactured home walls are thinner than site-built walls — the framing is lighter and the cavity is shallower — so the door jamb is shallower too. A 1¾-inch slab in a 1⅜-inch jamb does not close.
The lighter construction is also deliberate. Everything in a manufactured home has to survive being towed down a highway, and weight is the enemy of that. Lighter doors mean lighter walls, lighter hinges and less stress on the structure in transit.
Since 1976 these homes have been built to the federal HUD Code, and door assemblies are part of what that standard covers — HUD’s own homeowner resources is the starting point if you want to read it.
How to measure before you buy
Measure the opening, not the old door, and measure it three times.
- Width of the finished opening, at the top, middle and bottom. If the numbers differ, the frame has moved — which in a manufactured home usually means the home needs releveling, and a new door will bind again within a year.
- Height of the opening, from the finished floor to the underside of the head jamb.
- Jamb depth — the thickness of the wall including the finished surfaces on both sides. If you are thinking of moving the wall rather than the door, read which walls in a mobile home carry load first. This is the number that decides whether you buy a mobile home door or a site-built one.
- Hinge side. Stand in the opening facing the way the door swings away from you. Hinges on your left is a left-hand door.
- Existing hinge positions, measured from the top of the opening. Prehung units come with their own; slabs do not.
Write all five down before you shop.
Slab or prehung?
Buy a slab if the existing jamb is square, solid and the right depth. You are replacing the door only, transferring hinges and hardware. Cheapest and fastest.
Buy prehung if the jamb is damaged, out of square, or the wrong depth — or if the opening has moved because the home is out of level. A prehung unit lets you shim the frame square inside an opening that isn’t.
In a manufactured home, prehung is more often the right call than people expect, because openings do move.
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Where to buy them
This is the part that frustrates people, so here it is plainly.
- General home centers: will have 1¾-inch site-built doors in 28, 30 and 32 inch widths. Usually not what you need, though a 30-inch site-built slab can sometimes be made to work in a deep-enough jamb.
- Manufactured housing parts suppliers: stock 1⅜-inch slabs in mobile home widths as standard inventory, online and by phone. This is the normal route.
- Mobile home dealers: some sell parts over the counter. Worth a call if there’s one nearby, since it saves shipping on an awkward item.
- Salvage and reuse: homes being demolished or renovated. Cheap, and the sizes are right by definition.
Shipping a door is expensive because of the size, so it is worth ordering everything you need — doors, casing, hardware — in one go.
If the door sticks, don’t start with the door
A sticking or dragging interior door in a manufactured home is usually a symptom, not the problem. When a home settles out of level, the frame racks, and the first thing anybody notices is that a door no longer closes.
Check before you spend money on a replacement:
- Does more than one door stick? Two or more is a strong sign of a leveling problem.
- Are there new cracks at the corners of door and window openings?
- Does the gap between door and jamb taper — wide at the top, tight at the bottom, or the other way?
If any of those apply, a new door will bind the same way. Level the home first.
Common questions
Can I use a regular interior door in a mobile home?
Only if the jamb depth accepts a 1¾-inch slab and the width and height match. Usually it doesn’t. Measure the jamb depth before you decide.
Are mobile home interior door sizes different between single-wides and double-wides?
Not systematically. Double-wides tend toward the wider end of the range, but there is no rule. Measure.
What about pocket doors?
Common in manufactured homes for bathrooms and closets because they save the swing space. Replacement hardware is available, but the track is often a proprietary part — photograph it before ordering.
Can I cut a door down to fit?
A little off the bottom, yes, on a solid or hollow-core door with a solid bottom rail. Anything more than about an inch off a hollow-core door opens up the void.