Manufactured housing has its own measurement discipline. Wall construction is thin, openings are often slightly off nominal, and the existing surround is usually a one-piece unit that cannot be re-tiled around. The door has to be specified against what the wall can hold and what the opening actually measures, not against a standard size label.
Framing and Wall Structure in Manufactured Homes
Walls in manufactured homes are typically thinner than site-built walls, and the framing is often light. That matters for a hinged door, because a hinge transfers the panel's weight and swing into the wall; where there is no solid backing behind the surround, a hinged glass door will loosen the fixing rather than hold it.
Two approaches work. Add blocking behind the wall before the door is fitted where the surround allows access from the other side, or specify a door whose load is carried differently - a sliding door hanging from a head rail that spans the opening, or a lighter framed door that distributes load through a frame. Where neither is possible, a fixed screen with an open entry avoids the hinged load entirely.
Non-Standard Openings: Where to Measure
Measure the finished opening between the surround faces at three heights, and use the narrowest reading. Measure the height from the base or tub ledge to the underside of the opening head at both ends, and the depth from the back wall to the front edge of the base. Then check square by comparing the diagonals.
Record whether the existing surround covers the base flange or sits behind it, because that determines whether the base can stay in place while the door is replaced. Where the surround is a single moulded unit, the door is normally the only part that can be changed without disturbing the shower itself.
Lightweight Doors That Still Seal
Lightweight does not mean poorly sealed. A framed or semi-frameless sliding door with 1/4 in. or 5/16 in. glass, a track that carries the panels, and seals at the bottom and both vertical edges will keep water in as well as a heavier door, provided the seals are sized correctly and the door is adjusted so it closes against its own seal line.
What lightweight construction does change is the maintenance list: frames and tracks have more surfaces to clean, and the track collects residue. Washing the rail as part of routine cleaning, and replacing seals rather than adding sealant, keeps the assembly working.
Tub Replacement and Surround Compatibility
Where the tub is being replaced at the same time, the sequence matters. A new tub or base sets the ledge line and the opening width, so the surround and the door are measured from it. Fitting a door first and a tub second is how a mismatch appears at the seal line.
Where the existing surround is being reused, measure its actual opening rather than its nominal size, and confirm the door will cover it. Moulded surrounds in manufactured housing are often sized slightly differently from the tub that sits beneath them, and the door has to follow the surround.
Alcove Widths Common in Manufactured Housing
Alcove showers in manufactured homes commonly run narrower than a standard residential alcove, often in the 32 in. to 40 in. range for a stall, with tub showers at the usual 54 in. or 60 in. length but sometimes with a shallower depth. Measure the actual finished opening rather than assuming the nominal size, because a few inches changes whether a standard door fits at all.
Where the opening falls outside standard ranges, the options are a made-to-measure door or a fixed screen with an open entry. The footprints and door widths available in the standard range are summarised in the guide to shower door sizes and heights.
Repairing Wall Damage Before Installing
Delamination and soft spots around a shower opening are common in older manufactured homes, and a door fixed to a soft wall will not hold its adjustment. Before installing, check the substrate around the opening by pressing and by looking for staining; where it is soft, cut back and replace the affected section, and add blocking at the fixing points while the wall is open.
Where water has been getting behind the surround, the fix is a repair rather than a new door. The moisture guidance published by the EPA explains how far that has to be checked, and the wet-area methods behind the repair are published by the Tile Council of North America and catalogued on the Whole Building Design Guide. Plumbing and construction provisions come from the adopted code published at iccsafe.org.
Doors That Survive Movement in a Mobile Home
Manufactured homes move more than site-built houses, and the movement shows up at door and window openings. A door that tolerates small movement is one with adjustment built in: hinges with vertical and lateral adjustment, or a sliding door with an adjustable roller carriage and a bottom guide that keeps the panel aligned.
Doors with no adjustment range are the ones that go out of alignment and stay there. When specifying, confirm how the door can be re-set after movement, and confirm that seals, rollers and gaskets remain available for the series, because in a small bathroom a part swap is always preferable to a full replacement. Glazing used in these installations falls under 16 CFR Part 1201, and component test methods are published by ASTM International.
FAQ
What size is a mobile home shower?
Tub showers in manufactured housing are often 54 in. or 60 in. long with a shallower depth than site-built tubs, and stall showers commonly run narrower than a standard residential alcove. Because of that variation, measure the finished opening at three heights rather than ordering against a nominal size.
Do mobile homes need special doors?
They need doors specified for the wall construction and the opening: lighter framed or sliding doors where framing is thin, and made-to-measure sizes where the opening is off nominal. Where no solid backing exists, a fixed screen with an open entry avoids the hinged load entirely.
Are mobile home showers different?
The fixtures are similar, but the surrounding construction differs: thinner walls, less blocking and moulded surrounds that are often retained during a door replacement. The door has to be chosen for what the wall can carry and measured against the surround opening.
What can I use instead of a shower door?
A fixed glass screen with an open entry, or a curtain on a track, particularly where the existing surround and base are being retained and the wall cannot take a hinge. A fixed screen removes the moving hardware and the swing requirement, which suits a small, thin-walled alcove.
Send the finished opening width at three heights, the surround type and a photograph of the wall around the door, and we will confirm a door that suits the framing.
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