Place the cabinet after the door's swing is known, not before. Mark the arc the shower door takes and the arc the cabinet door takes, and put the cabinet where the two do not meet in normal use - which usually means at the far end of the wall, or on the side the shower door does not open towards.
The conflict is easy to miss because both elements are measured on the same wall. A cabinet is chosen by its width, a shower door by its opening, and neither of those numbers says anything about whether the two can be used at the same time.
The starting point is the cabinet's own working space rather than its dimensions. A mirrored cabinet needs room to open; a recessed one needs a wall cavity; both need a position where a person can stand in front of them while the shower is dry.
Four positions are worth mapping before anything is ordered.
Two of those are physical and two are habits, and the habits are what catch people out: a bathroom that works on a plan can still fail if the shower is always used before the mirror is. The mirror and cabinet size guide covers how cabinet sizes are chosen against a wall, and the door swing and entry width guide covers the swing side of the same question.
Clearance between the two arcs is not one number; it depends on how each door is hinged and which way each one opens.
| Situation | What the clearance has to allow for | Where the conflict appears |
|---|---|---|
| Cabinet door opens towards the shower | The two arcs, plus the person's hand at the cabinet handle | At the cabinet's opening edge |
| Shower door opens towards the cabinet | The shower door's full travel, including the person stepping out | Along the shower door's leading edge |
| Both open away from each other | Only the standing space in front of each | Usually no conflict at all |
| One is a sliding door | Wall length for the panel to travel, not floor space | Where the panel parks |
Cabinets with two doors change the picture, because each leaf has its own arc and the pair together sweeps more of the wall than a single door. The same applies to a shower door with a fixed panel: the panel removes part of the arc, and the remaining swing is easier to place.
When the two arcs do conflict, one of them has to move, and the choice is made on reversibility rather than on preference.
The order reflects what can be undone. A cabinet that is moved can be moved again; a shower door that is changed cannot be changed back without another order, and the wall is not reversible at all. The recessed cabinet guide covers the constraint that matters most when the cabinet is the element being repositioned, and the cabinet door clearance guide covers the space the cabinet needs for itself.
Three confirmations prevent the layout being decided twice - once on paper and once on site.
Before ordering, verify: the position of the shower door's arc, marked on the floor; the cabinet's own arc and hinge side; the standing space in front of the cabinet; the wall type behind both fixings, since a mirror cabinet and a shower door load the wall differently; and whether the cabinet is recessed or surface mounted, because that decides whether the wall is opened before it is tiled. The cabinet size guide covers the wall-side measurements, and the swing planning guide covers the rest of the room.
Map both swings on the floor before either element is chosen: the arc that cannot be moved decides the layout, and everything on that wall is then placed around it rather than adjusted afterwards.