Bathroom door rotting at the bottom? Your replacement options compared

Quick answer: timber and plywood doors rot at the bottom because the bottom edge is bare, unsealed wood sitting inches from a wet floor — it drinks water up the end grain like a bundle of straws. Sanding and repainting the face does nothing, because the water never came in through the face. The honest fix is a PVC or aluminium door, roughly RM 180–800 installed depending on type, plus one check most people skip: the door frame, which often rots along with the door.

Why the bottom always goes first

Factory doors arrive with the faces sealed or painted, but the bottom edge gets trimmed to size on site — and almost nobody seals the fresh cut. In the wet-floor bathrooms typical of terrace houses around Serdang, Seri Kembangan and Bangi, that raw edge gets splashed every shower and every mop. The veneer starts peeling, the bottom rail swells, and after a few years you can push a finger through it. It is cosmetic right up until the hinge screws lose their grip and the door starts dropping.

Check the frame before you buy a door

Press a screwdriver into the bottom 10 cm of the timber frame on both sides. If the tip sinks in easily, the frame is rotten too — and a new door hung on a rotten frame starts sagging within a year because the hinge screws have nothing solid to bite. The clean solution is an aluminium wrap-around frame fitted over or in place of the old one, usually done in the same visit. Budget roughly RM 150–300 extra for it.

Your options compared

Option	Rough installed price	Lifespan	Worth knowing
PVC door	RM 180–350	5–8 years	Cheapest and fully rot-proof, but hollow and light — feels flimsy, colours fade, and panels go brittle with age. Fine for rentals and back bathrooms.
Aluminium swing door	RM 450–800	15+ years	Solid feel, holds a towel hook, best long-term value. The usual pick for a master bathroom.
Aluminium bifold	RM 380–650	10–15 years	Folds into half the swing space — a lifesaver for the narrow bathrooms common in older terrace layouts. Bottom track needs regular cleaning or it jams.

Whichever you choose, keep ventilation: a louvre panel or vent slots in the new door does the quiet daily work of drying the bathroom out. A fully sealed door in an unventilated bathroom trades a rotten door for mouldy walls.

Two cheap extras that protect the next door

A threshold strip. If shower water runs right up to the doorway, a simple 3–5 cm threshold keeps the bottom of the new door out of standing water — the difference between a door that lasts 5 years and one that lasts 15.
Fresh silicone at the frame base. Sealing where frame meets tile stops water wicking in behind, where you cannot see it happening.

If water regularly pools at the doorway no matter what, that is a floor-slope problem, not a door problem — worth diagnosing before spending on a nice door.

A half-day job people postpone for years

A rotting door is one of those things you stop seeing after a while, but it holds moisture and mould against the wall, and it will eventually fail on its hinges — usually at the least convenient moment. Swapping it is a half-day handyman job, and it pairs naturally with regrouting or resealing work in the same visit. If the bathroom behind the door is equally tired, the door is often best rolled into a proper refresh — see our price guide for what that costs.