Bathroom Interior Design: Waterproofing, Slopes and Fittings That Last

A bathroom is the only room in the house where a mistake becomes someone else's ceiling. It is also the room where the expensive-looking parts — tiles, fittings, mirrors — matter far less than the invisible ones.

Waterproofing is the whole job

Waterproofing should go on the floor and run up the walls: about 30 cm generally, and full height in the shower zone. It must be done before tiling, tested by ponding water for 24–48 hours, and the test should be witnessed. A leak found after tiling costs the entire bathroom to fix; a leak found during ponding costs a day.

Slope and drainage

The floor needs a fall of roughly 1 cm per metre towards the drain. Too little and water pools; too much and the floor feels wrong underfoot. Check the slope with a bucket of water before the fittings go in — the drain should clear it without a puddle anywhere.

Dry and wet separation

A glass partition or even a shower curtain plus a small kerb keeps the WC and vanity area usable and dry. This is the single change that most improves an ordinary Indian bathroom. Where space is tight, a fixed glass panel of 60–90 cm without a door gives most of the benefit without the swing space.

Ventilation

An exhaust fan sized to the room and vented outside, not into a false ceiling void. Damp trapped above the ceiling is how mould starts in the room next door. If there is a window, the fan still earns its place during monsoon.

Storage that Indian bathrooms usually lack

A vanity with drawers rather than a pedestal basin, a mirror cabinet for daily items, a recessed shower niche built during tiling rather than a suction caddy that falls, and a spot for a bucket and mug that is not the middle of the floor. Niches must be planned before tiling — they cannot be added later.

Tiles and safety

Use an anti-skid floor tile — a glossy floor tile in a wet room is genuinely dangerous, and it is a common cost-saving swap. Larger wall tiles mean fewer grout lines and less cleaning. Epoxy grout costs more and stays clean far longer than cement grout, especially in a shower.

Fittings

Concealed cisterns and diverters look clean but need an accessible service panel — insist on one. For taps and showers, brand and cartridge quality matter more than shape; a dripping designer tap is still a dripping tap, and spares for unbranded fittings are impossible to source in year four.