Introduction
A bathroom is a small room with a high concentration of technical work. Water, drainage, plumbing, electrical services, waterproofing, ventilation, tiles and fixtures all have to fit into a limited area.
For that reason, the best bathroom renovations are planned from the hidden layers outward. The visible finishes matter, but they should follow a technically sound layout and substrate.
Start with the existing condition
Before fixing the new design, inspect:
- signs of moisture or failed waterproofing;
- drainage locations;
- plumbing condition;
- floor levels and falls;
- wall/substrate condition;
- ventilation;
- electrical locations;
- door/window positions.
A bathroom that looks dated may still have sound hidden systems; another may require deeper work than the finishes suggest.
Decide whether the layout should change
Moving the shower, toilet, basin or bath can improve the room, but it can also affect plumbing, drainage, falls and floor/wall construction.
A layout should balance:
- comfortable circulation;
- door swing/access;
- storage;
- wet/dry zones;
- cleaning/maintenance;
- available wall space;
- natural or mechanical ventilation.
Waterproofing is a system, not a product
Waterproofing depends on preparation, corners, penetrations, junctions and drainage details as well as the membrane/product itself.
Plan waterproofing around:
- shower/wet areas;
- floor-to-wall junctions;
- pipe penetrations;
- thresholds;
- niches;
- drains;
- any balcony/external interface where relevant.
Do not install final tiles before the substrate and waterproofing sequence is properly resolved.
Plumbing and drainage
Before walls and floors are closed, confirm:
- hot/cold water routes;
- waste/drain connections;
- fixture positions;
- access for maintenance where appropriate;
- compatibility with selected fixtures.
Late fixture changes can force service changes after waterproofing or tiling has begun.
Electrical and lighting
Bathrooms need safe and appropriately planned electrical work. Final requirements must follow current applicable regulations and qualified-professional requirements.
Coordinate:
- general lighting;
- mirror/task lighting;
- extraction/ventilation;
- heated mirrors or specialist fixtures where used;
- switches/outlets in compliant locations.
Tile and finish decisions
Tile size, pattern and material influence:
- set-out;
- cuts around fixtures;
- falls to drains;
- grout joints;
- maintenance;
- substrate preparation.
Choose finishes in relation to the room geometry rather than only from a sample board.
Fixtures and storage
Resolve sizes early for:
- vanity;
- basin;
- toilet;
- shower screen;
- bath where used;
- taps/mixers;
- niches/shelves;
- towel storage.
Cabinetry and sanitaryware dimensions can affect plumbing and tiling set-out.
Recommended sequence
- existing-condition assessment;
- layout/fixture decisions;
- strip-out;
- plumbing/electrical first fix;
- substrate preparation;
- waterproofing;
- tiling/finishes;
- cabinetry/fixtures;
- final connections;
- sealants, testing and snagging.
FAQ
Should I move the toilet or shower during renovation?
Only if the improved layout justifies the service changes. Confirm drainage/plumbing implications before finalising the design.
Why is waterproofing so important?
Bathrooms repeatedly expose surfaces and junctions to water. Failures behind tiles can damage finishes and adjacent construction.
Should fixtures be chosen before tiling?
Major fixture dimensions and positions should be known early enough to coordinate services, waterproofing and tile set-out.