The old version of this page treated shower lip height like a fixed product choice. In a real bathroom refit, the better question is: what finished threshold gives safe access, good drainage and reliable water containment in this specific room?
Shower tray lip height comparison
| Shower base type | Typical appeal | What to check before choosing |
|---|---|---|
| Raised tray or plinth | Easier waste route where the existing floor cannot be altered much | Step-in height, trip risk, panel access, stability and whether the plinth looks acceptable. |
| Low-profile tray | Cleaner look and lower step for daily use | Finished floor level, tray bedding, waste depth, pipe fall and whether the floor can take the installation method. |
| Level-access or wet-room style | Best access when designed correctly | Floor former, falls, tanking, drainage capacity, screen position, joist direction and future maintenance access. |
| Accessible shower conversion | Safer entry and easier help from a carer if needed | Door route, turning space, grab-rail fixing zones, seat location, slip resistance and controls within reach. |
Shower threshold planning checker
Use this before buying a tray, screen or wet-room kit.
Why finished height is different from tray height
The installed height includes adhesive, bedding, support frame or plinth, not just the tray shell.
Tiles, backer boards, vinyl, underlay and any levelling work change the real step into the shower.
A low tray still needs a trap and pipe fall. If the waste cannot run, the floor or tray height may need changing.
Low thresholds need careful tanking, seal transitions and screen design so water does not escape into the room.
Common mistakes with low shower lips
- Ordering a low tray before checking the waste depth under the floor.
- Forgetting that a screenless walk-in shower needs enough fall and splash distance.
- Assuming a wet-room look is cheaper than a tray: floor preparation can cost more.
- Leaving grab-rail and seat fixing zones until after the walls are boarded.
- Choosing a tiny lip to look modern, then fighting leaks and poor drainage later.
If you are replacing a raised tray, planning a walk-in shower or converting a bathroom for easier access, ABC Home can check the floor build-up, waste route and waterproofing as part of a bathroom fitting project in Aberdeen.
Sources and practical checks used
- Scottish Government technical handbook 2022: sanitary facilities: notes that dwellings should include a bath or shower and discusses accessible sanitary accommodation.
- Scottish Government technical handbook 2022: ventilation: gives bathroom or shower room extraction guidance, relevant when changing a shower room layout.
- GOV.UK Approved Document M: accessibility reference for dwellings and buildings in England; useful background when access is the driver.
FAQ
What is a shower base lip?
It is the raised edge or threshold that helps contain water at the shower tray or base. People also call it a shower curb, tray edge or step-in height.
What shower tray lip height is best?
There is no single best height. A low-profile or level-access solution is better for access, but it needs the right floor build-up, waste route, waterproofing and screen design.
Can I replace a raised shower tray with a low-profile tray?
Often yes, but only after checking waste depth, pipe fall, floor structure and finished floor levels. The advertised tray height is not the whole finished step.
Does a lower lip always stop leaks?
No. Splash control depends on tray fall, screen position, door seal, shower pressure, user habits and waterproofing. A low threshold with poor falls can leak badly.
