A portable FRP toilet cabin is one of the hardest-working units on any site. It is used dozens of times a day, often by workers who have no other facility. Well looked after, it stays clean, odour-free and in service for years. Neglected, it becomes the site's biggest complaint within weeks. This guide gives a simple maintenance routine for single-seater cabins and multi-seater toilet blocks.
Why FRP toilet cabins are easy to maintain
The walls, floor and ceiling are moulded FRP with a smooth gelcoat finish that doesn't absorb odours or stains, and the floor is moulded with a slope towards the drain. A deep water-seal P-trap and a tall rooftop vent pipe keep smells down. Most of the routine below is about keeping those features working.
Daily
- Clean all surfaces (pan, floor, walls, door and washbasin) with water and a mild detergent or toilet cleaner, using a soft brush or cloth.
- Wash the floor towards the drain. The moulded slope carries water away.
- Refill consumables: water, soap, and any mug or jet spray.
- Check that the door latch and the vacant/occupied indicator work.
Weekly
- Check the water supply: taps, flush valve and jet spray, and look for leaks in the CPVC/UPVC pipes and brass fittings.
- Make sure the P-trap holds water. A dry trap is the most common cause of smell. Flush any cubicle that hasn't been used.
- Clear the ventilation louvres and check the exhaust fan is running.
- Check the light and electrical connection, especially after heavy rain.
Monthly
- Inspect the overhead water tank. Single cabins usually carry a 200 or 300 L tank and multi-seater blocks 500–1,500 L. Clean the tank periodically and keep its lid closed.
- Check the waste outlet (a standard 110 mm PVC connection) and the pipe to the septic tank, sewer or soak pit for leaks or blockages.
- Check that the cabin is still level. Ground settles on sites, and a cabin that tilts drains badly and strains its door.
Self-contained cabins with a holding tank
On sites with no sewer, construction site toilet cabins can have a 300–500 L waste holding tank under the floor, emptied by a vacuum suction tanker through a camlock pump-out valve.
- Schedule pump-outs before the tank is full. Work out the interval from the number of users, and check the level in the first weeks.
- Keep tanker access clear to the pump-out valve.
- Use only approved, licensed operators for emptying and disposal.
What not to do
- Avoid abrasive scrubbers, wire brushes and harsh acid or solvent cleaners. They dull and damage the gelcoat surface, making it harder to keep clean.
- Don't throw rags, plastic or sanitary waste into the pan. Provide a covered bin.
- Don't block the roof vent or stack materials against the louvres.
- Don't drill new holes in walls or the roof without sealing them.
When you move the cabin
Empty the waste tank and drain the water tank before lifting. Disconnect water, waste and power. Lift only by the skid base or the crane lifting points. At the new location, set the cabin on firm, level ground before reconnecting.
Planning the right number of cabins
Overused cabins are the hardest to keep clean. Size the facility from your peak headcount. See our site toilet cabin planning guide and construction site toilet setup guide. Indicative prices for single cubicles and multi-seater blocks are on the toilet cabin specs and price page. See the full security and toilet cabins range.
