Composting Toilets for Raised Floors
Ideal for homes, cabins, and tiny homes with space under the floor.
How Raised Floor Installations Work
If your home has space under the floor, a split-system composting toilet system is often the ideal solution.
In this setup, the toilet pedestal sits inside the bathroom, while the composting chamber is installed below the floor. Waste drops directly into the container where natural microorganisms begin the composting process. A ventilation pipe maintains airflow and keeps the bathroom odour-free.
These raised-floor composting toilet systems are popular for raised homes, cabins, and tiny houses because they provide:
- Larger compost capacity
- Less frequent emptying
- Simple gravity-fed operation
- Easy access to the composting chamber from outside the building
The best model depends mainly on available clearance under the floor and the number of people using the toilet, which we outline below.
Prefer an all-above-floor system?
Even with a raised floor, you can still install a self-contained composting toilet, where the composting chamber is built into the toilet unit.
Explore our self-contained composting toilets.
Choose Your System Based on Clearance and Usage
Below are composting toilet systems suitable for raised floor installations. The best option depends on available under-floor clearance and the number of people using the toilet.
GL 55
Capacity:
1-2 people (expandable with extra bins)
Underfloor clearance needed:
550mm minimum
GL 90
Capacity:
2-3 people (expandable with extra bins)
Underfloor clearance needed:
450mm minimum
GT 120
Capacity:
4 people (expandable with extra bins)
Underfloor clearance needed:
880-950mm minimum
GT 330
Capacity:
8 people (expandable with extra bins)
Underfloor clearance needed:
880-1140mm minimum
Need capacity for 8+ people? Explore our Commercial Toilets range for higher-capacity systems.
Frequently Asked Questions
The required clearance depends on the composting system model. Please, see guide above or check each product page for its specific requirement.
If there is not enough space under the floor for a split composting toilet system, you can install a self-contained composting toilet instead. In self-contained systems, the composting chamber is built directly into the toilet unit, so the entire installation remains above the floor.
In most installations for a raised home, the composting chamber is easily accessed from outside the building. The chamber is typically positioned near the edge of the house.
Emptying frequency depends on the system size and number of users. In most residential situations with full-time use, the composting chamber is emptied approximately every 2–4 months.
In many installations, the toilet pedestal is positioned against an external wall. This is the most common setup and simplifies installation and maintenance. However, the pedestal can also be positioned up to about 1 metre away from an external wall, in which case please, contact office for further information.
No. When installed correctly composting toilets do not smell. A vent pipe and fan maintain airflow through the system and remove moisture and odours.