Portable Toilets for Motorhomes and Campervans — What Works Best

Motorhome and campervan owners face a specific set of constraints when choosing a portable toilet: limited floor space, the need for stable positioning during travel, and a desire for something that feels closer to home than a basic bucket. The good news is that in 2026, there are more well-designed options than ever. Here is what works best for life on the road, just in time for summer touring season.

Cassette Toilets — The Built-In Solution

Most factory-built motorhomes come equipped with a Thetford cassette toilet. The unit is permanently mounted over a waste cassette that slides out through an external service hatch. This means you never carry waste through the living area. Thetford's C-series cassettes are found in the majority of UK and European motorhomes, and replacement parts are readily available.

If your vehicle did not come with a cassette toilet — common in smaller campervans and self-builds — aftermarket cassette systems from Thetford and Dometic can be retrofitted. Installation requires cutting an external hatch and securing the toilet frame, but the result is a clean, permanent setup.

Cassette Toilet Advantages for Motorhomes

• External emptying — no carrying waste through the vehicle
• Higher seat position — closer to domestic comfort
• Larger capacity cassettes available (up to 19 litres)
• Stable during travel when bolted in place

Portable Chemical Toilets — Flexible and Affordable

Not every campervan has the space or structural allowance for a cassette installation. In these cases, a standalone portable chemical toilet is the practical answer. The Thetford Porta Potti 365 is the most popular choice for van lifers, offering a 21-litre waste tank and piston flush in a footprint that tucks into a rear cupboard or under a bench seat.

Dometic portables offer similar specs with a slightly different design language, and Blue Diamond models provide a budget-friendly entry point for those fitting out a van on a tight budget.

Secure the toilet during travel using a non-slip mat or a simple strap system to prevent it sliding around corners. Some van builders create a dedicated recessed compartment — this is the neatest approach.

Composting Toilets — The Off-Grid Favourite

Van lifers who spend extended periods off-grid increasingly choose composting toilets. These units need no water and no chemicals — just a carbon medium and a 12V ventilation fan. They are bulkier than a Porta Potti but eliminate the need to find chemical disposal points, which can be a genuine challenge on remote touring routes in Scotland, Wales and rural England.

Installation requires routing a vent hose through the vehicle wall or floor and connecting the fan to your 12V system. Once set up, a composting toilet is low-maintenance and virtually odour-free.

Key Considerations for Vehicle Toilets

1. Space: measure your available footprint before buying. Cassette units need wall-mounting space plus external hatch clearance.
2. Weight: a full 21-litre waste tank adds significant weight. Consider this for payload-sensitive campervans.
3. Ventilation: any toilet benefits from airflow. A roof vent or window in the washroom area helps enormously.
4. Access to facilities: if you mainly use serviced campsites, a chemical toilet is simplest. If you wild-camp, composting wins.

Accessories That Make a Difference

A dedicated toilet compartment screen or shower and toilet tent for external use transforms a portable toilet from an emergency backup into a comfortable daily facility. Pair it with quality chemicals, a non-slip mat and a small waste bag dispenser for hygiene.

Moving into summer 2026, the choice for motorhome and campervan owners has never been better. Explore portable and cassette toilet options at UK Camping and Leisure to find the right match for your vehicle and travel style.