Bespoke Composting Toilets - Free Range Designs

Free Range Loos

Here at Free Range Designs we've been researching and developing the optimum design of compost toilet for a number of years and have now come up with a range of compost toilets for sale designed to be simple to use and easy to maintain. These include bespoke and ready-made composting toilets to suit all budgets and locations, from the most simple and affordable Portable Composting Box, to the beautiful high-spec Timber Arc Toilet.

The common feature of all our toilets is urine separation, which is the key factor for successful odour-free composting. For collecting the solids, our designs include a range of solutions, from the basic bucket to the common wheelie bin, and recycled plastic twin chambers.


Urine Separator - Free Range Designs

Urine Separation  

Keeping urine separate is usually the key to a successful composting toilet. Our toilets all come with a wee separator, which is used to divert the urine away from the solids into a separate container or soak away. This keeps the solid waste odour free and optimises the composting process. For the process to work aerobically, moisture levels need to be controlled: too dry, and the mass decomposes slowly or not at all; too wet and anaerobic organisms thrive, creating undesirable smells.

We developed the urine separator ourselves when we weren’t able to find a suitable product anywhere else. It is designed to fit standard piping and attachments and is made from recycled plastic. It slides in under the toilet seat platform and is easily removed for cleaning.

As urine is high in nitrogen, potassium and phosphorus, it can be used as a fertiliser (on nonfood plants) when mixed about 1:10 in water. Soak-aways divert the urine in a pipe, which can be run underground to feed fast growing trees like ash or willow.

Here is a video that I client posted on youtube detailing why urine diversion is important.


A soak is a source of carbon, like sawdust, straw, hay, shredded paper or earth. Addition of the right amount of soak is important for good decomposition because bacteria like to eat a balanced diet of carbon and nitrogen. Human waste contains a lot of nitrogen so a good amount of carboniferous material is needed to avoid the bacteria giving off excess nitrogen in the form of ammonia, which is what is smelly. So you just need to keep a bucket of soak next to the loo and drop a handful into the toilet after each use.


Wheelie Bin Compost Toilet - Free Range DesignsThe Wheelie Bin System  

Many of our ready-made composting toilets feature the ubiquitous wheelie bin – an innovative and hassle free system for composting human manure. Using a wheelie bin may at first sound strange, but if we were to hire a team of designers to come up with the perfect receptacle to hold humanure then after two years and a huge budget they would come back with the wheelie bin! 

Wheelie bins are easy to move, watertight, rodent proof and cheap, which makes storage and emptying a doddle.

Once you have filled your first bin then you replace it with a second bin. When this is full, you empty the first bin (which should have started to compost nicely by now) into a standard garden 1m x 1m compost box that allows the air to circulate and aerobic composting to happen more rapidly. Here the final stage of the compost process happens for up to a year. Each subsequent bin is added on top. The waste is reduced from 100% solids to 6% in one - two years. 

The advantage of the wheelie bin system is that you can rotate the bins as quickly as they fill up. More people means more bins. On average, using the composting toilet everyday, it takes one adult 150 days to fill up a bin. So a group of six people would fill a bin in about 25 days, and a group of 15 people would fill a bin in about two weeks. If the toilet is used only occasionally, it will take much longer to fill the bin.


Twin-Chamber-Compost-Toilets - Free Range DesignsTwin Chamber Toilets

This system uses a large rectangular box made from recycled plastic that is divided into two compartments: one for current use and one for resting and composting. There is a urine diverter inside that pipes the liquid into an external 25 litre container or soak away, depending on your situation.

There are two large hatches at the back of the box to empty from, and a vent pipe. Each chamber has a larger capacity than the wheelie bin, which has the advantage of needing to empty it less often, although it is not as easy to empty as the bin. However, by the time you come to empty a full chamber, the solids should have turned into odourless compost and not be unpleasant to handle.



 Free Range Loo Buildings

We have designed a range of compost toilets for sale to suit most occasions, from the compact Bog Standard to the spacious Disabled Access and posh Timber Arc toilets.

Here they are according to size: 

Portable-Compost-Box - Free Range Designs


Portable Composting Toilet Box. 

This is the most simple - and cheapest - of all our compost toilets. Light and portable, this toilet consists of a simple wooden box that houses a bucket and a urine separator.




Bucket-Bog - Free Range Designs

Bucket Bog

This is the most basic version of our Bog Standard composting toilet, using the age-old bucket system for collecting humanure, and is great for use in your garden or on your allotment.





Bog-Standard-Toilet - Free Range DesignsBog Standard Toilet

The idea of this compost loo is that it can be self-assembled anywhere. It is compact and easy to install and comes with everything you need to get started, delivered direct to you. The Bog Standard is a no-frills compost toilet, that has been designed to be as simple to use, affordable and effective as possible.





Gypsy-Compost-Toilet - Free Range DesignsGypsy Compost Toilet

The Gypsy Caravan is the next size up from the Bog Standard composting toilet, providing more space inside and taking design inspiration from the traditional bowtop Gypsy caravan, to create a compost toilet with outdoor charm. 





Timber-Arc-Toilet - Free Range Designs


Timber Arc Toilet

This attractive, half ellipse design compost toile is built to a very high standard, with a long service life, and is particularly suited to situations where a slick, modern design toilet is desired for ongoing use by the public. 





Disabled-Access-Compost-Toilet - Free Range DesignsDisabled Access Compost Toilet

Based on the Gypsy Caravan Compost Toilet design, this disabled access composting toilet has all the charm of the original model, but has been redesigned to comfortably accommodate somebody in a wheelchair, plus a carer.





Twin-Compost-Toilet - Free Range DesignsTwin Compost Toilet

This double composting toilet unit clones our popular Bog Standard Compost Toilet side by side into one building.





To order one of our toilets, or for further information, call us now: tel 07759 439658.



Bespoke Composting Toilets - Free Range Designs 

We Love Bespoke !

All our composting toilet designs have been driven by requests from clients. Can you build a small, lightweight compost toilet that can be carried by two people? Can you design a compost toilet that meets disbled access regulations? Can you build a compost toilet with wheels?

We love building bespoke compost toilets - it gives us a chance to break the mould again and redesign the toilet. Some of the ideas we would like to pursue are :

Composting Toilets for Hire : We are waiting for an opportunity to design compost toilet blocks to be used at festivals and large scale events. We all know how terrible toilets can be at festivals and would love to change this by designing compost toilets that can be easily assembled and disassembled and moved from one festival to another. Let us know if you would be interested in hiring our compost toilets.

Tree Bogs : Tree bogs are the ultimate composting toilet solutions. Any of our designs can be modified to be tree bogs. We are looking for a client who would like this solution implemented on their site. Let us know if it might be you.

Compost Toilet and Shower Cubicle : There has been a lot of interest in a dual compost toilet and shower cubicle suitable for camp sites. So far, we have not actually had a commission for one, but we are waiting for the right client to come along and give us the go ahead. Could this be what you are looking for?


Get in touch with your bespoke ideas, we'd love to hear from you: tel 07759 439658.


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