The short answer is yes but there are some building warrant guidelines you need to follow.

The long and more detailed answer is:

Whether or not you can put a toilet in your garden room depends on various factors such as local building codes, zoning regulations, size and the specific purpose of the garden room. Some councils are more lenient an others not so much!

If the garden room is intended for residential use, then you will likely need to comply with local building codes and regulations that govern plumbing, electrical, and sanitation systems. These codes may require certain specifications for the toilet and its installation, such as the type of plumbing, ventilation, and drainage required.

If the garden room is intended for commercial use or as a workspace, then additional regulations may apply, such as requirements for accessibility, occupancy, and the type of business or activity being conducted.

It is always best to check with your local building department to determine what regulations apply to your specific situation before installing a toilet in your garden room. They will be able to provide you with information on the permits and approvals required and any specific requirements you need to follow.

Don’t forget you will always need to call the local council if your building is going to be over 30m sq and less than 1m away from the boundary.