Games/Gym room in garden

Hi Ray, A few things to consider with your ‘outbuilding’. These are considered to be permitted development subject to the limits set out on the below link. https://www.planningportal.co.uk/info/200130/common_projects/43/outbuildings Particular points to consider are whether your property is within a National Park, The Boards, Area of Outstanding Natural Beauty or World Heritage Site, these do not allow for an outbuilding to be more than 20m form the house and greater than 10m2. If it is subject to an Article 4 Direction or other restriction this will limit permitted development rights. As far as your areas and height are concerned and provided that the proposal does not conflict with any other restrictions, your proposed height is within the expectable limits but area (8x4m) will need to be assessed against the overall area of he house. Under permitted development rights the outbuilding cannot be more than half the areas of the original house (the house as it was built or stood on 1 July 1948). I hope this helps

Good afternoon Ray, I agree with the answers given by jnf architecture. Another couple of points to add maybe; The permitted development rights are for within the curtilage of the original property. Under normal circumstances, this can be considered as within the legal boundaries of ownership. However, 300ft from the house, may actually considered as outside of the curtilage of the house rather curiously. Where the curtilage starts and ends is not easy to determine and is typically a legal rather than architectural matter, but you may possibly get some advice from your local planning department. One other thing to consider is that a building of greater than thirty square metres is subject to the Building Regulations and should be inspected by an approved building control body. Sorry to possibly have added further confusion, but curtilage can be a contentious issue with planning departments.

The answer from jnf is almost spot on, but for the final point; it is half the original curtilage, not the house itself. The building must be within that curtilage. If there is any doubt as to what the curtilage is, then you can submit an application for a certificate of lawful development on the proposed development

I’d check with the council first. Permitted development rights are not 100% guaranteed.