Garden buildings are exempt from building regulations as long as:

1 - They do not contain any sleeping accommodation 

2 - They have a floor area of 15m2 or less.

OR

They have a floor area between 15m2 and 30m2, and they are sited 1m or more from the boundary.

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Our friendly team are knowledgeable regarding building regulations. They will be delighted to discuss this with you during the design process. You can find detailed information regarding exemptions from building regulations here - https://www.labc.co.uk/news/does-my-new-outbuilding-need-building-regulations-approval.