Building control calculations needed for garden room

I am building a 35sqm timber-framed garden room to UK building control specifications and need the construction calculations done to give to building control. I particularly want to know if the pile foundations I have used are suitable or if I need to add more. The building weighs approximately 8,000kg. I have a Sketchup model and construction drawings showing the details of how the building is to be constructed. I have attached the construction drawings that I have done for the project.