Structural Calculations for a Building Regularions - Single Storey Garden Extension

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Experience Level: Intermediate
Design details: Hi,

I have an existing Single storey garden extension which is 3 meters in depth and constructed 30 years ago. It has a flat roof which is 2.5 m high and solid single brick walls.

I would like to extend it further 3 meters as now permitted developments are allowed up to 6 meters. We are ok with neighbours consultation, and looking to start the work. However, need help for the building regulation calculations and drawings.

New extension will be exactly the same another 3 meters, and flat roof same height so no fancy difficult job. We need to do remove the garden facing wall of the existing extension, and joists from existing one should be linked to the new one. So, i might also need some other calculations foundations, bricks etc although there are mostly fine. In addition, I would like to have one small windows at the side of the existing extension, and another at the side of the new extension so might need calculations for lintel.

Ideas for the visual style: Single Storey Extension
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