Hi, I want to build a 2 storey rear extension on permitted development the house is detached and the extension is to be 3m wide. We have 12.4m to the rear boundary but only 1m between the house and the side boundaries. I want to know if I can build the ground floor extension only leaving 1m either side as the eaves here will be less than 3m and the first floor staggered in at the sides leaving the 2m gap required where the eaves are higher than 3m or do I have to bring the ground floor level inline with the first floor therefore loosing a meter on each side of the ground floor as well?

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