sorry if this seems obviously wrong but with regard to permitted development and with reference to the "side" of your house, i can only see that you have one actual "side" which would be the area between the front face and the rear running down the "side" of the house. i think this west facing wall(for example)is still classed as a rear wall as it isnt actually on the "side" of your house. it is around the back. this side rule relates to extensions that protrude from the side of the house not because a wall faces a certain direction. there are drawings that explain this on the gov portal. feel free to cut me down.
The document
Permitted Development for Householders Technical Guidance August 2010 which is normally available to view/download off the Planning Portal identifies a side elevation as the following:
A wall forming a side elevation of a house will be any wall that cannot be identified as being a front wall or a rear wall.
It also states the following:
Where an extension fills the area between a side elevation and a rear wall, then the restrictions on extensions beyond rear walls and side walls will apply.
Strangely to anyone else reading this, the Technical Guidance is not available to view on the PP at the mo? I wonder if it is to be revised to adsorb the latest PD changes?