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Paved seating area

We currently have a retainer wall that holds roughly a 25m by 5 metre area of lawn. I would like to put a paved seating are down one end of this lawn (assuming an area of 5x7m) so that we are able to put a lounging area up there. Please see pics for idea (wooden decking area only) and location on our property. I'm aware this will need to be viewed and discussed further before estimates given.