Hi everyone :D
Had a builder round and explained my plans/ideas based on info gained from this thread.
I was going to have 6 piers, 4 on the window/door side. The area on the window/door side is about 10sqm, so about 600 bricks at 1/2 brick. The piers take 2.1m x 14 = 30 bricks each, i.e...