Hello all, Im DIY self building a side extension and installing a window on the front and french doors on the back both 1200mm. However Im a little confused as the brick course width with joint of 5.5 bricks is 1248 and 5 is 1135. A standard wickes window and french doors is 1190 assuming ill need 10mm each side, neither work?? So anyone have any ideas how this fits nicely? Am I missing something? https://www.wickes.co.uk/Wickes-Upv...ors-Inwards-Opening---1190-x-2090-mm/p/187557 The height however (2090 including sill pack) fits within 28 brick courses (2110) with 10mm gap.