The new extension's brickwork will be gauged with that of the existing.
But what do you do when the brick coursework varies by 33mm from front to back . I've double checked this with a laser level. All I can imagine is the house wasn't built exactly level.
If I gauge the brickwork at the the front and build perfectly level by the time I get to the back I'll be more or less 1/2 a brick out.
Is this a problem builders come across especially on older buildings or where there has been subsidence.
What do the pros do?