Currently doing my plans and I have put a double garage at the back of my house (with 2 street access) I believe I have to set back 3m which is not a real issue I take it this is from my boundary. I want an idea on what dimensions I should build, I havent done any costings yet, first a slab then go from there. What would I need to do if i were to build the sides out of brick for the slab? Also can someone advise on the roller door, is there standard sizes I should consider I am possibly looking for one with a greater drop ( so i can park the caravan in it.) Or am I better off going for a steel pre fab one? So the first question is height, I look like building a 6x6m one. I have become a fan of trusses is there any degree of pitch I should go for?