I'm looking at purchasing a subdivided property (street-facing) where there is a single-car carport at the rear (it's on the land's title at the rear border). There's cement on the ground and a pergola-looking structure as the carport. I'd like to turn this into a garage (ideally brick) with an automated door, and also include a side-door which will lead straight into the property's backyard. I have absolutely no idea how much this would cost to do. Has anyone got any ball-park figures or experience in this area? Anything else I should take into consideration?