Knocking down wallls & bricking up door?

I have a utility room built into the interior of my kitchen. Don't believe the walls are load bearing, though they are brick I think not stud, but I'm thinking of getting them knocked down to make more space in the kitchen. Also have an exterior door within the utiilty room which we're thinking of maybe bricking up, but adding a vent for a tumble dryer. Each wall to be removed is about 1m across, and one of them has a small radiator and light switch which would need to be removed / moved. How long should this take and roughly how much