Ok I know there are so many variables - we have a house with a single garage in the footprint of the house. Looking to convert to a snug for the kids. Would need to knock through to create a door to the hallway, raise floor, redo ceiling to hide all the pipes, possible redirect some of the pipe work, dig down foundations to put a low wall in at the front, large window at the front (with tiling at the front underneath), insulate, box in the boiler and plaster. Everything apart from painting (which we will do ourselves -one thing I can do!). The quote is 22k. I can’t get hold of another builder at the moment. Does that sound fair? We are in the south east.