Re: Replace window with patio doors
We had this done (french doors), it didn't cost too much for a plumber to get the rad moved (can't be specific, it was one of a number of jobs). We have old suspended wood floors, so it wasn't as difficult as it could have been.
We had the window fitter knock out the back wall and fit the new doors. They also did some plastering to fix up around the window, but that could use some tidying up. We were charged something around 7k for all the windows (uPVC double glazed), doors (french doors, front door with side panels) and fitting, including knock out for the patio doors and a smaller part at the front door. We're in a fairly standard 3 bed semi.
I love the doors. We have no problems with the temperature and I love the sunlight the let in in the morning. Before we had them put in we had to go through the utility room to get to the back garden, which wasn't great when we had friends over.