Underfloor heating works in conservatories, extensions, garden rooms and loft conversions. What changes from one to the next is how hard the system has to work, and that comes down almost entirely to how the room is built. That's the idea this guide is built around. Rather than treating "adding a room" as one job, it looks at each type of space in turn: how it holds heat, what that means for an electric underfloor heating system, and what to sort out before any work starts. W