I would appreciate any views on a possible roadblock that my house extension plan seems to have hit. Someone may know whether there is a solution to this that is feasible at reasonable cost, or may have designed a solution to it in the past. Here's hoping. I have architect's drawing for a 2 storey extension to my bungalow that will convert it from a simple bungalow with a couple of rooms up in the converted attic space (completed many years ago) into an L shaped house. The upstairs, which was done more than 30 years ago, uses the current 6 x 2 roof beams (ceiling joists for the ground floor) as a floor - it would probably not pass if it was put to planning and building control today, as they might demand something thicker - 8 x 2 maybe. The way the roof is going to be changed is quite extensive and would require many of the existing roof structure to be cut away and replaced with new timber. Here is the problem: if I have to raise the existing floor upstairs, then the staircase needs replaced and I dont have space to put a new staircase in that would be legal in today's requirements, so I want to keep the upstairs floor at its current height on 6 x 2 beams at all costs. Is there a way to create a new roof, while using 6 inch beams, but somehow strengthen it (tensile stress presumably) enough to pass the building regs? I can probably manage the load bearing side of it by doubling up the number of ceiling joists, but a structural engineer I was getting a quote from has suggested that the existing beams in the ceiling would not be strong enough to stop the roof from stretching outwards. If there is not an easy solution, I dont want to go any further in terms of paying professional fees for a project that is probably unfeasible. Anyone been here before?