I have had 6 railway layouts in lofts, without any probs. Council, either want new joists, the other way, fixed to walls , or new ones screwed/ glued to existing, wall supported.. Thats it. Aluminium loft ladder. I have never been inspected, just photographed my joists. Brighton, southampton, weymouth, kidderminster, stranraer. For occasional, hobby use, must be cheaper than shed, and all that goes with it. john