New gas supply and fire pipework

Planning the route

I lifted sections of the floor to see exactly what I was working with before cutting anything. Notching joists badly is how you weaken a floor, so the route was set out first, through the joists in the right places and around the existing cables.

Running the new gas pipe

The new run is all copper, sized properly for the appliances it feeds so there is no pressure drop at the far end. Every length is clipped and supported, and the pipe is marked up as gas so anyone lifting that floor in future knows exactly what they are looking at.

Where it turns and drops, I bent the pipe rather than filling the run with fittings. Fewer joints means fewer places for anything to go wrong.

Outside and tested

The supply comes out through the wall to a neat external drop with an isolation valve and label, clipped straight and kept tight to the brickwork.

Everything was tightness tested and the appliances checked and signed off before I left. Floors went back down, and the only sign I had been there is a tidy pipe on the wall.