Kudos pilsbury!! That is amazing! I'm inspired. Tbh, I don't have the same tenacity nor the commitment. Looking at a similar - wraparound build - and I have been quoted 70k+ on average from 5 builders quotes. Now, I'm in the Midlands, not London. The wraparound is - single storey, rear extension, side extension and front porch. The back/rear extension is 4m (ish) by 8m, the side is 8m x 2m(ish) and porch 4m x 1.5m (ish) given a rough total of 55m2 (ish). So that works out to be £1270/m2!!!! I'm cut from the same cloth, got a small budget. I'd do the labour but with a 5ft 4in frame I'd give it a shot