In the middle right now of doing same type of thing, we are building room to back 14ft x9ft, and making dining room /kitchen into one big open plan kitchen, RSJ needed , we are builing a hipped roof for new room which is ready for tiler, lean to roof we thought did not look as nice but just an opinion every one to themselves, we got quote for job of 36,000/34,000 Euro by a 2 diifferent builders, So we decided to do a self build. My brother is a plumber and nephew a Sparks so that is taking care of, got a carpenter friend of brother to do timber for roof, and a cost of 600E and also put in 2 velux, person who is doing the blocks and knocking down of 2 walls ie one to new room and other between kitchen/dining and who will do slabing and put in windows in new room and also one in new kitchen, who will leave it ready for painting cost 8500.00 he is also friend of family, one builder said lean to roof is cheaper to do and a hipped would cost an extra 2000.00 euro and made build deal of it, but our carpenter took one look and said hipp roof no problem , By the end material will cost between 4000.-4500 labour chippy needs to hang doors so total for him will be around 800E, builder 8500.00, roofer still waiting for price but is friend of brother so not sure , plumber and sparks Free family do not charge , so think about doing it yourself, we did foundation ourselves, a mini digger will fit up your side lane or get 5 lads with shovels like we did, any Questions just ask, I pay workmen and after that they do what they like, so around 14000.00 will be total