Thanks everyone. Our architect is finalising our building regs buts needs SE and the one he usually uses now mainly deals with commercial builds so are charging a crazy price. So he has approached another SE but we have waited 3 weeks so far for a quote to see what their price will be (still haven’t got one) I’m just concerned if we still haven’t even got a quote after 3 weeks how long will it take to do the calculations? We are just getting 5x4 rear extension with vaulted apex ceiling with glass gable. I thought it was a simple design but apparently not. Am I right in thinking it’s a bit chicken and egg scenario as we needs the drawings to get quotes from builders and then if they come in over budget we may then change to timber? So presume will need to go back to SE if we change to timber?