We are looking to do an extension next year when our mortgage is up for review. We had a really rough sketch done - two storey extension at the back, and a room built over the garage - it comes out at 49.57m sq. Does anyone know what this might cost to build and fill? I'm budgeting around �100k but am really (REALLY!) hoping it will come in less than this. We live in Oxfordshire.
Also, could anyone advise on what you need to do regarding planning permission (is it needed) and who did you get to do your drawings?