The planning application went in yesterday for the new extension, so that will take 8 weeks, I’ve agreed a price with a builder and he is booked for May. Build will take maybe 6 weeks.
I decided to abandon the idea of extending the existing garage in favour of building a new extension on t’other side of the house. This is after speaking with our very own Simon @sjs . He thought that despite the available plot on the other side of the house being an asymmetric shape, it would make a better listening room. This is the sketch he very kindly did for me.