No idea, give him a ring for a chat (number on website). We had a long lead in time (our choice) to sort monies etc.. He has some really good ideas and can vouch for his workers who are all excellent. Quality of work is top notch (in our experience).
We used Mat Miles from Miles Better Builds. Excellent and happy to recommend (no links). You may have a wait though!
https://www.milesbetterbuilds.co.uk/