The shed was an old, derelict washhouse.
It was totally renovated (new roof etc) and had electricity and water services hooked up, then it was built into a fully functioning brewery
There is a blog article with loads of pictures and info about the renovation/build on the website of a man who makes fancy trousers (not me, I make beer):
https://hebtro.co/2019/05/02/shed-of-heaven-craigs-brewshed//