I recall. You could probably pick a shed up free if you keep an eye on your local Gumtree and Freecycle.
Anyway, in answer to the question ours definitely is not, though in London the basement corridor is usually full of bikes, currently being renovated so they are in storage. We have a floor dedicated to 'projects', which is also my wife's workshop. Bikes living in their at the moment.
Up here I had some indoors at the last house, but every last bike, motorbike parts, 4x4 parts, etc. now live in my new workshop. until I have time to start fitting it out and then they will all get built up, put back on the vehicles they belong to which will then reside in various locations. The bikes we ride live out in the car port, and there is space enough there to do maintenance.
Speaking of leaking roofs, I have to go and look at a shed that needs a new roof!
The doctor diagnosed me with hereditary diarrhoea. I can't understand, I wear a kilt.