Not too sure how small they make them, or how much they cost, but we had one of these where I served my apprenticeship – it was used as a temporary storage area…. it’s still sat in the corner of the site, 30 years later!

http://www.rubb.co.uk/products.html

Dean.

You beat me to it, Dean. I’ve also used Rubb Buildings in a warehousing application and they are very durable and weather resistant, and you shouldn’t have any trouble selling on when you’ve finished. I believe they can also be leased – although this could turn out to be an expensive option it would enable you to aquire the most suitable size for different stages of the project.