Well since we don't have a massive amount of information from your OP I can say this...
My dad recently managed the construction of a shop for a company. The total contract value was £7m, this included fitting, planning, legal and environmental management. Thus I think we can assume yours will be in this region too.
I'm guessing this wasn't a little corner shop.

glad I only need a randomly placed server and a home pc for mine
kinda throws a proper office out the window.