The Erection Centre!!
Everything you need to help you put it up.

Depends upon the purpose for which you want it. For example:
Aardvark Builders' Merchants - gets you listed first in Yellow Pages.
Lincoln Building Supplies - tells customers where it is and what you do.
Wickes - a brand that has built an identity over time, but probably few people knew what it was to start with.
Harry & Son Building Supplies - says that you are a family-owned company, which may be more relevant if you are supplying into small builders who will want a more personal service.