Build vs Buy - Construction Products Retailer

Hi

I am considering purchasing a retailer of residential construction products (e.g. windows, doors, garage doors, etc.). I am trying to determine whether I should buy a business or just start one on my own. Considering that 80-90% of their business is end users walking into the showroom and only 10-20% contractors I am not buying recurring revenue. I can put a number on setting up a showroom but is there a lot of value in being setup as a dealer for manufacturers? What about the existing employees?

Has anyone gone through a build vs buy thought exercise in this industry?

Eric