Don't try and separate it to the point you set up a separate website etc for it - bad move
You'll end up having separate domains with same business and contact info and duplicate content - a really bad move for SEO
Add it on your existing business and website as a separate service and do jobs as they come in and you feel comfortable
Go for AdWords then if you need to with your hard floor page as the landing page
Its dinosaur ethics from a modern business world where you need to get high on Google for service driven industries, locally targeted, to say keep it all separate, that's really bad information. And once its done, it can take a long time to build trust and SEO rankings again with Google for either one of the two businesses then
In the days of paper printed ad's like Yellow Pages etc you could get away with it, but things have moved on drastically since then and time to keep up or lose out