Paul,
We do both and have done for several years, as Shaun says we took out a Furniture Clinic franchaise at the beginning of 2009, I now employ one person full time and one part time running the leather restoration business.
Franchaising is not for everyone, however I found the terms offered and the service support were good enough to warrant the investment. We are now close to having to go VAT registered after our first year trading.
We do have a bespoke unit with includes a 3.3m spray booth, compressors, kettle, microwave, radio, wifi, etc, etc

!!!!, however you don't need this, often the majority of work, a lot can be done on site.
We also do off site rug cleaning, personnally I find it a pain in the proverbial and often not worth the time and effort, though we still do it as there is a demand out there for it, we've got two in the workshop at the moment and I'm picking up an 12 x 8 Chinese style rug tomorrow for cleaning.
If you would like to discuss it more give me a call