Have an inexpensive dual-pocket presentation folder. On one side, compile a few current letters of recommendation. On the other, insert your proposal, information about your company, professional installation information, etc. If your prospect is shopping, all information is kept in your folder. Your folder reflects the quality of your workmanship and service.
Clients willingly pay a premium for the feeling of security consistency gives.
Remember, do what the competition does not do. Small-time contractors view sales materials as a waste of time and money. Being cheap, there are no resources for creating a better impression. However, when given the choice, most clients want the best. The site visit should include all the decision-makers.