Always be careful about who you refer to your clients...Mike this is where having a good network plays a strong role in getting more business also. I'm doing a tile&grout repair tomorrow. When I booked the job she and her husband asked if I knew a good stucco guy. So not only were they confident in me but also those that I refer to them for other services.
It's a win win, I'm able to help out someone with more work, I'm able to help a homeowner with a need and build trust and confidence.