ESTIMATES:
Estimates are given to fix a defined problem noticed or perceived by the customer. A leak usually causes this call.
There is a charge for the initial visit, usually $25.00.
Inspections are a different mater.
INSPECTIONS:
Inspections are entirely different from estimates. They are often a legal instrument for realtors, bankers, etc. in regards salability of a house. Sometimes, they're a legal instrument in a court against shoddy workmanship.
If I'm signing one, I'll spend an hour or 2 on a residence detailing everything I can come up with, good and bad. Then a hour writing/editing it. That doesn't include up to 2 hours road time. sometimes.
My minimum is $265.00