What a service call actually looks like
Most calls start with a symptom rather than a cause. A tap that drips, a toilet that runs, a stain on a ceiling, water where there should not be any. The first part of the visit is working out what is actually happening. Water travels along joists, so a wet spot in the front hall can start above the back bathroom.
We quote before we work. You get told what the repair is, what it costs, and what else we noticed. If more than one approach is reasonable you get the options, not just the one we would prefer to sell. When something has to come apart before it can be priced honestly, we say so instead of padding the number to cover the unknown.
Not every visit ends in a repair. Sometimes the fixture is fine and the noise is normal for that valve. Sometimes what you called about is a symptom of something larger that is better planned than patched.