Like most other people here, I too had the misfortune of being forced to use Neighborhood Plumber due to my home warranty. My service man was Gary and he was very standoffish at first, thinking that I only had minor repairs - garbage disposal service, switching hot and cold faucets and a leaky tub faucet. For the record, he contacted America Home Shield while he was repairing my tub and said it took 30 minutes to reset the garbage disposal (2 minutes) and another 30 minutes to switch the hot and cold faucets (5 minutes) - I would never trust them to do my work again. Then Gary got real "chummy" when he saw an opportunity to make additional money.
We called Mr. Rooter because we had a leak from our kitchen sink and they responded quickly to my surprise. Mike Farnsworth shows up and gets right to work and doesn't give us an estimate for the work before he started. He ended up replacing a broken pipe in our basement that took 15 minutes and he plunged our tub and sink as well. He wasn't even here for an hour and he charged us $650 dollars! We refused to pay that much because it wasn't reasonable, so he took us to court and he ended up lying in front of a magistrate claiming he worked for 2 hours and did all these repairs, even though after he had left the sink was still leaking and the drains did not work at all!
Sometimes a faucet leak can be stopped by replacing the rubber washer at the end of a faucet stem or cartridge. This is a more common repair on older fixtures when things were built to last and designed to be able to be maintained. Other times the whole stem or cartridge needs replacement or the bibb seat deeper back into the fixture needs replacement. That leads to matching up the right components and often times making a trip to the hardware store or plumbing supply house necessary due to the many varieties, makes and models of faucets. My advice is to make sure your Plumber has faucet repair kit on their truck before having them come out to assess the issue.