Are they reputable? This may seem like a rude question to ask a plumber trustworthy drain leak repair but it is important because you are going to be letting them into your home. Ask them for references and many of them will be happy to provide some. Most plumbers understand that you have to be careful who you let into your home these days and will do everything they can to ensure you that they are indeed reputable and can be trusted in your home.
If you ask and don't receive a copy of worker's compensation and liability insurance, don't use the builder. You may even go as far as to call the agent listed to verify that their insurance is in force. Finally, remember worker's compensation protects people. Liability protects property. You need to have both.
If the owner of the business isn't 100 percent involved in the business, it doesn't mean that you write them off but you should find out how the business is being managed. Quality usually has a direct correlation to the level of local water heater repair service involvement by the owner of the business.
If you are ever faced with a situation where faulty plumbing is causing water leaks, there is only one sensible course of action. That is obviously to turn off the water supply altogether, and wait for a qualified operative to come and assess the situation. This is why it is important to always know where the stop cock is located on your property. Don't leave it until it is too late to find out. Make sure that you know how to turn off the electricity supply as well, as flooding can make electricity extremely dangerous. If you think there is risk, leave the situation to a trained professional.
Last but not least is don't hire someone just because they gave you the lowest bid. Next don't hire some handyman that does odd drain leak jobs, in some cases they can cause you more problems that down the road it will cost you more money to fix what these handyman broke or did wrong. Sometimes the lowest bid is going to cut corners and not do the job right or when they get there and start doing the work, they keep saying they are finding more and more wrong and you end up spending more than what you should have.
So now you have a solid house. By that I mean, plumbing, electrical, heating and air-conditioning, roof, foundation and overall good structural integrity.
A reputable plumbing service will often make suggestions when you initially contact them. In the case of a clogged drain, for example, they have seen hundreds or even thousands of cases just like yours and they know that most bathroom sink clogs are the result of by hair building up in the drain. Accumulated hair can create a plugged drain and it can be a fairly straightforward job to loosen up the clog and have a free flowing drain again.