Any trustworthy drain leak repair flat floor is a good candidate for my scientific marble test. I'll drop my marble; if it rolls to a corner, that floor ain't level, Buckwheat. That's a simple test but I do want to know that the under-layer or sub-flooring is sound and firmly attached to all those joists, and beams and trimmers and blah, blah, blah.
This is a highly specialized job and you might not know exactly what to do. Many DIY enthusiasts end up creating a bigger problem than before when they try their hand at repairing kitchen or bathroom leaks. An experienced plumber, on the other hand, will be able to solve the problem easily. This person will also be able to identify potential problem areas and pre-empt any issues there.
It is always a good idea to do some online research. For example, if you have a clogged drain and you live in the Atlanta area you should search for "Atlanta plumbers" or "Atlanta drain local water heater repair service". This will bring up a list of Atlanta plumbers rather than plumbers from across the country.
When your drains are clogged do you go get the drain cleaner, do you look for a plunger, or do you get out the snake? Don't know which is best? Don't feel bad, most homeowners don't. That's because plumbing can be a complicated subject. For something as simple as a clogged drain just about any of those options will work to an extent. Obviously some of them will work better than others but which one really depends on the clog. For more problematic issues you might want to consider bringing in the professionals.
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 faucet replace 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.
We see on programmes like "Wanted Down Under - New Zealand", that plumbers are in great demand and have even sought to recruit from the UK because our plumbers are rated the best.