We had drain tile installed from a company suggested by Angie's List. The basement is dry, but there are a few things we can caution you about. First, use an established company. If the company goes out of business, the warranty is worthless. The one we used is out of business now. They attached a hose outside for the water to drain from the sump pump. This seems to be a standard procedure. There was quite a bit of water coming out. My neighbor reported it to the city. After a city inspector came out, I was told that this is not allowed in the city, only the suburbs of Chicago. He said to contact someone who is licensed by the city to correct the situation ASAP. Many of the companies who provide basement waterproofing are not licensed by the city or as plumbers. It is good to check on this before you hire them to do the job. Now, we are paying a sewer company 2600.00 to direct the water into the Chicago Sewer System from two sump pumps, which is what the city code demands.
Also, it is a good idea to get a back up pump. If electricity goes off during a storm, the pump will continue to work. Another thing that was discovered is that in order to get a clean cut in the concrete floor they have to use a "diamond cutter". I couldn't find anyone that uses one in Chicago. If the cut is not clean, cracks in the cement floor can be a problem which can lead to other difficulties such a radon seepage from under the foundation. We did get some cracks, which they tried to seal but there doesn't seem to be much choice as no one offers a clean cut, at least not in the Chicago area. Once the cracks appear, you can't really seal it and what was once a smooth concrete floor does not look as good with cracks in it.