We moved into the house with a retaining wall in the center of our yard. When we contacted the builder, they installed a french drain, but this didn't fix the problem. We learned an unpermitted drain was installed in a yard two houses down from us that is flowing into our neighbors yard. They said they would install a sump pump under our house, but when the installers arrived, they said the water was coming from the highest point of our foundation and now the lowest, so they left without installing it. There was clearly a grading problem. They said that the water is coming from the hillside behind our house and that the sump pump won't work. We now have a backyard with a retaining wall going through the center that is completely saturated and unusable. Builder is not responding.
There are multiple claims that may be available to you depending on the promises and warranties made by your builder prior to purchase. I recommend reviewing your contracts and warranties with a real estate and/or construction defect attorney.
Family Law Attorney
I agree with Katie, these are serious and costly problems to fix and you might need to sue the builder.
My name is Stephen R. Cohen and have practiced since 1974. I practice in Los Angeles and Orange County, CA. These answers do not create an attorney client relationship. My answers may offend I believe in telling the truth, I use common sense as well as the law. Other state's laws may differ.. There are a lot of really good attorneys on this site, I will do limited appearances which are preparation of court documents it is , less expensive. However generally I believe an attorney is better than none, but many will offer a free consultation and a face to face meeting generally will be better, I like my clients to write a short one page history of the fact and questions they have prior to meeting with them, so nothing is forgotten.