Can we find cost relief for an easement that our new home builder did not disclose to us upon signing our contracts?

The details of a water easement were not disclosed to us. We were originally told that it was questionable whether not the material of our fence would be stone or not due to the easement location. 10 months later, the builder has been changing our home plan and told us nothing can go in our backyard (despite the home plans anticipating that we could). They have asked us to sign a legal document acknowledging the restrictions of the easement, but this document was court ordered a year ago, with all of the information to avoid having to make design changes during the building stage of the house. Additionally, the water district has informed us that the easement will be accessed in the future in order to upgrade the pipeline. The builder acknowledged the diminution of value of our property in the legal document, but has given us no relief because of it. The builder was offered a chance to purchase the easement, but refused. The builder even had us sign a paper showing where trees would go