Hi MK. There is no all encompasing answer. Chatsworth prides itself in a rural feeling and is very pro horse. If the property you plan to build on is horse property, the local planning commission will want you to keep it as such with all the pertinent regulations. The biggest costs are related to utilities and approval by the city of your designs. Water meter installations can cost over $20,000 and require hot tapping into the middle of some streets. Sewer connection can be an issue unless you can go septic as some of the more rural areas of Chatsworth are. Other issues in building are environmental concerns for drainage and structural regarding foundations. You may have to install a fire hydrant if there isn't one close enough as well as fire sprinkler systems for the home. These all depend on the location of the property. Make sure you work with a seasoned architect farmiliar with the cities requirements and the communities desires. Chatsworth is a great place to live, best of luck.