There are no predefined options and designs when it comes to building a custom home. The requirements and the design always keep changing. There is a lot of flexibility when it comes to building a custom home.
The land where the custom home is going to be built would belong to you completely. You will not be sharing the land with other homeowners just like how it would happen in case of production homes or row houses. The whole land itself will be customized to suit the construction of your home.
The floor plans for the home can be designed from scratch without any dependence. You can hire a designer and a custom home builder who are dedicated to your project. You have to make sure that the designs that you choose are not too mainstream. Just like this, you have to sharpen your decision making abilities. Of course, if you hire a competent custom home builder, your job would be a lot easier. But still, you will have to be a lot more involved in the whole process of the construction of the home.