Castle Rock, CO: A New Home Builder’s Dream Castle Rock is one of the most picturesque towns to live in the nation. With its sprawling vistas of the Rocky Mountains, round-the-year access to nature, and countless opportunities for fun and adventure, Castle Rock and all of Douglas County is a perfect place for custom home builders. The team at G.J. Gardner Castle Rock is excited about helping homeowners like yourself build your own home in the local area so that you can enjoy the highest quality of life possible. Why Build Your Own Home - Modern Design - Move-In Ready - Latest Technologies - Low Maintenance - Energy Efficient