Everything may be found at: Cluster Housing. For your convenience, some of the most common questions/concerns are here:
RA approved doors and exterior colors:
2.27.07 Door and Color
RA rulings on decks:
6 – Decks
RA rulings on Fences and Windows:
8 – Fences – Windows
Again, everything may be found at: https://www.reston.org/PropertyOwnerResources/DesignReview/DesignGuidelines/ClusterHousing/tabid/377/Default.aspx.