Nanke Signature Group is one of Arizona’s most distinguished design-build firms, and one of the longest standing home builders in Prescott, AZ. Nanke Signature Group is one of Arizona’s most distinguished design-build firms, and one of the longest standing home builders in Prescott, AZ. Prescott’s most acclaimed architectural & construction firm, for 70 years. Energy Star certified builder who adds value to your custom home through the industry’s latest techniques and innovations, meeting the Passive Home Standard.