Welcome, App Tech Retrofit Construction LLC had been servicing Colorado for over 17 years. It was first stablished in Aurora, Colorado servicing Aurora, Boulder, Evergreen, Highlands Ranch. Parker, Castle Rock, Fountain, and Colorado Springs. Today we are happy to announce that we are closer to you than ever. We have a local office in Colorado Springs. Quality and services had been updated to better serve you. Thanks for your continuous support and trust.