The Committee is responsible for the restoration and regular maintenance of almost 300 original historic clocks, which are still located throughout the Capitol and associated buildings of the Capitol complex.

The clock project began in 1993 with the objective to restore and maintain the clocks' wood finishes and inner mechanisms. In addition, the Committee wanted to collect and maintain historic documentation along with an inventory of each clock. By developing an electronic database, detailed information was compiled, including clock descriptions, construction materials, dimensions, conditions, location, and an ongoing maintenance history.

Following restoration, each clock is put on a cyclical maintenance program. The Committee's clock conservator oils the inner mechanisms of each clock every three years. After five years, the clocks are given a thorough check-up and cleaned inside and out. While the majority of Capitol clocks have now been restored, ongoing preservation maintenance remains essential to ensuring they continue operating for many more years.