Official painted portrait of 11th Architect of the Capitol Stephen T. Ayers.
Under Mr. Ayers' leadership, the Architect of the Capitol oversaw the...
The U.S. Capitol dome model in Exhibition Hall of the U.S. Capitol Visitor Center.
The U.S. Capitol Visitor Center's Exhibition Hall will close beginning March 5...

Cannon Renewal Project Overview

The Cannon House Office Building, the oldest Congressional office building outside of the Capitol Building, is in need of a complete renewal. The century-old building is plagued with serious safety, health, environmental and operational issues that are rapidly worsening. Without action, the essential systems housed behind the walls and in mechanical rooms will continue to crumble and fail, impacting members, staff and constituents.

Need for Renewal

The Cannon Building has not received a comprehensive systems upgrade since the 1930s, and many of the building's systems are original – dating back to 1908 or earlier. The systems are past the end of their useful lives and the increasing risk of their failure jeopardizes the building's long-term functionality and safety. Other necessary work includes upgrading infrastructure systems and repairing the exterior stone façade.

The Renewal Process

The Cannon Renewal Project will provide an effective workplace for the next century to serve the needs of the U.S. House of Representatives and support Congressional operations.

The renewal process is scheduled to take approximately 10 years, with each of the five phases (0-4) aligned to fall between Congressional move cycles. Phases 1-4 of the project will require that affected wings of the building be vacated. Members and their staffs will remain in the upper campus, while some Committee and support staff will relocate to the Ford House Office Building or the O'Neill House Office Building.

Phase 0 began after the 2014 election and had a low impact on building occupants. This phase included installing building utilities, primarily in the basement and the moat area of the courtyard. This enables future work to connect to the new systems, minimizing shutdowns and disturbances.

Click to enlarge the image above.

Phases 1-4 impact a quarter of the building, one side at a time, starting with the west wing in 2017 (New Jersey Avenue) followed by the north wing, east wing and concluding with the south wing. Members in the Cannon Building's Phase 1 construction zone were relocated in December 2016 prior to the start of Phase 1 construction. Construction work occurs around the clock, with activities ongoing throughout the day and night. The noisiest work takes place during the night and early morning.

Constructing a New Fifth Floor

Rendering of completed fifth floor.

When the Cannon Building was first occupied in 1908, there were a total of 397 offices – one for each representative – and 14 committee rooms. By 1913, the House had outgrown the office space in the building. An additional 51 rooms were added to the original structure by raising the roof and constructing a fifth floor, which was originally designated as storage space.

As part of the Cannon Renewal Project, a completely new fifth floor will be constructed during each successive phase. Member offices will flank both sides of the corridor, as they do on the lower floors. Work includes demolishing the walls and roof, then rebuilding an entirely new fifth floor.

Cannon Renewal Updates

Resources for House Staff
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