Designed by renowned architect James Renwick Jr., this 1857 gatehouse is now the only remaining building of the original William Corcoran Estate. In 2017, the property was slated for demolition, but efforts by the DC Preservation League saved the historic structure. Wagner’s team reinstated the complex steep slope diamond pattern slate and copper mansard roof with new hand-clipped diamond slates, 16oz. copper hips, valleys, and apron flashings, new 20oz. flat seam copper dormer roofs, and a new fully soldered 20oz. copper built-in gutter.

Fun fact: Rachel Wagner Bradley, AIA, daughter of Chuck and Sheila Wagner, researched the property as her thesis in architectural school, info which later helped to document the historic elements. Rachel now owns and operates the local DC firm of Wagner Architects. This project was recognized with a 2023 DC Award for Excellence in Historic Preservation, presented by the DC Preservation League and the DC Office of the Deputy Mayor for Planning and Economic Development.

Owner: Basilica of the National Shrine of the Immaculate Conception
General Contractor: Rugo Stone
Architect: Anthony Segreti, AIA

Historic Harewood Lodge Slate Roof Gallery