The Phillips Collection


Washington, DC
21,780 SF; $7 Million
Client: Bowie Gridley Architects
Owner: Phillips Family
Role: Cost Estimating 

Hanscomb Consulting provided cost estimating services during design for the addition of a rooftop penthouse on the main building (a Georgian Revival house dating to 1890), to resolve existing mechanical issues and to better protect the building and art below by enclosing all new MEP systems. In addition, the fourth floor will be entirely reconfigured and the design adopts the same height as the existing rooftop skylight, which was added in the 1930’s, to create a studio space.  The new roof is laid back from the face of the building to further differentiate itself from the existing skylight. The exterior treatment proposed is copper shingles matching the adjacent skylight which is large-scale flat copper panels.