The house from the front yard: the existing gable-roofed mid-century house in vertical wood cladding sits in the foreground at left, with the new second-story addition rising behind it as a long horizontal volume clad in vertical thermally-treated wood, a continuous band of clerestory windows running along its upper edge; foreground stone wall and curving driveway, layered autumn foliage in oranges and yellows surrounding the house, dusky purple-grey sky above

Mid-Century Modern Addition

Lexington, Massachusetts

The house began as a standard plan in the neighborhood, built in 1952, and grew over time as previous owners added a garage and a studio. The current owner wishes to add a primary suite and a second bedroom on a new upper level, and an office for working from home that today happens at the dining table. The addition gives the program the room it has come to need without disturbing the parts of the house that are working.

Because the existing 1952 house has no insulation in its walls, the project is also an envelope project. The addition lets the office insulate the new wall cavity and add continuous insulation outboard of the existing sheathing where the new work meets the old, and the entire house will be re-clad in thermally treated wood that will be allowed to silver naturally over time. The addition reads quietly as a second floor lifted above the existing roofline, oriented to catch southern light along a clerestory band, with the original gable-roofed volume still legible in front of it.

Lexington's historic commission recently approved the design. More to come as the project advances.

Project Team
Architect
Five Fields Collaborative
Site isometric drawing: the existing one-story house drawn in white as a small gabled mass with its garage wing at lower left, the new upper-level addition shown in solid orange as a long horizontal rectangular volume sitting over and behind the existing house, the property lines and lot edges drawn as thin grey lines around the building
Site
Longitudinal section drawing: the existing one-story gable-roofed house and attached garage shown in elevation at left, the new addition cut through at right showing two stacked levels of new construction over an existing basement level, two figures standing in the upper-level bathroom giving scale, the new sloped roof rising from a lower edge at far right to a higher edge meeting the existing house, the ground line continuous and falling slightly to the right
Section
Upper level plan of the addition: a rectangular floor plate organized around a central core. Master Bedroom and walk-in closet at top, Master Bath and shared Bathroom in the middle, Office to the side of the central stair, second walk-in closet and Bedroom at the bottom. The existing house roof is shown to the left in outline only, set at a slight angle to the rectangular addition
Upper Level
Archive
Further work