Design Solution: The design focuses on improving light and connection across the two-story house. An open staircase at the center organizes the plan, linking the main living spaces while allowing each room to maintain some independence. Positioned above the existing kitchen, the stair draws on the materials of the original house, and a sloped ceiling with skylights brings daylight deep into the shared areas.

U-channel glazing lines the exterior walls of the upper level. The use of translucent glass brings in consistent daylight while maintaining privacy, with operable windows placed strategically for views and cross ventilation. Set at a height of just under 8 feet, the glazing creates a sense of openness despite the compact footprint and simplifies the design of doors, joinery, and service zones.

The project emphasizes cost control and efficient use of materials. The exterior and interior are finished with relatively inexpensive, durable materials such as corrugated metal (mini-orb), bendable plywood, and wood wool panels. By building on the existing structure, the design minimizes demolition and structural changes. Only one new column was added to support the upper level, and the roof garden is carefully set between existing rafters to reduce impact.

Photo © Ben Hosking

Structure and Materials: The project prioritizes durable, low-impact materials and ease of reuse. Exterior cladding is fixed for simple replacement or recycling. Interior finishes emphasize renewable, low-VOC materials, including cork flooring and sustainably sourced hardwood plywood. Wood wool panels—made from wood fibers, cement, and recycled stone—are used at the stair for durability and acoustic performance. Plasterboard is used sparingly in favor of lower–embodied-energy alternatives such as plywood and hardwood veneer.

Additional Information
Completion date: November 2024
Site size: .4 acres
Total construction cost: $469,300
Client/Owner: Withheld

Photos © Ben Hosking

Drawings courtesy OFFICE MI-JI, click to enlarge