The crucial parameter for the design of Villa Astrid was dictated by the local building code, which stipulates a 3.5-metre eaves height and a roof pitch between 14 and 27 degrees. This effectively reduces the size of the villa as seen from the street where only one storey is visible. The lower storey containing the bedrooms and storage is tucked away underground with a small atrium providing light and an opportunity to step outside. The third and much smaller storey is fitted under the sloping roof. The structure as a whole is carved into the solid rock of the hillside and the architect left a big chunk of that same rock in the living room as a reminder of nature. The technical specifications of the house list it as a concrete structure, plastered, with glass foam insulation and an exterior cladding of pre-patinated copper sheeting. Wingårdh regard it as their best house yet from a technical point of view.