The ideal slope for in-ground building is a slope of 5 to 7 feet through the width of the house, or 15% to 20%. A more measurable benefit of building into a slope is often reduced heating and cooling expenses -and added comfort- that result from the temperature of the soil five feet below grade (the “outside air temperature” of these spaces) is a constant 52 degrees year-round. And if properly designed, the in-ground living area can be bright and spacious.Įnvironmentally responsible site design begins with minimizing disturbance to any site, and working with the existing topography is an essential ingredient. Building into a gentle slope can enhance the efficiency of a design by providing living space inside the foundation and requiring less additional material and labor than the same amount of space above grade.
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