What are the concerns with building on a steep slope how are they addressed and what is the cost of addressing them? Building on steeper slopes often presents challenges, and this type of construction is carefully regulated by local jurisdictions that vary, as do local soil types.Ĭodes that restrict building exist to protect the environment and the people who share it. 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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