Americans may turn to underground homes as experts raise major concerns

Could your next home be underground?

Imagine trading an attic for a room tucked beneath soil. It sounds unusual, but earth-sheltered homes are gaining attention as housing pressures, weather risks and energy costs reshape home design.

Underground living is not new. People have used earth-covered structures for centuries, while projects add engineered walls, drainage systems, ventilation and daylight. The question is whether families will choose them.

Earth has shaped shelter for centuries

Using earth for shelter has deep roots in North American history. Historical records describe earthlodges built by Mandan, Hidatsa and Arikara communities across the Northern Plains for generations of families.

Those homes used timber, branches, grass and thick sod for insulation and weather protection. Modern earth-sheltered houses use concrete, steel, waterproofing, windows and mechanical systems to create controlled indoor spaces.

The ground can soften temperature swings

One major appeal is steadier temperatures. Ground temperatures below the surface can vary less than outdoor air, helping ground-source heat pumps exchange heat efficiently in many different U.S. locations, too.

That does not mean an underground home needs no heating or cooling. Residents still need insulation, ventilation and moisture control, but stable surrounding temperatures can reduce demands on those systems.

Extreme weather changes the conversation

Earth covering can reduce exposure to some weather hazards. Designers can use soil, berms and strong building systems to limit direct exposure to wind, heat and flying embers during wildfires.

Flooding is an exception. Research finds underground spaces can face greater damage from floods, making drainage, waterproofing, grading and water management essential. Site conditions determine how well these protections work.

Fun fact: Some Ancestral Pueblo people built pithouses partly underground to take advantage of the earth’s natural insulation.

Water may be the toughest enemy

When a home sits against or below soil, water needs a clear path away. Groundwater moves through soil and rock, while heavy rain can raise water levels near the surface.

Builders need drainage systems, waterproof barriers and grading. A failure can cause repairs after construction. Because the ground hides problems, inspections and design matter when walls become difficult to reach.

Radon needs attention below ground

Radon comes from natural uranium in soil and rock. It can enter homes through cracks and openings, especially where buildings contact the ground or surrounding soil, including basements or crawlspaces.

Radon cannot be seen or smelled, so testing matters. Homes with levels of at least 4 picocuries per liter should be fixed. Barriers, sealing and soil suction systems reduce entry.

Ventilation and daylight take planning

Living below ground changes two basic needs: fresh air and natural light. Designers can use courtyards, light wells, windows and skylights to connect underground rooms with the surface inside homes.

Mechanical ventilation can help when natural airflow is limited. Exit routes also need careful planning. Building codes include requirements for underground spaces and exits, so local rules can influence design.

The construction bill can climb quickly

Underground homes may save energy during operation, but construction can cost more. Walls and roofs must handle soil loads, while waterproofing, drainage, ventilation and structural reinforcement add specialized work upfront.

Excavation can become harder when crews encounter rock or groundwater. Site studies and contractors can reduce surprises, but upfront costs remain. Maintenance requires attention because drains and waterproofing can fail.

What lies underground can be a surprise

Before digging, builders need to understand what lies beneath the property. Local geology, soils and groundwater conditions can vary considerably, affecting excavation, drainage and structural planning from place to place.

Buried infrastructure adds another challenge in developed areas. Water lines, power cables, gas lines and communication systems may occupy underground corridors. Utility locating and site surveys become essential before excavation.

People may still want windows

Engineering is only part of the decision. People choose homes for sunlight, outdoor views, fresh air and entrances. Underground designs can provide those features through courtyards, atriums and light wells.

Each solution uses space and changes layout. Someone seeking privacy or quieter rooms might appreciate the setting, while a buyer may dislike views. Personal preferences shape demand when technology works.

Partly buried homes may spread first

Another option is partial earth sheltering instead of buried houses. A home can sit in a hillside or have several sides protected by earth while retaining windows and usable outdoor space.

Hybrid designs also use features such as green roofs and earth berms. These can add insulation, manage stormwater or shield selected walls, while preserving outdoor space and a conventional entrance.

Little-known fact: Underground homes in Coober Pedy, Australia, are known as “dugouts” and are built into old mine workings and excavated spaces.

Local rules can shape what gets built

Building an underground home involves more than excavation. Local zoning, building, fire, drainage and access rules can determine whether a design is allowed and which specific safety features are required.

Model building codes include provisions for underground buildings, while local governments decide which rules they adopt. Buyers and builders need to check requirements because approvals can shape the final design.

Want to see how one architect’s idea helped shape California housing? Discover How an architect’s Cessna flight led to California’s most influential housing experiment.

Fully underground homes may stay niche

Underground housing has applications, but hurdles limit its reach. Suitable land, construction costs, groundwater, local codes and buyer preferences can narrow the market for fully buried homes in some regions.

Earth-sheltered features may appear more often where climate and site conditions make them practical. Courtyards, berms, green roofs and buried walls can provide benefits while preserving familiar, comfortable living spaces.

Underground challenges extend beyond housing, as Los Angeles’ aging water pipes are forcing tough choices underground.

Would you consider living in an earth-sheltered home? Share your thoughts in the comments and let us know what would make you say yes or no.

This slideshow was made with AI assistance and human editing.

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