If you’re considering a manufactured home in Arizona, you might have heard about “pit set” installations. While traditional manufactured homes sit on full foundations or piers, elevating the home at least 29” above grade, a pit set involves placing the home partially into a dug-out area of the lot. This method can offer both advantages and challenges specific to Arizona’s climate and soil conditions.
What Is a Pit Set Home?
A pit set home is essentially a manufactured home installed with part of its structure below ground level. Unlike a standard installation on a pier or slab, the home is “pit set” so that the bottom of the home sits slightly recessed into the earth. This can help with insulation, stability, curb appeal (front elevation) and, in some cases, cost savings – but it also introduces unique considerations in Arizona.
Pit Set Homes Are Becoming More Common in Arizona
Historically, pit set homes were more common in the Southwest and West due to the dry climate and soil types. In Arizona, especially in areas like Phoenix, Tucson, and Prescott, pit set homes are increasingly used in:
- New manufactured home subdivisions – Builders are incorporating pit set designs for energy efficiency and aesthetics.
- Infill developments – a pit set can help maintain a more residential look, assimilating homes around them.
Pros of Pit Set Homes in Arizona
- Energy Efficiency – The partially underground placement provides natural insulation, keeping homes cooler in summer and warmer in winter, a big plus in Arizona’s hot desert climate.
- Wind and Weather Stability – Pit set homes have a little lower profile, which can reduce exposure to strong monsoonal winds common in Arizona.
- Cost Savings – Depending on the lot, pit setting may reduce the need for extensive foundation work, though costs vary based on soil and excavation requirements, as well HUD and state and local specifications.
Considerations
- Drainage and Flooding – Arizona’s desert washes and monsoon storms can lead to water pooling. Proper drainage is crucial to avoid water intrusion.
- Soil Conditions – Certain areas, especially around Phoenix and Tucson, have expansive clay soils that can shift, potentially affecting the home’s stability. Make sure the footers/foundation is placed according to state, local and HUD specifications.
- Access and Maintenance – Utilities, crawl spaces, and landscaping may require additional planning and maintenance due to the recessed design. Landscaping requiring water could cause pooling under the house, so therefore, insure water is directed away from your home.
Pit Set vs. Traditional Installations
| Feature | Pit Set Home | Traditional Home |
| Ground Contact | Partially below ground | Fully on pier or slab |
| Energy Efficiency | Higher in extreme climates | Standard (although you can specify your home built to higher energy standards |
| Cost | Variable, may save on foundation | Predictable, may require more foundation |
| Drainage Needs | High, must plan for monsoons, flower bed watering, etc | Standard |
| Aesthetic Integration | Low profile, blends with lot and neighboring structures | Standard elevation, usually at least 29” above grade |
Arizona-Specific Tips
- Check Local Codes: Some cities, including Phoenix and Tucson, have specific regulations for pit set homes.
- Hire Experienced Installers: Look for contractors familiar with Arizona soils and monsoon drainage.
- Consider Cooling and Ventilation: Even partially underground homes need adequate airflow to prevent heat buildup in summer.
Finally, pit set homes can be a smart choice in Arizona for energy efficiency and aesthetic appeal, especially in new subdivisions or infill lots. However, careful attention to drainage, soil conditions, and building codes is essential to ensure long-term comfort and stability.