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WOFATI structures are characterized by a thoughtful design that prioritizes passive systems and natural, locally sourced materials. The "two-skin" system, composed of a double layer of polyethylene membrane, encapsulates the earthen roof, providing a durable and waterproof barrier. The lower layer hugs the structure, while the upper layer defines the thermal mass surrounding it, with at least eight inches of dirt between the layers and sixteen inches on top. WOFATI designs emphasize a harmonious integration with the surrounding woodland, incorporating the "soil on wood" building technique. This method eliminates the need for a conventional concrete foundation, making construction faster and more affordable. A distinctive feature of WOFATI houses is the large gable roof on the downhill side, often incorporating glazing to allow light penetration, while at least 35% of the uphill wall features windows for optimal passive solar gain. This strategic placement and sizing of windows is crucial for maximizing natural light and regulating internal temperature, contributing to the effectiveness of Annualized Thermal Inertia.

The willow feeder system, a "freaky-cheap" and sustainable approach to human waste management, was developed by permaculture expert Paul Wheaton as an alternative to conventional septic systems and sewage treatment plants. The system emphasizes a closed-loop cycle, transforming human waste, or "poop", into valuable fertilizer, termed "willow candy". Unlike composting toilets, willow feeders utilize a dry environment created within sealed garbage cans to mummify the waste, preventing composting and the potential spread of pathogens. A small amount of sawdust is added to each can, primarily for aesthetic purposes. This dry process also preserves valuable carbon and nitrogen, which are often lost to the atmosphere during hot composting. After two years of aging, the pathogen-free "willow candy" can be safely applied as fertilizer to "poop beasts" — trees like willow, cottonwood, poplar, and bamboo — which can handle the high nutrient content without being harmed. This system turns human waste into a valuable resource, promoting sustainable gardening practices.

WOFATI, an acronym coined by Paul Wheaton, stands for Woodland Oehler Freaky-cheap Annualized Thermal Inertia. It defines a type of earth-sheltered, passive building that blends affordability with energy efficiency. Inspired by the work of Mike Oehler, a pioneer of earth-sheltered building, WOFATI designs use locally sourced, natural materials, such as wood and earth, to minimize both cost and environmental impact. Central to the WOFATI concept is Annualized Thermal Inertia, which utilizes the surrounding earth as a thermal mass to moderate temperatures year-round. This means that the building stays warm in the winter by storing heat from the summer, and cool in the summer by retaining the coolness of the winter, greatly reducing the need for artificial heating and cooling. WOFATI structures typically have a large gable roof on the downhill side, and at least 35% of the uphill wall is made of glass or other light-transmitting material to maximize passive solar gain. WOFATI buildings are ideally situated on or near a woodland, emphasizing a harmonious integration with nature. Allerton Abbey, the first WOFATI, along with Wofati 0.8, are examples of this building style and can be found at Wheaton Labs.