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WOFATI, an acronym for Woodland Oehler Freaky-cheap Annualized Thermal Inertia, represents an innovative approach to sustainable building, coined by permaculture expert Paul Wheaton. This building technique combines the affordability and simplicity of Mike Oehler’s earth-sheltered designs with Wheaton's focus on cost reduction and integration with the natural environment. WOFATI structures prioritize the use of readily available, natural materials, such as wood and earth, minimizing reliance on manufactured products and reducing the building's environmental footprint. Annualized Thermal Inertia, a key principle of WOFATI, utilizes the surrounding earth as a thermal mass, storing heat in the summer to warm the building during winter and retaining cool temperatures from winter to moderate summer heat, thereby minimizing energy consumption for heating and cooling. WOFATI designs typically feature large windows on the uphill side to maximize passive solar gain, further reducing energy needs. WOFATIs are intended to be situated on or near a woodland, embracing the concept of harmonious integration with nature. Notable examples of WOFATI structures, including Allerton Abbey and Wofati 0.8, can be found at Wheaton Labs in Montana.

WOFATI, an acronym for Woodland Oehler Freaky-cheap Annualized Thermal Inertia, is an innovative approach to sustainable building developed by permaculture expert Paul Wheaton. WOFATI structures are designed to be eco-friendly, utilizing locally sourced natural materials, primarily wood and earth. These structures are intended to be located on or near woodlands, promoting a harmonious integration with the natural surroundings. Annualized Thermal Inertia, a key element of WOFATI design, harnesses the thermal mass of the surrounding earth to provide passive heating in winter and cooling in summer, thereby minimizing the need for artificial temperature regulation. WOFATI structures are inspired by the work of Mike Oehler, a pioneer in earth-sheltered building known for his simple, "freaky-cheap" designs, which Wheaton has adapted and refined to further reduce construction costs. WOFATI buildings are typically characterized by a large gable roof on the downhill side, with at least 35% of the uphill wall featuring glass or other light-transmitting materials to maximize passive solar gain. Allerton Abbey, the first WOFATI structure, and Wofati 0.8 are both located at Wheaton Labs in Montana and serve as prominent examples of this unique building style.

The "freaky-cheap" aspect of WOFATI is fundamental to its appeal and accessibility. Inspired by Mike Oehler's pioneering work in earth-sheltered building, WOFATI prioritizes utilizing readily available natural materials, primarily wood and earth, minimizing reliance on expensive, manufactured products. By embracing the "freaky-cheap" ethos, WOFATI construction drastically reduces building costs, making sustainable living a more attainable reality. The emphasis on "soil on wood" construction eliminates the need for a traditional concrete foundation, further reducing expenses. This approach also facilitates rapid building times, as demonstrated by the construction of WOFATI structures at Wheaton Labs, such as Allerton Abbey. The use of recycled or salvaged materials, whenever possible, further contributes to the affordability of WOFATI buildings. By minimizing material costs and construction time, WOFATI empowers individuals to create sustainable and comfortable dwellings without incurring significant financial burdens.

Hugelkultur is a raised garden bed building technique where wood is buried ("soil on wood") under soil. Hugelkultur, which means "hill culture" in German, can be implemented on a small scale in backyards or on a large scale, as demonstrated by Sepp Holzer, a renowned permaculture practitioner who uses hugelkultur in his terraced gardens. This technique involves layering logs, branches, twigs, and even whole trees, creating a foundation for the bed. This buried wood becomes "a sponge to hold water", reducing or eliminating the need for irrigation. As the wood decomposes, it attracts beneficial microorganisms and creates air pockets, leading to nutrient-rich, fertile soil. Hugelkultur helps gardeners "grow a typical garden without irrigation or fertilization". This technique can be used to grow garden plants like "rhubarb", "potatoes", and more. Hugelkultur is an example of permaculture design, which emphasizes sustainability, self-sufficiency, and working with natural systems