Each of the designs is passive solar oriented so that a large percentage of the heat requirement can be supplied by passive Each floor plan has a choice of roof systems depending on what is appropriate for the site and owner. South sloping low slope roofs maximize the ability to collect the rain water that lands on the roof and feed it into a centrally located cistern which could be located on the south side of building. Gable roofs offer a high slope and the ability to use metal roofing which are very long lasting, cost effective, and good for water collection. Generally they need to slope in two dirrections making it more complicated to have total rain water collection in a centralized location. Interior and exterior wall finishes are plaster typical of adobe buildings.
Every effort is made to use no products that have environmental side effects.
Wood finished surfaces are minimized to reduce the need for plywoods, sealers, and paints. Plumbing and electrical systems are designed to minimize consumption and maximize efficient use. All of the designs are offered in a basic low cost package and all can have options added that will increase the performance and efficiency of the building. These options include roof water collection system, greywater plumbing, photovoltaic electrical service, solar hot water and floor heat, permaculture landscaping, thermal window curtains, earth berming and more. Its like purchasing a vehicle.