Permaculture principles focus on developing sustainable architecture and regenerative habitat. Wikipedia cites principles set forth by David Holmgren in "Permaculture: Principles and Pathways Beyond Sustainability" that include observing and interacting, catching and storing energy, obtaining a yield, and applying self-regulation and accepting feedback. Permaculture is a subtype of ecological and environmental design.
Holmgren's principles of permaculture also include using and valuing renewable resources, producing little to no waste, designing from patterns found in nature, integrating, using small and slow solutions, using and valuing diversity, using edges and valuing the marginal, and creatively using and responding to change.
Permaculture is a type of ecological design that is based around ethics and design principles. Permaculture tries to mimic patterns and relationships found in nature so that the human race can become responsible producers. One example of permaculture is Hügelkultur, which is the practice of burying large amounts of wood in the ground to increase water retention in the soil. The wood soaks and holds enough water to keep crops growing in the dry season without having to use expensive sprinkler or watering systems. According to PermaculturePrinciples.com, though the practice and method may vary depending on the location and available resources, permaculture is intended to help humanity prepare for an unsure future with less available resources, such as energy.