Ecology Building Society is a building society in the United Kingdom. It was established in 1981, is based in West Yorkshire, and has over 10,000 open accounts. The Ecology is a member of the Building Societies Association. The purpose of the Society is to achieve the greatest degree of environmental sustainability. It lends money to create and maintain sustainable housing stock, preferably with sustainable communities and green enterprise. Its funding is secured with the least degree of environmental degradation possible, and with the greatest degree of stakeholder endorsement obtainable.