Energy efficiency. The builder carefully seals all the ducts, installs appropriate insulation and calculates the correct HVAC equipment needs. The home features energy-efficient appliances and fixtures.

Water efficiency. Low-flow toilets, aerated faucets and efficient washing machines inside, drought-tolerant landscaping outside.

Resource efficiency. Recycled building materials, thoughtful waste-management techniques and durable construction are all signs of builders limiting the use of precious resources.

Lot and site development. The home is protected from prevailing winds and takes advantage of the sun's light and energy. The lot's natural features are preserved.

Indoor environmental quality is enhanced by good air circulation throughout the home, minimizing or sealing off moisture and potential pollutants from the house and using low- or no-VOC paints and sealants.

Home owner education is a key part of the green building process. The correct operation and maintenance of a new home is essential to keeping it green, and a home owner's manual is required of all certified homes.