Make it easy for occupants to recycle waste: recycling bins near the kitchen, under-sink compost receptacles, etc.

Gray water: Water from sinks, showers or washers can be recycled for irrigation.

Durability: Spread the environmental impacts of a building over as long a period as possible.

Make sure the structure is adaptable to other uses, and choose materials and components that can be reused or recycled in the future.

Avoid potential health hazards: Follow recommended practices to minimize radon entry into the building.

Avoid ozone-depleting chemicals in mechanical equipment and insulation: CFCs have been phased out, but their primary replacements-HCFCs-also damage the ozone layer and should be avoided where possible.

Use durable products and materials: Because manufacturing is very energy-intensive, a product that lasts longer or requires less maintenance usually saves energy. Durable products also contribute less to our solid waste problems.

Choose low-maintenance building materials: Where possible, select building materials that will require little maintenance (painting, retreatment, waterproofing, etc.) or whose maintenance will have minimal environmental impact.

Choose building materials with low embodied energy: Heavily processed or manufactured products and materials are usually more energy-intensive.

Buy locally produced building materials: Transportation is costly in both energy use and pollution generation.

Use building products made from recycled materials: Recycled materials reduce solid waste problems, cut energy consumption in manufacturing and save on natural resource use. A few examples of materials with recycled content are cellulose insulation, Homasote™, Thermo-ply™ exterior sheathing, floor tile made from ground glass, and recycled plastic lumber.

Use salvaged building materials: Reduce landfill pressure and save natural resources by using salvaged materials like lumber, millwork, certain plumbing fixtures and hardware.

Seek responsibly harvested wood supplies: Use lumber from independently certified, well-managed forests. Avoid lumber products produced from old-growth timber unless they are certified. Don't buy tropical hardwoods.