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Frequent Questions

What is "green building"?

Green building - also known as sustainable or high performance building - is the practice of:

  1. Increasing the efficiency with which buildings and their sites use and harvest energy, water, and materials; and
  2. Protecting and restoring human health and the environment, throughout the building life-cycle: siting, design, construction, operation, maintenance, renovation and deconstruction.

Additional information is available on the Basic Information Web page.

What makes a building "green"?

A green building is a structure that is environmentally responsible and resource-efficient throughout its life-cycle. These objectives expand and complement the classical building design concerns of economy, utility, durability, and comfort.

Green buildings are designed to reduce the overall impact of the built environment on human health and the natural environment by:

For example, green buildings may incorporate sustainable materials in their construction (e.g., reused, recycled-content, or made from renewable resources); create healthy indoor environments with minimal pollutants (e.g., reduced product emissions); and/or feature landscaping that reduces water usage (e.g., by using native plants that survive without extra watering).

What are the benefits of green building?

Buildings have an enormous impact on the environment, human health, and the economy. The successful adoption of green building strategies can maximize both the economic and environmental performance of buildings. Specific environmental, economic and social benefits are listed in Why Build Green?

Research continues to identify and clarify all of these benefits and costs of green building, and of how to achieve the greatest benefits at the lowest costs.

How is green building related to smart growth and sustainable development?

Smart growth is development that serves the economy, the community, and the environment by supporting healthy communities while creating economic development and jobs. Sustainability, or sustainable development, is the ability to achieve continuing economic prosperity while protecting the natural systems of the planet and providing a high quality of life for its people.

Green building fits nicely with these concepts, as it promotes building practices that conserve energy and water resources, preserve open spaces through brownfield development, and are accessible to public transportation. EPA has more information on smart growth and sustainability.

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How do buildings affect natural resources?

Buildings and development have significant environmental impacts on our natural resources, including:

More information is available in Buildings and the Environment: A Statistical Survey (PDF) (5 pp, 66K, About PDF), a summary of data developed by the EPA in 2004.

How do buildings affect climate change?

The energy used to heat and power our buildings leads to the consumption of large amounts of energy, mainly from burning fossil fuels - oil, natural gas and coal - which generate significant amounts of carbon dioxide (CO2), the most widespread greenhouse gas. Buildings in the U.S. contribute 38.1 percent of the nation's total carbon dioxide emissions.

Reducing the energy use and greenhouse gas emissions produced by buildings is therefore fundamental to the effort to slow the pace of global climate change. Buildings may be associated with the release of greenhouse gases in other ways, for example, construction and demolition debris that degrades in landfills may generate methane, and the extraction and manufacturing of building materials may also generate greenhouse gas emissions. More information is available on EPA's Climate Change Website.

What is the history of green building in the U.S.?

In the U.S., the green building field began to come together formally in the 1990s. A list of milestones in the U.S. is available on the Basic Information Web page.

What building types can be green?

Any type of building has the potential to become a green or sustainable building, however every building type has different design and efficiency needs depending on its particular function. New buildings may be designed, built and operated to be green buildings. Existing building can also become green through remodeling, retrofitting and improved operations. The EPA offers helpful tools for improving the environmental performance of new and existing:

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Where can I see an example of a green building in my area?

Green buildings are being constructed all over the globe. You can search for green buildings in your area in the U.S. Department of Energy's High Performance Buildings Database.

Two of the most commonly used green building rating systems in the United States are the U.S. Green Building Council's Leadership in Energy and Environmental Design (LEED) and the and the Green Building Initiative's (GBI) Green Globes. USGBC maintains a database of LEED-registered or certified building projects Exit Disclaimer. GBI provides case studies of Green Globe rated projects Exit Disclaimer.

How can I incorporate green building concepts into my home?

EPA provides a list of programs that can help you incorporate green building concepts into your home.

The Public-Private Partnership for Advancing Housing Technology also maintains a list of regional Green Building Certification Programs for housing Exit Disclaimer.

Is there federal or state legislation related to green buildings?

On the federal level, the Energy Policy Act of 2005 and the Energy Independence and Security Act of 2007 included energy efficiency and sustainable design requirements for Federal and other buildings. Additionally, there have been a series of Executive Orders and agency-specific rules promoting green building since the early 1990s and the federal government has instituted sustainable practices at many of its buildings. The Federal Commitment to Green Building: Experiences and Expectations (PDF) (89 pp, 2.1 MB, About PDF), a report of the Office of the Federal Environmental Executive, provides a history of these rules and the greening of federal facilities.

The Library of Congress THOMAS Web site has the most current information about federal legislation. Search Bill Text for "green building" to find relevant legislation.

Many state and local governments also have green building laws, mainly applying to public buildings, though an increasing number are applicable to private buildings as well. Two third-party organizations maintain lists of green building legislation:

What is Life-cycle Assessment?

Life-cycle assessment (LCA) is the science of measuring the environmental effects of a building "from cradle to grave," from the harvesting and extraction of the materials used to make the building to its ultimate disposal. There are a number of tools to assist with LCA, including those listed at:

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What are the economic benefits of green or sustainable building and development?

Well-designed, constructed, operated and maintained green buildings can have many benefits, including durability; reduced costs for energy, water, operations and maintenance; improved occupant health and productivity; and the potential for greater occupant satisfaction than standard developments.

A green building may cost more up front, but can save money over the life of the building through lower operating costs. These savings may be more apparent through life-cycle assessment (LCA).

Cost savings are most likely to be fully realized when incorporated at the project's conceptual design phase with the assistance of an integrated team of building professionals. The integrated systems approach aims to design the building as one system rather than a collection of potentially disconnected systems.

Are green buildings more expensive to construct and operate?

Perhaps surprisingly, good green buildings often cost only a few percentage points or no more to build than conventional designs. Integrated design processes that identify the most efficient, holistic approaches to building green can reduce these initial costs. For example, in some cases, when buildings are carefully designed to be energy efficient, heating/ventilation/air conditioning (HVAC) equipment can be downsized for significant savings. There are also many green products and materials that cost the same or even less than conventional ones.

The General Services Administration (GSA) did a cost study evaluating the U.S. Green Building Council's Leadership in Energy and Environmental Design (LEED) standards, estimating the cost to develop "green" federal facilities. The study looks at two types of buildings (a courthouse and office building) and the costs associated with renovating each to the three different LEED levels: gold, silver and certified. More information is available in the final report: GSA LEED Cost Study (PDF) (578 pp., 3.9 MB, About PDF) Exit Disclaimer.

Where can I find sources of funding for my green building project?

EPA has developed a list of funding opportunities for green building on the national, state, and local levels for homeowners, industry, government organizations, and nonprofits.

Please contact us with suggestions on additional green building funding opportunities for our guide.

Can I get a tax break for building green?

There are some federal tax credits for specific energy efficiency projects in buildings. More and more states are beginning to introduce and pass legislation establishing green building tax benefits, including New York and Maryland. Links to more information regarding tax breaks for green building are available in our list of funding opportunities for green building.

Please contact us with suggestions on additional green building tax credits for our guide.

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Where can I find more information about the components of green building, like energy efficiency or reduced waste?

Please see the Components of Green Building Web page for links to EPA programs addressing energy efficiency and renewable energy, water efficiency, environmentally preferable building materials and specifications, waste reduction, toxics reduction, indoor air quality and smart growth and sustainable development.

What standards exist for green building?

Several voluntary consensus-based standards organizations are developing standards for green buildings, including:

How are buildings certified as green in the U.S.?

EPA does not have a green building certification program. However, EPA and the U.S. Department of Energy's ENERGY STARŪ addresses one of the most important aspects of green building, energy. ENERGY STAR qualifies new and renovated buildings as energy efficient, and awards the ENERGY STAR label.

There are a variety of private and non-profit green building certification programs in the marketplace including Leadership in Energy and Environmental Design (LEED) Exit Disclaimer and Green Globes Exit Disclaimer. The Public-Private Partnership for Advancing Housing Technology maintains a list of national and state Green Building Certification Programs for housing Exit Disclaimer.

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