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Sustainable Residential Design: Increasing Energy Efficiency

High Point Seattle
     High Point, Seattle, Washington. Mithun. Juan Hernandez / Mithun

Inefficient home energy use is not only costly, but also contributes to the growth of greenhouse gas (GHG) emissions, the major cause of climate change. Residential and commercial buildings use ten percent of U.S. energy. According to Architecture 2030, building construction and operations-related energy use accounts for almost 50 percent of total GHG emissions.

Through "integrated site design," a comprehensive approach to sustainable building and site design, sustainable residential landscape architecture practices can not only improve the environment, but also increase energy efficiency. If part of a broader integrated site design, sustainable residential landscape architecture can dramatically reduce energy costs over the long term while creating a healthy residential environment.


Integrated site design is a framework for increasing the quality of the built environment, and involves maximizing existing natural systems to minimize energy usage. These types of designs leverage the many benefits of natural systems, thereby significantly cutting down external energy use. Decreased energy usage also means homes are more resilient to shifts in the availability of energy and climate change.

Homeowners can use sustainable landscape architecture practice to reduce energy usage. As an example, residential green roof systems, which are often key features of integrated site design projects, can significantly reduce home heating and cooling costs. The energy efficiency benefits of sustainable landscape architecture practices, including age-old practices like tree siting for shading, can be further leveraged through the use of clean energy technologies, like solar power. Additionally, sustainable residential landscape architecture practices help reduce the rate of GHG emission growth. These types of sustainable residential solutions, if scaled up, can mitigate residential building and transportation-related emissions.

State and local governments are working with design professionals to incorporate sustainable residential landscape architecture practices into homes throughout urban, suburban and rural areas.

Other Resource Guides in this Series:

Using Low Impact Materials Button

Sustainable Design Resource Guides:



Sustainability Toolkit:

Environmental Models
Economic Models
Social Models

Organizations

Low Impact Development Center

Sustainable Sites Initiative

LEED for Homes, U.S. Green Building Council
 
Resources

Adapting to Global Warming: A Guidebook, King County, Washington

Introduction to Residential Green Building in New England, U.S. Environmental Protection Agency

"Innovations in Sustainable Site Technology," The Dirt Blog, American Society of Landscape Architects (ASLA)

Low Impact Development Design Strategies: An Integrated Design Approach, Department of Environmental Resources, Prince George's County, Maryland

Low Impact Development Manual for Michigan, Southeast Michigan Council of Governments 
 
Low Impact Development: Technical Guidance Manual for Puget Sound, Puget Sound Action Team and Washington State University

"NYC's Greener, Greater Buildings Plan" for Reducing Building CO2 Emissions," The Dirt Blog, American Society of Landscape Architects (ASLA)

"Solar Decathalon 2009 Innovations: Integrated Site Design," The Dirt Blog, American Society of Landscape Architects (ASLA)

Sustainable Gardening. Recycle Works: A program of San Mateo County, California

Weatherization Guide for Older and Historic Buildings, National Trust for Historic Preservation

Research

"Living Systems: Innovative Materials and Technologies for Landscape Architecture," Liat Margolis & Alexander Robinson, Birkhauser Basel, 2007

"Sustainable Landscape Construction: A Guide to Green Building Outdoors," J. William Thompson & Kim Sorvig, Island Press, 2007

Projects

High Point, Seattle, Washington
Mithun

One Drop at a Time – New Resourceful Paradigms at 168 Elm Ave, Elmhurst, IL
de la fleur LLC
 
Residential Green Roofs

Green roofs are energy-efficient vegetated roof systems. Once installed, they often last longer than conventional roofs. While the energy saving benefits of commercial green roofs are already well known, residential green roofs can also dramatically improve building energy efficiency. Green roofs regulate buildings' internal temperature and reduce building heating and cooling costs. 

Green roofs also function as more sustainable, decentralized stormwater management systems. Green roofs can reduce stormwater run-off, and decrease the energy costs associated with extending and upgrading centralized (and costly) stormwater management systems.

Green roofs benefits include:

  • Cost-efficiency: A University of Michigan study showed that more than 50 percent of the cost associated with installing a green roof will be returned in the form of lower maintenance and reduced energy usage over the lifetime of the green roof system.“Nearly two-thirds of these savings would come from reduced energy needs for the building with the green roof.”
  • Energy savings: A typical 2-3 story building could experience 15-25 percent savings in summertime energy costs.
  • Lower air temperatures:  A modeling study found that adding green roofs to 50 percent of the available surfaces in downtown Toronto would cool the entire city by 0.2 to 1.4°F (0.1 to 0.8°C).
  • More efficient stormwater management: Green roofs can catch 40-60 percent of stormwater, reducing flow into a city’s sewers
  • Lower long-term maintenance costs:  Green roofs can extend a roof’s lifespan by two or three times. According to Sustainable South Bronx, a non-profit organization, on a 90 degree day a green roof is about 80°F, while a black roof is 175°F. The higher temperatures cause substantial wear and tear.

Sources: “Reducing Urban Heat Islands: Compendium of Strategies, Green Roofs,” U.S. Environmental Protection Agency and Sustainable South Bronx.

Organizations

Centre for Architectural Ecology, British Columbia Institute of Technology

Center for Green Roof Research, Pennsylvania State University

Green Roofs for Healthy Cities

International Green Roof Association

Lady Bird Johnson Wildflower Center / Green Roof Resources 

Living Roofs (United Kingdom)

Resources

Ecoroof Q&A, Environmental Services, City of Portland, Oregon

Green Roofs Benefits, Green Roofs for Healthy Cities

Green Roofs – Cooling Los Angeles: A Resource Guide, Environmental Affairs Department, City of Los Angeles, California

Green Roof Research Program, Department of Horticulture, Michigan State University

Green Roofs Sequester CO2, The Dirt Blog, American Society of Landscape Architects (ASLA) 

Green Roof Tax Credits, ASLA Advocacy

Residential Buildings: Roofs, U.S. Department of Energy
 
What is a Green Roof ?, How Stuff Works.com

Research

"Living Architecture Monitor," Green Roof for Healthy Cities, 2008

"Green Roof Plants: A Resource and Planting Guide," Edmund C. & Lucie L. Snodgrass, Timber Press, 2006

"Green Roof Systems: A Guide to the Planning, Design, and Construction of Building Over Structure," Susan Weiler & Katrin Scholz-Barth, Wiley, 2005
 
"Roof Gardens: History, Design, and Construction," Theodore H. Osmundson, W. W. Norton & Co. 1997
 
Government Resources

City of Toronto Green Roof Bylaw, Toronto, Canada

Green Roof and Cool Roof Grant Program, City of Chicago, Illinois, United States

Illinois Energy Plan: Green Roof Program, State of Illinois

The London Plan: Living Roofs and Walls, City of London

"Tax Credits for Green Roofs in NYC," Environmental Leader, June 29, 2008.

Projects

Big Sur, Big Sur, California
Fred Ballerini

Feldman Residence, Santa Lucia Preserve, Carmel, California
Blasen Landscape Architecture
 
The Louisa, Portland, Oregon
Walker Macy Landscape Architects

Macallen Building Condominiums, Boston, Massachusetts
Landworks Studio, Inc

North Beach Place, San Francisco, California
PGA Design, Inc 

Tables of Water, Lake Washington, Washington
Charles Anderson Landscape Architecture, Seattle, Washington

Woody Creek Garden, Pitkin County, Colorado
Design Workshop, Inc., Aspen, Colorado

Residential Green Walls 

Like green roofs, green walls, also called vertical gardens, are vegetated walls that can be used indoors or outdoors. Green walls can increase energy efficiency, reduce indoor and outdoor temperatures, and improve air quality.

Green walls can be designed for a variety of plant types, including herbs or succulents, and can be placed in either sun or shade. Edible herb or vegetable walls provide food sources. However, climate and humidity should be considered when installing green walls.

Green walls include most of the benefits of green roofs, but also include:

  • Cost-efficiency: Through shading, green walls can lower temperatures in summer and reduce energy costs by 23 percent.
  • Reduced air temperatures: Temperatures behind green walls can be reduced by as much as 10 degree celsius.
  • Reduced Noise Pollution:  Green walls can help reduce sound reflection

Sources: “Living Walls: A Way to Green the Environment” Susan Loh, Australian Council of Built Environment Design Professionals, August 2008  

Organizations

Centre for Architectural Ecology, British Columbia Institute of Technology

National Gardening Association

Vertical Farm 
 
Resources

"How to make a Green Wall," Green Living, Love to Know.com

"Inspiring Vertical Gardens for Small Spaces," Bridgette Meinhold, Low Impact Living, 2009

"Introduction to Green Walls Technology, Benefits & Design," Greenroof for Healthy Cities, September 2008 

"Six Things You need to know about Green Walls," Randy Sharp, Building Design and Construction Network, 2007

Research

"Planting Green Roofs and Living Walls," Nigel Dunnett & Noel Kingsbury, Timber Press, 2008

"The Vertical Garden: From Nature to the City," Patrick Blanc, W.W. Norton & Co., 2008

"Greenbacks from Green Roofs: Forging a New Industry in Canada," Canada Mortgage and Housing Corporation, 2007

"Vertical Gardens," Anna Lambertini. Verba Volant, 2007
 
Government Resources

"The Hanging Gardens of Tower Blocks: A Low-carbon European Vision," Times Online (UK), July 2009. 

Vertical Garden Grants Program, Central Houston Downtown District, May 2009

Vertical Garden Grant Initiative, Anton Sinkewich, Central Houston, 2008 

Projects

Horizon Residence, Venice, California
Marmol Radziner and Associates, Los Angeles, Calfornia

Vertical Garden, Los Angeles, California
Mia Lehrer & Associates

Vert Rain Terrace, Michael Tampilic

Residential Tree Placement for Energy Efficiency

Homeowners can plant shade trees to insulate residential buildings and minimize home heating and cooling costs. Tree can be optimally sited around homes to increase energy efficiency. Certain types of trees can provide heating in winter and cooling effects in summer.

Under legislation proposed by Congresswoman Doris Matsui, The Energy Conservation Through Trees Act, utility companies could also apply for grants to partner with non-profit tree planting groups, who would help determine the correct types of trees to plant and distribute to consumers. The tree planting organizations would also help educate the public on the benefits of shade trees and on proper care and maintenance strategies. 

Organizations

Alliance for Community Trees

Arbor Day Foundation 

Casey Trees

Human Dimensions of Urban Forestry and Urban Greening, College of Forest Resources, University of Washington

National Urban and Community Forestry Advisory Council

Yale University School of Forestry and Environmental Studies 

Tree Planting Programs

BillionTrees Campaign, United Nations Environment Program (UNEP) 

Green Miami (Increase tree cover to 30 percent by 2017)

Grow Greener Boston (100,000 new trees by 2020)

Leading to a Greener London (Two million trees by 2025)

Million Trees NYC (Part of PlaNYC

Million Trees L.A. (Target is one million new trees)

Plant-It 2020

TreeBaltimore (Double tree cover from 20 percent to 40 percent within 30 years)

TreeLink

Resources

Energy Saving Landscapes, Sustainable Urban Landscape Information Series, University of Minnesota

Free Shade Trees, Sacramento Municipal Utility District

Landscaping Your Home for Energy Efficiency, Morton Arboretum

Trees and Home Energy Savings, Washington, D.C., Casey Trees

Government Resources

Green Urban Design, City of Chicago

Landscaping, Energy Efficiency and Renewable Energy, U.S. Deparment of Energy

Trees and Vegetation, Heat Island Effect Resources, U.S. Environmental Protection Agency    

Urban and Community Forestry, United States Forest Service

U.K. Forestry Commission

Research

"The Passive Solar House," James Kachadorian, Chelsea Green Publishing Company, 2006

Residential Solar power


The use of photovoltaic solar power systems on homes is growing in popularity. A number of U.S. states, including California, provide a range of incentives for homeowners to install rooftop solar energy systems, giving homeowners the opportunity to reduce energy costs and even sell their energy back to the central grid. Germany and a number of Scandinavian countries are leaders in residential solar power use.

If added through an integrated site design process, solar power systems can leverage other energy efficiencies. For instance, photovoltaic panel systems can be combined with green roofs, doubling benefits, and extending the value of solar systems. Although the initial cost of installing solar panels is costly, over the long run “homeowner could expect to see a 142 percent return on his or her investment.”

Residential solar power benefits include:

  • Cost efficiency: Solar panels can significantly reduce electricity bill especially during winter time
  • Economic incentives: Net metering and tax incentives
  • Grid-connection: Homeowners can sell excess power back to the central grid  

Sources: "A Consumer’s Guide: Get your Power from the Sun," U.S. Department of Energy and "5 Ways to Greenify Your Home," How Stuff Works.com

Organizations

American Solar Energy Society

Go Solar California

Solar Home.org

Resources

"5 Ways to Greenify Your Home," How Stuff Works

A Consumer’s Guide: Get your Power from the Sun, U.S. Department of Energy

Active Solar Heating, U.S. Department of Energy

Solar Panel Guide, eHow

Research

"Photovoltaics: Design and Installation Manual," Solar Energy International, New Society Publishers, 2004

"The Solar Electricity Handbook 2009," Michael Boxwell, Code Green Publishing, 2009

Government Resources

California Energy Commission 

Clean Energy Program, State of New Jersey

Consumer Energy Tax Credits, U.S. Department of Energy

Federal Tax Credits for Energy Efficiency, Energy Star

Rebates and funding: Energy Efficient Homes Package, Deparment of Environment, Water, Heritage and Arts, Australian Government

Residential Energy Tax Credits for Solar, State of Oregon

Solar Initiatives, Solar Energy Technologies Program, Energy Efficiency and Renewable Energy, U.S. Department of Energy

Projects

Solar Decathlon, U.S. Department of Energy



 If you know of useful resources we've missed, please send your recommendations to: info@asla.org



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