The U.S. Energy Information Administration has posted preliminary results from its periodic Commercial Buildings Energy Consumption survey. Data for the project were collected in 2012 and detailed analyses of energy consumption will be released beginning next spring. The project includes buildings >1,000 sf that devote more than half of their floorspace to activity that is not residential, manufacturing, industrial, or agricultural.
The preliminary results from the Commercial Buildings Energy Consumption Survey (CBECS) show that there were 5.6 million commercial buildings in the United States in 2012, comprising 87.4 billion square feet of floorspace. This represents a 14% increase in the number of buildings and a 22% increase in floorspace since 2003, the last year for which CBECS results are available.
The preliminary data can be found in this summary table of building counts and total square footage by building size category, principal building activity, year of construction category, Census region, and Census division. The first tab provides the estimates; the second tab on the table provides relative standard errors (RSEs) for the estimates.
For comparison, there is a similar summary table from the 2003 CBECS. Other file formats for the same table can be accessed from the 2003 CBECS data page.
The size, use, vintage, and geographic region of a building are among the key determinants that influence its energy use. Subsequent releases will show more detailed characteristics and crosstabulations among key categories. This is the first release of many reports and data releases expected for the 2012 CBECS; these preliminary tables provide a first look at the building stock and the attributes that drive commercial energy use.
Trends – 1979 to 2012: Growth in building size outpaces increases in building stock
Since the first CBECS was conducted in 1979 to the current 2012 CBECS, the number of buildings has increased from 3.8 million to 5.6 million, and the amount of commercial floorspace has increased from 51 billion to 87 billion square feet.
HOW DOES EIA PRODUCE RELIABLE RESULTS FROM A SAMPLE SURVEY?
The CBECS is a national sample survey. See How Were Buildings Selected for the 2012 CBECS? for an overview of the sampling process. After the sample was selected, preparations for the interviewing phase began. In April 2013, about 250 field interviewers were trained to visit buildings across the United States and recruit respondents knowledgeable about energy use in the buildings. After recruiting a respondent at a building, the field interviewer’s job was to conduct an interview on a laptop computer asking questions about the building’s structure, use, energy equipment, and energy use. Between April and November 2013, interviews were conducted in-person or by telephone at over 6,500 buildings nationwide. Because every building had a chance to be selected and that chance is known, a sample weight can be assigned to each case. The resulting dataset is representative of the entire U.S. commercial building population.
Principal building activities: The most prevalent building types account for the majority of the total buildings and floorspace, while the building types with the largest average buildings are less common in the building stock
The commercial building sector is characterized by diversity. The 2012 survey identified more than 100 subcategories of building activity, which are aggregated into the 14 principal building activities shown in the summary table and in the figures below. CBECS includes buildings as small and singular in activity as a freestanding bank or fast food restaurant, to buildings as large and complex as an office building with hundreds of tenants or a major airport terminal. CBECS also includes vacant buildings; some vacant buildings use energy, either for maintenance purposes or because a small amount of space is still used in the building1.
Among the general building activities, lodging, education, and health care are the largest buildings, on average. The health care category's average is greatly affected by the size of inpatient health care buildings (i.e., hospitals), which have an average size of 247,700 square feet per building, compared to outpatient health care buildings, which have an average size of 12,100 square feet.
Figure 4 tracks changes in the building stock over the past 10 years by comparing the number of buildings for each principal building activity from 2003 to 2012. The highest percent of growth was in vacant buildings and other types of buildings, which includes buildings such as airplane hangars, laboratories and data centers. Warehouses, food service buildings, public assembly, and office buildings also increased between 2003 and 2012, while food sales buildings (e.g., grocery and convenience stores) showed a decrease,2 and mercantile (retail and malls) showed a decrease, although it is not statistically significant. Because CBECS is a sample survey, each estimate has sampling error associated with it, which should be considered when comparing estimates. See What is an RSE? and Estimation of Standard Errors for more information.
Size of buildings: Although there are relatively few very large buildings (over 100,000 square feet of floorspace), they account for more than one-third of total commercial building floorspace
Commercial buildings are often depicted showing a skyline of towering buildings. However, the vast majority of commercial buildings are relatively small. Just less than half of buildings are 5,000 square feet in size or smaller, and nearly three-fourths are 10,000 square feet or smaller. The median building size is 5,100 square feet (i.e., half the buildings are larger than this and half are smaller), while the average size is 15,700 square feet. The average is larger than the median because of the influence of a small number of very large buildings; buildings over 100,000 square feet make up only about 2% of the building count but about 35% of the total floorspace.
Year constructed: The commercial building stock is middle-aged, and newer buildings are larger than older ones
Commercial buildings remain in use for many decades. Although about 12% of commercial buildings (comprising 14% of commercial floorspace) were built in the past 10 years, the commercial building stock is still fairly old, with about half of all buildings constructed at least 35 years ago. However, in the existing building stock, there are more buildings built in the 2000s than buildings built prior to 1946.
Newer buildings tend to be larger than older buildings. The average building size for those constructed before 1960 is 12,000 square feet; buildings constructed between 1960 and 1999 average 16,300 square feet; and buildings constructed in the 2000s average 19,100 square feet. The differences between these average building sizes are statistically significant.
Census region and division (see map): The South has the most commercial buildings, but the Northeast has the largest commercial buildings
The South Census region, the most populous of the four Census regions, has the largest percentage of commercial buildings and commercial floorspace, with about 40% of both total buildings and floorspace. The Midwest and West regions each account for more than one-fifth of commercial buildings and floorspace.
Buildings in the Northeast region are, on average, 4,000 to 5,000 square feet larger than buildings in the other regions. The Northeast region includes the Middle Atlantic division (New York, Pennsylvania, and New Jersey), where buildings average 22,400 square feet.
Footnote
1 CBECS principal building activity is defined as the activity occupying the most floorspace. Respondents are first asked if there is one activity that occupies 75% or more of the floorspace. If not, CBECS collects the top three building activities and their corresponding percents and the principal activity is assigned as the one comprising the most floorspace.
2 Estimates for number of food sales buildings can be somewhat misleading because grocery stores and convenience stores are often part of strip malls and therefore included in the "Enclosed and strip malls" category in CBECS. "Enclosed and strip malls" is a subcategory of "Mercantile" and is shown in the summary table.
Specific questions on this product may be directed to Joelle Michaels.
Related Stories
AEC Tech Innovation | Oct 8, 2024
New ABC technology report examines how AI can enhance efficiency, innovation
The latest annual technology report from Associated Builders and Contractors delves into how artificial intelligence can enhance efficiency and innovation in the construction sector. The report includes a resource guide, a case study, insight papers, and an essay concerning applied uses for AI planning, development, and execution.
Healthcare Facilities | Oct 8, 2024
Herzog & de Meuron completes Switzerland’s largest children’s hospital
The new University Children’s Hospital Zurich features 114 rooftop patient rooms designed like wooden cottages with their own roofs. The project also includes a research and teaching facility.
Mixed-Use | Oct 7, 2024
New mixed-use tower by Studio Gang completes first phase of San Francisco waterfront redevelopment
Construction was recently completed on Verde, a new mixed-use tower along the San Francisco waterfront, marking the end of the first phase of the Mission Rock development. Verde is the fourth and final building of phase one of the 28-acre project that will be constructed in several phases guided by design principles developed by a design cohort led by Studio Gang.
Brick and Masonry | Oct 7, 2024
A journey through masonry reclad litigation
This blog post by Walter P Moore's Mallory Buckley, RRO, PE, BECxP + CxA+BE, and Bob Hancock, MBA, JD, of Munsch Hardt Kopf & Harr PC, explains the importance of documentation, correspondence between parties, and supporting the claims for a Plaintiff-party, while facilitating continuous use of the facility, on construction litigation projects.
Glass and Glazing | Oct 7, 2024
Pattern language: An exploration of digital printing on architectural glazing
Architectural Glazing has long been an important expressive tool which, when selected and detailed thoughtfully, can contribute to the successful transformation of architectural concepts to reality.
University Buildings | Oct 4, 2024
Renovations are raising higher education campuses to modern standards
AEC higher ed Giants report working on a variety of building types, from performing arts centers and libraries to business schools. Hybrid learning is seemingly here to stay. And where possible, these projects address wellness and mental health concerns.
AEC Tech | Oct 3, 2024
4 ways AI impacts building design beyond dramatic imagery
Kristen Forward, Design Technology Futures Leader, NBBJ, shows four ways the firm is using AI to generate value for its clients.
Laboratories | Oct 2, 2024
Trends in scientific research environments: Q&A with Flad's Matt McCord
As part of an ongoing series, Matt McCord, AIA, NCARB, LEED AP BD+C, Associate Principal with Flad Architects, discusses the future of the scientific workplace.
Museums | Oct 1, 2024
UT Dallas opens Morphosis-designed Crow Museum of Asian Art
In Richardson, Tex., the University of Texas at Dallas has opened a second location for the Crow Museum of Asian Art—the first of multiple buildings that will be part of a 12-acre cultural district. When completed, the arts and performance complex, called the Edith and Peter O’Donnell Jr. Athenaeum, will include two museums, a performance hall and music building, a grand plaza, and a dedicated parking structure on the Richardson campus.
Data Centers | Oct 1, 2024
10 biggest impacts to the data center market in 2024–2025
While AI sends the data center market into the stratosphere, the sector’s accelerated growth remains impacted by speed-to-market demands, supply chain issues, and design innovation necessities.
