Green buildings sit within a much larger building and construction system. In 2022, buildings used 34% of global energy demand, while buildings and construction produced 37% of global energy- and process-related CO2 emissions; the broader sector contributed about 21% of global greenhouse-gas emissions.
These figures include ordinary buildings and construction, not only certified projects.
Key Green Building Statistics
The following figures summarize the most useful global, U.S., program-level and measured green-building data:
- In 2022, global buildings accounted for 34% of global energy demand.
- In 2022, buildings and construction produced 37% of global energy- and process-related CO2 emissions.
- In the 2022 report, buildings and construction contributed about 21% of global greenhouse-gas emissions worldwide.
- In 2022, U.S. buildings represented 38% of total primary energy use across residential and commercial buildings.
- In 2022, U.S. buildings consumed 74% of electricity generated from primary energy sources.
- In 2023, global building-energy-efficiency investment fell 7% to $270 billion.
- In 2023, only 4% of global building-construction investment went to green and energy-efficient projects.
- In 2024, 85 countries had residential building energy codes, and 80% of those codes were mandatory.
- In 2024, renewables supplied 17% of total building energy demand globally.
- By the end of 2023, more than 43,000 U.S. buildings had earned ENERGY STAR certification.
- During 2023, more than 8,800 U.S. commercial buildings earned ENERGY STAR certification.
- ENERGY STAR-certified U.S. commercial and multifamily buildings used an average of 35% less energy than typical buildings.
- By the end of 2023, U.S. ENERGY STAR-certified buildings had saved nearly $6 billion on energy bills cumulatively.
- By the end of 2023, those certified U.S. buildings had prevented more than 23 million metric tons of reported GHG emissions.
- A study of 2,657 Australian certified office-building records found 184.45 MJ/m2 less annual energy use per one NABERS rating-level rise.
- DOE/PNNL modeling estimated 29% average commercial-building controls savings across 14 building types and 16 U.S. climate zones.
- Since 2011, U.S. DOE Better Buildings commercial real-estate partners had saved $610 million through energy and water-efficiency measures.
- DOE’s Building America evaluation estimated $875 million in combined energy-cost and environmental-health benefits over 10 years.
- DOE estimated $40 billion in annual potential energy-cost savings if one project in each BENEFIT technology area reached mass adoption.
Contents
- Global green building energy, emissions and material scale
- Green building trends in codes, renewables and investment
- LEED and ENERGY STAR adoption data
- Measured green building energy, emissions and water outcomes
- Green building retrofits, controls and technology savings
- Green building costs, finance and implementation
Global Green Building Energy, Emissions and Material Scale
The global baseline shows why green-building measures matter, but these sector statistics are not certification statistics. UNEP’s Global Status Report for Buildings and Construction reports that buildings were responsible for 34% of global energy demand in 2022, and buildings plus construction produced 37% of global energy- and process-related CO2 emissions.
The same 2022 report estimated that buildings and construction contributed about 21% of global greenhouse-gas emissions. The boundaries differ: the 37% figure concerns energy- and process-related CO2, while the 21% figure is a broader GHG estimate.
In the United States, DOE’s National Blueprint for the Buildings Sector placed buildings at 38% of total primary energy across residential and commercial buildings in 2022, and at 74% of electricity generated from primary energy sources.
| Measure | Figure | Scope and period |
|---|---|---|
| Global building energy demand | 34% | Global buildings, 2022 |
| Global energy- and process-related CO2 | 37% | Buildings and construction, 2022 |
| U.S. primary energy | 38% | Residential and commercial buildings, 2022 |
| U.S. electricity | 74% | Buildings, 2022 |
IEA’s Breakthrough Agenda Report 2024: Buildings estimates that residential buildings account for about 70% of global building energy demand, leaving commercial and public buildings with the remaining 30% in its rounded sector split. It also reports that global building-sector emissions grew by an average 0.7% per year from 2015 onward despite lower energy intensity.
Green Building Trends in Codes, Renewables and Investment
Investment and policy coverage remain uneven. UNEP/GlobalABC’s Global Status Report for Buildings and Construction 2024/2025: Key Messages reports $290 billion in global building-energy-efficiency investment in 2022, followed by a 7% decline to $270 billion in 2023.
Only 4% of total building-construction investment went to green and energy-efficient projects in the 2023 report. This is an investment definition used by UNEP/GlobalABC, not a count of all buildings that include one efficient feature.
The same source reports the following policy and materials indicators:
- Eighty-five countries had residential building energy codes in 2024, and 80% of those countries’ codes were mandatory; the denominator is countries with codes, not all countries.
- More than 50% of nearly 51 billion square meters of new floor area in emerging and developing economies remained outside building-code coverage during the report period.
- Only three countries updated building codes in 2024 under the report’s tracking system.
- Renewables supplied 17% of total building energy demand in the 2024 report.
- Recycled materials represented 18% of construction inputs in Europe in the 2024 report.
- The recommended retrofit rate is three times the current rate by 2030 to achieve a 35% reduction in energy intensity; this is a policy pathway, not an observed outcome.
LEED and ENERGY STAR Adoption Data
Certification counts measure participation in named programs rather than the full universe of green buildings. EPA’s ENERGY STAR certified buildings release reports more than 43,000 U.S. commercial and multifamily buildings certified by the end of 2023, including more than 8,800 buildings certified during 2023.
EPA compares certified buildings with typical buildings using a certification threshold of at least 75. ENERGY STAR-certified buildings used an average of 35% less energy and produced an average of 35% less carbon dioxide than typical buildings; by the end of 2023, the certified portfolio had saved nearly $6 billion on energy bills and prevented more than 23 million metric tons of reported GHG emissions.
| U.S. ENERGY STAR measure | Result | Period |
|---|---|---|
| Buildings certified cumulatively | More than 43,000 | End of 2023 |
| Buildings certified during year | More than 8,800 | 2023 |
| Average energy reduction | 35% | EPA comparison |
| Cumulative energy-bill savings | Nearly $6 billion | Through end of 2023 |
The 2023 top-cities list counted 876 ENERGY STAR-certified buildings in the Los Angeles metropolitan area, 631 in the Washington, D.C. metropolitan area, 390 in the New York metropolitan area, 373 in Atlanta and 368 in San Francisco. These are metropolitan-area counts, not city-proper totals.
USGBC’s Top 10 States for LEED in 2024 recorded 132 LEED-certified projects and more than 34 million square feet in Massachusetts, plus 90 projects and 23.3 million square feet in Washington state. California’s 2024 state table listed 437 LEED residential projects and 26,195 LEED credential holders; credential holders are people, not certified buildings.
Measured Green Building Energy, Emissions and Water Outcomes
The peer-reviewed NABERS database analysis examined 2,657 certified Australian office-building records with post-occupancy performance data. Its results are associations across certified offices, not randomized causal estimates or a random sample of all Australian offices.
| One NABERS rating-level rise was associated with | Average annual difference | Population |
|---|---|---|
| Energy use | 184.45 MJ/m2 less | Australian certified offices |
| Emissions | 41.94 kg CO2e/m2 less | Australian certified offices |
| Water consumption | 0.24 t/m2 less | Australian certified offices |
The study also cited an earlier measured-data analysis of 100 U.S. LEED commercial and institutional buildings that found 18% to 39% less energy per floor area than conventional counterparts. That range comes from the cited separate study and should not be generalized to every LEED building.
Green Building Retrofits, Controls and Technology Savings
DOE’s Building Technologies Office accomplishments reports that Better Buildings commercial real-estate partners represented 1.4 billion square feet and collectively saved $610 million through energy and water-efficiency measures since 2011, as reported in 2024. Multifamily partners represented 650 million square feet and saved $350 million through similar measures since 2013.
DOE/PNNL’s commercial controls report modeled average controls savings at 29% across 14 building types and 16 U.S. climate zones. The model estimated about 8% from adjusting temperature setpoints, 7% from reducing minimum variable-air-volume airflow rates and 6% from limiting heating and cooling to likely occupied periods; these measure estimates can overlap.
Secondary schools had modeled controls savings potential of about 49%, while standalone retail stores and auto dealerships had potential of about 41%. These are modeled potentials, not measured averages in every building.
DOE’s 2024 BENEFIT portfolio included $38.8 million for 25 projects across 17 states. Its Building America evaluation estimated $875 million in combined energy-cost and environmental-health benefits over 10 years against $162 million in program cost, and reported a 30.2% internal rate of return on BTO funding; these are program-evaluation measures, not guaranteed project-level returns.
Green Building Costs, Finance and Implementation
Green-building finance includes realized program savings, modeled potential and demonstrations, which should not be treated as interchangeable. DOE estimated $40 billion in annual potential energy-cost savings if one project in each BENEFIT technology area reached mass adoption; the assumption makes this a forecast, not realized market savings.
DOE’s EAS-E retrofit demonstration projected 33% to 54% lower upfront retrofit costs for a 184-unit multifamily home compared with the status quo. That is a single winning approach or project estimate, not an average reduction for all multifamily retrofits.
Other DOE implementation figures include the following:
- The Buildings UP prize provided $22 million and had 45 phase-one winners across 32 states in 2024; participation is not an adoption rate.
- The resilient-code implementation program provided $90 million for 25 projects across 15 states plus regional and national collectives during 2023–2024.
- DOE estimated $3.8 billion in annual potential energy-cost savings from those resilient-code projects, based on application estimates rather than verified realized savings.
- DOE’s retrofit reference-building set characterizes 70% of U.S. commercial buildings; this is model/reference-building coverage, not a physical survey or certification share.
DOE’s Buildings Energy Efficiency page reports that 90% of people’s time is spent in buildings, that buildings use 74% of U.S. electricity and that U.S. buildings account for $370 billion in annual energy costs. The page presents these as public-summary estimates, and does not state a single survey year for all three figures.