Energy retrofit statistics show a large gap between the building stock that needs improvement and the pace of renovation. The figures below distinguish observed program results from estimates, technical potential and scenario forecasts across the European Union, IEA markets and a US residential program.
Key Energy Retrofit Statistics
The most useful headline figures are:
- In the current European Union building-stock estimate, about 75% of buildings have poor energy performance.
- In the current European Union estimate, around 1% of buildings are renovated each year.
- A 2021 European Union projection estimates around 80% of today’s buildings will still be in use in 2050.
- The same projection estimates about 75% of the building stock expected in 2050 will be energy inefficient.
- In the IEA pathway, space-heating energy consumption falls almost 70% between 2022 and 2050 in the global buildings sector.
- In that pathway, heat pumps provide 12% of space-heating service demand in 2022 globally.
- The IEA pathway raises heat pumps to 55% of global space-heating service demand by 2050.
- Global building heat-pump capacity rises from 1,000 GW in 2022 to 6,500 GW in 2050 in the IEA pathway.
- In the same pathway, zero-carbon-ready buildings reach 20% of existing building stock by 2030 globally.
- The IEA pathway reaches 80% of existing building stock as zero-carbon-ready by 2050.
- In a 2010 Orlando Utilities Commission study, 297 retrofit participants averaged 1,963 kWh, or 10.6%, in first-year energy savings.
- In that study, all heat-pump participants averaged 2,128 kWh of first-year savings.
- A monitored group-home retrofit in IECC climate zone 4 achieved 41% annual energy savings over an 11-month post-retrofit period.
- Building energy-efficiency measures implemented in the European Union during 2020–2024 achieved around 25 Mtoe of energy savings.
- Deep renovation has an estimated potential to save almost 60% of current European Union building consumption.
- Almost 36% of European Union natural-gas imports are used for heating in buildings.
- IEA-member energy-efficiency improvements since 2000 saved approximately 24% of energy use by 2021.
- The IEA estimated 9–30 jobs per US$1 million invested in building energy-efficiency measures.
Contents
- Building stock scale and renovation rates
- Heating demand and zero-carbon-ready buildings
- Residential retrofit savings and measure performance
- Retrofit costs, rebates and bill savings
- Energy renovation, gas demand and household impacts
- Investment, efficiency trends and workforce effects
Energy Retrofit Statistics: Building Stock Scale and Renovation Rates
The European Union’s building challenge is defined by both condition and turnover. The European Commission estimates that about 75% of EU buildings have poor energy performance, while the annual energy renovation rate is around 1%; poor performance is not the same thing as a completed retrofit, and the rate does not indicate renovation depth. Energy renovation of buildings
| Measure | Period or horizon | Figure | Geography and definition |
|---|---|---|---|
| Poor-performing buildings | Current estimate | About 75% | EU building stock |
| Annual renovation rate | Current estimate | Around 1% | EU buildings per year |
| Buildings remaining in use | 2021 projection to 2050 | Around 80% | Today’s EU buildings |
| Inefficient stock in 2050 | 2021 projection | About 75% | EU stock expected in 2050 |
The JRC’s 2021 study projects that around 80% of today’s buildings will remain in use in 2050, and that about 75% of the stock expected in 2050 will be energy inefficient. Its scenario says raising annual renovation above 2% for ten years and maintaining that pace could renovate almost 80% of existing homes by 2050; the result depends on the stated rate, maintenance and stock assumptions. Buildings Renovation: data supporting investment measures
The IEA describes average annual building energy-retrofit rates as below 1% in most major markets in its assessment published in 2020. This is a cross-market summary, and definitions and years vary by market, so it should not be combined mechanically with the EU estimate. Space heating
Energy Retrofit Data on Heating Demand and Zero-Carbon-Ready Buildings
The IEA pathway describes a much faster transition than current observed renovation rates. It is a scenario, not an observed retrofit trend: space-heating energy consumption in the global buildings sector falls almost 70% from 2022 to 2050 while heated floor area rises from 157 billion m² in 2022 to 200 billion m² in 2050. Space heating
| IEA pathway milestone | 2022 | 2030 | 2035 | 2050 |
|---|---|---|---|---|
| Heat-pump share of space-heating service demand | 12% | 25% | 40% | 55% |
| Building heat-pump capacity | 1,000 GW | 3,000 GW | 4,400 GW | 6,500 GW |
| Existing stock that is zero-carbon-ready | — | 20% | 35% | 80% |
Zero-carbon-ready buildings are below 1% of new buildings and deep renovations in 2022 in the IEA pathway, reaching 100% by 2030. The category combines new buildings and deep renovations, while the existing-stock milestones are separate scenario measures.
The pathway uses a 2.5% annual retrofit rate in advanced economies from 2030 through 2050. That is a required pathway rate, not current observed performance, and the scenario assumes zero-carbon-ready codes and increasingly efficient equipment.
Residential Retrofit Energy Savings and Measure Performance
The US Department of Energy’s Housing Stock Characterization Study measured first-year results for program participants in Orlando Utilities Commission territory in 2010. The study covered 297 homes across ceiling insulation, duct repair or replacement and heat-pump programs; the results are participant and comparison analyses, not universal guarantees. Housing Stock Characterization Study: An Innovative Approach to Measuring Retrofit Impact
| Retrofit measure or subgroup | Participants | First-year average savings |
|---|---|---|
| Ceiling insulation | 44 | 1,266 kWh |
| Duct repair or replacement | 17 | 1,499 kWh |
| All heat pumps | 236 | 2,128 kWh |
| All retrofit participants | 297 | 1,963 kWh, or 10.6% |
Heat-pump results varied by SEER rating. SEER 14 participants averaged 1,125 kWh, SEER 15 averaged 1,967 kWh, SEER 16 averaged 2,696 kWh, SEER 17 averaged 2,783 kWh and SEER 18 averaged 1,108 kWh; the SEER 14 subgroup had 15 participants and a 95% confidence interval that included negative savings, while the SEER 18 estimate was not statistically significant.
The all-participant absolute-savings estimate had a 95% confidence interval of 1,670–2,257 kWh. Subgroup intervals were 506–2,025 kWh for ceiling insulation, 278–2,720 kWh for duct repair, 1,799–2,456 kWh for all heat pumps, 1,538–2,397 kWh for SEER 15, 1,937–3,456 kWh for SEER 16 and 1,878–3,687 kWh for SEER 17.
The results illustrate why retrofit outcomes vary with measure mix, climate, building condition and the comparison model. A separate DOE Building America case study of one occupied group home in IECC climate zone 4 recorded 41% annual energy savings over 11 months after retrofit, compared with an initial modeled estimate of 44% and a revised modeled estimate of 22%; the long-term result had a savings-to-investment ratio of 2.2. Occupant-in-Place Energy Efficiency Retrofit in a Group Home for 30% Energy Savings in Climate Zone 4
Energy Retrofit Costs, Rebates and Bill Savings
The Orlando program provides historical evidence on incentives and electricity-bill outcomes, not current installation prices. All dollar figures below are nominal 2010 program amounts, and rebate cost per kWh is a program calculation that excludes broader homeowner costs. Housing Stock Characterization Study: An Innovative Approach to Measuring Retrofit Impact
| Participant group | Average rebate | Average first-year bill savings | Rebate cost per first-year kWh saved |
|---|---|---|---|
| Ceiling insulation, 44 participants | $280 | $152 | $0.22/kWh |
| Duct repair, 17 participants | $300 | $180 | $0.20/kWh |
| All heat pumps, 236 participants | $458 | $255 | $0.22/kWh |
| All participants, 297 participants | $422 | $236 | — |
Within the heat-pump subgroups, average rebate cost per first-year kWh saved ranged from $0.18 for SEER 14 to $0.54 for SEER 18. The small subgroup sizes and historical rebate structure limit generalization, and bill savings reflect the utility rates and program population of the study year.
Energy Renovation Savings, Gas Demand and Household Impacts
The European Commission estimates that building energy-efficiency measures implemented in the EU during 2020–2024 achieved around 25 Mtoe of energy savings. This is a cumulative gross-savings estimate across measures, not the measured outcome of one retrofit program. Energy renovation of buildings
The JRC estimates that deep renovation could save almost 60% of current building consumption in the studied EU stock. Its scenario translates that technical potential into about 10% lower current total EU primary energy consumption, but the figure is a scenario result rather than realized savings across all buildings. Buildings Renovation: data supporting investment measures
| EU energy and demand indicator | Period or scenario | Figure |
|---|---|---|
| Building-efficiency savings | 2020–2024 | Around 25 Mtoe |
| Deep-renovation potential | 2021 estimate | Almost 60% of current building consumption |
| Effect on total primary energy | 2021 scenario | About 10% reduction |
| Peak monthly building gas demand | 2040 scenario | 25% reduction |
The 2040 gas-demand scenario requires a 2% annual EU building-stock retrofit rate plus some heat electrification. Separately, almost 36% of EU natural-gas imports are used for heating in buildings, while EU households consume more than 75% of their energy for heating, cooling and domestic hot water; the latter is a combined end-use share, not heating alone. Energy renovation of buildings
Energy Efficiency Retrofit Trends, Investment and Workforce Effects
The IEA’s efficiency indicators estimate that energy-efficiency improvements since 2000 saved approximately 24% of energy use by 2021 across IEA members. Buildings accounted for 23% of those aggregate efficiency savings, compared with 58% for industry and 19% for transport; these are sector shares of overall efficiency savings, not building-retrofit project savings. Energy End-uses and Efficiency Indicators Data Explorer
The IEA estimated 9–30 jobs per US$1 million invested in building energy-efficiency measures in its sustainable-recovery analysis. The multiplier is an employment estimate whose result depends on local labor and investment conditions. Space heating
The JRC estimates that increasing renovation activity could raise construction-sector jobs by approximately 20% in a 2021 European Union scenario. That is a forecast impact estimate, not an observed employment count, and it depends on the renovation activity assumed by the scenario. Buildings Renovation: data supporting investment measures
Across these sources, the central measurement distinction is important: EU stock figures, IEA pathway milestones and JRC scenarios describe scale or modeled direction, while the DOE studies measure specific participant populations and one case-study building. Climate, building condition, occupancy, tariffs, measure package and baseline all affect outcomes, so these statistics do not establish a universal retrofit payback or a single global renovation rate.