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Newly built apartments are usually more energy efficient in operation than older apartments, because modern building codes generally require better insulation, windows, airtightness and building services. But age alone cannot tell you which apartment uses less energy: renovations, heating systems, floor area, shared amenities and how residents use the home can narrow or reverse the difference. For a fair comparison, look at weather-adjusted delivered energy per square metre and check what the figure includes.
Why are new-build apartments usually more energy efficient?
New apartments are typically designed under more recent energy-performance rules. Those rules can push construction toward a better-insulated envelope, more efficient windows, fewer uncontrolled air leaks and more efficient building services. Together, these features can reduce the energy needed to keep indoor spaces comfortable and provide hot water.
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The broad pattern appears in evidence from several places, though the results are not interchangeable. A 2025 study of Swedish multi-apartment buildings found that specific energy use generally declined as construction year increased. Its estimated efficiency gains were 1.57% per year for district-heated buildings and 1.09% per year for electrically heated buildings. A nationwide analysis of Germany’s apartment market also found higher energy-performance levels in newly constructed apartments, associated with stricter standards. These findings support a general tendency, not a guarantee about any two particular homes. The Swedish study and the German analysis cover different housing stocks and methods.
Building rules matter because they shape what a new project must achieve when it is designed and built. In the Swedish study, a 2006 change to performance-based building requirements was associated with estimated efficiency improvements of 14.2% for district-heated buildings and 9.7% for electrically heated buildings. Those are estimates for the Swedish context, not a prediction for a new apartment in another country or a direct measure of the savings a resident will see on a bill. The study describes its findings and the limits of comparing buildings of different ages.
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Does a newer apartment always use less energy than an older one?
No. An apartment’s age is a useful clue, but it is not a substitute for its energy records, systems and renovation history. A well-upgraded older apartment may perform as well as, or better than, a less efficient new one under the conditions that matter to a particular resident.
Renovations make age comparisons especially tricky. Older buildings may have had windows, walls or other parts of their energy systems improved after construction. The Swedish researchers specifically caution that a direct comparison between old and new buildings may not fairly measure the effect of code changes. They also found that Swedish district-heated buildings constructed from 2000 to 2005 had energy use similar to buildings from the 1980s—an example of why a simple “newer is better” rule can fail. Permit dates and actual completion dates can also complicate the assignment of a building to a construction-year group. The authors discuss these comparison problems.
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Energy use also depends on what a building contains and how it is occupied. Seattle’s municipal multifamily analysis notes that newer windows and insulation may improve efficiency, while newer apartments may also have more in-unit washers and dryers and larger or more extensive common areas. Those amenities can add energy demand. The report found a flat trend by building age in its data, but says the pattern needs that context; it should not be read as proof that age never matters or that all new buildings use the same amount of energy. The Seattle report covers nearly 1,500 multifamily buildings.
Other differences can be just as important as age: whether heating is electric or district-supplied, whether cooling is used, how hot water is produced, how much floor area is conditioned, and whether a measurement includes shared services. A smaller older apartment could use less total energy than a larger new apartment simply because there is less space to heat. That does not necessarily mean it has better energy performance per square metre.
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What is a fair way to compare two apartments?
Compare like with like: use delivered energy per square metre per year, check whether figures are measured or modeled, and confirm that the buildings have similar boundaries and included uses. A certificate rating can help, but utility records and system details add important context.
- Get the energy figure and its source. Ask for the apartment building’s energy-performance certificate (EPC) or local equivalent, plus utility history if it is available. Note whether each number comes from bills, an assessment or a design model. Do not treat unlike sources as if they were the same measurement.
- Put the values on a common basis. Where possible, compare delivered or final energy in kWh/m²/year. Check that the floor-area definition is consistent. A total annual bill in kWh is not directly comparable between homes of different sizes.
- Check weather treatment. Heating demand changes with the weather. Prefer weather-normalized figures when available; otherwise, a cold period in one building’s records and a mild period in the other can distort the comparison.
- Record the heating and cooling systems. Find out whether heat comes from district heating, electricity or another source, and whether the figure includes cooling. Energy use and cost are not the same: fuel and tariff differences can change what a given quantity of delivered energy costs.
- Ask how hot water and ventilation work. Check whether domestic hot water is included, how it is supplied, and whether the energy figure covers ventilation or other building services. The Swedish study’s EPC method included heating, hot water, comfort cooling and property electricity, but excluded appliance and user-equipment electricity. Another certificate may have a different scope. The Swedish study explains its EPC boundary.
- Separate apartment loads from shared-building loads. Ask whether common-area lighting, lifts, laundry rooms or other shared services are included in the reported figure, and whether the result has been allocated across apartments. This matters particularly when comparing a building with extensive common areas to a simpler one.
- Check who and what the figure represents. Occupancy, indoor temperatures, window airing and real-use patterns affect consumption. A design target may assume different conditions than a lived-in apartment’s utility record.
- Establish the building’s history. Request construction and major retrofit dates, as well as information on insulation, windows, heating equipment and ventilation upgrades. A recent retrofit can make the construction year a poor guide to current performance.
Keep a comparison sheet with one row per apartment and columns for energy use, area, period, weather adjustment, heating fuel and system, hot water, cooling, ventilation, common-area treatment, occupancy assumptions, measurement type and retrofit history. If a seller or landlord cannot provide a detail, mark it as unknown rather than assuming it is equal. The result may be a more honest comparison than a single rating number.
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How reliable is an EPC or energy rating?
An EPC is useful evidence, but it is not a promise about a resident’s future bills. Its value depends on what it measures, whether it is modeled or based on actual use, and how closely its assumptions match the apartment’s occupants and operating conditions.
The distinction between modeled and measured figures can be material. In the Swedish EPC dataset, estimated values averaged 18.15 kWh/m²/year lower than measured values for district-heated buildings and 10.61 kWh/m²/year lower for electrically heated buildings. Those averages describe that dataset; they are not a universal correction to apply to every EPC. The study also makes clear that the certificate’s boundary matters: it includes specified building energy uses, not all electricity a resident might consume through appliances or other equipment. See the Swedish study for its measured-versus-estimated comparison and method.
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Actual consumption can also diverge from a design target after an apartment is occupied. In a case study of an older apartment building renovated to meet minimum new-apartment performance requirements, measured heating use was 1.6 times the design estimate and domestic-hot-water use was 4.4 times the estimate. The reported reasons included indoor temperature, window airing, ventilation airflow, real-use profiles and system performance. The building met the minimum requirements for new apartments but missed the nearly-zero-energy target. This is one renovation case, not a typical multiplier for all buildings; its lesson is that a modeled target and a bill answer different questions. The case study reports its design and measured results.
For a renter or buyer, use the rating to understand a building’s assessed performance and use bills to understand past consumption, while remembering that past residents may have used the home differently. For a construction or retrofit decision, compare the design assumptions with the intended use and verify which systems and loads are within the modeled boundary.
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It can reach the minimum performance level expected of new apartments, according to the documented renovation case, although matching a more ambitious nearly-zero-energy target may require additional work. The result depends on the building’s starting condition, the measures chosen and how the upgraded systems perform in use.
Examples of retrofit measures documented in the sources include insulation, replacement windows, electric heat pumps, solar and energy-recovery ventilation. These measures address different parts of a building’s energy use: the envelope, heating supply, on-site energy and ventilation. They are not a universal package, and the sources do not establish that every measure is suitable or cost-effective for every building. A project needs to account for its climate, existing construction, equipment and operating needs. An Associated Press report describes multifamily energy-upgrade work, while the renovated-apartment study illustrates the gap that can remain between design targets and operation.
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For an existing building, the practical first step is to identify where energy is going rather than selecting equipment by age alone. Compare available energy records with the heating, hot-water, envelope and ventilation systems, then have a qualified local professional assess which upgrades fit the building. Any decision should distinguish energy savings from other goals such as comfort, reliability, affordability and emissions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does lower energy use mean lower environmental impact?
Not necessarily in every sense. This comparison concerns operational energy—the energy used while the apartment is occupied. It does not by itself determine the emissions associated with producing construction materials, building the property or completing a retrofit. The evidence here does not establish a universal lifecycle-carbon winner between new and older apartments.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsOperational energy is still an important part of the decision, but it should be discussed separately from embodied carbon. If environmental impact is the main concern, a reader needs information about both operating energy and construction or renovation impacts, and should avoid treating an EPC as a complete carbon assessment.
What should you conclude when the records are incomplete?
If two apartments have no comparable, weather-adjusted energy figures, treat the age comparison as a starting hypothesis rather than a verdict. A newer building is more likely to benefit from modern standards on average, but a recent retrofit, different heating source, larger floor area or different amenity load may explain more about its actual consumption than its construction date.
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Ask for the missing documents and system details before drawing a firm conclusion: the certificate and its scope, utility records, area, heating and hot-water equipment, ventilation, common-area treatment and dates of major upgrades. If only a modeled rating is available, say that it describes assessed or design performance, not a guaranteed bill. If only bills are available, check the period and occupancy context. The more of those conditions you can align, the more useful the comparison becomes.
Frequently Asked Questions
Can I compare apartment EPC ratings from different countries directly?
Not safely without checking each certificate’s calculation method, energy boundary and rating scale. The studies cited here use different national contexts, so a Swedish energy-use result or a German market finding should not be treated as a direct conversion for an apartment elsewhere.
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Does an EPC include electricity used by a tenant’s appliances?
Not always. The Swedish study’s EPC method included heating, hot water, comfort cooling and property electricity, but excluded appliance and user-equipment electricity; check the scope stated on the specific certificate.
Is a building’s energy rating the same as its carbon rating?
No. Energy use is one input to operational emissions, but an energy rating alone does not account for every emissions factor or for embodied carbon from construction and renovation.
