1. Two energy certificates
Estonia has two certificates, referred to by the same word in everyday speech although they measure different things. Their underlying data differ.
| Certificate | Prepared for | Basis | Validity |
|---|---|---|---|
| ETA, the energy performance value | new and substantially reconstructed buildings | calculation | 2 years from the occupancy permit |
| KEK, weighted specific energy use | existing buildings | actual consumption data | 10 years |
The difference in validity is fivefold, reflecting their different nature: a calculation has to be renewed, a measurement ages more slowly. The most important consequence concerns expectations: the calculated certificate does not predict bills, and it was never intended to.
2. Classes and required levels
An energy class is not a description but a requirement. A new building has a mandatory level, a substantially reconstructed one a separate and lower level.
The requirement operates on two levels: the lower level must be achieved without renewable energy, the higher one with it. This produces a constraint that changes the logic of the whole design: solar panels cannot compensate for poorly insulated external envelopes, because the first level is checked before they are taken into account.
3. What changed on 1 June 2025
Three changes entered into force on the same date, and their combined effect is greater than any one of them alone. They must be read together.
| Change | Consequence |
|---|---|
| The A to H scale was replaced by A to G | a class letter no longer means the same thing |
| Limit values and calculation methodology changed | earlier experience is a source of risk |
| The five-year transition ended: the nearly zero-energy requirement extended to houses of up to 220 m² heated area | affects most houses built in Estonia |
One rule follows from the first row and applies to every older document: classes from certificates issued at different times cannot be compared directly, and the date of the certificate must be checked before its class is interpreted. The third row has the widest reach, because it brings the highest requirement into an ordinary house project.
4. Design and calculation
Early decisions determine the energy demand, later decisions only the efficiency with which it is met. A small demand is easy to cover, and a large demand cannot be made small by an efficient device.
The Estonian particularity here is geometric: the orientation and shading of the roof affect not only the solution but which requirement applies at all. That is why assessing the roof belongs in the first design phase rather than alongside the choice of equipment.
5. Zero-emission buildings
A nearly zero-energy building is not the end point. Directive 2024/1275 sets the goal of a climate-neutral building stock by 2050, with intermediate deadlines along the way.
A zero-emission building is not a building that consumes no energy. The requirement is balance-based, but one condition is absolute: on-site combustion of fossil fuels is excluded. That condition cannot be compensated for, which makes it affect the choice of heating solution earlier than any numerical limit value.
6. Why this guide does not state figures
This is a deliberate choice, and the reason is worth stating, because it is a risk assessment rather than caution. Limit values are not repeated here.
The limit values for the energy performance value changed on 1 June 2025 and depend on the intended use of the building and, for houses, on the heated area. A wrong limit value is directly harmful here, because obtaining the building permit depends on it, not merely the quality of the solution.
It is more useful to know which level applies than to try to memorise figures: the hierarchy of levels is more stable than the values attached to it. Every limit value must be taken from the annex to the regulation in force.
7. Five rules that follow from the above
Fix the application date first, because it determines the applicable version, and 1 June 2025 is the watershed here. Everything else follows from it.
Take every limit value from the annex to the regulation in force, not from an earlier project, because the values changed together with the methodology. Older values age quickly.
Assess the orientation and shading of the roof in the first design phase, because they may determine which requirement applies, not only the solution. They are not changed later.
Commission the calculation early enough for it to influence the solution rather than merely evidence compliance; a calculation ordered late is a report, not a design tool. Late calculation only records the outcome.
Look at the date of a certificate before interpreting its class, because the scale and the methodology have changed and the same letter means different things. The same letter does not mean the same thing across years.
What this guide does not cover
Construction cost and the building permit procedure are covered in separate guides, as are public procurement, budgeting and renovation. This guide is confined to energy performance requirements and certificates.
Summary
Energy performance is a condition of the permit procedure in Estonia: without an energy performance value meeting the requirements, a new building does not obtain a building permit. There are two certificates, the calculated ETA valid for two years and the KEK based on actual data valid for ten, and the first does not predict bills. The requirement is two-level, and the lower level must be achieved without renewable energy, so solar panels do not compensate for the envelope.
On 1 June 2025 the A to H scale was replaced by A to G, the limit values and methodology changed, and the nearly zero-energy requirement extended to houses of up to 220 square metres heated area. Directive 2024/1275 sets the goal of a climate-neutral building stock by 2050, and for a zero-emission building on-site combustion of fossil fuels is excluded.
This guide offers professional orientation as at the date of verification. It replaces neither the regulation in force nor the assessment of a competent specialist.