Understanding the energy certificate: duties for owners & sellers

Anyone selling or newly letting must present a valid energy certificate (§ 80 GEG). Failing to do so risks fines of up to €10,000. At the same time: the certificate is a comparison tool — not a heating-cost guarantee and no substitute for a building survey.

On a property sale the energy certificate is among the documents you must not forget — and one that is nonetheless regularly sourced too late. Yet the matter is clearly regulated.

This guide explains the two certificate types, walks you step by step through your duties, names the exceptions — and puts into perspective what the document actually says. At the end you will find 7 concrete tips and an outlook on the upcoming 2026 EU reform.

What is an energy certificate — and what is it for?

The energy certificate is a nationally standardised document that rates a building's energy efficiency. The legal basis is the Building Energy Act (GEG), which replaced the previous EnEV in November 2020.

Similar to the energy label on household appliances, it shows on a colour scale from A+ (very efficient, green) to H (very inefficient, red) how much energy a building uses for heating, hot water and ventilation. The central metric is given in kilowatt-hours per square metre per year (kWh/m²·a). Rule of thumb: values under 100 are still in the green zone.

The purpose is transparency: buyers and prospective tenants should be able to form a picture of the energy state and expected running costs before making a decision.

Demand vs. consumption certificate: the decisive difference

There are two variants that differ fundamentally in how the metrics are derived.

Consumption certificate (§ 82 GEG)

Based on the actual energy consumption of the last three years (from heating bills). Cheaper (about €50–€150) but with a decisive catch: the value depends on the heating behaviour of the previous users. A frugal family and a heavy heater produce entirely different values for the same house.

Demand certificate (§ 81 GEG)

Based on a building-physics calculation of envelope, insulation and heating under standardised conditions. It is independent of user behaviour and therefore more objective and meaningful — but more elaborate and expensive (about €300–€600, up to €1,000 for very old buildings with patchy documentation). An on-site visit is usually needed.

Your duties as owner & seller — step by step

The presentation duty flows from § 80 GEG. It kicks in at three stages — well before the notary appointment.

1. In the property listing

As soon as an energy certificate exists and you advertise commercially (e.g. on ImmoScout24, Immowelt or in the newspaper), the ad must contain:

• Type of certificate (demand or consumption)
• Final energy demand or consumption in kWh/(m²·a)
• Main energy carrier / type of heating
• Year of construction
• Energy efficiency class (A+ to H)

2. At the viewing

The certificate must be presented to interested parties unprompted — you do not have to be asked. For purely written enquiries without a viewing, it is enough to state the mandatory information in the correspondence.

3. On conclusion of the contract

At the latest when the purchase or tenancy contract is concluded, the certificate must be handed to the buyer or new tenant as a copy or original.

Validity: every certificate is valid for 10 years from issue and cannot be extended — a new one must be produced after that. Certificates under the old EnEV remain valid until their expiry date.

Who does not need an energy certificate? (Exceptions)

An energy certificate is not always required. Exempt (among others under § 79 (4) GEG):

• Owner-occupiers without a transaction — anyone occupying their own property and neither selling nor re-letting.
• Existing tenancies — for ongoing tenancies without new letting.
• Listed buildings — for monuments the rules do not apply or apply only in a limited way.
• Very small buildings with less than 50 m² of usable area.

Good to know: in owners' communities (WEG), owners have a right on sale or letting to receive the certificate in time from the community, which bears the cost. And: landlords may not pass on the cost of the certificate to tenants.

Who may issue an energy certificate?

Under § 88 GEG, only qualified professionals may issue certificates — such as architects, civil engineers, certain physicists and master craftsmen with the relevant additional qualification. You can find issuers in the dena issuer database or on the federal energy-efficiency expert list.

Beware of cheap offers: pure online certificates without an on-site visit are permitted but carry the risk of inaccurate or false statements. Consumer advocates explicitly warn against dumping offers under €70. Anyone who also wants to use the certificate for KfW or BAFA funding should only commission experts from the official energy-efficiency expert list.

What the certificate says — and what it does not

Here lies the biggest misconception. The certificate is useful but limited.

In short: the certificate is a standardised comparison yardstick to rank assets roughly — not a precise measuring device for a specific flat.

Why a good energy certificate pays off

The efficiency class has long been more than a formality. Tenants and buyers increasingly pay attention because it allows direct conclusions on heating costs. The difference is substantial: green-class properties, according to specialists, incur around €15 to €20 less energy cost per square metre per year than poorly insulated buildings — on a 90 m² flat that is around €1,500 annually.

For you as an owner: a good certificate can raise value and rentability and is a strong sales argument. And if the value is poor, especially the demand certificate provides a robust basis to think about refurbishment measures and funding (KfW/BAFA).

Outlook: what changes in 2026 (EU reform)

In the wake of the revised EU Buildings Directive (EPBD), a reform of the German rules is under way. In mid-May 2026 the federal cabinet approved the draft of the Building Modernisation Act (GModG), which is set to partially replace the GEG. Final entry into force is expected in summer 2026.

Planned changes include a free choice between demand and consumption certificates for all existing residential buildings, plus stricter requirements on consumption data. Major renovations should also trigger a certificate in future. As the act is not yet final, check the current status before every transaction — the core GEG duties described here remain applicable until then.

7 tips for owners & sellers

1. Get it early. Sort the certificate before you list — not just before the notary appointment.
2. Choose the right type. If a consumption certificate is legally sufficient, it is the cheaper solution. If refurbishment or funding is planned, take the demand certificate.
3. Commission a qualified issuer. Use the dena or federal expert list. Steer clear of dumping online certificates under €70.
4. All mandatory data in the ad. Type, final energy value, energy carrier, year and efficiency class — gaps are fineable.
5. Present and hand over. Show unprompted at the viewing, hand over as copy or original at the latest at contract conclusion.
6. Check validity. A certificate is valid only 10 years — check the issue date before using it.
7. Use it as a marketing instrument. A good value is a sales argument — communicate it actively. For poor values, modernisation recommendations and a refurbishment roadmap help.

Conclusion

On sale and new letting the energy certificate is mandatory — sourced in time, correctly stated in the ad, presented unprompted at the viewing and handed over on contract conclusion. Anyone following these four steps is on the safe side and avoids fines of up to €10,000.

At the same time, the sober view remains: the certificate is a comparison tool, not a cost promise and no substitute for a proper building survey. For buyers and sellers alike — as with any property question — the numbers in the certificate are an important but not the only building block of a good decision.

Frequently asked questions (FAQ)

Is an energy certificate mandatory on sale?

Yes. On sale, new letting or lease a valid certificate must be presented (§ 80 GEG). It is to be shown unprompted at the viewing and handed over at the latest on conclusion of the contract.

Demand or consumption — which do I need?

For residential buildings with fewer than 5 units and a permit before 1,11,1977, the demand certificate is usually mandatory. Otherwise you have a free choice. For refurbishment plans or funding applications the demand certificate is the better choice.

How long is an energy certificate valid?

10 years from the issue date. After that it is invalid and cannot be extended.

What does an energy certificate cost?

A consumption certificate is about €50–€150, a demand certificate with on-site visit around €300–€600 (more for difficult old buildings).

What is the penalty without an energy certificate?

A missing, invalid or incomplete certificate is an administrative offence and can be fined up to €10,000.

Does a listed property need an energy certificate?

No — for monuments the certificate rules do not apply or only in a limited way (§ 79 (4) GEG).

FAIV: cleanly sold, correctly presented

The energy certificate is one of many points at which a professionally supported sale makes the difference: legally clean, transparent and with the energetic state as an honest selling point. FAIV Real Estate supports owners in presenting their property correctly and effectively — reach out to us when planning a sale or letting.

Note: this article is general editorial information and does not constitute legal advice. The wording of the Building Energy Act (GEG) in its current form is decisive. Due to the ongoing reform (EPBD / planned Building Modernisation Act), requirements may change in 2026. For specific legal questions we recommend consulting a specialist lawyer for real-estate law or a qualified energy consultancy.