Was ist das QNG-Siegel?

QNG steht für „Qualitätssiegel Nachhaltiges Gebäude“. Es bestätigt, dass ein Gebäude ökologische, ökonomische und soziokulturelle Nachhaltigkeitsanforderungen erfüllt — unter anderem Grenzwerte für Treibhausgasemissionen über den Lebenszyklus. Das Siegel wird über akkreditierte Zertifizierungsstellen vergeben (Quelle: qng.info, Stand 2026).

Was bedeutet 'KfW 40 QNG'?

Der Ausdruck beschreibt ein Effizienzhaus 40, das zusätzlich das QNG-Siegel erhält. Genau diese Kombination ist Voraussetzung für die höhere KfW-Förderstufe (Programm 298 bzw. die höhere WEF-Stufe) mit bis zu 150.000 € je Wohneinheit statt 100.000 € (Quelle: kfw.de, Programm 298, Stand 2026). EH 40 beschreibt die Energieeffizienz, QNG die Nachhaltigkeit über den Lebenszyklus.

Was kostet die QNG-Zertifizierung?

Die Kosten setzen sich vor allem aus der Nachhaltigkeitsberatung und der eigentlichen Zertifizierung zusammen. Als Richtwert liegen sie im niedrigen fünfstelligen Bereich; die genaue Höhe hängt von Gebäude, Zertifizierungsstelle und Aufwand ab (Richtwert, Stand 2026). Diesen Kosten steht der um 50.000 € höhere Kreditrahmen der KFN-/WEF-Stufe mit QNG gegenüber.

Wer stellt das QNG-Siegel aus?

Ausgestellt wird das Siegel von akkreditierten Zertifizierungsstellen auf Basis eines anerkannten Bewertungssystems. Begleitet wird der Prozess in der Regel von einem Nachhaltigkeitsberater bzw. QNG-Nachhaltigkeitsexperten (Quelle: qng.info, Stand 2026).

Wann muss die QNG-Zertifizierung stehen?

Die Nachhaltigkeitsziele müssen von Beginn an eingeplant werden, damit Planung und Materialwahl passen. Der Nachweis wird im Förderprozess zu den vorgesehenen Zeitpunkten erbracht — die genauen Fristen richten sich nach dem KfW-Programm und dem Zertifizierungssystem (Quelle: kfw.de / qng.info, Stand 2026). Eine frühe Einbindung des Beraters vermeidet teure Nachbesserungen.

Ob sich QNG rechnet, hängt vom Verhältnis der Zusatzkosten (Beratung + Zertifizierung, Richtwert niedriger fünfstelliger Bereich) zum Vorteil des um 50.000 € höheren, zinsverbilligten Kreditrahmens ab. Bei vielen Neubauten überwiegt der Förderhebel, sofern das Gebäude die Anforderungen ohnehin weitgehend erfüllt (Richtwert, Stand 2026). Eine individuelle Rechnung sollte der Finanzierungs- und Energieberater aufstellen.

Quality Seal Sustainable Building

QNG Seal: Sustainability as subsidy lever

The QNG seal raises the KfW subsidy level from 100.000 € to 150.000 € per residential unit. Here you will find cost blocks, the process with sustainability consultant and the relationship to KfW 40.

To the KFN subsidy level with QNG

KfW 40 and QNG — how are they connected?

"KfW 40 QNG" describes an Efficiency House 40 that additionally receives the quality seal sustainable building. EH 40 stands for the energy efficiency (maximum 40 % primary energy demand of the reference building), QNG for the sustainability over the entire life cycle. Exactly this combination is a prerequisite for the higher KfW subsidy level — up to 150.000 € instead of 100.000 € per residential unit via KFN 298 or the higher WEF level (Source: kfw.de, Program 298, Stand 2026).

What the QNG Seal Confirms

The QNG seal evaluates a building holistically: ecological quality (among other things greenhouse gas emissions and resource use over the life cycle), economic quality (life cycle costs) as well as sociocultural and technical aspects. It is awarded by accredited certification bodies on the basis of a recognized evaluation system (Source: qng.info, Stand 2026). Unlike the pure Efficiency House standard, which focuses on operating energy, QNG considers the sustainability of the entire building.

Cost blocks of the certification (guide values)

The following details are explicitly guide values — the actual costs depend on the building, certification body and effort involved. In return, you have the 50.000 € higher, interest-subsidized credit line of the KFN/WEF level with QNG.

Cost block	Guide value	Note
Sustainability consulting	Guide value lower four-digit to low five-digit range	Planning, life cycle assessment and documentation over the life cycle
QNG certification	Guide value lower four-digit to low five-digit range	Inspection and seal issuance by accredited body

Guide values, Stand 2026. Further reading: QNG — Quality Seal Sustainable Building.

To the QNG seal in five steps

1
Incorporate sustainability consultant
Involve a QNG expert at an early stage — ideally before the detailed planning so that the material selection and life cycle assessment match.
2
Define objectives and evaluation system
Define target seal and certification system; incorporate greenhouse gas limit values over the life cycle.
3
Document planning and life cycle assessment
Prepare life cycle assessment, collect proofs and product data during the planning.
4
Accompany construction and secure proofs
During the construction phase, verify materials and execution to ensure that the requirements are met.
5
Complete the certification
Accredited body reviews the documents and issues the QNG seal — basis for the higher subsidy level.

How the QNG contributes to the higher KFN subsidy level is shown on the page KFN 297/298. Whether the additional effort is worthwhile for your project is assessed on the page Is KfW 40 worthwhile? .

Frequently asked questions on the QNG seal

Answers regarding meaning, costs, process and the relationship of QNG to KfW 40 — with source and Stand 2026.

What is the QNG seal?

QNG stands for "Quality Seal Sustainable Building". It confirms that a building fulfills ecological, economic and sociocultural sustainability requirements — among others limit values for greenhouse gas emissions over the life cycle. The seal is awarded via accredited certification bodies (Source: qng.info, Stand 2026).

What does 'KfW 40 QNG' mean?

The term describes an Efficiency House 40 that additionally receives the QNG seal. Exactly this combination is a prerequisite for the higher KfW subsidy level (program 298 or the higher WEF level) with up to 150.000 € per residential unit instead of 100.000 € (Source: kfw.de, program 298, Stand 2026). EH 40 describes the energy efficiency, QNG the sustainability over the life cycle.

What does the QNG certification cost?

The costs are primarily composed of the sustainability consulting and the actual certification. As a guide value they are in the low five-digit range; the exact amount depends on building, certification body and effort (guide value, Stand 2026). These costs are offset by the 50.000 € higher credit framework of the KFN/WEF level with QNG.

Who issues the QNG seal?

The seal is issued by accredited certification bodies on the basis of a recognized assessment system. The process is usually accompanied by a sustainability consultant or QNG sustainability expert (Source: qng.info, Stand 2026).

When must the QNG certification be completed?

The sustainability objectives must be planned in from the start so that planning and material selection fit. The verification is provided in the subsidy process at the scheduled times — the exact deadlines depend on the KfW program and the certification system (Source: kfw.de / qng.info, Stand 2026). Early involvement of the consultant avoids costly post-improvements.

Is QNG worthwhile?

Whether QNG pays off depends on the ratio of the additional costs (consulting + certification, guide value low five-digit range) to the benefit of the 50.000 € higher, interest-subsidized credit framework. For many new builds the subsidy lever predominates, provided the building largely meets the requirements anyway (guide value, Stand 2026). An individual calculation should be drawn up by the construction financing and energy consultant.

QNG Seal: Sustainability as subsidy lever

KfW 40 and QNG — how are they connected?

What the QNG Seal Confirms

Cost blocks of the certification (guide values)

To the QNG seal in five steps

Incorporate sustainability consultant

Define objectives and evaluation system

Document planning and life cycle assessment

Accompany construction and secure proofs

Complete the certification

Frequently asked questions on the QNG seal

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