KfW 261 explained — funding for renovation to Effizienzhaus standard

Updated: May 2026 — the key facts in 60 seconds

KfW 261 funds the comprehensive energy-related renovation of residential buildings to Effizienzhaus 85, 70, 55 or 40. The programme combines a subsidised loan with a repayment subsidy (Tilgungszuschuss). The application must be submitted before any measures are commissioned via the house bank (Hausbank — German commercial bank handling the loan). It is mandatory that an energy-efficiency expert listed on the dena expert list for federal funding accompanies the process. The repayment subsidy increases with the efficiency standard achieved and with fulfilment of the EE-Klasse (renewable energy class) and NH-Klasse (sustainability class) — the exact rates vary and change periodically, so we calculate them project-specifically in the initial consultation.

What is KfW 261?

KfW 261 is the central federal programme for the energy-related renovation of residential buildings within the framework of the Federal Funding for Efficient Buildings (BEG). It is aimed at owners who want to lift their residential building — single-family or multi-family, owner-occupied or rented — to a recognised Effizienzhaus standard through a complete renovation.

Unlike individual-measure funding (BEG EM, e.g. for heating or insulation as a standalone project), KfW 261 funds the overall project. That means: building envelope, building services / technical building equipment and efficiency planning are thought of as a coherent concept and funded in a single application.

The funding consists of two components: a subsidised loan with a long term and a repayment subsidy (Tilgungszuschuss), which does not have to be repaid. The repayment subsidy is paid out after successful implementation and confirmation after completion (BnD — Bestätigung nach Durchführung) by the accompanying energy-efficiency expert.

Important: KfW 261 is not intended for new builds — the programme KfW 297/298 “Climate-Friendly New Construction” applies for new buildings. Pure individual measures without an Effizienzhaus target standard also run via other funding paths, namely BEG EM (BAFA for technical building equipment, KfW 262 for individual measures on the residential building).

At enbe, we accompany the entire application process — from the BzA (Bestätigung zum Antrag — confirmation of application) through construction supervision to the BnD (Bestätigung nach Durchführung — confirmation after completion). This ensures that all technical evidence is in order and that the repayment subsidy is ultimately disbursed.

Which Effizienzhaus standards are there?

Within KfW 261, four Effizienzhaus standards are eligible for funding: Effizienzhaus 85, 70, 55 and 40. The number indicates the maximum primary energy demand as a percentage of the notional reference building under the German Building Energy Act (GEG). An Effizienzhaus 55 therefore consumes — on paper — only 55 % of the primary energy of a comparable reference building.

The lower the number, the higher the efficiency standard, and the higher the repayment subsidy. At the same time, the structural requirements rise considerably. While Effizienzhaus 85 is often achievable with solid envelope insulation and an efficient heating system, Effizienzhaus 40 generally requires very high-quality insulation, excellent windows, a heat pump or district heating connection as well as a ventilation system with heat recovery.

In addition to the basic standards, there are two class bonuses that can increase the repayment subsidy further:

• EE-Klasse (renewable energy class): Achieved when at least 65 % of the heating energy demand is covered by renewable energies. In practice this generally means: heat pump, biomass, solar thermal, a recognised district heating network or a combination thereof.
• NH-Klasse (sustainability class): Achieved through certification under the QNG (Qualitätssiegel Nachhaltiges Gebäude — Quality Seal for Sustainable Buildings). This includes life-cycle assessment, pollutant-free building materials, water management and much more — a significantly more elaborate proof.

The repayment subsidy increases with the Effizienzhaus standard and the fulfilment of the EE-/NH classes. We calculate individually in each project which level is economically reasonable to reach — because the additional costs for each step up (e.g. Effizienzhaus 70 to Effizienzhaus 55) vary greatly and depend strongly on the building’s initial condition.

Which measures are eligible for funding?

All measures necessary to achieve the Effizienzhaus standard are eligible. They can be grouped into three categories:

1. Measures on the building envelope - Insulation of the external walls (interior or exterior) - Insulation of the roof or the top-storey ceiling - Insulation of the basement ceiling or earth-contact components - Replacement of windows and exterior doors - Summer heat protection (e.g. external shading)

2. Building services / technical building equipment - Heating replacement with heat pump, biomass, fuel cell or district heating connection - Solar thermal for heating support or hot water preparation - Ventilation systems with heat recovery - Optimisation of hot water preparation - Hydraulic balancing and pump replacement as part of the overall concept

3. Efficiency planning and construction supervision The costs for the energy-efficiency expert (BzA, BnD, construction-accompanying quality assurance) are themselves eligible for funding — often as an additional grant. This means that qualified support is economically almost always worthwhile. More on this under [KfW construction supervision](/kfw-baubegleitung).

Not eligible are purely cosmetic renovations, furniture, outdoor facilities without an energy-related connection, or DIY labour on the construction site (the material itself can be partly eligible, but self-performed labour is not).

The application path in 6 steps

1. Initial consultation with an energy-efficiency expert. At enbe, we work with you to clarify the realistic target level (Effizienzhaus 85, 70, 55 or 40), assess the initial condition and outline the likely packages of measures.

2. Energy calculation and renovation concept. Based on a detailed survey of the building, the energy calculation is drawn up. It forms the basis for the choice of measures and for the funding forecast.

3. Confirmation of application (BzA). The energy-efficiency expert prepares the official BzA. Only with this document can the funding application be submitted.

4. KfW application via the house bank. The application is not lodged directly with KfW but via an on-lending bank (Sparkasse, Volksbank, commercial bank). Important: the application must be submitted before any measures are commissioned — commissioning before submission is a knock-out criterion and leads to loss of eligibility.

5. Implementation with construction supervision. During implementation, the energy-efficiency expert assumes construction-accompanying quality assurance — that is, checks whether the planned energy standards are actually met.

6. Confirmation after completion (BnD) and funding drawdown. Once all measures are completed, the BnD is prepared. With it, the repayment subsidy is drawn down at the house bank and offset against the loan.

Local block Munich & Upper Bavaria: For properties in Munich, KfW 261 can — based on our experience — be combined with the climate protection funding programme (FKG) of the City of Munich. There are also municipal top-ups in the district of Starnberg, in the Tölzer Land and in some municipalities of the Five Lakes region. Our [funding strategy](/foerderberatung) checks the combinations for every project.

Common pitfalls

Even though KfW 261 is clearly structured, there are a few typical stumbling blocks that come up again and again in practice:

1. Commissioning before application. The most common and most expensive mistake. Anyone who has already commissioned tradespeople before the KfW application is approved loses eligibility. “Commissioning” means: signed contract, not just a quotation. A planning service with commissioning of the energy-efficiency expert is exempt from this.

2. Wrong assumption about EE-Klasse or NH-Klasse. Anyone planning with the expectation of achieving the EE-Klasse but then failing to meet all requirements loses the corresponding bonus. This must be calculated conservatively from the outset.

3. Standalone heating measure instead of complete renovation. Anyone who really only wants to replace the heating should check BEG EM (BAFA for heating) — not KfW 261. The funding logic is different, and for pure standalone heating projects BAFA is often more economical.

4. Energy-efficiency expert not on the dena expert list. Only experts listed for federal funding may issue the BzA and BnD. Without a listing the funding cannot be obtained — Marc Strassner is listed on the dena expert list for federal funding.

5. iSFP bonus not factored in. Anyone who has an [individual renovation roadmap (iSFP)](/sanierungsfahrplan) drawn up before the renovation typically receives an additional bonus on follow-up individual measures from BEG EM. Even if KfW 261 is chosen as a complete renovation, the iSFP is often worthwhile as a strategic tool.

When is KfW 261 worthwhile?

KfW 261 is worthwhile above all in three constellations:

Complete renovation with high depth of intervention. Anyone insulating the envelope comprehensively and replacing the heating at the same time generally comes out — experience shows — more favourably with the combined funding effect of KfW 261 than with the sum of individual-measure subsidies.

Heating replacement plus envelope as a linked project. Anyone touching envelope and building services anyway should check the Effizienzhaus balance — the jump from “individual measures” to “Effizienzhaus” is often smaller than expected.

Purchase of an existing property with a renovation plan. When ownership changes, KfW 261 is an established vehicle for financing the modernisations that are needed anyway under attractive conditions. A [pre-purchase consultation](/vor-kauf-beratung) is also worthwhile here to assess the energy-related potentials.

KfW 261 is less useful when only a single measure is planned. For the heating alone, BEG EM (BAFA) is usually more efficient. For pure window replacement without an overall concept, KfW 262 is the better fit.

What does KfW 261 offer compared with § 35c EStG (German tax bonus for energy renovations)?

A frequent question: should I take the KfW funding or the § 35c EStG (German tax bonus for energy renovations)? Both at once is not possible — it is an either/or choice.

KfW 261 delivers direct funding via a repayment subsidy plus a low-interest loan. The money therefore actually flows into the account or is offset against the loan.

§ 35c EStG is a tax deductibility of the renovation costs over three years. Anyone with high taxable income can — experience suggests — benefit noticeably here; anyone paying little tax tends to benefit less. Tax advantages are possible; the concrete impact depends strongly on the individual tax situation.

In practice, KfW 261 tends — experience shows — to be stronger for expensive, comprehensive renovation projects, because the repayment subsidy unfolds the greatest effect there in absolute terms. The tax bonus is more suitable for smaller, staggered projects — and for owners who want to avoid the bureaucratic effort of the KfW application.

FAQ in brief

Do I absolutely need an iSFP for KfW 261? No, an iSFP is not mandatory for KfW 261 itself. It is nevertheless often useful as a strategic tool — and it secures the iSFP bonus for any individual measures outside the complete renovation.

How high is the repayment subsidy at the moment? The repayment subsidy varies depending on the Effizienzhaus standard achieved and the fulfilment of the EE-/NH classes. The exact rates change with KfW’s programme logic — we calculate them currently and transparently for your project.

Can I combine KfW 261 with BAFA EBN (Energieberatung Wohngebäude)? A direct combination of KfW 261 + BAFA EBN (Energieberatung Wohngebäude) for the same measure is not possible. However, BAFA EBN can be used upstream for the initial energy consultation, with implementation then running through KfW 261. We examine the combination options in the [funding strategy](/foerderberatung).

How long does the application process take? From the initial consultation to approval of the application, 6 to 12 weeks are typically realistic — depending on complexity, bank process and completeness of the documents. We coordinate the process closely with you.

What happens if I miss the target standard? If the BnD ultimately shows that the targeted Effizienzhaus standard has not been reached, this can result in a downgrade or, in the worst case, the loss of the repayment subsidy. This is precisely why construction-accompanying quality assurance is so important — we intervene early when deviations become apparent.

Next step

Are you considering renovating your residential building in the Munich area or Upper Bavaria to Effizienzhaus standard? In a free 20-minute initial consultation, we will clarify the realistic target level and the likely funding impact. More about our support: [KfW construction supervision](/kfw-baubegleitung) and [renovation roadmap](/sanierungsfahrplan). [Book an appointment](/kontakt) or call 089 / 215 484 720.