Funding · as of 01/10/2026
For new windows and front doors, the federal government pays a grant of up to 15 percent. Here you can see which programmes exist, what you need to observe and what you might receive. Every figure names its source. The information applies to properties in Germany.
Which funding fits?
Choose the measure, enter the costs, and you will see an estimate. The result is not a commitment.
Programmes
The BEG grant is the core for most projects. A loan and tax relief supplement or replace it.
BAFA
15 % grant
Currently available. No legal entitlement; approval within the available budget.
BAFA: building envelopeKfW 358 / 359
up to €120,000 per unit
Fact sheet dated 09/2026, valid from 24 September 2026.
KfW fact sheet 358/359KfW 455-B / 455-E
currently no funds allocated
Funding status according to trade press, not confirmed by kfw.de. Check the status directly with KfW before any planning.
KfW fact sheet 455-BKfW 159
loan instead of grant
Programme status not conclusively verified by us.
kfw.de§ 35c EStG
20 % over 3 years
Statutory text, retrieved 01/10/2026.
§ 35c EStG§ 35a EStG
20 % of labour costs
Statutory text, retrieved 01/10/2026.
§ 35a EStGWhat is funded?
A patio roof itself is not eligible for funding. External shading on the building envelope may be.
| Measure | Limit value W/(m²K) | Note | BEG |
|---|---|---|---|
| Windows, balcony and patio doors | Uw ≤ 0.95 | Special value 1.1 for burglar-resistant or sound/fire-protection glazing | yes |
| Roof windows | Uw ≤ 1.0 | yes | |
| Front door and exterior doors of heated rooms | UD ≤ 1.3 | yes | |
| Roller shutter, venetian blind, external blind | DIN 4108-2 | Parallel to the glazing on the building envelope | under conditions |
| Awning, canopy, freestanding louvres | – | Expressly excluded | no |
| Patio roof, pergola, carport | – | Not a measure on the building envelope | no |
| Insect screen, garage door, fence | – | Not covered by the BEG | no |
Existing buildings are funded. According to BAFA, the building application or notification must date back at least five years. Minimum investment: €300 gross per measure.
Procedure
The expert inspects your building, confirms the measures and supports the application. Approved experts are listed in the portal “Energy efficiency experts for federal funding programmes” (Energie-Effizienz-Experten für Förderprogramme des Bundes). Advice and planning may take place before the application.
With the configurator you define windows, doors or sun protection. We prepare your quotation from it. What matters is proof of the thermal transmittance values for the delivered element.
The application must reach BAFA before an unconditional supply or service contract is concluded. The application includes a contract with a condition precedent or condition subsequent tied to the funding commitment.
The grant notice starts an approval period of 36 months. Only now is the order safe.
Installation is carried out by a specialist firm. Pay by bank transfer and keep invoices and proof of payment.
The expert confirms the minimum requirements and the eligible expenses. You submit the proof of use within six months of completion. BAFA then pays out.
Common mistakes
The most expensive mistake comes first: ordering before applying.
An unconditional contract before the application counts as the start of the project. The grant may then be forfeited. Use a contract with a condition precedent tied to the funding commitment.
For building envelope measures, an expert is mandatory. Without one, the application is not approved.
Windows with Uw above 0.95 or doors with UD above 1.3 are not eligible (special cases see table). Look at the value of the whole element, not only the Ug value of the glass.
Awnings, canopies and freestanding louvres are excluded. Sun protection parallel to the glazing on the building envelope is eligible.
For the same measure, the BEG grant and tax reduction must not be used together. Anyone who claims both must expect a repayment demand.
If the proof of use is submitted too late, the right to payout lapses.
FAQ
For measures on the building envelope, the federal funding for efficient buildings (BEG EM) pays 15 percent of eligible expenses as a grant. For a single-family home, at most €30,000 per calendar year is taken into account, giving a maximum of €4,500. With an individual renovation roadmap (iSFP), the cost limit rises to €60,000. Figures as of: 01/10/2026.
No. Since 21 July 2026, the bonus of 5 percentage points applies only to the share of costs above the normal limit of €30,000 per residential unit. An eligible investment of at least €30,000 gross is also required. For smaller projects the rate stays at 15 percent.
Before the project starts. As a rule, the start is the conclusion of the supply or service contract. A contract concluded under a condition precedent or condition subsequent tied to the funding commitment is permitted. Planning and advice may take place beforehand. Anyone who starts before approval does so at their own risk.
Yes. For measures on the building envelope an energy efficiency expert must be involved, as well as for the iSFP bonus. The expert prepares the application with you and, after installation, confirms the technical minimum requirements and the eligible expenses.
Windows, balcony and patio doors: Uw of at most 0.95 W/(m²K). Roof windows: Uw of at most 1.0. Exterior doors of heated rooms: UD of at most 1.3. For burglar-resistant windows and windows with special sound or fire-protection glazing, the guideline sets higher limit values; the expert checks this case by case.
Yes, if it serves as summer heat protection and sits parallel to the glazing on the thermal building envelope, for example a roller shutter or venetian blind. Awnings, canopies and freestanding louvres are expressly excluded.
No. Patio roofs and pergolas are not a measure on the building envelope within the meaning of the guideline. External shading on the building envelope may be eligible, but as a rule not for unheated extensions. The energy efficiency expert checks this case by case.
Not for the same measure. Anyone using BEG funding may claim neither § 35a nor § 35c EStG for that measure. For several different measures, a split is possible. Have this clarified with your tax adviser.
Yes, all owners are entitled to apply, including companies and homeowner associations. The tax reductions under § 35a and § 35c, however, apply to owner-occupied flats and houses.
No. Approval is granted within the available budget at the authority's due discretion. The guideline states this expressly.
After installation and after the proof of use has been reviewed. You submit the proof within six months of completing the project. The approval period is 36 months from receipt of the notice. We cannot promise a fixed processing time.
Figures and sources
Retrieved on 01/10/2026. The label shows whether the figure comes from the guideline, the law or the fact sheet itself, or from the trade press.
| Figure | Value | Source | As of |
|---|---|---|---|
| Building envelope grant | 15 % of eligible expenses | BEG EM funding guideline, no. 8.4.1 letter a | in force since 21 July 2026 |
| Cost limit per residential unit and calendar year | €30,000 (1st unit), €15,000 each (2nd to 6th unit), €8,000 each from the 7th unit; with iSFP €60,000 / 30,000 / 15,000 | BEG EM funding guideline, no. 8.3.1 letter a | in force since 21 July 2026 |
| iSFP bonus | +5 percentage points, only on the share of costs above the base limit; minimum investment €30,000 gross; iSFP must be available when applying | BEG EM funding guideline, no. 8.4.2 | in force since 21 July 2026 (previously the bonus applied to all costs) |
| Minimum investment | €300 gross per individual measure | BEG EM funding guideline, no. 4 | in force since 21 July 2026 |
| Windows, balcony and patio doors | Uw of at most 0.95 W/(m²K); with special glazing (sound, fire) or burglar-resistant 1.1 | BEG EM, annex technical minimum requirements, no. 1.1 | in force since 21 July 2026 |
| Roof windows, exterior doors | Uw of at most 1.0 W/(m²K); exterior doors of heated rooms UD of at most 1.3 W/(m²K) | BEG EM, annex technical minimum requirements, no. 1.1 | in force since 21 July 2026 |
| External sun protection | Eligible as summer heat protection, parallel to the glazing on the building envelope (DIN 4108-2, table 7 rows 3.1 to 3.3). Awnings, canopies and freestanding louvres are excluded. | BEG EM, no. 5.1 letter c and annex no. 1.2.2 | in force since 21 July 2026 |
| Application before project start | Application before the project starts; when applying, a supply or service contract with a condition subsequent or condition precedent tied to the funding commitment must be available | BEG EM funding guideline, no. 9.2.1 | in force since 21 July 2026 |
| Energy efficiency expert | An energy efficiency expert must be involved for building envelope measures and for the iSFP bonus | BEG EM funding guideline, no. 9.3 | in force since 21 July 2026 |
| Approval period and proof | 36 months from receipt of the notice; proof of use within six months of completing the project; payout after review | BEG EM funding guideline, no. 9.4.1 and 9.5.1 | in force since 21 July 2026 |
| No double claim with tax reduction | No accumulation with § 35a or § 35c EStG for the same measure | BEG EM funding guideline, no. 8.6 | in force since 21 July 2026 |
| KfW supplementary loan 358/359 | Up to €120,000 per residential unit, up to 100 % of eligible costs; only in addition to a BAFA or KfW grant commitment already issued (not older than 12 months). 358 for owner-occupiers with household income up to €90,000. | KfW loan fact sheet 358/359 | dated 09/2026, valid from 24 September 2026 |
| KfW 455-B barrier reduction (grant) | 10 % of costs up to €25,000 per residential unit. New applications were most recently no longer possible because the funds were exhausted. Windows and French doors are not funded here, only under the BEG. | KfW fact sheet 455-B (as of 04/2026); funding status according to trade press (energie-fachberater.de), not confirmed by kfw.de Trade press | fact sheet 04/2026; funding status end of July 2026 |
| KfW 455-E burglary protection (grant) | According to trade press, without budget funds since the end of 2023, no resumption announced. Not confirmed by kfw.de: check there before any planning. | Trade press (including lupus-electronics.de); KfW page was not accessible Trade press | retrieved 1 October 2026 |
| KfW 159 age-appropriate conversion (loan) | Low-interest loan, also for burglary protection and barrier reduction. Please check terms and maximum amount directly with KfW. | Trade press; programme at kfw.de Trade press | not conclusively verified |
| § 35a EStG tradesperson services | 20 % of labour costs, tax reduction of at most €1,200 per year; labour costs only, invoice and non-cash payment | § 35a para. 3 Income Tax Act (Einkommensteuergesetz) | retrieved 1 October 2026 |
| § 35c EStG energy-efficient renovation | 7 % + 7 % + 6 % of the expenses over three years, at most €40,000 per property; owner-occupied residential building, older than ten years, certificate from the specialist contractor | § 35c Income Tax Act (Einkommensteuergesetz) | retrieved 1 October 2026 |
In the configurator, the indicative Uw value appears live. We prepare your quotation; you submit it to the expert.
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