Applying for financial aid for energy efficiency renovation of a residential building based on an energy consultant's report (Klimabonus)

The Environment Agency (Administration de l’environnement) grants subsidies for energy efficiency renovation projects undertaken to:

The Klimabonus scheme applies to the sustainable energy efficiency enhancement of residential buildings older than 10 years from the date of issue of the building permit.

For energy performance assessments carried out prior to 31 December 2021, the previous PRIMe House aid scheme still applies.

This Klimabonus aid can only be granted once and only for a residential building located in Luxembourg.

Who is concerned

Applicants concerned

Any person who wishes to improve the energy performance of their residential building, that is, any:

  • natural person;
  • legal person established under private law;
  • public legal person other than the State.

Applicants may be:

  • the legal representative of a group of natural or legal persons, provided that the legal representative is part of this group;
  • the person(s) who own(s) the residence, except when there is a change of ownership and the new owner of the residence and/or technical installation forgoes the aid in question for the benefit of the former owner who made the investments.

Works concerned

Financial aid may be sought, in particular, for:

  • the insulation of roofing;
  • the insulation of an external wall;
  • the insulation of a ceiling slab in contact with an unheated attic;
  • the insulation of a floor slab in contact with an unheated cellar, the ground or the exterior;
  • the insulation of a wall in contact with the ground or an unheated zone;
  • the replacement of windows;
  • centralised or decentralised controlled ventilation systems.

Prerequisites

Eligible buildings

The residential building must be older than 10 years from the date of issue of the building permit when the financial aid application is submitted.

The date of the building permit or the certificate issued by the communal administration constitute proof of the age of the building.

Technical requirements to be fulfilled

To be eligible for the subsidy:

  • the renovated elements must not exceed certain heat transfer coefficients;
  • the minimum thickness of the insulating material (performance standard III) must be complied with for all other performance standards;
  • insulation materials must comply with the requirements of the Ieco12 ecological indicator;
  • from 1 January 2024, fossil-based insulation materials will be subsidised only if they are made from at least 50 % recycled materials;
  • if the attic space is heated, the renovation of the roofing must also be associated with the replacement of the roof windows if the latter are more than 10 years old and do not meet the heat transfer coefficient criterion of 1.40 W/m2K;
  • to prevent humidity due to condensation, and the ensuing problems (mold, etc.), the renovation of the windows may be subsidised, provided that:
    • the exterior wall or roof of the heated attic has a heat transfer coefficient that is less than or equal to 0.85 W/m2K, 0.80 W/m2K or 0.75 W/m2K, depending on the targeted performance standard; or
    • the building has a controlled mechanical ventilation system.
  • if a controlled ventilation system with heat recovery is being installed:
    • the yield of the heat recovery system ('Wärmebereitstellungsgrad') must be greater than or equal to 80 %;
    • the absorbed electrical power may not exceed 0.40 W/(m3/h);
    • the building must be airtight (n50 = 2.0 1/hour), ascertained by an airtightness test;
    • at least 90% of the energy reference area must be mechanically ventilated.

Requirements for enhanced construction elements

  Performance standard III Performance standard II *** Performance standard I ***
  Minimum thickness of insulation in cm Maximum value of U (W/m2K) Maximum value of U (W/m2K)
External wall (external insulation) 15 0.17 0.13
External wall (internal insulation) or insulation of the internal side combined with insulation of the external side***** 8 * 10 cm * 12 cm *
Ground-supported wall or unheated zone 12 0.22 0.15
Pitched or flat roof **** 20 0.13 0.10
Ceiling slab against unheated zone 20 0.13 0.10
Floor slab in contact with an unheated zone or the ground or the exterior 12 0.22 0.15
Windows and French windows (glass and frame)** 0.85 W/(m2K) 0.80 0.75

The minimum thicknesses of the thermal insulation materials shown in the table above apply to a heat conductivity of 0.035 W/(mK) for the insulation material. For other heat conductivities, the minimum thicknesses should be converted based on the actual heat conductivity of the insulation material.

* The minimum thicknesses of the thermal insulation materials shown in the table above for external walls insulated on the internal side apply to a heat conductivity of 0.040 W/(mK) for the insulation material. For other heat conductivities, the minimum thicknesses should be converted based on the actual heat conductivity of the insulation material.

** The requirements correspond to triple glazed windows and apply to a standard-size window (1.23 m x 1.48 m). Conditions:

  • either guarantee a certain heat quality of the external wall based on the targeted performance standard (Uwall ≤ 0.85 W/m2K, 0.80 W/m2K or 0.75 W/m2K);
  • or install a controlled mechanical ventilation system.

*** The minimum thickness of the insulation material (performance standard III) must be complied with for all other performance standards.

**** If the loft space is heated, the renovation of the roof must include the replacement of the roof windows (if they are > 10 years old, and if UW > 1.4 W/m2K)

***** If both the internal and external sides are insulated, the insulation material applied on the external side must have a thermal resistance R of at least 2 (m2K)/W.

It should be noted that the minimum energy performance requirements also apply to residential buildings that are protected in the public interest, and are either fully or partially listed as national monuments.

Preliminary steps

To receive the Klimabonus aid for the sustainable energy efficiency renovation works for an existing building, applicants must obtain an energy performance assessment and report in advance. The report must be issued by an approved energy consultant to ensure that the energy efficiency renovation project is adequate before the works begin.

The invoice for this consultancy service must be issued between 1 January 2022 and 31 December 2025 inclusive.

The report drawn up in connection with the energy assessment contains recommendations on how to improve the building's energy performance. A subsidy may also be granted for this consultancy service.

Deadlines

Applications for subsidies must be filed after the completion of the works within 4 years as of 31 December of the calendar year that the invoice apply to.

The invoices for the energy efficiency renovation works must be issued between 1 January 2022 and 31 December 2029 inclusive.

The first application for an agreement in principle must be submitted between 1 January 2022 and 31 December 2025 inclusive.

The energy efficiency renovation works must have been carried out on the basis of an energy efficiency report that is invoiced from 1 January 2022 up to and including 31 December 2025.

Applications for financial aid for liquidation must be submitted no later than 31 December 2031.

How to proceed

Applications for the grant must be filed with the Single point of contact for housing assistance (Guichet unique des aides au logement).

Prior to the works: application for the agreement in principle

Prior to commencing the energy efficiency renovation works, applicants must obtain an agreement in principle from the Single point of contact for housing assistance, established on the basis of an energy consultant's report.

To obtain the agreement in principle, the applicant must send the following documents to the Single point of contact for housing assistance (preferably by registered post), or submit them in person:

  • if they are a private individual: the DEPA-2022 financial aid application form for natural persons (see the section 'Forms /Online services');
  • if they are a legal person: the DEPA-2022 financial aid application form for legal persons (see the section 'Forms /Online services').

The form must be accompanied by all the required supporting documents.

Once the agreement in principle has been obtained, the applicant for the Klimabonus financial aid may begin their works.

Note: If, based on the advice of the energy consultant, the applicant changes their renovation concept after obtaining the agreement in principle, they may file an application to obtain a new agreement.

After the works: request for payment of the aid

Once the energy efficiency renovation works have been completed, the applicant may apply for the payment of the financial aid for energy efficiency renovation. To do this, they must use the form 'Confirmation of energy efficiency renovation of an existing residential building' (Confirmation rénovation énergétique d’un logement existant – CONF-2022) that has been provided by the approved energy consultant.

This form must be accompanied by the required supporting documents.

Supporting documents

For the application for the agreement in principle, in addition to the DEPA-2022 financial aid application form (natural or legal person), applicants must also provide:

  • the appendix form entitled 'Energy efficiency renovation concept' (Concept d’assainissement énergétique - COAS_2022), specifying all of the projected energy efficiency renovation measures subject to the agreement in principle. It must be completed and signed by the approved energy consultant;
  • upon the AEV's request, the concluding report prepared by the energy consultant, including the overall inventory and the entire energy efficiency renovation concept;
  • a copy of the initial building permit for the building or an official document certifying the age of the building;
  • the energy performance certificate (certificat de performance énergétique – CPE) of the building before the renovation works;
  • if a controlled mechanical ventilation system is being installed, construction plans that:
    • correspond to the situation after the energy efficiency renovation works; and
    • illustrate the energy reference area and the mechanically ventilated portion of this area;
  • in the case of an extension/enlargement of the building's thermal envelope, building plans corresponding to the situation after the energy efficiency renovation works;
  • an estimate of the energy consultant's fees or a confirmed estimate per projected measure.
  • If the application is for a commonhold property or a multi-unit residence:

For the aid payment application, in addition to the form titled 'Confirmation of energy efficiency renovation of an existing residential building' (Confirmation rénovation énergétique d’un logement existant – CONF-2022), applicants must also provide:

  • if the applicant is a private individual: the DEPA-2022 aid application form for natural persons;
  • if the applicant is a legal person: the DEPA-2022 financial aid application form for legal persons;
  • copies of invoices that prove the eligible costs and proof of payment (notice of debit or invoice receipted in due and proper form). The invoices may refer to a detailed estimate, in which case the latter must be attached to the invoice.
    The invoices for the energy consultation must be detailed as follows:
    • the energy consultation provided;
    • confirmation of the conformity of the estimates;
    • confirmation of the conformity of the on-site works;
    • any thermal bridge calculations;
  • the final report prepared by the energy consultant upon confirmation of the compliance of the offers and the on-site works;
  • the energy performance certificate (certificat de performance énergétique – CPE) of the building after the renovation works;
  • if a controlled mechanical ventilation system with heat recovery is installed, the duly signed airtightness assessment reports and certificate.
  • If the application is for a commonhold property or a multi-unit residence:

The Single point of contact for housing assistance may ask the applicant to provide any documents it deems necessary to process the file.

Amount of subsidies

Basic subsidy

The amounts are calculated based on the surface areas of the renovated elements. The area of the renovated element is multiplied by the corresponding amount shown in the table below.

  Specific financial aid (euros/m2 refurbished)
Refurbished construction element of the thermal envelope Category of insulation material Performance standard III Performance standard II Performance standard I
Element in contact with the exterior: external wall (insulated on the external side, on the internal side in combination with insulation on the external side, or insulated solely on the internal side**), pitched or flat roof, floor slab in contact with the exterior a. fossil-based and other materials* 25 30 40
b. mineral 45 50 60
c. eco-friendly 70 75 85
Element in contact with an unheated zone or the ground: ceiling slab in contact with an unheated zone, wall or floor slab in contact with the ground or an unheated zone a. fossil-based and other materials* 15
20
30
b. mineral 20 25 35
c. eco-friendly 30 35 45
Windows and French windows   50 55 60

* materials that do not fall under the definitions of categories (b) and (c)

** for insulating material placed only on the internal side, the specific financial aid [euros/m2 refurbished] shown in the table above is reduced by 25 %; the requirement that mineral insulation material (category (b)), and eco-friendly insulation material (category (c)) be installed mechanically does not apply for insulation material placed only on the interior side.

Aid mark-up for the use of recycled materials for fossil-based and mineral insulation material

If fossil-based or mineral insulation materials made from at least 50 % recycled materials are used, a EUR 15 mark-up on the base subsidy is granted.

Aid mark-up for the use of eco-friendly insulation materials whose components are sourced from certified sustainable crops

If eco-friendly insulation materials whose components are sourced from certified sustainable crops are used, a EUR 15 mark-up on the base subsidy is granted.

Energy bonus

If the building meets thermal insulation classes C, B or A after renovation, the amount of the subsidy granted for the individual measures implemented on the thermal envelope may be increased, on condition that the thermal insulation class has improved by at least two classes.

To obtain the bonus, the insulation measures may also be implemented in stages.

Thermal insulation class after
renovation
Bonus on the amount of the subsidy granted
for measures implemented on the thermal envelope
C 20%
B 30 %
A 50 %

Proof of eligibility for the bonus must be demonstrated by producing the energy performance certificates before and after the energy efficiency renovation works.

Measures implemented and subsidised under the former PRIMe House aid scheme may be taken into account to demonstrate the improvement by at least 2 classes, which is required for eligibility for the aid bonus.

Controlled mechanical ventilation system

The financial aid is calculated based on the energy reference area shown on the building's energy performance certificate.

The energy reference area is multiplied by the corresponding amount shown in the table below.

  Financial aid (in euros per m2)
  Single-family home Home in a multi-unit building
Ventilation with heat recovery 45 45

Payment of financial aid

The aid is generally transferred directly to the applicant's account.

If the application for financial aid is submitted by the legal representative of a group of natural or legal persons, the aid is transferred directly to the bank account of the legal representative, who must immediately credit the bank accounts of the natural or legal persons concerned with their respective share of the aid.

A copy of these payments must be sent to the Single point of contact for housing assistance.

Repayment of aid

If the applicant has already received the aid, they may be required to return it, if:

  • the applicant is found to have made inaccurate or incomplete statements in order to obtain the aid; or
  • the applicant fails to provide the Single point of contact for housing assistance with the requested information and documents.

Good to know

Some communes grant aid to supplement State aid for energy savings and renewable energies. For more information, please contact the commune of of residence or Klima-Agence.

Forms / Online services

Demande d’une aide dans le cadre du PAQUET BANQUE CLIMATIQUE ET LOGEMENT DURABLE - DEPA-2022 - Personne physique

Les informations qui vous concernent recueillies sur ce formulaire font l’objet d’un traitement par l’administration concernée afin de mener à bien votre demande.

Ces informations sont conservées pour la durée nécessaire par l’administration à la réalisation de la finalité du traitement

Les destinataires de vos données sont les administrations compétentes dans le cadre du traitement de votre demande. Veuillez-vous adresser à l’administration concernée par votre demande pour connaître les destinataires des données figurant sur ce formulaire. Conformément au règlement (UE) 2016/679 relatif à la protection des personnes physiques à l'égard du traitement des données à caractère personnel et à la libre circulation de ces données, vous bénéficiez d’un droit d’accès, de rectification et le cas échéant d’effacement des informations vous concernant. Vous disposez également du droit de retirer votre consentement à tout moment.

En outre et excepté le cas où le traitement de vos données présente un caractère obligatoire, vous pouvez, pour des motifs légitimes, vous y opposer.

Si vous souhaitez exercer ces droits et/ou obtenir communication de vos informations, veuillez-vous adresser à l’administration concernée suivant les coordonnées indiquées dans le formulaire. Vous avez également la possibilité d’introduire une réclamation auprès de la Commission nationale pour la protection des données ayant son siège à 15, boulevard du Jazz L-4370 Belvaux.

En poursuivant votre démarche, vous acceptez que vos données personnelles soient traitées dans le cadre de votre demande.

Demande d’une aide dans le cadre du PAQUET BANQUE CLIMATIQUE ET LOGEMENT DURABLE - DEPA-2022 - Personne morale

Les informations qui vous concernent recueillies sur ce formulaire font l’objet d’un traitement par l’administration concernée afin de mener à bien votre demande.

Ces informations sont conservées pour la durée nécessaire par l’administration à la réalisation de la finalité du traitement

Les destinataires de vos données sont les administrations compétentes dans le cadre du traitement de votre demande. Veuillez-vous adresser à l’administration concernée par votre demande pour connaître les destinataires des données figurant sur ce formulaire. Conformément au règlement (UE) 2016/679 relatif à la protection des personnes physiques à l'égard du traitement des données à caractère personnel et à la libre circulation de ces données, vous bénéficiez d’un droit d’accès, de rectification et le cas échéant d’effacement des informations vous concernant. Vous disposez également du droit de retirer votre consentement à tout moment.

En outre et excepté le cas où le traitement de vos données présente un caractère obligatoire, vous pouvez, pour des motifs légitimes, vous y opposer.

Si vous souhaitez exercer ces droits et/ou obtenir communication de vos informations, veuillez-vous adresser à l’administration concernée suivant les coordonnées indiquées dans le formulaire. Vous avez également la possibilité d’introduire une réclamation auprès de la Commission nationale pour la protection des données ayant son siège à 15, boulevard du Jazz L-4370 Belvaux.

En poursuivant votre démarche, vous acceptez que vos données personnelles soient traitées dans le cadre de votre demande.

Ouvrage collectif - Fiche annexe COLL-2022

Les informations qui vous concernent recueillies sur ce formulaire font l’objet d’un traitement par l’administration concernée afin de mener à bien votre demande.

Ces informations sont conservées pour la durée nécessaire par l’administration à la réalisation de la finalité du traitement

Les destinataires de vos données sont les administrations compétentes dans le cadre du traitement de votre demande. Veuillez-vous adresser à l’administration concernée par votre demande pour connaître les destinataires des données figurant sur ce formulaire. Conformément au règlement (UE) 2016/679 relatif à la protection des personnes physiques à l'égard du traitement des données à caractère personnel et à la libre circulation de ces données, vous bénéficiez d’un droit d’accès, de rectification et le cas échéant d’effacement des informations vous concernant. Vous disposez également du droit de retirer votre consentement à tout moment.

En outre et excepté le cas où le traitement de vos données présente un caractère obligatoire, vous pouvez, pour des motifs légitimes, vous y opposer.

Si vous souhaitez exercer ces droits et/ou obtenir communication de vos informations, veuillez-vous adresser à l’administration concernée suivant les coordonnées indiquées dans le formulaire. Vous avez également la possibilité d’introduire une réclamation auprès de la Commission nationale pour la protection des données ayant son siège à 15, boulevard du Jazz L-4370 Belvaux.

En poursuivant votre démarche, vous acceptez que vos données personnelles soient traitées dans le cadre de votre demande.

Procuration - Fiche annexe PROC-2022

Les informations qui vous concernent recueillies sur ce formulaire font l’objet d’un traitement par l’administration concernée afin de mener à bien votre demande.

Ces informations sont conservées pour la durée nécessaire par l’administration à la réalisation de la finalité du traitement

Les destinataires de vos données sont les administrations compétentes dans le cadre du traitement de votre demande. Veuillez-vous adresser à l’administration concernée par votre demande pour connaître les destinataires des données figurant sur ce formulaire. Conformément au règlement (UE) 2016/679 relatif à la protection des personnes physiques à l'égard du traitement des données à caractère personnel et à la libre circulation de ces données, vous bénéficiez d’un droit d’accès, de rectification et le cas échéant d’effacement des informations vous concernant. Vous disposez également du droit de retirer votre consentement à tout moment.

En outre et excepté le cas où le traitement de vos données présente un caractère obligatoire, vous pouvez, pour des motifs légitimes, vous y opposer.

Si vous souhaitez exercer ces droits et/ou obtenir communication de vos informations, veuillez-vous adresser à l’administration concernée suivant les coordonnées indiquées dans le formulaire. Vous avez également la possibilité d’introduire une réclamation auprès de la Commission nationale pour la protection des données ayant son siège à 15, boulevard du Jazz L-4370 Belvaux.

En poursuivant votre démarche, vous acceptez que vos données personnelles soient traitées dans le cadre de votre demande.

Who to contact

Double click to activate the map

We are interested in your opinion

How would you rate the content of this page?

Last update