FAQ

Architects and consulting engineers, whose profession is defined by the law of 13 December 1989 organising the professions of architect and consulting engineer, as well as all experts approved by the Ministry of the Economy, can issue energy performance certificates

• Demolition: sale of a ruin or a building that does not have a heating installation and which will be demolished after purchase.
• Inheritance or gift.

• New building: any building that is subject to a building permit application. (A feasibility study concerning the use of renewable energies should be appended to the building permit application.)
• Extension of an existing building.
• Modification of an existing building (building permit required), if the surface area of the modified element of the thermal envelope exceeds the surface area of the same existing element (walls, windows, roof, etc.) by 10% and if the modification has an impact on the energy performance of the building. (Issuance of an energy performance certificate for the new planned situation.)
• Substantial alterations to an existing building (without a building permit), if the surface area of the altered element of the thermal envelope exceeds the surface area of the same existing element (walls, windows, roof, etc.) by 10% and if the alteration has an impact on the energy performance of the building. (Issuance of an energy performance certificate for the new planned situation.)
• Change of owner or tenant.
• Demolition: sale of a building that will be demolished after purchase, if the building has a heating installation, exterior walls and a roof.
• Modification of technical facilities, if the modifications of these technical facilities exceed €1,500 (for a single-family house) or €3,000 (for a multi-family house).

The energy performance certificate is a regulatory obligation, therefore no subsidy is provided for its establishment.
The energy performance certificate is issued according to precise rules set out in the amended Grand Ducal Regulation of 30 November 2007 on the energy performance of residential buildings. It is valid for 10 years from the day of its issue. The issuance of an energy performance certificate and the information it contains shall not result in any direct obligation for energy retrofitting.

The energy performance certificate (EPC) or energy passport is the quality label that defines the energy performance of a residential building. The certificate provides information on the energy efficiency of residential buildings and thus allows comparisons to be made with other residential buildings. Thus, even without technical knowledge, the consumer can assess the energy quality of a residential building.

The certificate is valid for a maximum period of 10 years from its date of issue. The expiry date of the certificate is stated next to the date of issue.

In addition, the LENOZ certificate expires when the energy pass for the residential building in question expires.

In the case of a property in co-ownership, all co-owners must sign the application form for financial aid for the certificate process. The co-ownership management body can submit the application on behalf of the co-ownership.

A LENOZ certificate is issued for all buildings or parts of buildings that have a residential building energy performance certificate. The same definitions of residential and non-residential buildings apply to the LENOZ certificate and the energy passport.

A LENOZ certificate can be issued for all residential buildings with an energy passport, whether they are new or existing residential buildings.

Issuance of the certificate is associated with Class 4 “minimum sustainability” (Chapter 0.2 of the Annex to the Grand Ducal Regulation on housing sustainability certification).
Existing residential buildings can achieve this "minimum sustainability" by means of comprehensive retrofitting works.