LENOZ sustainability certificate training

Last update

Sustainability certificates for residential buildings (LENOZ certificates) must be issued by:

  • an architect;
  • a consulting engineer;
  • an energy consultant;
  • a professional approved to perform technical tasks for the purpose of energy-related studies or inspections, and more particularly for the purpose of:
    • carrying out energy audits;
    • determining the energy performance of buildings and issuing energy performance certificates.

The certification covers 6 assessment categories.

Persons authorised to issue sustainability certificates are encouraged to undergo specific training organised by the Ministry of Housing and Spatial Planning (Ministère du Logement et de l’Aménagement du territoire).

The Ministry of Housing and Spatial Planning publishes a list of all professionals who have received such training on its website.

Who is concerned

LENOZ certificates are issued by:

How to proceed

LENOZ certification

The certification covers 6 assessment categories (comprising 143 criteria):

  • location: criteria relating to the location of the dwelling;
  • social: criteria used to assess the social features of a multi-unit building and how the floor space is used;
  • savings: criteria used to assess the energy costs for the dwelling;
  • environment: criteria used to assess, among other things, the environmental impact of the building materials used;
  • building and technical installations: criteria relating to the quality of the building and its technical installations;
  • functional features: criteria used to assess the adequacy of the dwelling for its intended use.

The sustainability certificate is drawn up by the expert handling the file, and shows the building's sustainability classification:

  • class 1: very high level of sustainability (4 LENOZ leaves), satisfying 85 % of the criteria;
  • class 2: high level of sustainability (3 LENOZ leaves), satisfying 70 % of the criteria;
  • class 3: good level of sustainability (2 LENOZ leaves), satisfying 55 % of the criteria;
  • class 4: minimal sustainability (1 LENOZ leaf), satisfying 40 % of the criteria.

LENOZ training

Applicants are invited to register for specific LENOZ training.

The training covers the following topics:

  • how to draw up a sustainability certificate;
  • how to use the specific software provided by the Ministry of Housing and Spatial Planning to prepare a sustainability certificate;
  • sustainability assessment criteria;
  • the application for financial aid to cover the cost of preparing a sustainability certificate.

List of professionals who have completed LENOZ training

The Ministry of Housing and Spatial Planning publishes a list of all professionals who have completed LENOZ training.

Building materials and Lux EeB-H-Tool software

The LENOZ software is meant to be used by authorised experts – i.e.:

However, the software may be downloaded by anyone. The building materials data currently used in the LUX-Eeb Tool H+ software can be consulted in the document entitled, "Materialdaten LENOZ 2016" (in the table on environmental impact of building materials).

Who to contact

Ministry of Housing and Spatial Planning

2 of 3 bodies shown

Related procedures and links

Your opinion matters to us

Tell us what you think of this page. You can leave us your feedback on how to improve this page. You will not receive a reply to your feedback. Please use the contact form for any specific questions you might have.

Fields marked with an asterisk (*) are mandatory.

Did you find what you were looking for?*
How would you rate this page?*
Very poor
Very good

Leave a comment to help us improve this page. Do not provide any personal information such as your email address, name, telephone number, etc.

0/1000

Please rate this page

Your opinion has been submitted successfully!

Thank you for your contribution. If you need help or have any questions, please use the contact form.

Would you like to help us make digital public services more user-friendly by submitting your suggestions for improvement?

Then visit Zesumme Vereinfachen, the online participation platform dedicated to administrative simplification in Luxembourg.

Let's simplify things together

An error occurred

Oops, an error has occurred.