Standards and Standardization

A standard is by definition a technical document designed to be used as a rule, guideline or definition. It is a consensus-built, repeatable way of doing something.

At the European level, the standardization body in charge of defining standards about buildings energy performances is CEN. International standards, developed by ISO, can also be used as references in the European context. Additionally, since 1991 CEN and ISO are encouraged to work together for the development of standards.

For both European and international standards, the adoption by EU countries is voluntary, unless these standards are called up in legislation or in contracts. However, legislation also can strongly recommend the use of standards.

This is the case of the new set of EPB standards, published in 2017. Annex 1 of the EBPD recast suggests that Member States “should take into account European standards” to develop a harmonized calculation method for the energy performance of buildings.

Read more about EPB standards and European and international standardization procedures:

Opens internal link in current windowEPB standards 2017

Opens internal link in current windowEuropean standards

Opens internal link in current windowInternational standards


Standardization activities within REHVA

One of the key priorities of REHVA is supporting the national implementation of EPBD and other EU policies related to buildings energy efficiency. To do so, standards are essential tools to be exploited.

REHVA is involved in standardization activities from different sides:

EPB Center

Standards and Standardization

To promote the widespread use of EPBD-related standards, in 2017 REHVA teamed-up with ISSO to create the EPB-Center.

EPB Center’s main activities are to plan, coordinate and guide the process of promoting the implementation, use, maintenance and further development of the new set of EPB standards and to safeguard the coherence of their technical contents.

This virtuous circle of implementation-application-improvement, fed-in by standards experts and users, could play a crucial role in the actual use of these standards at local level.

CEN Liaison Organisation

REHVA works together with CEN on EPBD-related standards and aims at providing guidance and capacity building services to its member associations dealing with the EPBD implementation.

CEN and/or CENELEC offer the status of Liaison Organisation to those European organisations, including fora and consortia, representing interest groups that are committed to provide input to the work of one or more CEN and/or CENELEC Technical Bodies, as defined in the CEN-CENELEC Internal Regulations Part 2. 

REHVA is CEN Liaison Organisation for three Technical Committees:

1. CEN/TC 156 "Ventilation in buildings" (including air conditioning)
- WG19 Joint WG between TC156 and TC371 revision of EN15251
- WG20 Revision of EN13779
- WG21 Revision of calculation standards EN15241, EN15242 and EN15243
- WG23 Guidelines for inspection of ventilation systems and air conditioning systems

2. CEN/TC 228 "Heating systems and water based cooling systems in buildings" (including domestic hot water systems)
- WG04 Calculation methods and system performance and evaluation 

3. CEN/TC 371 "Project Committee on Energy Performance of Buildings" 
WG01 EPBD Standards group

REHVA has access to working documents within these technical committees and participates at technical committee level as well as at working group level, providing technical contributions to the body's meetings.

Other collaborations

Beside being a CEN Liaison Organization, REHVA undertakes parallel collaboration activities with CEN e.g. REHVA Technical Report 4 REHVA nZEB technical definition and system boundaries.

The collaboration between CEN and REHVA ensures a common understanding of contents and consistent use of terminology in different types of publications within a certain subject.