EN 17680:2023

SLOVENSKI STANDARD
01-december-2023
Trajnostnost gradbenih objektov - Ovrednotenje možnosti trajnostne prenove
stavb
Sustainability of construction works - Evaluation of the potential for sustainable
refurbishment of buildings
Nachhaltigkeit von Bauwerken - Bewertung des Potentials zur nachhaltigen Sanierung
von Gebäuden
Contribution des ouvrages de construction au développement durable - Évaluation du
potentiel d'une réhabilitation contribuant au développement durable d'un bâtiment
Ta slovenski standard je istoveten z: EN 17680:2023
ICS:
13.020.20 Okoljska ekonomija. Environmental economics.
Trajnostnost Sustainability
91.040.01 Stavbe na splošno Buildings in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17680
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2023
EUROPÄISCHE NORM
ICS 91.200
English Version
Sustainability of construction works - Evaluation of the
potential for sustainable refurbishment of buildings
Contribution des ouvrages de construction au Nachhaltigkeit von Bauwerken - Bewertung des
développement durable - Évaluation du potentiel d'une Potentials zur nachhaltigen Sanierung von Gebäuden
réhabilitation contribuant au développement durable
d'un bâtiment
This European Standard was approved by CEN on 2 July 2023.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17680:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 12
4 Sustainable refurbishment, general principles . 13
5 Evaluation of building condition and performance . 17
5.1 General process . 17
5.2 General procedure . 18
5.3 Preparing the evaluation of the existing building . 19
5.3.1 Establishing the brief. 19
5.3.2 Definition of requirements . 19
5.3.3 Execution plan and competence requirements . 19
5.3.4 Acquisition and sustainable assessment of building and available building information 19
5.3.5 Assessment criteria and performance classes . 19
5.4 Condition registration and analysis . 20
5.4.1 Registration of condition and determination of performance classes . 20
5.4.2 Determination of performance classes for inaccessible parts . 21
5.5 Analysis and evaluation process for sustainable refurbishment . 21
5.5.1 Grade classes of consequences for Step 1 and Step 2 . 21
5.5.2 Evaluating the building — step 1 . 22
5.5.3 Sustainable deconstruction — Step 2 . 27
5.5.4 Sustainable construction process — Step 3 . 28
5.5.5 Commissioning – step 4 . 28
5.5.6 Sustainable in use – step 5 . 29
6 Final report . 30
6.1 Content of report . 30
6.2 Presentation and communication of results . 32
Annex A (informative) Example of classification of indicators in performance and performance
classes, from 0 – 3 . 33
Bibliography . 43

European foreword
This document (EN 17680:2023) has been prepared by Technical Committee CEN/TC 350 “Sustainability
of construction works”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2024, and conflicting national standards shall
be withdrawn at the latest by February 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
This document forms a part of a series of European Standards written by CEN/TC 350, that provide a
system for the sustainability assessment of buildings using a life cycle approach. The sustainability
assessment quantifies impacts and aspects for environmental, social and economic performance of
buildings using quantitative and qualitative indicators, both of which are measured without value
judgement. The purpose of this series of European Standards is to enable comparability of the results of
assessments. This series of European Standards does not set benchmarking or levels of performance.
European (and other) countries face big challenges transforming the existing building stock to
environmentally, economically and socially feasible buildings for the future within a low carbon society
and a higher focus on resource efficiency as a contribution to sustainable development. The
transformation and reduction of environmental impacts of existing buildings should be done in a cost-
effective manner and hence the refurbishment should be accessible and sustainable in all senses (i.e.
environmental, social and economic). The need for refurbishment emerges due to the increasing
demands for better-quality housing and the quest for energy efficiency of commercial and industrial
buildings.
In concept, the integrated building performance incorporates environmental, social and economic
performance as well the technical and functional performance, and these are intrinsically related to each
other, as illustrated in Figure 3. This document defines a simple method for qualifying the considerations
to be made in relation to evaluating the potential of refurbishing an existing building and serves to
determine the most sustainable and cost-effective approach to improve performance to comply with
national regulatory requirements, among other things. In the interest of conserving resources, options
for extended use and refurbishment are to be examined intensively and, if suitable, are to be given
preference over new construction. This document is a part of the framework of standards for
sustainability of buildings as shown in Figure 1.
This document is primarily designed to support the strategic decision process on how to refurbish
existing building(s) in a sustainable way, taking into consideration that not all buildings should be
refurbished if the existing conditions of a building do not permit. A starting point for decisions on
(further) handling of existing buildings is a comprehensive analysis. This includes a building diagnosis to
determine damage and deficiency as well as an assessment of the current technical and functional
performance. The potential for an improvement in building performance and (as far as possible) the
effort required for this are assessed. An alignment with requirements and possibilities resulting from
future user requirements or possible uses, the changing environment concerning politics and legislation,
market situation, environmental conditions and social values, as well as technical progress, is possible.
The results of the analysis can be used to make fundamental decisions on how to deal with existing
buildings. If refurbishment or repurposing are viable options, these can be investigated using the results
of a building diagnosis and being subjected to a sustainability assessment in accordance with EN 15643.
In this document, a procedure is offered to support the methodology for assessing performance
characteristics of existing building based on an indicator system and classification levels. Examples are
given in an informative annex.
Figure 1 — Framework standards for sustainability of buildings
Refurbishment can be seen as an opportunity, not only to modernize a building’s aesthetic, but also to
enhance its overall technical and functional (usability) performance, and its potential contribution to the
surrounding environment and local community.
The transformation should be done in a cost-effective manner and hence the refurbishment should be
sustainable. This document gives a simple method for which buildings to be given first priority for a
sustainable refurbishment also taking into consideration that not all buildings should be refurbished.
Benefits of sustainable refurbishment in comparison to deconstruction and redevelopment are:
— reduced landfill disposal;
— contribution to extending whole building lifetime;
— reduced environmental footprint through greater conservation and reuse of materials;
— contributing to lower life cycle costs;
— reduction in overall embodied environmental impact relative to new building.
Other benefits may include:
— retention of community infrastructure;
— additional benefits of local economic development;
— neighbourhood renewal and well-being for all stakeholders;
— protection for built cultural heritage;
— better adaptation to climate change (e.g. limiting the solar gain in summer).
1 Scope
This document provides a strategy and methodology for sustainable refurbishment of an existing
building and evaluation of the potential of sustainable refurbishment, as a means of contributing to the
circular economy, to support the decision-making process. Sustainable refurbishment aims to close the
gap between current performance and current requirements fulfilling national regulations, and
contribute to meet sustainability goals which maximize the environmental, social and economic
performance. It also aims to allow the adaptability to fulfil future needs. It can be used for a building or
part(s) of a building, as well as a portfolio of buildings. This document gives a methodology for assessing
performance characteristics of existing buildings in terms of:
a) technical aspects;
b) adaptability;
c) usability;
d) social aspects;
e) energy and water (operational impacts);
f) quality of indoor environment (including health aspects);
g) economic feasibility;
h) climate change resilience;
i) embodied environmental impacts.
The document describes the work to be done in main applicable categories of a 6 steps process:
— Step 0: Establish brief of the object of the assessment
— Step 1: Evaluating the building
— Step 2: Sustainable deconstruction
— Step 3: Sustainable construction process
— Step 4: Sustainable commissioning
— Step 5: Sustainable in use
NOTE In this document, the users are people and organizations using the building, including the facility
management. In some buildings, visitors are also important users and need to be taken in to account.
This approach is generic for all types of buildings. At present this document does not cover civil
engineering work and it does not give benchmarks for the evaluation.
This document enables a strategy to be made for sustainable refurbishment of the whole building, part
of a building or a portfolio of buildings.
Assessment of the impacts of sustainable refurbishment of buildings is covered by calculation methods
described in EN 15978, EN 16309 and EN 16627.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12464-1, Light and lighting — Lighting of work places — Part 1: Indoor work places
EN 15804, Sustainability of construction works — Environment product declarations — Core rules for the
product category of construction products
EN 15978, Sustainability of construction works — Assessment of environmental performance of buildings
— Calculation method
EN 16309, Sustainability of construction works — Assessment of social performance of buildings —
Calculation methodology
EN 16627, Sustainability of construction works — Assessment of economic performance of buildings —
Calculation methods
EN 17037, Daylight in buildings
EN 17210:2021, Accessibility and usability of the built environment — Functional requirements
3 Terms and definitions
For the purposes of this document, the following terms, definitions and abbreviations apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
accessibility
provision of buildings, parts of buildings, or outdoor built environments for people, regardless of
disability, age or gender, to be able to gain access to them, into them, to use them and exit from them
Note 1 to entry: Accessibility includes ease of independent approach, entry, evacuation and/or use of a building
and its services and facilities, and outdoor spaces by all of the potential users with an assurance of person health,
safety and welfare during the course of those activities.
[SOURCE: EN 17210:2021]
3.1.2
adaptability
ability of the object of assessments or parts thereof to be changed or modified to make suitable for a
particular use
Note 1 to entry: adaptability can be subdivided into function of flexibility, versatility and elasticity of the building,
part of or group of buildings
[SOURCE: EN 15643:2021, 3.2, modified – Note 1 to entry has been added.]
3.1.3
core business
entity from which needs are derived
Note 1 to entry: Need: expectation, specific or abstract, from the demand organization which is essential to enable
the achievement of the core purpose and key objectives
[SOURCE: EN ISO 41011:2018, 3.1.7, modified – Note 1 to entry has been added.]
3.1.4
demand profile
set of parameters and their classes coming from regulations or the client’s brief as demand levels
EXAMPLE Load bearing capacity, floor to ceiling height.
3.1.5
elasticity
adaptability related to changing the volume of the building space either outside the existing building unit
or addition of a new building(s) within the site
EXAMPLE To add extra floor(s) or horizontal extension or remove part of a building.
3.1.6
energy retrofit
installation and/or implementation of energy conservation measure in an existing building or civil
engineering works
[SOURCE: ISO 6707-3:2018, 3.4.15]
3.1.7
environmental aspect
aspect of construction works, part of works, processes or services related to their life cycle that can
change to environment
[SOURCE: EN 15643:2021, 3.33]
3.1.8
environmental impact
result of a change to the environment, whether adverse, neutral or beneficial, wholly or partially resulting
from environmental aspects
[SOURCE: EN 15643:2021, 3.34]
3.1.9
environmental performance
performance related to environmental impacts and environmental aspects
[SOURCE: EN 15643:2021, 3.35]
3.1.10
flexibility
adaptability related to changing space distribution within the existing building unit
EXAMPLE To change from cell offices to open landscape.
3.1.11
functional performance
performance related to the functionality of a construction works or part of works, which is required by
the client, users or by regulations
[SOURCE: EN 15643:2021, 3.43]
3.1.12
functional requirement
type and level of functionality of a building, civil engineering works or an assembled system which is
required by the client, users and/or by regulations
[SOURCE: EN 15643:2021, 3.44]
3.1.13
functionality
suitability or usefulness for a specific purpose or activity
[SOURCE: EN 15643:2021, 3.46]
3.1.14
versatility
adaptability related to changing the use of the building
EXAMPLE To change use from offices to school area or divide for different users (core business).
3.1.15
maintenance
combination of all technical and associated administrative actions during the service life to retain a
building, or its parts, in a state in which it can perform its required functions
[SOURCE: ISO 15686-1:2011, 3.13]
3.1.16
maintenance (planned)
combination of planned technical and associated administrative actions during the service life to retain a
building, or its parts (functional units), in a state in which they can perform their required functions
Note 1 to entry: Preventive (planned) maintenance covers cleaning, servicing, lubrication, changing wearying
parts, testing, inspection, condition monitoring, done on a periodic basis and done before a failure would occur.
[SOURCE: EN 15643:2021, 3.60, modified – “construction works or part of works” has been replaced with
“building, or its parts” in the definition]
3.1.17
performance profile
set of parameters and their classes coming from the actual object of assessment
Note 1 to entry: Calculation methods as per EN 15978, EN 16309 and EN 16627.
3.1.18
performance classes
division of performance based on criteria
Note 1 to entry: Can be specified through reference to authority requirements (legal/regulatory requirements),
client requirements, user requirements, functional requirements, or other requirements.
3.1.19
recycling
any recovery operation by which waste materials are reprocessed into products, materials or substances
Note 1 to entry: This can be done by “upcycling or high-level-recycling or recycling in closed cycles” or ”low-level-
recycling or downcycling in open cycles”.
[SOURCE: ISO 21928-2:2023, 3.33]
3.1.20
refurbishment
large scale (substantial) modification and improvements to an existing building in order to bring it up to
an acceptable condition
Note 1 to entry: Refurbishment can be undertaken to facilitate continuation of the current function, including
technical modernisation (renovation) and a change of space plan or a change of function to new use.
[SOURCE: EN 15643:2021, 3.76, modified – “construction works” has been replaced with “building” in the
definition; “in order to bring it up to an acceptable condition” has been added in the definition;
“(renovation)” has been added in the Note 1 to entry]
3.1.21
sustainable refurbishment
refurbishment to a condition that maximizes the environmental, social and economic performance
Note 1 to entry: Sustainable refurbishment shall fulfil authority’s sustainability regulations and contribute to meet
sustainability goals.
Note 2 to entry: Sustainable refurbishment aims to allow the adaptability to fulfil future needs.
3.1.22
renovation
upgrade of components, elements or systems including energy efficiency upgrading (technical
modernization)
Note 1 to entry: This also applies when upgrading is required by e.g. changed regulations.
3.1.23
repair
actions outside planned maintenance to return component or assembled system to an acceptable
condition through the renewal, replacement or mending worn, damaged or degraded parts, but not
changing its original parameters
Note 1 to entry: Repair refers to unplanned action because the component or assembled system has lost its function,
this can happen because of a lack of correct planned maintenance.
[SOURCE: EN 15643:2021, 3.79]
3.1.24
replacement
substitution of a whole construction product, building element or installation with the same or an
equivalent similar product, building element or installation to re-establish the required functional and
technical performance or to fulfil new regulations
Note 1 to entry: Replacement of a component according to current requirement. For example, replacing an old
window, the new one should be according to U-value of today.
[SOURCE: EN 15643:2021, 3.80]
3.1.25
re-use
operation by which products or components that are not waste are used again for the same purpose for
which they were conceived or used for other equivalent purposes without reprocessing, but including
preparation for re-use
Note 1 to entry: Preparation for re-use includes checking, removal of connectors, cleaning, trimming, stripping of
coatings, packaging, repairing.
[SOURCE: EN 15643:2021, 3.83]
3.1.26
social aspect
characteristics of the construction works, part of works, processes or services related to their life cycle
that can cause change to society or quality of life
[SOURCE: EN 15643:2021, 3.89]
3.1.27
social impact
result of a change to society or quality of life (including health and well-being) of individuals or at the
level of neighbourhoods or other areas of influence, whether adverse, neutral or beneficial, wholly or
partially resulting from social aspects
[SOURCE: EN 15643:2021, 3.90]
3.1.28
social performance
performance related to social impacts and social aspects
[SOURCE: EN 15643:2021, 3.91]
3.1.29
sustainability assessment of buildings
combination of the assessments of environmental performance, social performance, economic
performance, usability performance and adaptability performance taking into account the technical and
functional requirements
Note 1 to entry: Will make it possibility to set up different requirement profiles for the asset.
Note 2 to entry: Embodied and operational impact requirements should be included.
[SOURCE: EN 15643:2021, 3.94, modified – “construction works” has been replaced with “building” in the
definition]
3.1.30
sustainable building
building that fulfils all necessary economic, environmental and social as well as technical and functional
requirements, based on its intended use over the lifecycle of the building
Note 1 to entry: A sustainable building aims to fulfil UN Sustainable Development Goals relevant for the built
environment.
3.1.31
usability
to what extend a building, or part thereof, is suited for its purpose
3.1.32
user
persons or organization for which a building is designed (including owner, manager and occupants)
Note 1 to entry: Manager include Facility Management (FM) organization and people.
Note 2 to entry: Occupants include core business organization and people in organization.
Note 3 to entry: In some cases, it can include visitors (hospitals, terminal buildings, shopping centres, etc.).
[SOURCE: Adapted from definition in ISO 6707-1]
3.1.33
well-being
balance between economy aspects, environmental aspects and social aspects affecting owners, core
business, facility management and individual users of buildings
Note 1 to entry: Includes also use of space between buildings (neighbourhood) for all users.
Note 2 to entry: Healthy building should provide people within the building an environment and air quality so the
occupants can operate at their highest functionality.
Note 3 to entry: Also includes safety and security.
3.2 Abbreviations
VOC volatile organic compounds
TVOC total volatile organic compounds
4 Sustainable refurbishment, general principles

Figure 2 — Decision methodology process
Starting point will be evaluation of the building, as shown in Figure 2, as a methodology process. The
options are whether to sustainably deconstruct, use as is or refurbish for same use or other use based on
the evaluation of technical and environmental condition, usability and adaptability.
The condition of performance of buildings should be evaluated against expected requirements and needs
now and in the future, including comparisons of environmental impacts between different options in the
decision-making process. Each level of performance (current and proposed) should be recorded. To do
this the existing condition and performance needs to be assessed and evaluated. These will be used as a
basis for assessing different options for refurbishment and the respective resource efficiency of these
options. The difference between the two levels, requirements and performance as shown in Figure 3,
gives information on the refurbishment or other measures needed. Closing the gap should not change the
buildings physical performance in a way that can introduce negative impacts on indoor environment and
building damages. E.g. condensation, moisture, mould, increased snow loads.
Figure 3 — Sustainable actions/process to close the gaps
NOTE The aim of sustainable refurbishment is to close the gap between existing performance and ambition
level of requirements.
For building owner/client, the decision of refurbishment versus redevelopment is dependent on the
commercially available options in conjunction with maximizing the building’s economic, social and
environmental performance, including resource efficiency and health performance for the building
occupant as well as the owner. Well-being for owners and users is the balance between economy aspects,
environmental aspects and social aspects.
Plotting results of adaptability and usability into a matrix, see Figure 4, it is possible to see the options
for the same core business function. The aim of Sustainable refurbishment is to “move” buildings, part of
a building or portfolio of buildings into a better zone within the matrix, as shown in Figure 4, by improving
usability due to satisfactory adaptability. This process may also help to identify buildings with poor
usability or adaptability where this will not be possible to achieve within overall budget or resource
constraints.
Key
Quadrant I) Building for a long service life due to satisfactory adaptability
Quadrant II) Due to satisfactory adaptability the building can be made usable for a long service life for same
or new use. Sustainable refurbishment is recommended. See arrow 1.
Quadrant III) Building for a limited service life, due to unsatisfactory adaptability. The building will in time
move to quadrant IV) if demand for adaptability occur, see arrow 2.
Quadrant IV) Building with unsatisfactory usability and adaptability. This building can be moved to quadrant
III) with new core business function. See arrow 3.
Arrow 1 moving from unsuitable for the current use to suitability due to good adaptability for same use
Arrow 2 moving from suitable usability to unsuitable when adaptability is needed but is not present
Arrow 3 moving from unsuitable and not adaptable to suitable to new use if possible
Figure 4 — Overall assessment of the building
Refurbishment in this document is considered broader than renovation and can include change of space
plan. By also adding the sustainability aspects to refurbishment (see Figure 5) the result is a more
qualitative project with the view to meet future requirements with minimum environmental impact.
Key
a Requirement at construction time as new building
b Maintenance
NOTE 1 Only maintenance will lead to some repaired and replacements in the future.

c Renovation: Upgrading the fabric/material, components and energy retrofit
NOTE 2 For listed buildings, renovation (c) might only reach line (a) depending on national regulations.
d Refurbishment: Major renovation that can also include change of space distribution in connection with
construction activities
NOTE 3 Fulfil new requirements on performance from core business.
NOTE 4 In certain circumstances refurbishment measures might not reach sustainability requirements.
NOTE 5 Requirements to space distribution and renovation and change of use.
1. Performance level with just maintenance and replacement of components, elements and systems,
including new energy efficiency upgrade.
2. Upgrading level: Technical upgrade to today’s performance demands.
3. Sustainability level: New demands related to sustainability performance. (Renovation that also
includes change space distribution)
Figure 5 — Relation between renovation and refurbishment
The technical and functional requirements will indicate which parts may require maintenance,
renovation or refurbishment.
Any particular demands for, or related to, the environment, social and economic performance defined in
the client’s brief or in the regulations, should be declared and communicated.
The main aspects of key performance indicators, as defined in this document, are intended to be complete
regarding general needs from the sustainable point of view to reach the level of ambition (and as a
classification tool for buildings in general).
Refurbishment or renovation might be done in one operation or a series of operations.
EXAMPLE
— Part by part of a building
— Building by building of a portfolio
— Component by component of a building
5 Evaluation of building condition and performance
5.1 General process
The general process starts when the property owner or one of the other user groups evaluates the status
of the building. In general, the process can follow steps as shown in Figure 6.
This document describes mainly the sustainability assessment in Step 1 which consists of information
related to the other steps.
Figure 6 — Decision flowchart
Requirements to be followed for each step should be:
Step 0: Establish brief of the object of the assessment based on information from step 5 together with
client’s strategy.
Step 1: Following a comprehensive sustainability assessment of elements shown in Table 3 following
process given in Figure 7, evaluation of different approaches to methods and technologies should then
take place to identify and evaluate possible courses of action and to support decision-making. After
decision of what option to follow a planning process shall take place (use as is (operate and maintain),
refurbish or renovation, deconstruct (end of life)) before further steps. Planning shall also consider reuse
of materials according to circular economy.
Step 2: Deconstructing either for renovation, refurbishment, or deconstruction, taking into account
circularity and sustainability.
Design for deconstruction/audit should be taken into account.
Step 3: Sustainable rebuild considering all sustainable aspects concerning economy (life cycle cost),
environment (indoor climate and all environmental impacts) and social aspects.
Step 4: Commissioning with quality assurance on as build information / documentation, training
completed on all aspects of facility management.
Step 5: In use evaluation should be followed up with remedial actions to keep the building on the initial
sustainable performance. The detailed assessment of sustainable refurbishment should be in accordance
with calculation methods described in EN 15978, EN 16309 and EN 16627.
Listed buildings and buildings of heritage value will need extra considerations. See EN 16096.
5.2 General procedure
The assessment is used to determine the achieved level of performance (here referred to as classification
of performance) and condition of the building(s) or part(s) of a building, by comparing the performance
against requirements to identify the gaps as the basis for evaluation.
General procedure is given in subsequent clauses shown in Figure 7.

Figure 7 — Recommended procedure for the condition survey
5.3 Preparing the evaluation of the existing building
5.3.1 Establishing the brief
The purpose and scope of the evaluation to be agreed with the client. Evaluation of a building, part of a
building or group of buildings with its technical systems should be used as basis for decision-making on
other activities, such as maintenance planning, repair, valuation etc. To make decision on refurbishment
or not, it is also necessary to evaluate usability including universal accessibility, see EN 17210:2021,
adaptability and indoor climate. Number of indicators to be examined should be according to the
categories; 18 for technical evaluation, 14 for adaptability, 7 for usability, 4 for social aspects, 4 for energy
and water (operational impacts), 12 for indoor condition (health) 5 for economy, 6 for climate change
resilience and 1 for embodied environmental impact, see subclause 5.5. For indicators; see appropriate
subclause under 5.5. All appropriate indicators shall be considered.
Architectural qualities, city planning, cultural aspects and protection of listed buildings should be
considered as a part of the establishment of the clients brief for sustainable refurbishment.
The indicators that will be classified can be weighted to accommodate needs for the individual project.
A brief description shall be given of the method of construction, the structural design and material usage.
5.3.2 Definition of requirements
The brief of the client shall state the requirements that are to be used as a basis for the description and
determination of grade classes of consequences (see example Table 1). Requirements shall be specified
and reported through reference to legal and regulatory requirements, client requirements, user
requirements, technical requirements, functional requirements and sustainable requirements or other
requirements.
5.3.3 Execution plan and competence requirements
A plan for the evaluation process which covers all activities in accordance with Figure 7 should be
prepared and reported to the client.
The party who is responsible for performing the assessment should be familiar with the requirements in
this document and possess. The competence that is required should be described in the clients brief in
addition to applicable national regulations.
5.3.4 Acquisition and sustainable assessment of building and available building information
Relevant information concerning the building shall be obtained and collected according to the
requirement of the evaluation. Available underlying information shall be reviewed and assessed
according to relevant sustainability assessment standards EN 15978, EN 16309 and EN 16627.
In the case of lack of documentation of the building, there will be many opportunities for hidden
nonconformities. In such cases, it may be appropriate to state that the documentation is generally
insufficient and does not meet current requirements, and to carry out a general assessment of the extent
to which the possible hidden nonconformities are real, instead of listing all possible hidden
nonconformities.
NOTE Relevant information can be obtained from persons in facility management-organization responsible for
the building.
5.3.5 Assessment criteria and performance classes
To assess the results of a building diagnosis in a narrower sense and a comprehensive analysis of existing
buildings in a broader sense, the development of a system of assessment criteria is necessary. These shall:
— cover relevant topics/ aspects (Table 2 describes the minimum scope of topics);
— avoid double counting;
— identify conflicting goals.
Such systems can (should):
— contain specifications for partial and/ or full aggregation/single score;
— contain specifications for specific presentation forms that provide an overview of the results.
To evaluate the results per assessment criteria, performance classes are required. The performance
classes are an expression of the condition of building or a part/component in relation to the chosen
reference level. Prior to the recording of performance classes, a set of criteria shall be prepared which
represents the framework for the determination of the performance classes for the various parts of the
building indicators as shown in subclauses under 5.5.
These performance classes shall:
— be adaptable to the specific aspects of the available results of technical assessments/inspections,
measurements, surveys or calculations, costs;
— enable a clear assignment of the results to a class;
— are based on scientific knowledge or generally recognized performance features;
— have a temporary validity.
Number of performance classes should not exceed 4 per individual indicator.
NOTE 1 A larger number of performance classes might lead to a degree of accuracy that is not realistic.
Examples are given in Annex A. These criteria shall be determined based on the purpose of the evaluation
and a consequence assessment, see Table 1. Examples of performance classes are shown in Annex A
Table A.1.
If there is a national classification system in place, this should be used. If there is no national classification
system, a classification system needs to be created. Examples on how this can be done is shown in
Annex A.
NOTE 2 The significance and determination of performance classes can be based on symptoms of defects. The
analysis of defect symptoms of will contribute to greater objectivity in the diagnosis of conditions. Such symptom
descriptions could for example be formulated as image directories or in matrices as shown with examples given in
Annex A.
A defined scale shall be used for grading. The same scale shall be used for all main categories, as shown
in Table 3, Table 4, Table 5 and Table 6. An example of a scale from 0 to 3 is described in Table 1 can be
used.
5.4 Condition registration and analysis
5.4.1 Registration of condition and determination of performance classes
The condition shall be specified through performance classes, example of this is shown in Table A.1. In
the case of nonconformity being identified, a statement shall be given of the requirement to which
nonconformity relates, and it shall be documented, if appropriate with descriptions, drawings, reports,
sketches and photographs.
The person who carries out the condition survey shall notify the building owner/client immediately of
any circumstances with major and serious consequences.
NOTE 1 See also Clause 6 concerning what needs to be included in the report.
NOTE 2 The scope of nonconformity can be specified in writing as a percentage of the total quantity, as absolute
dimensions or by normative references.
5.4.2 Determination of performance classes for inaccessible parts
For parts of building that are inaccessible, a performance classes shall be determined insofar as is
possible based on symptoms of nonconformities relating to adjacent parts/ building or according to other
indications of nonconformities. If t
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