prEN 17680

Sustainability of construction works - Evaluation of the potential for sustainable refurbishment of buildings

This document provides a methodology for the evaluation of the potential for sustainable refurbishment of an existing building, 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 authorities’ sustainability regulations and contribute to meet sustainability goals which maximizes 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:
1)   Technical aspects
2)   Adaptability
3)   Usability
4)   Social aspects
5)   Energy, water and operational impacts
6)   Quality of indoor environment (including health aspects)
7)   Economic feasibility
8)   Climate change resilience
9)   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 organisations using the building, including the facility management. In some buildings visitors are also important users and need to be taken into 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.
Assessment of the impacts of sustainable refurbishment of buildings is covered by calculation methods described in EN 15978, EN 16309 and EN 16627.

Nachhaltigkeit von Bauwerken - Bewertung des Potentials zur nachhaltigen Sanierung von Gebäuden

Dieses Dokument enthält ein Verfahren für die Bewertung des nachhaltigen Modernisierungspotentials eines bestehenden Gebäudes als Beitrag zur Kreislaufwirtschaft, um den Entscheidungsprozess zu unterstützen. Ziel der nachhaltigen Modernisierung ist es, die Lücke zwischen gegenwärtiger Leistung und gegenwärtigen Anforderungen bei der Erfüllung der behördlichen Nachhaltigkeitsbestimmungen zu schließen und zur Erfüllung der Nachhaltigkeitsziele beizutragen, wodurch die umweltbezogene, soziale und ökonomische Leistung maximiert wird. Ein weiteres Ziel ist, die Anpassbarkeit zu ermöglichen, um zukünftige Bedürfnisse zu erfüllen. Sie kann für ein Gebäude oder für (einen) Gebäudeteil(e) und auch für einen ganzen Gebäudebestand zutreffen.
Dieses Dokument enthält eine Verfahrensweise für die Bewertung der Qualitätsmerkmale von bestehenden Gebäuden, im Sinne von:
1)   technischen Aspekten;
2)   Anpassbarkeit;
3)   Nutzbarkeit;
4)   sozialen Aspekten;
5)   Auswirkungen von Energie, Wasser und Betrieb;
6)   Qualität des Raumklimas (einschließlich Gesundheitsaspekte);
7)   wirtschaftlicher Durchführbarkeit;
8)   Widerstandsfähigkeit gegen klimatische Veränderungen;
9)   damit verbundenen Umweltauswirkungen.
Das Dokument beschreibt die auszuführenden Arbeiten in den Hauptkategorien eines 6-stufigen Prozesses:
   Schritt 0: Nutzeranforderungen an den Bewertungsgegenstand festlegen;
   Schritt 1: Bewertung des Gebäudes;
   Schritt 2: nachhaltiger Rückbau;
   Schritt 3: nachhaltiger Aufbauprozess;
   Schritt 4: nachhaltige Inbetriebnahme;
   Schritt 5: Nachhaltigkeit während der Nutzung.
ANMERKUNG   In diesem Dokument sind die Gebäudenutzer Personen und Organisationen, die das Gebäude nutzen, einschließlich des Facility Managements. In einigen Gebäuden sind Besucher auch wichtige Gebäudenutzer und müssen berücksichtigt werden.
Dieser Ansatz ist für alle Gebäudearten gleich. Zurzeit werden in diesem Dokument keine Ingenieurbauwerke behandelt und es werden keine Richtwerte für die Bewertung angegeben.
Die Bewertung der Auswirkungen einer nachhaltigen Modernisierung von Gebäuden wird durch die in EN 15978, EN 16309 und EN 16627 beschriebenen Berechnungsverfahren abgedeckt.

Contribution des ouvrages de construction au développement durable - Évaluation du potentiel d’une réhabilitation d’un bâtiment contribuant au développement durable

Le présent document fournit une méthode d’évaluation du potentiel d’une réhabilitation d'un bâtiment existant contribuant au développement durable, en tant que moyen de contribution à l’économie circulaire, afin de soutenir le processus de décision. Une réhabilitation qui contribue au développement durable a pour objectif de combler l'écart entre les performances et les exigences réglementaires actuelles sur la contribution au développement durable et de contribuer à atteindre les objectifs de développement durable qui maximisent les performances environnementales, sociales et économiques. Elle vise également à permettre l'adaptabilité afin de répondre aux besoins futurs. Elle peut s’appliquer à un bâtiment ou à une ou plusieurs parties de celui-ci, ou encore à un parc de bâtiments.
Le présent document fournit une méthode d’évaluation des caractéristiques de performance des bâtiments existants en termes de :
1)   aspects techniques ;
2)   adaptabilité ;
3)   aptitude à l'usage ;
4)   aspects sociaux ;
5)   énergie, eau et impacts en exploitation ;
6)   qualité de l'environnement intérieur (y compris les aspects sanitaires) ;
7)   faisabilité économique ;
8)   résilience face au changement climatique ;
9)   impacts environnementaux intrinsèques.
Le document décrit le travail à effectuer dans les principales catégories applicables d’un processus en 6 étapes :
•   étape 0 : établissement du programme de l'objet de l'évaluation ;
•   étape 1 : évaluation du bâtiment ;
•   étape 2 : déconstruction contribuant au développement durable ;
•   étape 3 : processus de construction contribuant au développement durable ;
•   étape 4 : mise en service contribuant au développement durable ;
•   étape 5 : contribution au développement durable en cours d'utilisation.
NOTE   Dans le présent document, les utilisateurs désignent des personnes et des organisations qui utilisent le bâtiment, y compris les gestionnaires de l’installation. Dans certains bâtiments, les visiteurs sont également des utilisateurs importants et il est nécessaire de les prendre en compte.
Cette approche est générique pour tous les types de bâtiments. Le présent document ne couvre pas pour le moment les ouvrages de génie civil et ne fournit pas de valeurs de référence pour l’évaluation.

Trajnostnost gradbenih objektov - Ovrednotenje možnosti trajnostne prenove stavb

General Information

• Status: Not Published
• Publication Date: 08-Oct-2023
• ICS: 91.200 - Construction technology
• Technical Committee: CEN/TC 350 - Sustainability of construction works
• Drafting Committee: CEN/TC 350/WG 8 - Sustainable refurbishment
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 06-Jan-2023
• Due Date: 02-May-2022
• Completion Date: 06-Jan-2023
• Ref Project: oSIST prEN 17680:2021 - Sustainability of construction works — Evaluation of the potential for sustainable refurbishment of buildings

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 17680:2021
01-september-2021
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
Ta slovenski standard je istoveten z: prEN 17680
ICS:
13.020.20 Okoljska ekonomija. Environmental economics.
Trajnostnost Sustainability
91.040.01 Stavbe na splošno Buildings in general
oSIST prEN 17680:2021 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17680:2021
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oSIST prEN 17680:2021
DRAFT
EUROPEAN STANDARD
prEN 17680
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2021
ICS 91.200
English Version
Sustainability of construction works - Evaluation of the
potential for sustainable refurbishment of buildings
Nachhaltigkeit von Bauwerken - Bewertung des
Potentials zur nachhaltigen Sanierung von Gebäuden

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 350.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17680:2021 E

worldwide for CEN national Members.
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Contents Page

European foreword ............................................................................................................................................ 3

Introduction .......................................................................................................................................................... 4

1 Scope .......................................................................................................................................................... 7

2 Normative references .......................................................................................................................... 7

3 Terms and definitions ......................................................................................................................... 8

3.1 Definitions ............................................................................................................................................... 8

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 Planning the evaluation of the building...................................................................................... 18

5.3.1 Establishing the brief......................................................................................................................... 18

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 underlying information .... 19

5.3.5 Preparation of criteria for performance degree ..................................................................... 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 degree for inaccessible parts ........................................... 20

5.5 Analysis and evaluation process for sustainable refurbishment ...................................... 20

5.5.1 General.................................................................................................................................................... 20

5.5.2 Evaluating the building — step 1 .................................................................................................. 21

5.5.3 Sustainable deconstruction — Step 2 .......................................................................................... 25

5.5.4 Sustainable construction process — Step 3 .............................................................................. 27

5.5.5 Sustainable commissioning – step 4 ............................................................................................ 28

5.5.6 Sustainable in use – step 5 ............................................................................................................... 30

6 Reporting ............................................................................................................................................... 31

6.1 Content of report ................................................................................................................................. 31

6.2 Modelling of results and communication ................................................................................... 32

Annex A (informative) Example of classification of indicators in performance and

performance classes, from 1 – 4 .................................................................................................... 35

Bibliography ....................................................................................................................................................... 45

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European foreword

This document (prEN 17680:2021) has been prepared by Technical Committee CEN/TC 350/WG 8

“Sustainability of construction works - Evaluation of the potential for sustainable refurbishment of

buildings”, the secretariat of which is held by Standards Norway.
This document is currently submitted to the CEN Enquiry.
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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. 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. The transformation should be done in a cost-

effective manner and hence the refurbishment should be sustainable. 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 4. Although the assessment of technical and functional performance does

not form part of this series of standards, their interrelationship with environmental, social and economic

performance is prerequisite for an assessment of sustainability performance of buildings and is therefore

taken into account. This document, which define a simple method for qualifying the considerations to be

made in relation to evaluating the potential of refurbishing an existing building, to determine the most

sustainable and cost-effective approach to improve performance in line with regulatory requirements

among others. This is based on the assumption that in the large majority of cases refurbishment does

offer a more sustainable route to a sustainable building when compared with demolition and

reconstruction.

This document is primarily designed to support decision-makers to decide how to sustainably refurbish

existing building, and in some cases which buildings are sustainable for refurbishment taking into

consideration that not all buildings should be refurbished if the existing conditions of a building do not

permit.

This document is a part of the framework of standards for sustainability of buildings as shown in Figure 1

that draws upon information from the product and works level, as well as information on technical

characteristics, all to support the evaluation potential for refurbishment. This document, which defines a

simple method for qualifying the considerations to be made in relation to decide which buildings are

sustainable for refurbishment, also taking into consideration that not all buildings should be refurbished,

is a part of the framework standards for sustainability of buildings as shown in Figure 1.

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Figure 1 — Framework standards for sustainability of buildings

Refurbishment can be seen as an opportunity, not only to modernize a building’s appearance, but also to

enhance its overall technical - and functional (usability) performance.

All European countries face big challenges transforming the existing building stock to environmentally

and socially feasible buildings for the future with a low carbon societies and a higher focus on resource

efficiency.

The transformation should be done in a cost-effective manner and hence the refurbishment should be

sustainable. This standard gives a simple method for qualifying the considerations to be made in relation

to categorizing the existing building: which buildings to give first priority for a sustainable refurbishment

also taking into consideration that not all buildings should be refurbished.

It is a need for a simple method for qualifying the considerations to be made in relation to categorizing

the existing building: which buildings to give 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:

• Reduced landfill disposal
• Transportation costs and CO footprint
• Contribution extending whole building lifetime

• Reduced environmental footprint through greater reuse of materials, improved thermal and water

efficiency
• Contributing to lower life cycle costs
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• Improved health and well-being of occupants
• Embodied Impact
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 heritage for future generations
• Better adaptation to climate change (e.g. limiting the solar gain in summer)

Refurbishment can be seen as an opportunity, not only to modernize a building’s appearance, but also to

enhance its overall technical - and functional (usability) performance.
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1 Scope

This document provides a process for the evaluation of the potential for sustainable refurbishment of an

existing building, as a mean of contributing to the circular economy. This document gives guidelines to

assess performance of existing buildings in order to determine what to do in a set of alternatives:

Refurbish for similar or new use, use as is or sustainably deconstruct. Sustainable refurbishment aims to

close the gap between current performance and current requirements. It can be used for a building or

part(s) of a building, as well as a portfolio of buildings.
This document gives a method for assessing performance of existing buildings:
1) Technical (including energy) characteristics
2) Usability for users
3) Adaptability for changes
4) Indoor environment (health aspects)
5) Economic feasibility
6) Embodied environmental impacts

The document describes the work to be done in main applicable categories of a 5 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 organisations working in the building, including the facility

management. In some buildings visitors are also important users.

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.

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 – ore rules for product

category of construction products
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EN 15978-1, Sustainability of construction works - Methodology for the assessment of performance of

buildings - Part 1: Environmental Performance

EN 16309, Sustainability of construction works - Assessment of sosial performance of buildings - Calculation

metodology

EN 16627, Sustainability of construction works - Assessment of economic performance of buildings -

Calculation methods
EN 17037, Daylight in buildings
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological 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 Definitions
3.1.1
adaptability

ability of the object of assessments or parts thereof to be changed or modified to make suitable for a

particular purpose

Note 1 to entry: adaptability can be subdivided into function of flexibility, versatility and elasticity of the building,

part of or group of buildings
3.1.2
demand profile

set of parameters and their classes coming from regulations or the client’s brief as demand levels

Note 1 to entry: Example load bearing capacity, floor to ceiling height
3.1.3
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

Note 1 to entry: Example to add extra floor(s) or horizontal extension or remove part of a building

3.1.4
environmental aspect

aspect of construction works, part of works, processes or services related to their life cycle that can

change to environment
[SOURCE: EN 15643:2020]
3.1.5
environmental impact

result of a change to the environment, whether adverse, neutral or beneficial, wholly or partially resulting

from environmental aspects
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[SOURCE: EN 15643:2020]
3.1.6
environmental performance
performance related to environmental impacts and environmental aspects
[SOURCE: EN 15643:2020]
3.1.7
flexibility

adaptability related to changing space distribution within the existing building unit

Note 1 to entry: Example to change from cell offices to open landscape
3.1.8
functional performance

performance related to the functionality of a construction works or an assembled system (part of works),

which is required by the client, users or by regulations
[SOURCE: EN 15643:2020]
3.1.9
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: ISO 15686-10:2010]
3.1.10
functionality
suitability or usefulness for a specific purpose or activity
[SOURCE: EN 15643:2020]
3.1.11
versatility
adaptability related to changing the use of the building

Note 1 to entry: Example to change use from offices to school area or divide for different users (core business)

3.1.12
maintenance

combination of technical, administrative, and managerial actions during the service life intended to retain

construction works or parts of works in a state in which it can perform its required functions

[SOURCE: EN 15978]
3.1.13
maintenance (planed)

combination of planned technical, administrative, and managerial actions during the service life intended

to retain construction works or parts of works (functional units) in a state in which it can perform its

required functions
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Note 1 to entry: Preventive (planed) maintenance covers cleaning, servicing, lubrication, changing wearying parts,

testing, inspection, condition monitoring, done on a periodic basis and done before a failure would occur

3.1.14
performance profile
set of parameters and their classes coming from the actual object of assessment

Note 1 to entry: calculation methods as per 15978 - Sustainability of construction works - Assessment of

environmental performance of buildings - Calculation method, EN 16309 Assessment of Social Performance of

Buildings, and EN 16627 Assessment of Economic Performance of Buildings
3.1.15
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

3.1.16
refurbishment

large scale (substantial) modification and improvements to an existing building in order to bring it up to

an acceptable condition
[SOURCE: EN 15643:2020]

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

3.1.17
sustainable refurbishment

refurbishment to a condition that maximize the environmental, social and economic performance,

Note 1 to entry: Sustainable refurbishment shall fulfil authority’s sustainability regulations

Note 2 to entry: Sustainable refurbishment aims to fulfil UN Sustainable Development Goals relevant for the built

environment
3.1.18
renovation

upgrade of components, elements or systems including energy efficiency upgrading (technical

modernisation)

Note 1 to entry: This also applies when upgrading is required by e.g. changed regulations

3.1.19
repair

returning an item to an acceptable condition through the renewal, replacement or mending worm,

damaged or degraded parts
[SOURCE: EN 15643:2020]
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3.1.20
replacement

substitution of a whole construction product, building element or installation with the same or an

equivalent similar product, building element or installation in order to re-establish the required

functional and technical performance or to fulfil new regulations
[SOURCE: EN 15643:2020]

Note 1 to entry: Replacement of a component according to current requirement. Ex. replacing an old window, the

new one should be according U-value of today
3.1.21
re-use

any operation through which products that are not waste are used again for the same purpose for which

they were conceived or used for other purposes without reprocessing
[SOURCE: EN 15643:2020]
3.1.22
social aspect

aspect of construction works, assembled system (part of works), processes or services related to their

life cycle that can change to society or quality of life
[SOURCE: EN 15643:2020]
3.1.23
social impact

any change to society or quality of life, whether adverse or beneficial, wholly or partially resulting from

social aspects
[SOURCE: EN 15643:2020]
3.1.24
social performance
performance related to social impacts and social aspects
[SOURCE: EN 15643:2020]
3.1.25
sustainability assessment of buildings

combination of the assessments of environmental -, social -, economic -, usability - and adaptability

performance taking into account the technical and functional requirements
[SOURCE: EN 15643:2020]

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
3.1.26
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
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Note 1 to entry: a sustainable building aims to fulfil UN Sustainable Development Goals relevant for the built

environment
3.1.27
usability
extent to which a building, or part thereof, is suited for its purpose
3.1.28
user

persons or organization for which a building is designed (including owner, manager and occupants)

[SOURCE: adapted from definition in ISO 6707-1]

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)

3.1.29
well-being

balance between economy-, environmental – 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
3.2.1
VOC
Volatile organic compounds
3.2.2
TVOC
Total volatile organic compounds
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4 Sustainable refurbishment, general principles
Figure 2 — Decision methodology process

Starting point will be “What to do?” with the building, it is necessary to evaluate, 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 totally can only be

achieved if the building is not protected / listed or measures to be taken do not change building physic in

a negative way (ex.: insulation on inside may cause increase of humidity in wall / roof and possible rot or

freezing damages can be introduced).
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Figure 3 — Aim of sustainable refurbishment is to close the gap between existing performance

and ambition level of requirements.

For building owners, 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, 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 -, Environmental –

and Social aspects.

Plotting results of adaptability and usability into a matrix, see Figure 4, it is possible to see the options.

Aim of Sustainable refurbishment is to move buildings, part of a portfolio into a better zone, as shown in

Figure 4, by improving usability and adaptability. This guidance may also help to identify buildings with

poor usability and/or adaptability where this will not be possible to achieve within overall budget or

resource constraints.
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Arrow 1 moving from bad usability to usability due to good adaptability for same use

Arrow 2 moving from good usability to not when adaptability is needed but is not present

Arrow 3 moving from bad usability and bad adaptability to good usability to new use if possible

Figure 4 — Arrows show possible movement.

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

nuanced project with the view to meet future requirements with minimum environmental impact.

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a Requirement at construction time as new building
b Maintenance

c Renovation: Upgrading components, elements and systems including new energy efficiency upgrade

d Sustainable refurbishment: Renovation that also includes change space plan
Note 1: Fulfil new requirements on performance from core business

Note 2: In certain circumstances refurbishment measures may not reach sustainability requirements

Note 3: Requirements to space distribution and renovation and change of use
e Upgrading level: Practical level technical upgrade to today’s level.
f Sustainability performance: New demands related to sustainability performance
g Performance level of building without sustainable refurbishment
Figure 5 — Relation between renovation and refurbishment

The technical and functional requirements will indicate which parts may require maintenance,

renovation or refurbishment. This document enables us to develop a strategy for sustainable

refurbishment of the whole building, part of or
...