Methodology for investigating cost-effective building renovation strategies at district level combining energy efficiency & renewables: Annex 75

Roman Bollinger, Jon Terés-Zubiaga, Manuela Almeida, Ricardo Barbosa, Henrik Davidsson, Kirsten Engelund Thomsen, Silvia Domingo-Irigoyen, Simone Ferrari, Erik Johansson, Thaleia Konstantinou, Roland Limacher, Tomáš Matuška, Erwin Mlecnik, Ove Christen Mørck, Walter Ott, Jørgen Rose, Piercarlo Romagnoni, Toivo Säwén, Harald Walnum, David VenusZeno Winkels

Research output: Book/ReportReportResearch


This report describes the methodology for identifying and assessing cost-effective strategies for renovating urban districts towards far-reaching objectives regarding reducing carbon emissions and energy use. The report proposes different scenarios considering boundary conditions and different interventions on building envelopes and thermal systems. The proposed methodology builds on the methodology previously developed for individual buildings in IEA EBC Annex 56 (developed by the same main authors of this report), extending it to the level of districts/groups of buildings. Furthermore, it also makes use of results from other related Annexes. The idea is that the methodology supports decision-makers in evaluating the efficiency, impacts, cost-effectiveness and acceptance of various strategies for renovating urban districts, and in identifying suitable renovation strategies.
The methodology defines the boundary conditions set for the assessments carried out, the research questions/hypotheses mainly investigated with the assessments, and the type of outputs generated from the assessments.
It is intended that, based on the methodology developed, existing tools can be identified, or existing tools can be adapted to support the application of the methodology in case-specific assessments. In addition, an online Calculation Tool (Annex 75 CT) was developed to support the application of this methodology, which is available at: and at
Original languageEnglish
PublisherUniversity of Minho
Number of pages47
ISBN (Electronic)978-989-35039-6-6
Commissioning bodyInternational Energy Agency (IEA)
Publication statusPublished - May 2023

Bibliographical note

All property rights, including copyright, are vested in the University of Minho, Operating Agent for EBC Annex 75, on behalf of the Contracting Parties of the International Energy Agency (IEA) Implementing Agreement for a Programme of Research and Development on Energy in Buildings and Communities (EBC). In particular, no part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the University of Minho.


  • energy efficiency
  • renewable energies
  • district
  • renovation
  • cost-effective
  • methodology


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