ALDREN is a methodological framework to support decision-making and investment in deep energy renovation of non-residential buildings. It is voluntary and provides consistent sustainability metrics to improve certification of energy and IEQ performance. ALDREN could be used as a whole, but also in a modular approach by each stakeholder of the renovation implementation chain. It is built to ensure consistent information sharing between stakeholders depending on their needs: a common language.

ALDREN’s framework is holistic, harmonized, and modular: it is based on a set of procedures (modules) that consist in implementing step-by-step operational protocols to assess the energy performance, Indoor Environmental Quality (IEQ, related to health & well-being) and financial value of buildings before and after energy renovation. ALDREN protocols rely on simulations and measurements based on best practice and the consistent use of CEN and ISO standards to ensure transparency and quality. ALDREN is also the first integrated common framework for deep renovation that is based on these standards.

ALDREN is a methodological framework that implements the EVCS, with 4 standalone modules and 2 reporting tools (EVC and BRP).


Energy rating & target

A consistent, harmonized, unique European energy performance rating, based on ISO/CEN standards, offering comparability and transparency across the EU to provide a common metrics and highlight the quality for financial instruments connected with renovation. A rating scale with classes from A-G has been defined to compare and identify in priority the buildings fitting best for deep renovation and to evaluate the impact of renovation actions on energy performance.

Energy verification

An energy Performance verification framework allowing actual (measured) performance to be compared with simulated (predicted) performance. It encompasses a “Design for Performance” protocol that sets out and tracks the actions required during the deep renovation process. It also includes a “Performance Verification Tool” (PVT) to compare predicted and actual performance at different levels of granularity.

Comfort & well-being

A health and well-being assessment protocol. It is based on an index called ALDREN-TAIL to rate the Indoor Environment Quality (IEQ) of buildings undergoing deep renovation, focusing on 4 key components: Thermal environment (T), Acoustic environment (A), Indoor air quality (I), Luminous environment (L). TAIL ratings can and should be evaluated before and after renovation.

Cost, value, and risk

A protocol to evaluate impacts of energy and non-energy benefits associated with deep renovation on the financial value and risks of office and hotel buildings. The information and sustainability metrics provided by the 3 previous modules and the Renovation Roadmap of the ALDREN BRP (see below) is shared with financial valuation experts who compare the financial impacts – costs, risks and value – associated with different renovation scenarios.


EVC: European Voluntary Certificate

The EVC provides a synthesis of a building’s energy performance and a summary of the main renovation actions to be undertaken. The EVC is ALDREN’s back-bone that supports the implementation of a European Voluntary Certification Scheme (EVCS) introduced in Article 11(9) of the EPBD.

EVC+: European Voluntary Certificate Plus

The EVC+ is the EVC with the addition of several sections to describe the actual (measured) energy performance, IEQ (TAIL-index about health & well-being) and to analyse the impacts of proposed energy renovation actions on financial value.

BRP, Building Renovation Passport

The ALDREN Building Renovation Passport (BRP) is a dynamic instrument to be used and updated over time along the renovation path to deep renovation. It includes a “LogBook” where comprehensive collected data better informs building owners and managers about the current technical energy, Indoor Environmental Quality (IEQ), and financial performance status of their building and a tailored Renovation Roadmap or “RenoMap” with one or multiple steps to reach high energy performance in the medium to long term.


This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 754159. The information in this publication does not necessarily represent the view of the European Commission.
© ALDREN. All rights reserved. Any duplication or use of objects such as diagrams in other electronic or printed publications is not permitted without the author’s agreement.


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