Directive (EU) 2024/1275, commonly referred to as EPBD 2024 or the recast EPBD, entered into force on 28 May 2024 following publication in the Official Journal of the European Union on 8 May 2024 (reference DOUE-L-2024-80664), according to EUR-Lex. Member States are required to complete transposition into national law by 29 May 2026. According to the European Commission Directorate for Energy, failure to meet that deadline exposes Member States to infringement proceedings. The directive repeals and replaces the previous versions of the EPBD, specifically Directive 2010/31/EU and its 2018 amendments, and sets a central objective of achieving a fully decarbonised EU building stock before 2050. For engineering teams and asset managers operating across the EU, the compliance landscape is not a single event but a structured sequence of obligations, each with its own technical requirements, documentary standards, and enforcement mechanisms. | The directive's architecture rests on several interconnected instruments: harmonised energy performance certificates (EPCs), renovation passports, solar readiness requirements for new buildings, smart readiness indicators (SRI), and whole-life carbon assessment through life cycle analysis (LCA). These instruments do not operate in isolation. They reference and reinforce one another, which means that a weakness in any one element, for example an EPC that does not conform to the Annex V template, can compromise compliance across the broader regulatory chain. Understanding each element individually and in combination is therefore essential for any organisation managing or developing built assets in the EU. | Regarding the state of national transposition, Spain provides a useful case study for the pace at which Member States are adapting. According to BUILD UP, the European Commission platform for energy efficiency in buildings, an analysis of implementation in Spain indicated that the country had reached approximately 60% adaptation around the May 2026 transposition deadline. This means that a significant proportion of the technical and administrative obligations derived from the directive still required specific regulatory development or updating of existing national instruments. The Spanish regulatory framework for buildings rests on instruments including the Codigo Tecnico de la Edificacion (CTE), the Reglamento de Instalaciones Termicas en los Edificios (RITE), and the energy certification royal decrees. According to MITECO, the Spanish government's institutional page for building energy efficiency, some measures in the directive were already aligned with existing Spanish regulations, whilst others, particularly renovation passports and LCA requirements, require additional regulatory development. This pattern of partial alignment is likely to be observed in other Member States as well, and engineering teams advising clients on compliance should not assume that existing national frameworks are fully sufficient. | The most immediately visible change introduced by EPBD 2024 concerns energy performance certificates. According to BUILD UP, from 29 May 2026 all EPCs must use the A-to-G scale and the harmonised template defined in Annex V of the directive. The purpose of this standardisation is twofold: to enable meaningful comparability of building assets across the EU, and to provide more actionable guidance on recommended improvement measures. In Spain, the current EPC framework under Royal Decree 390/2021 already introduced the A-to-G scale. However, Directive (EU) 2024/1275 adds further requirements to EPC content, including information on global warming potential from embodied carbon, the smart readiness indicator (SRI) reflecting a building's capacity to interact intelligently with energy networks, and integration with the renovation passport. These additions require updates to the inspection, calculation, and registration procedures currently managed by Spain's regional governments (comunidades autonomas), which hold competence over certification registries. For building typologies with complex mechanical and electrical systems, including large healthcare facilities and educational estates, accurate modelling of the revised EPC indicators is particularly critical to meeting deadlines and avoiding administrative penalties. | The renovation passport is one of the most substantive innovations introduced by EPBD 2024. According to MITECO, Member States are required to establish a renovation passport scheme based on Annex VIII of the directive, with a deadline of 29 May 2026. A renovation passport is not a snapshot of a building's current energy condition. It is a personalised document that sets out a staged, deep renovation roadmap for a specific building, with the objective of reaching the highest feasible energy efficiency level, ideally nearly zero-energy building (NZEB) standard or better. Each stage in the roadmap includes estimated energy savings, approximate costs, and a recommended sequence of interventions. This structure allows asset owners to plan capital investment in phases, reducing the risk of stranded assets and improving access to public funding mechanisms. In the Spanish context, relevant funding frameworks include the Plan de Recuperacion, Transformacion y Resiliencia (PRTR) and the EU Recovery and Resilience Mechanism. The technical rigour required to produce a credible renovation passport is substantial. It demands a detailed energy model of the existing building, scenario analysis across different improvement pathways, estimation of both embodied and operational carbon, and coordination with regional certification registries. Digital twin engineering tools provide the model base from which those comparative simulations can be run before any capital is committed. | On solar energy integration, the directive establishes specific obligations for new buildings. According to MITECO, in the Spanish implementation guidance for the directive, all new public and non-residential buildings with a usable floor area exceeding 250 square metres must have solar installations in place before 31 December 2026, provided this is technically and economically feasible. This obligation extends progressively to other building categories in subsequent phases. In Spain, this requirement overlaps with existing provisions in CTE DB HE (the Basic Document on Energy Saving), which since its 2019 revision has set minimum solar contribution thresholds. EPBD 2024 raises the baseline and makes compliance mandatory within tighter timeframes, treating solar energy infrastructure as a default design element rather than an optional measure. For projects involving energy generation and distribution infrastructure, this convergence between building regulation and energy regulation creates a more complex technical coordination requirement across mechanical, structural, and planning disciplines. | Looking beyond the 2026 milestone, according to BUILD UP the first binding requirements for life cycle assessment (LCA) will apply to large buildings from 2028, extending to all new buildings in 2030. LCA in the EPBD framework measures global warming potential across the entire building life cycle, covering construction materials, operational phase, and demolition, expressed in kilograms of CO2 equivalent per square metre per year. Projects currently in design for large-footprint buildings therefore need to incorporate LCA methodologies into their technical documentation now, in order to be compliant when those requirements take effect. Integrating LCA into BIM models, following information management protocols such as those described in ISO 19650, is the most efficient route to ensuring that documentation remains coherent, traceable, and updatable across the asset's lifetime. This is particularly relevant for industrial and manufacturing facilities, where buildings combine high technical density with floor areas that frequently exceed the thresholds at which the most demanding obligations apply. Additionally, according to the European Commission Directorate for Energy, Member States are required to submit their final national building renovation plans before 31 December 2026. Those plans must quantify the existing building stock, set decade-by-decade renovation targets, and identify associated financing measures, thereby establishing the priority framework against which national and European funding calls will be aligned. | The practical implications for building owners and engineering teams are multiple and concurrent. EPCs issued before May 2026 may require revision if they do not conform to the Annex V format, particularly in property transactions occurring after that date. Building owners with renovation plans should assess whether requesting a renovation passport is more advantageous than commissioning isolated retrofit measures, given that the passport may be a prerequisite for access to certain public financing lines. New-build projects exceeding 250 square metres in public or non-residential use must assess solar installation feasibility from the earliest design stages, with any claimed exemptions properly documented. Engineering teams working on large buildings should already be incorporating LCA procedures into their workflows to be prepared for the 2028 requirements. Furthermore, energy audits conducted under existing national frameworks, such as Spain's Royal Decree 56/2016 transposing Directive 2012/27/EU on energy efficiency and requiring large enterprises to conduct audits every four years, must be coherent with the new EPBD 2024 indicators, in particular global warming potential and the SRI. The regulatory picture resulting from EPBD 2024, layered over existing national instruments, constitutes a compliance environment with multiple active deadlines running simultaneously and with technical requirements that span disciplines from energy modelling to structural specification and procurement. Engineering teams advising clients on asset strategy, whether for existing portfolios or new development, need to treat these obligations as interconnected rather than sequential. The organisations best positioned to meet these requirements are those that have already embedded structured information management, model-based analysis, and cross-disciplinary coordination into their standard project workflows.