{"id":2105,"date":"2026-04-02T09:44:58","date_gmt":"2026-04-02T09:44:58","guid":{"rendered":"https:\/\/blog.imit.it\/?p=2105"},"modified":"2026-04-02T09:44:58","modified_gmt":"2026-04-02T09:44:58","slug":"requirements-decree-2025-what-changes-for-buildings-and-systems","status":"publish","type":"post","link":"https:\/\/blog.imit.it\/en\/news-en\/requirements-decree-2025-what-changes-for-buildings-and-systems\/","title":{"rendered":"Requirements Decree 2025: what changes for buildings and systems"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">As of <\/span><b>June 3, 2026<\/b><span style=\"font-weight: 400;\">, the new <\/span><a href=\"https:\/\/www.gazzettaufficiale.it\/eli\/id\/2025\/12\/05\/25A06487\/SG\"><b>Minimum Energy Performance Requirements Decree<\/b><\/a><span style=\"font-weight: 400;\"> (Ministerial Decree 28\/10\/2025) will come into force in Italy, significantly updating the regulatory framework for building energy performance, replacing and integrating the provisions of Ministerial Decree 26\/06\/2015.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This is a major update not only in terms of calculation methodologies, but also in the overall approach to energy design, with practical implications for Energy Performance Certificates (APE), technical reports (Italian \u201cLegge 10\u201d) and system design choices.<\/span><\/p>\n<h2><b>A more rigorous approach to energy performance<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The decree introduces more detailed evaluation criteria that are better aligned with the <\/span><b>actual behaviour of buildings<\/b><span style=\"font-weight: 400;\">.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Assessments become more structured and less simplified, with the aim of reducing the gap between theoretical performance and real results.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This leads to greater attention to both <\/span><a href=\"https:\/\/blog.imit.it\/en\/home\/building-materials-and-energy-savings-how-to-choose-during-new-construction-or-renovation\/\"><span style=\"font-weight: 400;\">envelope quality<\/span><\/a><span style=\"font-weight: 400;\"> and proper system integration, directly impacting overall energy performance.<\/span><\/p>\n<h2><b>Thermal bridges: more detailed assessments<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">One of the most significant updates is the explicit inclusion of thermal bridges within the reference building.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The decree provides for:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">a detailed assessment of the most common thermal bridges;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">the use of specific coefficients (\u03a8) differentiated by type and climate zone;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">alignment between the actual building geometry and the calculation model.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This approach allows for a more accurate representation of <\/span><a href=\"https:\/\/blog.imit.it\/en\/home\/heat-dispersion-mechanisms-issues-and-solutions-in-heating-systems\/\"><b>heat losses<\/b><\/a><span style=\"font-weight: 400;\">, affecting both design verification and energy classification.<\/span><\/p>\n<h2><b>Gross surfaces and revised parameters<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The new decree also explicitly establishes the use of <\/span><b>gross surfaces<\/b><span style=\"font-weight: 400;\"> as the basis for calculations.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This choice standardises application criteria and leads to a revision of performance limits, with effects on transmittance checks and overall building parameters.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">At the same time, reference values for the <\/span><a href=\"https:\/\/blog.imit.it\/en\/home\/building-materials-and-energy-savings-how-to-choose-during-new-construction-or-renovation\/\"><b>envelope<\/b><\/a><span style=\"font-weight: 400;\"> are updated and certain parameters\u2014such as the global heat transfer coefficient (H\u2019t)\u2014are redefined, with clearer distinctions between new buildings and renovation projects.<\/span><\/p>\n<h2><b>Updated calculation methodologies<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The decree introduces new technical references for energy performance calculations, including:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/store.uni.com\/uni-ts-11300-6-2016\"><b>UNI\/TS 11300-5 and 11300-6<\/b><\/a><span style=\"font-weight: 400;\">, relating to primary energy calculation and transport services (elevators, escalators);<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/store.uni.com\/uni-en-15193-1-2021\"><b>UNI EN 15193<\/b><\/a><span style=\"font-weight: 400;\"> for lighting energy demand.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In addition, the <\/span><a href=\"https:\/\/en.wikipedia.org\/wiki\/Carnot_cycle\"><b>Carnot method<\/b><\/a><span style=\"font-weight: 400;\"> is introduced for evaluating district heating and cogeneration systems, improving the representation of primary energy in complex systems.<\/span><\/p>\n<h2><b>Systems and control: new requirements<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The <\/span><a href=\"https:\/\/www.gazzettaufficiale.it\/eli\/id\/2025\/12\/05\/25A06487\/SG\"><span style=\"font-weight: 400;\">decree<\/span><\/a><span style=\"font-weight: 400;\"> strengthens the <\/span><a href=\"https:\/\/blog.imit.it\/en\/home\/efficiency-and-comfort-in-existing-systems-checklist-and-strategies\/\"><span style=\"font-weight: 400;\">role of building systems<\/span><\/a><span style=\"font-weight: 400;\">, particularly in terms of control and regulation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In non-residential buildings with thermal systems above 290 kW, the installation of building automation and control systems (BACS) of at least Class B, according to <\/span><a href=\"https:\/\/store.uni.com\/uni-en-iso-52120-1-2022\"><span style=\"font-weight: 400;\">UNI EN ISO 52120-1,<\/span><\/a><span style=\"font-weight: 400;\"> is required where technically and economically feasible.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Furthermore, in the case of generator replacement, the installation of <\/span><a href=\"https:\/\/blog.imit.it\/en\/home\/how-to-choose-the-ideal-room-thermostat-a-technical-guide-for-installers-and-professionals\/\"><b>temperature self-regulating devices<\/b><\/a><span style=\"font-weight: 400;\"> for each room is required, where applicable.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These provisions highlight the growing importance of system operation and control in achieving energy efficiency targets.<\/span><\/p>\n<h2><b>Electric mobility infrastructure<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The decree introduces more structured requirements for <\/span><b>integrating electric vehicle charging infrastructure<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These requirements apply to:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">new buildings;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">major renovations;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">certain existing non-residential buildings with parking areas.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Minimum numbers of charging points and infrastructure provisions are defined, along with progressive implementation timelines.<\/span><\/p>\n<h2><b>Greater focus on comfort and safety<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Among the most relevant updates is the introduction of more explicit guidance regarding:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">thermal and hygrometric comfort;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">indoor environmental quality;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">safety aspects, including fire safety and structural considerations.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Energy design is therefore framed within a broader concept of building quality and <\/span><a href=\"https:\/\/blog.imit.it\/en\/industry\/the-importance-of-safety-in-heating-systems-regulation-and-safety-thermostats\/\"><span style=\"font-weight: 400;\">safety<\/span><\/a><span style=\"font-weight: 400;\">, taking into account not only energy consumption but also real usage conditions.<\/span><\/p>\n<h2><b>Implications for design and renovation<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The new regulatory framework leads to several operational implications:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">greater accuracy in energy modelling;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">increased attention to envelope construction details;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">closer integration between building components and systems;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">the need to consider control as an integral part of the building-system interaction.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In renovation projects in particular, the updated verification methods require a more structured approach to performance evaluation.<\/span><\/p>\n<h2><b>The role of temperature control<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">In this context, <\/span><b>temperature control<\/b><span style=\"font-weight: 400;\"> becomes increasingly relevant.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Proper management of setpoints and operating cycles improves comfort stability and reduces energy consumption, supporting compliance with regulatory performance requirements.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The presence of <\/span><a href=\"https:\/\/blog.imit.it\/en\/home\/how-to-choose-the-ideal-room-thermostat-a-technical-guide-for-installers-and-professionals\/\"><span style=\"font-weight: 400;\">appropriate control systems<\/span><\/a><span style=\"font-weight: 400;\"> therefore becomes a functional element not only for compliance, but also for overall user experience.<\/span><\/p>\n<h2><b>IMIT\u2019s contribution<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Starting from 2026, designers, installers and industry professionals will be required to adopt a more integrated approach, where envelope, systems and control work together to achieve the desired performance.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Within this framework, <\/span><a href=\"https:\/\/www.imit.it\/\"><span style=\"font-weight: 400;\">IMIT<\/span><\/a><span style=\"font-weight: 400;\"> continues to develop solutions for system control and safety, supporting professionals and end users in achieving efficient temperature management.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The <\/span><a href=\"https:\/\/www.gazzettaufficiale.it\/eli\/id\/2025\/12\/05\/25A06487\/SG\"><span style=\"font-weight: 400;\">Minimum Energy Performance Requirements Decree 2025<\/span><\/a><span style=\"font-weight: 400;\"> represents a significant evolution of the regulatory framework, aimed at greater consistency between design, energy performance and actual building operation. In this scenario, <\/span><b>precise and reliable control<\/b><span style=\"font-weight: 400;\"> proves to be one of the most effective tools for translating regulatory requirements into measurable results, contributing to improved energy efficiency and long-term comfort.<\/span><\/p>\n<p><br style=\"font-weight: 400;\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As of June 3, 2026, the new Minimum Energy Performance Requirements Decree (Ministerial Decree 28\/10\/2025) will come into force in Italy, significantly updating the regulatory framework for building energy performance, replacing and integrating the provisions of Ministerial Decree 26\/06\/2015. This is a major update not only in terms of calculation methodologies, but also in the [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2103,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[20],"tags":[],"class_list":["post-2105","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Requirements Decree 2025: what changes for buildings and systems - IMIT Blog - condividiamo oltre 100 anni di esperienza<\/title>\n<meta name=\"description\" content=\"As of June 3, 2026, the new Minimum Energy Performance Requirements Decree (Ministerial Decree 28\/10\/2025) will come into force in Italy, significantly updating the regulatory framework for building energy performance, replacing and integrating the provisions of Ministerial Decree 26\/06\/2015.This is a major update not only in terms of calculation methodologies, but also in the overall approach to energy design, with practical implications for Energy Performance Certificates (APE), technical reports (Italian \u201cLegge 10\u201d) and system design choices.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.imit.it\/en\/news-en\/requirements-decree-2025-what-changes-for-buildings-and-systems\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Requirements Decree 2025: what changes for buildings and systems - 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