It updates the Ministerial Decree of 26 June 2015 by wholly replacing its Annex 1 — general criteria and energy-performance requirements — and Annex 2 — referenced technical standards. The 2015 decree remains the framework: what changes is the content read inside it. Published in Official Gazette, General Series no. 283 of 5 December 2025, it is fully operative from 3 June 2026 after a 180-day transitional period; for building titles applied for up to that date, Annex 1 in its 2015 version continues to apply.
It concerns the energy design of every building intervention: new construction, renovation, upgrading and works on existing buildings. It introduces no separate obligation: it rewrites the text designers already consulted — Annex 1 of the Ministerial Decree of 26 June 2015 — and the list of technical standards that text refers to. The watershed is the date the building title was applied for.
The distinction matters because it changes where you look. The 2015 decree has not been repealed: it remains the text implementing Legislative Decree 192/2005, setting out how a building's energy performance is calculated and which requirements it must meet. What changed is the content of its two annexes: Annex 1, carrying the general criteria and performance requirements, and Annex 2, listing the technical standards by which those calculations are performed. A citation to 'Annex 1 of the Ministerial Decree of 26 June 2015' remains formally correct, yet today it points to a different text than it did yesterday.
The new Annex 1 aligns the definition of thermal bridge with UNI EN ISO 10211 and tightens its treatment in the envelope checks, starting with the mean overall heat-transfer coefficient by transmission. It is a change felt in design before it is felt on site: it shifts the weight from insulation thickness alone to the continuity of the insulating layer at the junctions — ground connections, balconies, window openings, roofs — which is exactly where thermal bridges form.
| Part | Contains | What changed |
|---|---|---|
| Annex 1 | General criteria and energy-performance requirements | Wholly replaced: definitions, envelope checks, requirements on automation and on charging infrastructure |
| Annex 2 | Technical standards referenced for calculation | Updated: among others, Parts 5 and 6 of UNI/TS 11300 and UNI EN 15193 for lighting in non-residential buildings |
| Articles | Provisions amending the 2015 decree | They act on definitions, calculation methodologies and references to technical standards |
The new Annex 1 brings to the centre three themes that used to sit at the margins. Room-by-room control and consumption metering become ordinary elements of a renovation rather than virtuous options; building automation and control systems — BACS — enter the requirements instead of remaining a recommendation. Electric-vehicle charging has a chapter of its own, with requirements distinguished between residential and non-residential buildings and a new definition, the 'parking area adjacent to the building', which serves to establish when the obligation is triggered.
What is described here is the structure and logic of the measure, not its values. The numerical thresholds are read in the text published in the Official Gazette, which is free and openly available: the link is at the foot of the page. The technical standards referenced by Annex 2 — UNI/TS 11300, UNI EN ISO 10211, UNI EN 15193 — are instead copyright-protected and sold: their role is described here, never their content.
Yes. It has not been repealed: it remains the decree implementing Legislative Decree 192/2005. What were replaced are its Annexes 1 and 2, the technical part actually consulted. Citing 'the Ministerial Decree of 26 June 2015' is still correct today, but the version of the annexes must be stated.
It depends on the date the building title was applied for. Up to 3 June 2026 the rules of the old Annex 1 apply, even if the works continue afterwards; for titles applied for from that date onwards the new annexes apply.
Because the measure provides a 180-day transitional period from publication in the Official Gazette, which took place on 5 December 2025. The 180 days expire on 3 June 2026: that is the date from which the decree is fully operative.
For files falling under the new annexes, yes: the technical standards referenced by Annex 2 are updated, and a calculation engine still on the earlier versions does not produce the checks required.