NTC 2018 — Norme Tecniche per le Costruzioni
Approved by the ministerial decree of 17 January 2018, these govern structural design including actions on structures and requirements for construction materials. Snow, wind and seismic actions are assessed for your specific site — there is no single Italian value, and anyone quoting as if there were has not done the check.
Permitting depends on your comune
Whether your work is a free building activity, a notified work or requires a full permit depends on whether the structure, the form, the volume, seismic compliance or a protected status is affected. We check the comune, the region, the seismic zone and any landscape or heritage constraint before quoting. We will never tell you nationally that "no permit is needed".
Energy requirements — the requisiti minimi, updated for 2026
Roof insulation is an intervention on the opaque horizontal or inclined envelope, so its thermal transmittance is controlled. The limits changed recently: the ministerial decree of 28 October 2025 replaced the annexes of the 2015 decree with effect from 3 June 2026. For a roof being renovated the U-value ceiling now runs from 0.32 W/m²K in the warmest climate zones to 0.22 in the coldest. Two exemptions are worth knowing: a roof over an unheated loft is not part of the building envelope and is not subject to the requirements at all, and laying a waterproofing layer without demolishing the finish below it is likewise outside them.
Landscape authorisation — DPR 31/2017, and the line that decides it
The cleanest rule in Italian law for roofing: replacing a covering with the same materials and finishes is excluded from landscape authorisation entirely, as is insulation that adds nothing projecting beyond the roof profile. Replacing the covering with different materials, changing the pitch, adding rooflights, dormers or flues, or altering the roof to take equipment, all require the simplified authorisation — which the code caps at 60 days. Fall-arrest anchor lines are always exempt. Annexes A and B were amended with effect from 27 May 2026, so a summary written before that date is out of date.
Which title your works need — and often, none at all
The official glossary of free building activity lists “manto di copertura — repair, renewal, replacement respecting the existing typological characteristics and materials, including related works such as the insertion of insulating layers”. A like-for-like reroof with added insulation therefore needs no title. A full covering replacement that does not touch the structure is a CILA; replacing trusses or beams, or changing the covering type or appearance, is a SCIA; adding volume needs a building permit.
Civil code liability — articles 1667 and 1669
Article 1667 covers contractor liability for defects, with defects generally to be notified within 60 days and a two-year limitation from handover. Article 1669 establishes a distinct ten-year liability for collapse, risk of collapse and serious defects in durable immovable works. This statutory protection matters far more to you than any advertised product guarantee.
CAM — Criteri Ambientali Minimi
The minimum environmental criteria matter for public and institutional procurement. The current decree dates from November 2025 and has applied since 2 February 2026. They are not automatically a mandatory regime for a private house, and we do not pretend otherwise in order to sell a specification.
Site compliance you will be asked about
Since October 2024 every contractor and self-employed worker on a temporary or mobile site needs a patente a crediti, starting at 30 credits and requiring at least 15 to keep working. Separately, private works of €70,000 or more trigger the DURC di congruità, which tests whether the labour content of the job is plausible — for a renovation the benchmark is 26% of the works value — and is normally required before final payment. A €30,000 roof is below that threshold; a €100,000 one is not.