{"id":25777,"date":"2026-07-16T14:06:44","date_gmt":"2026-07-16T14:06:44","guid":{"rendered":"https:\/\/domidea-ristrutturazioni.it\/senza-categoria\/system-certification-why-it-is-important-and-what-it-is-for\/"},"modified":"2026-07-16T14:07:13","modified_gmt":"2026-07-16T14:07:13","slug":"system-certification-why-it-is-important-and-what-it-is-for","status":"publish","type":"post","link":"https:\/\/domidea-ristrutturazioni.it\/en\/senza-categoria\/system-certification-why-it-is-important-and-what-it-is-for\/","title":{"rendered":"System certification: why it is important and what it is for"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">When undertaking a <a href=\"https:\/\/domidea-ristrutturazioni.it\/en\/turnkey-home-renovation\/\">home renovation<\/a>, attention often focuses on finishes, space distribution, and energy efficiency. An equally important but often underestimated aspect concerns <strong>the technical documentation of the systems<\/strong>. <\/p>\n\n<p class=\"wp-block-paragraph\">Certifications represent <em>proof that the systems have been built according to current regulations and comply with the safety requirements provided<\/em> by law.<\/p>\n\n<p class=\"wp-block-paragraph\">This is not a mere bureaucratic formality. <em>Certifications affect the safety of the property, its marketability, the ability to obtain permits, and the protection of the owner<\/em> in the event of accidents or disputes. <\/p>\n\n<h2 id=\"h-certificazioni-degli-impianti-cosa-sono-e-quale-funzione-svolgono\" class=\"wp-block-heading\">System certifications: what they are and what function they perform<\/h2>\n\n<p class=\"wp-block-paragraph\">In common parlance, people often speak of &#8220;system certification,&#8221; but the main document required by Italian law is the Declaration of Conformity (Di.Co.), governed by Ministerial Decree 37\/2008.<\/p>\n\n<p class=\"wp-block-paragraph\">Upon completion of the work, <strong>the licensed installation company must issue a declaration to the client<\/strong> certifying that the system has been built to the highest standards, in compliance with applicable technical standards and the safety requirements provided by law.<\/p>\n\n<p class=\"wp-block-paragraph\">The documentation normally includes:<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 declaration of conformity;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 system design project, when required;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 diagram of the installed system;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 list of materials used;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 documentation relating to the installation company.<\/p>\n\n<p class=\"wp-block-paragraph\" id=\"h-le-certificazioni-attestano-che-l-impianto-e-stato-progettato-e-realizzato-secondo-le-prescrizioni-normative-applicabili-verificandone-la-rispondenza-agli-standard-di-sicurezza-richiesti\">Certifications attest that the system has been designed and built according to applicable regulatory requirements, verifying its compliance with the required safety standards.<\/p>\n\n<h2 id=\"h-la-normativa-di-riferimento-nel-2026\" class=\"wp-block-heading\">Reference regulations in 2026<\/h2>\n\n<p class=\"wp-block-paragraph\">The main regulation remains Ministerial Decree 37\/2008, updated over the years to adapt to technological evolution and the new system requirements of buildings. The decree regulates the design, installation, transformation, expansion, and maintenance of systems serving buildings. <\/p>\n\n<p class=\"wp-block-paragraph\">The fundamental principle is clear: systems must be built by licensed companies and must be accompanied by documentation certifying their conformity with current technical standards.<\/p>\n\n<p class=\"wp-block-paragraph\">The lack of documentation can create problems during the sale process, requests for certificates of occupancy, building permits, and subsequent maintenance or expansion work.<\/p>\n\n<h2 id=\"h-quali-impianti-devono-essere-certificati\" class=\"wp-block-heading\">Quali impianti devono essere certificati<\/h2>\n\n<p class=\"wp-block-paragraph\">The obligation applies to various categories of systems installed in residential and commercial buildings:<\/p>\n\n<h3 id=\"h-dichiarazione-di-conformita-dell-impianto-elettrico\" class=\"wp-block-heading\">Declaration of conformity for the electrical system<\/h3>\n\n<p class=\"wp-block-paragraph\">The electrical system is probably the best-known case. The electrical system declaration of conformity is issued after the installation of a new system or following interventions that substantially modify its characteristics and functionality. <\/p>\n\n<p class=\"wp-block-paragraph\">The documentation certifies that the system has been built according to applicable CEI standards and that it meets the safety requirements provided by the regulations.<\/p>\n\n<p class=\"wp-block-paragraph\">The conformity of electrical systems takes on particular importance in full renovations, when switchboards, lines, protections, and safety devices are replaced.<\/p>\n\n<h3 id=\"h-certificazione-dell-impianto-a-gas\" class=\"wp-block-heading\">Gas system certification<\/h3>\n\n<p class=\"wp-block-paragraph\">Systems intended for the distribution and use of gas must also be accompanied by specific conformity documentation.<\/p>\n\n<p class=\"wp-block-paragraph\">Gas system certification is fundamental because it concerns systems that, in the event of defects or incorrect installations, can involve very high risks, such as gas leaks, fires, or explosions.<\/p>\n\n<p class=\"wp-block-paragraph\">For this reason, the regulations impose rigorous checks and the issuance of documentation by licensed companies.<\/p>\n\n<h3 id=\"h-impianti-idrico-sanitari\" class=\"wp-block-heading\">Plumbing and sanitary systems<\/h3>\n\n<p class=\"wp-block-paragraph\">The obligation also includes domestic water distribution systems, drains, and plumbing networks within buildings.<\/p>\n\n<p class=\"wp-block-paragraph\">During a <a href=\"https:\/\/domidea-ristrutturazioni.it\/en\/\">complete renovation<\/a> of the bathroom or kitchen, interventions involving the replacement of the networks normally require the issuance of a declaration of conformity for the work performed.<\/p>\n\n<h3 id=\"h-impianti-termici-e-di-climatizzazione\" class=\"wp-block-heading\">Heating and air conditioning systems<\/h3>\n\n<p class=\"wp-block-paragraph\">Boilers, heat pumps, air conditioning systems, and centralized or independent heating systems are subject to the provisions of Ministerial Decree 37\/2008.<\/p>\n\n<p class=\"wp-block-paragraph\" id=\"h-la-certificazione-assume-particolare-importanza-anche-ai-fini-dell-efficienza-energetica-e-della-corretta-gestione-degli-impianti-nel-tempo-inoltre-quando-gli-interventi-rientrano-tra-quelli-agevolabili-fiscalmente-ad-esempio-tramite-l-ecobonus-la-documentazione-tecnica-degli-impianti-puo-essere-necessaria-per-accedere-alle-detrazioni\">Certification also takes on particular importance for energy efficiency and the correct management of systems over time. Furthermore, when the interventions qualify for tax incentives, such as the <a href=\"https:\/\/domidea-ristrutturazioni.it\/en\/tax-deductions-incentives\/home-bonus-2026-all-incentives-for-renovating-and-improving-home-efficiency\/\">Ecobonus<\/a>, the technical documentation of the systems may be necessary to access the deductions. <\/p>\n\n<h3 id=\"h-certificazione-degli-impianti-fotovoltaici\" class=\"wp-block-heading\">Photovoltaic system certification<\/h3>\n\n<p class=\"wp-block-paragraph\">Certification of photovoltaic systems is necessary to attest to the correct installation of the system, compliance with applicable technical standards, and the safety of the connection to the building&#8217;s electrical grid.<\/p>\n\n<p class=\"wp-block-paragraph\">The documentation is also indispensable for many administrative, insurance, and grid connection procedures.<\/p>\n\n<h2 id=\"h-quando-la-certificazione-e-obbligatoria-durante-una-ristrutturazione\" class=\"wp-block-heading\">When certification is mandatory during a renovation<\/h2>\n\n<p class=\"wp-block-paragraph\">One of the most frequent questions concerns when it is necessary to obtain the documentation.<\/p>\n\n<p class=\"wp-block-paragraph\">Generally speaking, the declaration of conformity <strong>is mandatory when a new system is installed<\/strong> or when interventions are carried out that significantly modify its structure, operation, or technical characteristics.<\/p>\n\n<p class=\"wp-block-paragraph\">Common cases include:<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 complete rewiring of the electrical system;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 full replacement of the gas system;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 installation of a new air conditioning system;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 installation of a heat pump;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 installation of a photovoltaic system;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 significant expansions of existing systems;<\/p>\n\n<p class=\"wp-block-paragraph\">\u00b7 transformations involving substantial changes to the original configuration.<\/p>\n\n<p class=\"wp-block-paragraph\">Upon completion of the work, the contractor must deliver the documentation to the owner or the client.<\/p>\n\n<h2 id=\"h-cosa-succede-se-la-certificazione-manca\" class=\"wp-block-heading\">What happens if the certification is missing<\/h2>\n\n<p class=\"wp-block-paragraph\">The absence of documentation does not automatically mean that the system is dangerous, but it creates a situation of technical and legal uncertainty.<\/p>\n\n<p class=\"wp-block-paragraph\">In the event of a property sale, the buyer may request information on the available documentation. Furthermore, the absence of certifications can complicate subsequent interventions, building permits, and insurance claims. <\/p>\n\n<p class=\"wp-block-paragraph\">When the original declaration is not available and the conditions provided by the regulations are met, it may be possible to use a Declaration of Suitability (Di.Ri.), a tool that can be used for certain categories of systems built in specific historical periods and subjected to technical verification by qualified professionals.<\/p>\n\n<h2 id=\"h-impianti-certificati-un-valore-aggiunto-per-l-immobile\" class=\"wp-block-heading\">Certified systems: added value for the property<\/h2>\n\n<p class=\"wp-block-paragraph\">The presence of certified systems is not just a regulatory requirement.<\/p>\n\n<p class=\"wp-block-paragraph\">For the owner, it means being able to demonstrate that the systems were built by qualified operators and according to the required technical standards. For a potential buyer, it constitutes an additional guarantee of the quality of the property. <\/p>\n\n<p class=\"wp-block-paragraph\">In a real estate market increasingly attentive to technical and energy aspects, the availability of complete documentation can help simplify a sale and reduce the risk of future disputes.<\/p>\n\n<h2 id=\"h-perche-conservare-sempre-la-documentazione-degli-impianti\" class=\"wp-block-heading\">Why you should always keep system documentation<\/h2>\n\n<p class=\"wp-block-paragraph\">One of the most common mistakes is losing or failing to correctly archive the documentation received at the end of the work.<\/p>\n\n<p class=\"wp-block-paragraph\">Certifications should be kept together with the other technical documents of the property, such as building permits, energy certifications, and maintenance manuals.<\/p>\n\n<p class=\"wp-block-paragraph\">Having the documentation readily available can be essential in the event of subsequent renovations, requests from the Municipality, insurance procedures, rentals, or sales.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Certifications are a fundamental part of a home renovation: they prove that the systems have been built according to current regulations and meet the safety requirements provided by law.<\/p>\n","protected":false},"author":6,"featured_media":25775,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[61,1],"tags":[],"class_list":["post-25777","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-consigli-guide","category-senza-categoria"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Electrical, gas, and water system certification | Domidea<\/title>\n<meta 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