Planning conformity is frequently discussed in property sales and renovations, but its meaning and practical importance are not always clear to non-specialists. A property complies when its present condition corresponds exactly to the permissions and plans filed with the municipality over the years. Rooms, windows, volumes and every other element of the actual building must match the approved drawings.
A common, risky mistake is confusing planning conformity with cadastral conformity. An updated cadastral plan does not by itself establish building legality: the Cadastre primarily serves taxation and cannot certify planning compliance. If an earlier owner removed a partition to combine a kitchen and living room without filing the necessary municipal paperwork, the property may be non-compliant even if the cadastral plan shows the open-plan space. What matters legally is what the municipal technical office authorised.
Verification requires comparing the property’s present condition with its building history, reconstructed from municipal authorisations. Depending on the construction date, these may include older building licences, concessions, building permits, SCIA notifications, CILA communications and any previous regularisations. The principal legislative framework is Presidential Decree 380 of 6 June 2001, the Consolidated Building Act, which establishes the rules and authorisations for alterations to existing properties.
A qualified surveyor, architect or engineer should formally obtain the municipal records, retrieve original plans, inspect the premises and check for discrepancies. The review may reveal minor internal differences that are readily regularised, or more serious unlawful works requiring complex regularisation or restoration to the original condition.