The lawful planning status of a property

For as long as the check remained implicit, the professional assumed the existing building was regular and concentrated the work on the design. Introducing a statutory concept of lawful status moved that check to the centre, with two effects.

The first is procedural: the review of a consent for work on an existing building checks that the design is grafted onto a regular situation, and the designer's declaration does not perform that function if the consents are not produced. The review checks that the design grafts onto a lawful existing condition.

The second is contractual: non conformity affects marketability and the declarations made in transfer deeds, and reconstructing lawful status has entered notarial practice as a preliminary check. Non conformity affects marketability and the declarations made on completion.

Article 9-bis of the consolidated building code defines lawful status and identifies the evidence establishing it. The provision was amended by Decree Law 69 of 2024, converted by Law 105 of 2024, which intervened substantially in this area.

The scheme is documentary rather than descriptive: lawful status is not established by a survey, it is established by consents. A survey, however careful, does not establish lawfulness.

The ordinary evidence consists of the consent that provided for the construction of the property or that subsequently legitimised it, together with the later consents authorising works on the same building. Later consents legitimating modifications are added to it.

The 2024 amendment articulated that scheme, providing for evidence by reference to the consent governing the last building work affecting the whole building or the whole unit, supplemented by consents relating to later partial works. The modes of proof were differentiated by period.

The stated rationale for this development is to facilitate the circulation of property, preventing an untraceable remote consent from blocking transactions on buildings that are substantively regular. Its actual scope is being clarified by case law and by ministerial guidance, and should be checked against the text in force.

One case affecting a substantial share of Italian building stock is that of buildings constructed at a time when a building consent was not required. For those, proof follows rules of its own.

For these situations the rules provide different means of proof, based on documentation capable of establishing the date of construction and the extent of the building. Professional practice draws on first registration land registry records, historic mapping and aerial photogrammetry and other documents with evidential value.

One point that practice tends to simplify should be emphasised. Establishing the date of construction is not the same as establishing the lawfulness of every subsequent intervention. A building predating the consent requirement may have been altered at a time when consent was required, and for those alterations the evidential burden is full.

Reconstruction is archive work before it is survey work, and the sources are of different kinds. The sources are of different kinds and must be searched separately.

Source	What it yields	Limit to know
Municipal building archive	Consents issued, approved drawings, any enforcement measures	Frequent gaps for earlier decades
Land registry archive	Plans filed over time, with dates of variation	Has no status as a building consent
Historic mapping and aerial photogrammetry	Dating of the built extent	Limited precision on internal alterations
Heritage authority archive	Authorisations on listed properties	Covers protected properties only
Competent regional seismic body	Structural filings and authorisations	Rules and record keeping vary by region
Deeds and title documentation	Planning declarations made on earlier transfers	Recognitive rather than constitutive value

Access to municipal records follows the rules on documentary access and takes time that must be built into programming. This is the main reason the search should be started before rather than during a building procedure.

This is the point where misunderstanding is most frequent and most costly. It concerns the relationship between the land registry and planning.

A land registry plan is not a building consent, and its correspondence with the existing condition does not establish the planning lawfulness of the property. The two checks are distinct, answer to different rules and must both be carried out.

The typical case is a property whose land registry plan was updated following an internal alteration carried out without a building consent. Land registry consistency is perfect and planning lawfulness is entirely absent.

The mirror case exists and is less well known: a property regular in building terms whose land registry plan was not updated after approved work. There land registry consistency is missing and lawful status is intact.

Reconstructing lawful status is a service with a cost and a duration, and underestimating both is why it is often skipped. Underestimating them is the quickest way to compromise the outcome.

The time depends almost entirely on archive access. A request for access to municipal records follows its own time limits, which must be factored into programming, and on properties with many consents consultation takes several visits. The historic land registry search is quicker but yields less.

The cost depends on the number of consents to trace and on how well the archive has been kept. On a property with an original consent and one later refurbishment the search is contained; on a stratified twentieth century building it can take weeks.

The consequence for the professional proposal is that reconstruction should be quoted as a separate service rather than implicitly included in the design appointment. Including it without having quoted it means assuming an open ended duration risk on a fixed fee.

One point of sequence closes this. The search should be started before the survey rather than after, because it is the consents found that indicate which elements the survey must check with particular care. A survey carried out before the search measures everything with equal attention and misses what matters.

Reconstruction is formalised in a report, and its usefulness depends on structure more than on length. Its usefulness depends on structure more than on length.

The chronology of consents, in date order, with the type of consent, its number, date and the works approved, forms the backbone of the document. Each entry carries the number, the date and the subject matter.

The comparison between the approved state and the surveyed state, conducted element by element rather than as an overall judgement, forms its body. Every departure identified must be described, dated so far as possible and referred back to the relevant consent.

Classification of each departure closes the document: difference falling within tolerances, regularisable non conformity, non regularisable non conformity. It is this section that guides the decisions to follow, and its absence turns the report into an inventory rather than an instrument.

Finally, the documentation consulted and that not traced should be stated, identifying the archives interrogated. A report that does not state the limits of the search cannot be verified by third parties.

Assuming regularity in the absence of consents is the first, and turns a hypothesis into a certification. A hypothesis is thereby turned into a certification.

Confusing land registry consistency with planning lawfulness is the second, and is the error producing the greatest number of transactions blocked at completion. It is the error producing the greatest number of blocked transactions.

Stopping at the most recent consent without reconstructing the chain is the third. The means of proof referring to the last work on the whole building has its own conditions, and does not amount to a general licence to disregard the earlier history.

Dating departures by approximation is the fourth. The date of construction determines the applicable regime, particularly for tolerances, and an undocumented attribution undermines the classification.