Managing signs and plates on common parts

The starting principle: individual use of common parts

Under the general principle governing common parts in Italian condominium law, each owner may use a shared element of the building provided the use does not alter its purpose and does not prevent other owners from making equal use of it according to their own rights. Installing a professional plate next to the entry phone panel or a sign above one's own shop window generally falls within this lawful use of a common part: the owner is simply identifying their activity, without taking the facade or the entrance hall away from anyone else.

This does not mean everything is permitted without limits. Courts consistently distinguish between a small, proportionate plate, which falls within ordinary use of the common part, and a large illuminated sign, a backlit panel or a projecting structure that changes the building's appearance: in those cases a single owner cannot decide alone, because the work affects the architectural harmony that belongs to every owner collectively.

When the owners' meeting must authorize the installation

The practical dividing line is the impact on the building as a whole. A small metal or plexiglass plate placed next to the main door alongside similar plates from other professionals usually needs no formal resolution: it falls within ordinary, tolerated use consistent with settled case law. The situation is different for illuminated or backlit signs that change the facade's nighttime appearance, large panels that cover a significant portion of the frontage, projecting structures or advertising awnings that extend over the public street, and installations requiring structural drilling or electrical cabling through common parts.

In these cases the property manager must bring the request to the owners' meeting, which resolves with the majorities required for building improvements or changes affecting architectural harmony, typically the qualified majority that applies to genuine building innovations. The meeting can also set general criteria in advance, such as approved materials, position, maximum size and lighting method, so future requests can be handled consistently without a fresh discussion each time.

Building rules and their binding force

Building rules of a contractual nature, approved unanimously or set by the original developer and accepted by all buyers, can regulate signs and plates in detail: prohibiting them entirely on certain sections of the facade, requiring a uniform format, or requiring prior approval from the property manager or the meeting even for small plates. Where such clauses exist, they take precedence over the general freedom to use common parts, because they stem from a contractual agreement among owners.

It is therefore good practice, before installing any sign, to check the building rules currently in force rather than relying on common sense alone: rules that prohibit advertising signs on the main facade are fully valid and binding even on an owner acting within their professional or commercial activity.

Architectural harmony and the limits of an outright ban

Architectural harmony, protected by case law applying the provisions on building innovations and facade alterations, does not amount to an absolute ban on every distinctive sign: it means the installation must not appreciably alter the building's aesthetic coherence as perceived from the outside. A discreet professional plate, aligned with others already present, rarely breaches this protection even without formal authorization, while a sign disproportionate to its surroundings can compromise it even if the meeting has never specifically addressed the issue.

For professionals running a practice or business from a unit within a residential building, the safest approach remains informing the property manager before proceeding, to check for existing rules or prior resolutions on the matter, avoiding forced removals or disputes later on that cost far more time than a simple upfront request.

Managing requests with digital tools

Keeping an orderly record of these requests, tracking who asked for what and when authorization was granted, becomes much easier when the property manager has digital tools that centralize communications, meeting minutes and the building rules documentation. With software like AmministraPro, the manager can file the owner's request, attach the minutes of the resolution authorizing or rejecting the installation, and make the history of decisions on architectural matters available to all owners, reducing the risk of repeated requests or disputes based on an alleged lack of clear rules.

Frequently asked questions