Villa with bunker or panic room: what to check before buying

NetCom Private Value

Buying a villa with a bunker, fallout shelter or panic room? Permits, land registry, filters, damp, testing and the documents to ask for before the deed.

Before buying a villa with a bunker or panic room, check three things: that the shelter is authorised and registered in the land registry, that a signed design and structural calculations exist, and that air, filters, doors and systems are in order and documented. A shelter without a permit is a building offence that weighs on the sale; a shelter without maintenance is just a well-built cellar.

This page is for anyone buying a house with a fallout shelter or a safe room in Italy, and for the estate agents offering it.

What to check before the deed

1 · PlanningIs the shelter lawful?As a rule, an underground shelter in Italy is a new construction and requires a building permit (Presidential Decree 380/2001, arts. 3 and 10; Court of Cassation, criminal section III, 12 May 2014 no. 19444). In a protected landscape area, landscape authorisation is normally also required (Legislative Decree 42/2004, art. 146; Presidential Decree 31/2017): only fully underground volumes with no works above ground are exempt, whereas a shelter usually has an access, air intakes and an exit. If the building is a listed cultural asset, the authorisation of the heritage authority (Soprintendenza) is also needed (art. 21). Ask for the permits, check that the actual state matches the approved drawings and that the room is registered in the land registry. An unauthorised volume is a building offence: it can block the deed or the mortgage, or require regularisation, where possible. Your surveyor will verify it.
2 · DesignDo a design and calculations exist?Ask for the signed structural calculation, the report on the references followed (for example the technical instructions of the Swiss Federal Office for Civil Protection, ITRP 1984 and ITC 2017, or ISO 22359:2024, guidelines for protective shelters, and ISO/TS 22359-2:2026, requirements for protective equipment) and the component data sheets. Without documents, nobody can say what the shelter is able to do.
3 · AirVentilation, filters and valvesCheck make and model of the system, installation date and expiry of the NBC filters, the condition of the blast valves, the ducts and the door seals. An expired filter no longer guarantees filtration; a hardened seal compromises the airtightness. How air works in a shelter.
4 · EnvelopeDamp, water ingress and radonStains, efflorescence, a smell of mould and rust on the rebars are signs not to ignore. In underground rooms a radon measurement is advisable: for homes, Italian Legislative Decree 101/2020 sets reference levels (300 Bq/m³ for existing buildings, 200 for those built from 2025); the measurement obligation applies to workplaces. Ask whether measurements exist and what the result was.
5 · AutonomyEnergy and communicationsBatteries, generator or backup power supply: age, last test, declared duration. Check that from inside you can communicate with the outside even without the house line. Autonomy, energy and water.
6 · HistoryTesting and maintenanceAsk for the report of the airtightness and overpressure tests carried out at handover and the log of subsequent checks. If they are missing, the shelter must be tested before any value is attributed to it.

If the house has a panic room

A panic room protects for minutes or hours, until help arrives; a bunker for days, from external events. The checks change accordingly (the differences).

  • Door: declared class (for example EN 1627 RC4), rating plate and documents, condition of hinges, locks and frame. The door class alone does not prove the resistance of the room: walls, ceiling and openings count as much as the door.
  • Independent communications: a connection that works even if the intruder cuts the line or the power supply of the house.
  • Integration with the alarm: locking yourself in must trigger the alarm and the call to whoever responds. Check who receives the signal today and whether the contract passes to the new owner.
  • Codes and keys: they must be changed at handover, like those of the alarm.

A security door alone does not make a panic room: what is really needed is explained on the page safe rooms and panic rooms.

Villa with garden overlooking the lake

Documents to ask the seller for

  • Building permit for the shelter (permit or regularisation) and approved drawings
  • Landscape authorisation, if the area is protected
  • Land registry extract and floor plan showing the room
  • Signed structural calculation and technical report
  • Data sheets of ventilation, filters, valves and doors
  • Installation and replacement dates of the filters
  • Test report with airtightness and overpressure tests
  • Maintenance log and periodic checks
  • Any radon measurements
  • For the panic room: door documents, communications diagram, alarm contract

If a document is missing, it is not necessarily a problem: it must be assessed by a surveyor before the deed, not after.

For agencies and sellers: how to present a shelter

A well-documented shelter or panic room is a selling point. Without documents, they become a question the buyer will look to answer elsewhere.

What to writeVerifiable facts“Authorised underground protected room, with ventilation and NBC filters, filters replaced in [year], test report available.” Or: “safe room with RC4 class door and connected alarm”.
What to avoidPromises that cannot be backed up“Guaranteed nuclear-proof”, “indestructible”, “total protection”, “proof against everything”. They expose the seller and drive away the informed buyer.

Two further points of care: no photos showing the accesses, controls or routes of the shelter, and full technical details only to qualified buyers, after a confidentiality agreement.

NetCom technical check before the sale. At the request of the owner or the agency we can carry out a site survey and draw up a report on the condition of the shelter or panic room: air, filters, doors, energy, communications, integration with the alarm, documents present and missing. Planning lawfulness is verified by the appointed qualified surveyor; we point out what has to be asked for. How we work with agencies and practices.

Frequently asked questions

Is a villa with a bunker worth more?

An authorised, documented and maintained bunker is a distinctive feature for a villa. An unauthorised or abandoned one, on the other hand, can become a cost for the buyer.

What happens if the villa's bunker has no permit?

A bunker without a permit is a building offence: it can hinder the deed and the mortgage and, depending on the case, require regularisation or restoration of the previous state. The situation must be checked with a qualified surveyor and with the municipality before signing.

Does the bunker have to be registered in the land registry?

As a rule yes, and it can affect the cadastral income: the surveyor confirms it. Before the deed, check that the cadastral floor plan matches the actual state.

How do you tell whether a bunker's NBC filters are still valid?

Every filter has a plate with the production or installation date and a service life stated by the manufacturer. If the date is missing or has passed, the filter must be considered due for replacement.

Who can check a bunker before buying a villa?

NetCom Security Group carries out a site survey and draws up a report on the condition of air, filters, doors, energy and communications, with the list of documents present and missing. The planning side is verified by the qualified surveyor.

Can a bunker be added to a villa just bought?

Often yes, with a design, as a rule a building permit and an assessment of the ground. It starts with a preliminary check of the site and the needs. The options are explained in the article on a bunker in an existing villa, under the house or in the garden.

The NetCom path in five steps

NetCom Security Group designs and coordinates private fallout bunkers, NBC shelters and panic rooms for villas and residences, throughout Italy and, on a project basis, in Europe. Every project follows the same five steps, with a single point of contact from the start to maintenance.

Step 1Preliminary checkSeven questions online, two minutes, no registration: likely solution, permits, constraints and documents to prepare.Start the check →
Step 2 · FreeFree confidential consultationWe understand what you want protection from, who has to use the shelter and whether it really is the right answer. If it is not, we tell you.
Step 3Feasibility studySite survey and verification, with our qualified partner engineers, of ground, structure, permits, air and systems. The quotation comes from here, item by item.
Step 4Design and coordinationThe structural calculation is signed by a qualified engineer and the works are carried out by the client's contractor. NetCom coordinates, supplies ventilation and filters, doors, communications and electronic security, and carries out the final check.
Step 5Maintenance and checksPeriodic checks, ventilation and airtightness tests, replacement of filters and batteries when due, with a written plan from the design stage.

Buying or selling a house with a shelter?

We can assess the condition of the shelter or panic room before the deed, confidentially. The first consultation is free.

Request a technical checkPreliminary check

Tel. +39 045 245 7879 · bunker@netcomsecuritygroup.com · Monday–Saturday 9:00–17:00. We work throughout Italy and, on a project basis, in Europe.

This page is for information only and does not replace the opinion of the qualified surveyor, the notary and the municipality.

Who wrote this guide

Author Matteo Fiasca Founder & CEO of NetCom Security Group · Consultant for the security of people, property and assets He founded NetCom Security Group in 2020 in Negrar, in the province of Verona, and works as a consultant for the protection of people, property and assets. Every project starts from the risk analysis, not from the technology. He leads the bunker, shelter and panic room line of NetCom Private Value. Expertise: risk analysis and site survey · intrusion alarm systems and security grades (EN 50131) · video surveillance and access control · safe rooms and panic rooms · bunkers and NBC shelters · safes, strongrooms and vaults. He contributes to the press with technical analyses on the prevention of theft and robbery. Last updated: 23 October 2026 About us →  ·  Press area →

Let's talk about your project

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Private individuals and familiesA new or existing villaTell us the location, how many people the shelter must accommodate and what you want protection from.
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