Retrofit reinforcement or a certified security door set
Retrofit reinforcement keeps your existing door and strengthens it. A folded steel sheet clads the door leaf, steel angle profiles protect the door frame, a multipoint lock is fitted, and security pins are added to stop the door being lifted off its hinges. The outside appearance of the door changes, but the original joinery stays in place.
A certified security door set is a complete unit — door leaf, frame, lock and hinges — designed and tested as a whole, then installed in place of the existing door. It is the most effective solution, because its resistance does not depend on the quality of the original structure around it.
The deciding factor is the condition of the door frame and the wall. Retrofit reinforcement fitted to a rotten frame or a hollow partition wall will not deliver what you expect: the force applied during a break-in is transferred to the fixings, and therefore to whatever they are anchored in.
The A2P BP certification
Certified security door sets are measured against the A2P BP certification, issued by CNPP. It has three levels — BP1, BP2 and BP3 — corresponding respectively to five, ten and fifteen minutes of resistance to break-in attempts in standardised tests.
The certification applies to the unit as tested. Swapping the lock on a certified door set for another model, however well regarded, voids the certification, since the configuration is no longer the one that was put through the tests.
Installation matters as much as the product. A BP3 door set poorly anchored in the masonry is no better than an ordinary door. Insist on being given the certification report, and make sure the installation record states the fixing method used.
The particular case of the Côte d'Azur's housing stock
The Alpes-Maritimes sets side by side kinds of housing that have almost nothing in common: the tall, narrow Genoese buildings of the Vieux-Nice (the old town), the terraced village houses of the historic centres — Vence, Biot, Le Suquet in Cannes — Belle Époque buildings with double-leaf flat doors, the large hillside blocks of flats built in the 1960s and 1970s, villas closed off by a gate, and recent developments on the Var plain. Reinforcement is not the same proposition from one to the next.
In older properties, doors are frequently in non-standard sizes: having a door set made to measure is more often necessary than exceptional. In return, the frame is set into stone masonry that provides outstanding anchorage — provided the installation is carried out by someone who knows how to work with that material. There is also a purely practical constraint: in the pedestrian lanes of the Vieux-Nice, the stairways of Villefranche-sur-Mer or the alleys of the old town of Grasse, a door set has to be carried up by hand, and its weight and bulk are part of the choice. Conversely, the hillside blocks of flats and the developments on the Var plain have doors in standard sizes and sound masonry to fix into: there the difficulty shifts to the co-ownership rules, which often govern the appearance of doors opening onto the landing.
Then there is the heritage question. The urban landscape of Nice, Winter Resort Town of the Riviera, is inscribed on the UNESCO World Heritage List; the old towns along the coast and the historic cores of the hill villages frequently lie within the surroundings of listed historic monuments or in protected areas. Altering the outside appearance of a door visible from the public highway there may require planning permission and the opinion of France's heritage architect authority (Architecte des Bâtiments de France). Check with your local council's planning department before starting any work.
What door reinforcement does not do
Reinforcement protects an opening, not a home. If your door becomes the most resistant point, attention will naturally shift to a ground-floor window, a balcony French door, a window onto an inner courtyard or a garage entrance.
Consistency therefore matters more than raw performance. Reinforcing the front door of a ground-floor home whose windows have neither shutters nor break-in-delaying glazing moves the problem rather than solving it.
Finally, reinforcement is no substitute for basic habits: not announcing a long absence on social media, having your post collected, using outdoor lighting, keeping on good terms with the neighbours. These measures cost nothing and count for a great deal.