There is no such thing as an under floor safe with accredited European certification, with good reason.
Under floor Safes are experiencing resurgence in popularity recently. As the main cost of an under floor safe is labour in fitting, selling an under floor safe is a very profitable proposition to many suppliers.
From a certification and risk assessment standpoint it is important to understand the following points:
The main protection an under floor safe has against attack is the quality of the concrete and reinforcement used in its installation and the resistance to attack offered by its door. There is no way to seriously assess an under floor safe installation after fitting. As for the main point of attack, which is undoubtedly its door, this very rarely approaches the level of attack resistance one would expect from even a low grade certified safe.
Consequently opening most under floor safes is quite a straight forward task for even an amateur burglar and drilling is made a lot easier by the safe’s location. As there is no testing and certification for under floor safes, the market is wide open to very poor quality units sold cheaply by unscrupulous suppliers.
Do not expect an under floor safe to withstand a competent attack. It probably won’t.
There are some very good conscientious installers who can do an excellent job of fitting a good quality under floor safe but there are also less skilled installers who may disregard concrete mix, reinforcement and resealing damp courses under the safe after a space has been excavated for its installation. There are also, as previously stated, many very poor quality under floor safes that even if fitted correctly offer very little resistance to attack even with a budget cordless drill.
The temperature differential between the inside and the outside of the safe can cause condensation on the safe’s lid. The lid being the highest point of the safe. Over time this can cause rust. For this reason a key lock needs to be maintained regularly and a mechanical combination lock can have similar issues. Where condensation occurs electronics are not recommended.
As the majority of under floor safes are used in a residential context the question has to be asked, is fitting this kind of safe correctly more cost efficient when compared to a fully certified freestanding (bolted) safe? Given the comparative low cost of residential grade safes and the speed and ease of installation, the answer is apparent.