An underfloor safe should be installed into an opening significantly larger than the safe itself and we recommend at least a cubic metre of concrete.

If you have a concrete floor this will involve breaking up the floor and forming an opening with a electro pneumatic breaker like a Kango.

If you have a suspended wooden floor a plywood shuttering box will need to be fashioned in which to pour the concreter to install the safe.

The size of the underfloor safe you can install is limited by how deep you can safely excavate and the room itself.

After the safe and reinforcing bar have been lowered on to the level concrete base of the hole, further layers of concrete, well mixed with fine aggregate, are stamped down into position.

When the installation is complete no portion of the neck or deposit tube should protrude above floor level.