You best be checking if your municipal government will require you to take out a building permit, and depending on where in your house you intend on building your steel room, they could demand, and perhaps you should hire an engineer to design the supporting structure.(steel is heavy).
Think this through.... it’s a money pit and a nightmare in the making.
Where you could build a room in your barement without Windows, with metal shelving attached to the walls or rebar run through the studs, on the outer walls, and a reinforced door, with blind hinges, with a lattice of rebar added to the ceiling joists.
This way you aren’t hiring a contractor who could run his mouth, and if the room isn’t anything out of the ordinary it might not require a building permit, thus keeping your intention to build it out of the public eye, which is of higher importance than steel walls.(stay off everyone’s radar)
Declaring a specific gun room to anyone be it the municipality or using a contractor is not some of your better design features.
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There are no absolutes
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