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Advise reliable basement doors with a high level of protection against burglary

We would like to install new solid doors (e.g. steel) in the basement rooms.

Fire doors are easy to break through, so no real protection.

What we are looking for

— simple, but extremely safe intermediate doors for the interior

— Also, an exterior basement door – which must be incredibly secure.

It should be quasi predominantly for burglary protection or against intrusion into or inside the house.

— thermal insulation etc. not required

— galvanized / corrosion protection is enough

— Who builds simple but heavy solid steel doors?

Since we have already had uninvited guests, it should be as massive as possible.

Also, the finances should not get out of hand. So very simple, but incredibly massive doors (e.g. high sheet thickness, hardened).

Who can help us there?

• basement
• protection
• solid door