Yeah maybe, but I have seen both on commercial. Missed the 1313 good spot. Either way they are too tight to pay for proper monitoring.
Eta, the bad stipple artex would also point to a resi,but the painted wall for the keypad?
Not to be a topper but just thinking mine is from c1995, now only used for the Xmas lights outside and spent a couple of days under water in 2007, but still.
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The best way forward would ideally to have the door contact replaced so the system is functioning, then have it checked over fully by a competent engineer.
You could look to replace the contact yourself if you feel able.