Burglar Alarm vs Locks Priority | Spend in the Right Order
Alarms react, locks prevent. Most Liverpool homeowners buy them in the wrong order. Here's the sensible spending sequence for a normal home.
An alarm tells you something has already gone wrong. A good lock stops it going wrong in the first place. The security industry sells you the reaction before the prevention, and there's a straightforward reason: the alarm carries a monthly subscription and the lock doesn't.
I'm not anti-alarm. I want to be clear about that before anyone emails me. But I do think the order of spending in most Liverpool homes is backwards, and it costs people money while leaving the actual weak points untouched.
What an alarm actually does
A monitored burglar alarm, installed to BS EN 50131 Grade 2, will detect movement or a door breach and, depending on your response contract, have someone call you or the keyholder within a few minutes. Average police response to a confirmed intruder alarm in Merseyside is longer than most homeowners assume. The burglar is typically inside, doing what they came to do, for two to four minutes before they leave. An alarm shortens the comfortable window. It doesn't close the door.
Snap attack on a standard euro cylinder takes about 20 seconds. The alarm hasn't even triggered yet.
What a lock actually does
A TS007 3-star cylinder, say an Ultion or Avocet ABS, is rated to resist the specific attack methods used in the overwhelming majority of residential break-ins on Merseyside: snap, pick, bump, and drill. The TS007 test protocol runs each attack for a set duration under defined force, and the cylinder has to survive all of them to earn 3-star. Pair it with a BS3621 deadlock on the same door and you've dealt with the two most common entry points before the criminal has even decided whether your house is worth the effort.
Cost? A professional supply-and-fit of a quality TS007 3-star cylinder in Liverpool runs roughly £80 to £130. A decent alarm system plus professional installation plus 12 months' monitoring runs £400 to £800 and repeats annually.
The sensible spending order
| Step | What | Approx. one-off cost | Ongoing cost |
|---|---|---|---|
| 1 | TS007 3-star cylinders, front and back | £80–£130 per door | None |
| 2 | BS3621 five-lever deadlock if you have a timber door | £90–£160 fitted | None |
| 3 | Door chains, hinge bolts, patio door locks where needed | £30–£80 per door | None |
| 4 | Alarm system (self-monitored app first, then full monitoring if you want it) | £150–£800 fitted | £0–£40/month |
That order isn't my opinion pulled from nowhere. Sold Secure and the police-backed Secured by Design scheme both state that physical security is the first line. The alarm is explicitly described as a secondary deterrent in Secured by Design guidance.
The obvious objection
"But I can see the alarm box from the street and that puts burglars off." Fair point. A visible alarm box does have deterrent value. So does a lock a professional can't snap in 20 seconds. Both deter. Only one physically resists.
And deterrence only works on someone who is choosing between your house and the next one. The ones who've already decided tend to just be faster.
The fair caveat
If you live in a detached property in Woolton or Allerton, with side access and no overlooking neighbours, an alarm absolutely earns its place higher up the priority list. Isolation changes the risk profile. And if your insurer mandates a monitored alarm for contents cover above a certain value, that's a real constraint, not a suggestion.
But for the semi-detached in Wavertree, the terraced house in Kensington, the flat in L6? Start with the cylinder.
A confident position
Spend £100 on a proper cylinder before you spend £500 on a subscription. Make the door the obstacle, then add the alarm as the backstop. The industry will keep selling you the subscription first because that's where the revenue is. You don't have to buy it in that order.
If you're not sure what's on your door right now, Liverpool Locksmith Services covers Liverpool and all L postcodes, usually arriving in under 30 minutes. We'll tell you honestly what you've got, what it'll resist, and what it won't. Prices quoted on the call, no obligation.
Priya Nair, Security and standards specialist
Priya is the one who reads the test reports. She handles the survey work, the insurance questions and anything where the British Standard actually matters, and she will happily explain why the number on the box is not the number that counts.
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