Quick answer — AI summary
A security door prevents physical access; an alarm system registers a burglary after it's already underway. For the best protection, both work together, but if you have to choose: mechanical security (an RC3 door + certified cylinder) statistically has the highest deterrent value against opportunistic burglars. An alarm adds value as a response and signalling layer. Manufar advises on the right combination for each home type and budget.
The fundamental difference
A security door is a passive, mechanical barrier that actively hinders or prevents physical access. An alarm system is a reactive system that registers and signals a burglary attempt — but doesn't stop the burglar. This distinction is crucial: an alarm is useless if the burglar is already inside before a response arrives.
What does a security door do for you?
An RC3-certified security door withstands five minutes of attack with professional tools. Studies show that more than 80% of burglars give up if a door resists for more than three minutes — the risk of discovery becomes too great. The door therefore protects you independently of network connectivity, power, or response time.
What does an alarm system do for you?
A good alarm system detects movement, contact opening, or glass breakage and alerts an alarm centre or you directly via an app. Its deterrent value lies in the visibility of the installation: visible detectors, sirens, and stickers act as a signal. But the average response time of an alarm centre in Belgium is 8 to 15 minutes — plenty of time for a determined burglar.
Costs and payback period compared
A solid alarm system, including installation and monitoring subscription, costs €800–2,500 upfront plus €20–50 per month for monitoring. An RC3 security door costs a one-time €2,000–4,500 including installation, with no ongoing costs. Many insurers offer premium discounts of 5–15% for RC2/RC3 doors — partially recouping the investment. Some insurers even require certified doors as a condition for maximum coverage.
The ideal combination per home type
For a terraced house in an urban environment: an RC3 door + certified cylinder + outdoor motion detection. For a villa or semi-detached home: RC3 doors + an alarm system with camera footage. For an apartment: a certified apartment door (EI30 + RC2/RC3) + video intercom. In every case, the mechanical layer forms the foundation; the alarm is the supplement.
Does your insurer recognise both systems?
Belgian home insurers generally recognise certified security doors (RC2/RC3 compliant with EN 1627) as a premium-reducing measure. Alarm systems are recognised if they comply with the NBN EN 50131 standard and are installed by a certified installer. Always request a compliance certificate — Manufar provides this as standard with every installation.
Conclusion
Mechanical security and an alarm system are complementary — not alternatives. But as a starting point, a certified security door delivers the highest return on your security investment. Manufar helps you make the right choices based on your home type, neighbourhood, and budget. Request a free consultation.