Passing the test isn’t the
same as protecting people
Most fire detection systems are tested regularly. Many are signed off as compliant.
But there’s a critical question that often goes unasked: Will your smoke detectors activate early enough in a real fire?
The 10-year reality check:
Why testing alone isn’t enough
Smoke detectors don’t fail overnight.
They degrade gradually over time.
After around 10 years:
Sensor sensitivity reduces
A fire may need to be more established before activation occurs
Response times increase
Many systems continue to pass routine tests, but routine testing uses artificial smoke to confirm activation.
The detector works
Not how quickly it responds
Not how it behaves in real fire conditions
Not how sensitive it is
Time changes
performance.
In a real fire,
seconds matter.
Delayed detection can mean the difference between a small, containable incident and a major life-safety risk.
Ready to book
a 10 year head
change review
What the standard requires
BS 5839-1 does not prescribe a fixed lifespan for smoke detectors.
It requires systems to be maintained in efficient working order and good repair.
Performance changes over time, and sensitivity cannot be fully validated through functional testing alone.
For this reason, manufacturers and fire safety professionals commonly recommend replacement at around 10 years, reflecting typical sensor life expectancy.
The question isn’t whether a detector still works – it’s whether it still works as intended.
The 10-year head change review
Our Fire Detection Health Check reviews:
→ Detector age and condition
→ Alignment with BS 5839-1 guidance
→ Real-world performance considerations
→ Clear, prioritised recommendations
No unnecessary change.
Just clear insight to support informed decisions.
Book your review today
To speak to one of our team, click the link below
or email communications@hk.co.uk