Quick answer
There is no single tell that proves a composite door is secure, but a genuine PAS 24 doorset with a TS007 3-star cylinder, a fully engaging multi-point mechanism and internally beaded glazing covers the vast majority of realistic domestic risk. The quickest way to know for certain is a five-minute inspection by someone who fits these doors for a living.
Overview
A properly-specified composite door is the most secure front door you can buy for a domestic UK property. But 'composite door' covers everything from PAS24-tested doorsets with 3-star cylinders down to budget imports with 1-star locks and stapled beading. The audit below tells you which end of the scale yours sits on.
Symptoms
- You don't know what standard your door was tested to.
- Cylinder has no visible kitemark.
- Hinges are visible from outside (no anti-lift studs).
- Glazing beads look loose or are on the outside.
Common causes
- Original spec was budget rather than PAS24.
- Cylinder was never upgraded from the 1-star it shipped with.
- Fitters used generic hinges instead of security hinges.
The gap between 'looks secure' and 'is secure'
Two composite doors can look identical from the pavement and sit at opposite ends of the security spectrum. The GRP skin, the woodgrain finish and the chunky handle are cosmetic. What actually stops an intruder is hidden: the cylinder inside the handle, the steel hooks inside the door edge, and the screws holding the keeps to the brickwork behind the frame, not just to the plastic frame itself.
We see this gap most often on doors fitted eight to fifteen years ago, before TS007 star-rated cylinders became the industry default. The door itself is often still structurally sound - a good composite slab lasts decades - but the original lock spec has aged out of relevance while the homeowner assumed nothing had changed.
What a proper inspection actually checks
A worthwhile security check goes beyond jiggling the handle. It looks at the cylinder for a kitemark and star rating, checks how far it protrudes past the handle plate (anything more than 2-3mm is a snapping risk), and watches every hook and bolt engage as the handle is lifted with the door open.
It also checks things homeowners rarely think to look at: whether the hinges have anti-lift studs, whether the glazing beads sit on the inside or outside of the glass unit, and whether the keeps are screwed only into the uPVC or GRP frame or extend into the masonry behind it. On Cornish properties with granite or cob construction, that last point is often where corners were cut on the original install.
Coastal Cornwall adds its own wrinkle
Salt-laden air accelerates corrosion in cheaper cylinder and gearbox components faster than it will inland. A cylinder that would give twelve trouble-free years in Exeter might start seizing or weeping rust after seven on an exposed stretch of the north coast. That means the visual 'looks fine' test is less reliable here than elsewhere, and a functional test matters more.
Holiday lets and second homes standing empty for weeks between guests are a particular case: a weak lock left untested for a month is exactly the kind of thing that fails quietly, then gets discovered when a changeover cleaner or a guest can't get the key to turn.
The three most common weak points we find
In order of frequency, the components most likely to be under-specified on an older composite door are the euro cylinder, the glazing bead position and the keep fixings. Fixing the cylinder is nearly always the cheapest and highest-impact single upgrade available.
- Non-kitemarked or 1-star cylinder protruding past the handle
- Glazing beads fitted externally, allowing the glass to be popped from outside
- Keeps screwed only into the frame profile, not through to brick or block
What a genuinely secure setup looks like
On a well-specified door you'll find a TS007 3-star cylinder (or a 1-star cylinder paired with a 2-star security handle, which gives the same overall rating), a 5 or 7-point locking mechanism that engages every hook and bolt cleanly, hinges with anti-lift studs, and laminated inner glass panes.
None of that is unusual or expensive to retrofit piece by piece. Most homes we visit for a security check end up needing one or two targeted upgrades rather than a full door replacement, which keeps the cost sensible.
When a check turns into a repair
If an inspection turns up a genuine weakness - a sheared cam, a protruding cylinder, keeps that pull straight out of soft frame plastic - it's worth fixing there and then rather than booking a second visit. Most of these jobs take under an hour with the right parts carried on the van.
Typical repair costs in Cornwall
| Work | Typical price | Notes |
|---|---|---|
| Security inspection & report | £45-£75 | Often waived if remedial work is booked |
| TS007 3-star cylinder upgrade | £75-£130 | The single highest-impact fix |
| Keep reinforcement into masonry | £90-£150 | Per door, includes longer fixings |
| Full multi-point mechanism replacement | £180-£320 | Where the gearbox itself has failed |
Guide prices only — we confirm the cost after seeing the door.
When to call a professional
- Any missing element - book a security assessment.
Prevention
- Upgrade weakest link first (usually the cylinder).
