Cheap vs Expensive Lock Upgrades | Spend Right
Hinge bolts and a 3-star cylinder cost under £80 fitted. A smart lock costs £900. One stops burglars. A locksmith explains which is which.
Most people who call me wanting a security upgrade have already spent money in the wrong place, or they're about to.
They've seen a glossy smart lock on Instagram, or their neighbour got one, or they read a listicle that called it a "next-level" solution. What they haven't done is fit hinge bolts. And that's the single cheapest upgrade that almost nobody fits, on doors where it matters most.
Let me tell you why that gap between what sells and what works quietly drives me mad.
The upgrade that stops burglars and costs almost nothing
Hinge bolts. Also called hinge reinforcers or dog bolts depending on who you ask. They're passive steel bolts, fitted to the hinge side of a door, that lock into a keep in the frame when the door closes. Cost of the bolts: around £15 for a pair. Fitting time: 45 minutes on a straightforward door. Total fitted cost from me, including parts, is usually £60 to £80.
Here's the thing about a uPVC door's hinge side. The multipoint lock does its job on the latch side, handle side, top and bottom. But the hinge side? On most doors I open in Stony Stratford, Old Stratford, and across the MK11 postcodes, there's nothing reinforcing it at all. Kick the door hard enough in the right spot, or lever it at the hinge, and you don't need to touch the lock. The frame gives up before the lock does.
Hinge bolts close that gap. Steel into steel. The door can't be forced open from the hinge side. And yet, in fifteen years of doing this work, I'd estimate fewer than one in ten uPVC doors I visit has them.
Why nobody fits them
Because they're invisible when the door's closed. There's nothing to show a visitor, nothing that photographs well, no app, no notification to your phone. They don't feel like a purchase. They feel like a precaution, which is exactly what good security is.
The door companies don't push them because they're cheap and the margin's poor. The big DIY sheds don't stock them prominently. And so they sit in obscurity while homeowners spend ten times more on things that are far less useful against a physical attack.
The cylinder situation
While I'm at it: the cylinder that came with your door is almost certainly not a 3-star TS007 cylinder. The builders' merchant spec, the one that goes in every new-build on Galley Hill or the new plots off Newport Road, is usually a budget euro cylinder that will snap in under 30 seconds with a pair of pliers and a screwdriver. That technique is so common it has its own name. You know it as lock snapping.
A 3-star TS007 cylinder, or a cylinder that holds an SS312 Diamond accreditation, costs £40 to £70 for the part. Brands I actually fit: Ultion, Avocet ABS, Mul-T-Lock MT5+. Fitted cost including the cylinder is typically £90 to £130 depending on the door and the size needed. That's it. That's the upgrade.
For a total spend of around £180 to £200 fitted, you can have hinge bolts and a snap-resistant cylinder. Your door is now properly resistant to the two most common physical attacks used on UK residential properties.
The expensive one everyone does instead
The smart lock. I've written elsewhere about smart locks I'd genuinely fit at home, and there are a couple I don't mind. But I keep coming back to what a customer on Fullers Slade told me last year. She'd spent £850 on a smart lock system because she liked being able to let her cleaner in remotely. Fine. Reasonable use case. Then I looked at her door.
No hinge bolts. Standard budget cylinder still in the lock body underneath the smart lock's motor unit. The frame was soft at the keep, a previous repair that hadn't been done properly.
The smart lock had a fingerprint reader, a PIN pad, remote access via app, and a battery backup. What it didn't have was any meaningful resistance to someone booting the door near the hinges, or coming in via the cylinder underneath it.
She'd spent £850 on convenience and nothing on security. That's not a criticism of her, she didn't know. It's a criticism of the way these products are marketed.
The obvious objection: isn't smart lock tech just better?
For some things, yes. If you're a landlord with a short-let in New Bradwell or Wolverton, remote access control is genuinely practical. If you've got elderly relatives who lose keys, a code entry system makes life easier. I'm not anti-smart lock.
But smart lock technology addresses access management. It doesn't address forced entry. A decent smart lock with a Yale module still relies on the door frame and the cylinder beneath it. If you haven't sorted those first, you're securing the top floor of a house with a rotten foundation.
The test question is simple: if someone wants to get through your door and they don't care about making noise, does your upgrade slow them down? Hinge bolts and a 3-star cylinder: yes. A fingerprint reader on a standard cylinder in a soft frame: no.
The fair caveat
If your door is old, warped, or the frame is already damaged, no cylinder upgrade fixes that. I've seen doors in Cosgrove and Deanshanger where the woodwork around the keep is so soft the whole frame needs replacing before any hardware makes sense. In those cases, the spend order changes, and the frame has to come first. But that's a different problem to choosing between a £200 security upgrade and a £900 tech purchase. On a sound door, the cheap upgrade wins almost every time.
A rough comparison
| Upgrade | Parts cost | Typical fitted cost | Resists forced entry? | Resists snapping? |
|---|---|---|---|---|
| Budget cylinder (builder's spec) | £10-£15 | Already fitted | No | No |
| TS007 3-star cylinder (Ultion / ABS) | £40-£70 | £90-£130 | Improved | Yes |
| Hinge bolts (pair) | £15-£25 | £60-£80 | Yes | N/A |
| Both combined | £55-£95 | £180-£200 | Yes | Yes |
| Mid-range smart lock | £300-£500 | £400-£650 | No added benefit | Not unless cylinder replaced |
| Premium smart lock system | £600-£900 | £850-£1,100 | No added benefit | Not unless cylinder replaced |
Those fitted prices assume a standard uPVC door without complications. Timber doors, older frames, or unusual cylinder sizes will shift the number.
Spend on what stops them
The burglar trying your door at 2am on a Tuesday isn't defeated by an app notification. He's defeated by steel that won't move and a cylinder that won't snap. Both of those things cost less than a decent meal out for two.
Fit the hinge bolts. Replace the cylinder. Then, if you still want the smart lock for the convenience, fine, go ahead. But do it in that order.
If you're not sure what you've got, I'll tell you honestly on the call. Rapid Response covers Stony Stratford and the MK postcodes, and I aim to be with you in under 30 minutes for urgent calls. Pricing is given upfront, before any work starts.
Bernard Gladwell, Commercial and landlord locksmith
Bernard looks after the shops, offices, HMOs and landlords around Stony Stratford. Thinks in terms of what a thing costs a business over a year, not just on the day, and has fitted enough master suites to know when one is overkill.
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