Euro Cylinder Lock
Replacement In South London
The most common door lock in the UK — and the most targeted by burglars. We supply and fit TS007-rated anti-snap euro cylinders that meet your insurer's requirements, same day across South London.
Pricing Guide
After midnight prices increase — call for quote. Complex jobs: send photos via WhatsApp for accurate price.
What is a Euro Cylinder Lock — and Why Does It Matter?
The euro cylinder is the oval-shaped barrel that sits inside your door. Turn the key, the barrel rotates, the cam pushes or pulls the locking mechanism. It sounds simple. The problem is that a standard euro cylinder is straightforward to snap — a technique burglars can execute with hand tools in under a minute.
Euro cylinders were introduced to the UK in the 1990s as a convenient alternative to mortice locks on uPVC and composite doors. They became the standard fitment on almost every front door in the country. By the mid-2000s, door manufacturers and insurers realised there was a problem: the same standardised format that made cylinders interchangeable also gave burglars a repeatable attack method.
Snap attacks work by applying rotational force and downward pressure simultaneously. The cylinder breaks at a weak point near the cam, the attacker removes the front stub, then uses a screwdriver to rotate the exposed cam mechanism. The door opens. No noise. No glass. No forced entry that would be obvious from outside.
The answer was TS007 — a British Standard that defines what a cylinder must do to resist snapping, picking, bumping and drilling. A 3-star TS007 cylinder (or the combination of a 1-star cylinder with a 2-star handle) is what you need to satisfy most home insurance policies issued after 2015.
Where They're Found
uPVC doors, composite doors, UPVC patio doors, multi-point locking systems, and some timber doors with modern hardware.
The Snap Problem
Standard cylinders break at the cam groove when forced. Snap-resistant cylinders sacrifice the outer section while protecting the inner mechanism.
TS007 Standard
The UK's anti-snap testing standard. A 3-star rating is the benchmark for insurance approval on cylinder locks in South London.
South London Context
Snap attacks are disproportionately common in SE and SW London. Victorian terraces with original door frames are most at risk — the cylinder is often exposed beyond the door face.
How to Measure a Euro Cylinder — and Why Getting It Wrong Matters
A cylinder that's too long protrudes past your door face. That exposed stub is the snap point burglars target. A cylinder that's too short leaves the bolt mechanism under-engaged. Measuring correctly before ordering is not optional.
Reading the Size Format: Outside / Inside
Euro cylinder sizes are written as two numbers separated by a slash: the outside measurement (from the outer face of the door to the centre of the fixing screw) and the inside measurement (from the centre of the fixing screw to the inner face of the door). So a 40/45 cylinder is 40mm on the outside, 45mm inside, 85mm total.
The cam is always at the centre point. Measure from the outside edge to the centre of the cam screw hole — that's your outside figure. Then from that same centre point to the inside edge.
| Door Type | Typical Total | Common Size | Outside Protrusion | Risk Level |
|---|---|---|---|---|
| Modern uPVC (post-2000) | 85mm | 40/45 Most Common | Flush / 0–1mm | Low |
| Composite door | 85–90mm | 40/45 or 45/45 | Flush / 0–2mm | Low |
| Victorian / Edwardian terrace uPVC | 80–90mm | 35/45 or 40/45 | 0–3mm | Medium |
| Older uPVC with extended cylinder | 90–100mm | 45/50 or 50/50 | 3–5mm+ Exposed | High |
| Timber door with euro profile | 70–100mm | Varies — measure first | Varies | Measure |
The Protrusion Rule
If the outer end of your cylinder extends more than 3mm beyond the door face, it can be snapped with a standard tool. Most reputable locksmiths will flag this and supply a correctly-sized replacement rather than re-fitting the same length. If a locksmith doesn't mention it, ask.
Can't Measure It Yourself?
We measure before we order — every time. When we attend a job we'll measure the door thickness, note the lockcase depth, and confirm whether the handle hardware requires a thumb-turn or standard keyed cylinder on the inside. If you've ordered online and the size is wrong, we carry a range of sizes in the van and can often swap it out on the same visit.
If you want to check your size before calling: find the fixing screw on the edge of your door (usually one central screw through the door face into the lockcase). Measure from the outer door face to that screw, and from the screw to the inner door face. Add 5mm to each measurement if the door has a deep profile. That's the size to quote.
TS007 Star Ratings Explained — What Your Insurer Actually Requires
TS007 is the British Standard that covers attack resistance testing for euro cylinder locks. The rating system runs from 1 to 3 stars. Most home insurance policies require a 3-star solution at the front door.
Snap-resistant cylinder only. Resists snap attacks at the cam groove. Does not cover picking or bumping in isolation. Must be paired with a 2-star handle to satisfy insurance requirements at external doors.
A reinforced handle and escutcheon plate that adds an additional physical layer. The handle covers the exposed cylinder end, eliminating the grip point a burglar needs to apply snap force. Paired with a 1-star cylinder, this achieves the 3-star combined requirement.
A cylinder that passes snap, pick, bump, and drill tests on its own — without a reinforced handle. Brands like Ultion, ABS Avocet, and Mul-T-Lock MT5+ achieve 3 stars as standalone cylinders. The simplest path to compliance.
Does Your Policy Specify TS007?
Most policies issued by major UK insurers (Aviva, Direct Line, LV, Admiral) after around 2015 require BS3621 or TS007 3-star on external doors. The precise wording varies — some say "British Standard approved lock", some specify TS007, some require both a cylinder standard and a handle standard. If you're unsure, check the "Security Requirements" section of your policy schedule before we attend — we can then confirm which cylinder will satisfy the requirement.
If your door is a timber door with a mortice lock, TS007 may not be relevant — that's covered by anti-snap cylinder locks only if the door also has a euro cylinder. Many South London Victorian terraces have a night latch on top and a 5-lever mortice at mid-rail — in that scenario the mortice is the insurance-approved lock and the latch is secondary. See our page on double cylinder locks if your door has keyed cylinders on both sides.
Which Euro Cylinder Should You Choose? Five Brands Compared
Not all anti-snap cylinders are equal. The difference between a budget 1-star cylinder and a 3-star rated one is real, measurable, and visible in break-in statistics. Here's how the main brands differ.
Ultion (Brisant Secure)
TS007 3-star — the benchmark for South London homes
- TS007 Rating3-star
- Snap ResistanceInternal hardened steel bar
- Pick ResistanceMOD-approved sliders
- Key ControlPatented — cannot be copied without ID
- InsuranceAccepted by all major UK insurers
- Price RangeFrom £200 supply + fit
ABS Avocet
TS007 3-star at a lower price point
- TS007 Rating3-star
- Snap ResistanceSacrificial zone with hardened cam
- Pick ResistanceHigh — patent-protected keyway
- Key ControlRestricted key system available
- InsuranceAccepted — Secured by Design approved
- Price RangeFrom £135 supply + fit
Mul-T-Lock MT5+
High-security with telescopic pin technology
- TS007 Rating3-star
- Snap ResistanceHardened steel reinforcement
- Pick ResistanceTelescopic pins — extremely high
- Key ControlPatented — registered card required
- InsuranceAccepted — Sold Secure Diamond
- Price RangeFrom £200 supply + fit
Yale Platinum 3-Star
Wide availability, solid entry-level 3-star option
- TS007 Rating3-star
- Snap ResistanceAnti-snap bars at both ends
- Pick ResistanceMedium — standard pin tumbler
- Key ControlNo restriction — keys cut freely
- InsuranceAccepted
- Price RangeFrom £135 supply + fit
Budget Cylinders — What to Avoid
Cylinders sold for under £10 on Amazon or in DIY sheds are typically standard 6-pin mechanisms with no anti-snap protection. They will satisfy a basic lock-change request but will not meet insurance requirements and will not resist snap attacks. If a locksmith fits one of these and charges a full call-out fee, ask for the TS007 certificate or product spec before paying.
The Anti-Snap Mechanism — What Actually Happens During a Break-In
Understanding how snap protection works helps you understand why it matters — and why a cylinder that "looks the same" may offer completely different protection.
The Standard Cylinder Failure
A standard euro cylinder has a single body made of brass or zinc alloy. The cam — the rotating plate that drives the door latch — sits at the centre point. When a burglar applies a long-handled wrench or pair of channel-lock pliers to the outer stub and twists with bodyweight, the cylinder snaps at its thinnest point: the cam groove. This is typically 3–4mm from the outside face of the cam.
Once snapped, the outer section (with the keyway) drops out or can be pulled free. The attacker then uses a flathead screwdriver to rotate the cam directly. The multi-point locking system retracts all bolts simultaneously. The door swings open. The whole process takes 30–60 seconds with a practised hand.
How the Anti-Snap Cylinder Defeats This
Anti-snap cylinders are engineered with a deliberate sacrificial break point set well outside the cam. When the outer section snaps (and it will — that's the design intent), the break occurs at a pre-determined groove that is positioned far enough from the cam that the remaining inner section cannot be turned with a screwdriver.
Better cylinders go further: a hardened steel reinforcing bar runs through the core alongside the cam. The bar resists the snap force itself, making it harder to initiate the snap in the first place. Premium brands like Ultion also add anti-drill pins (hardened steel at keyway entry points) and anti-pick sliders that change configuration when a non-original key is inserted.
The result: a burglar who attempts a snap attack on a 3-star cylinder gets the outer stub, is left with an exposed but unturnable inner section, and faces a door that is still locked. Most will leave. The attack fails silently, and the remaining cylinder can be replaced the following day.
Key Protection Layers in a 3-Star Cylinder
- Sacrificial break zone positioned outside the cam housing
- Hardened steel reinforcing bar through the cylinder body
- Anti-drill hardened steel pins at keyway entry
- Anti-pick high-security pin tumbler or slider mechanism
- Anti-bump design (no resonance response to bump keys)
- Anti-pull reinforcement — cylinder cannot be gripped and pulled axially
- Restricted keyway — keys require identification to duplicate
Is Your Cylinder Already Exposed?
Stand outside your front door. Look at where the cylinder meets the door face. If the cylinder protrudes more than 3mm — meaning you can see the end of the barrel beyond the door metal — it can be snapped. Many South London front doors in SE4, SE6, SE13 and SW17 have poorly-fitted replacements that protrude 5–8mm. That's not a lock problem, it's an installation problem — and it's fixable by supplying the correct cylinder length.
What About Thumb Turn Cylinders?
Many modern composite doors are fitted with a thumb turn cylinder on the inside — a lever you turn by hand rather than a key. This is convenient (no need to find your key when leaving) but creates a fire safety consideration. If you're locked inside and cannot operate the thumb turn — during a fire, for example — you cannot exit. For properties with vulnerable occupants, a standard keyed cylinder on the inside may be safer. If the door is on an escape route, a thumb turn is typically the preferred option for the same reason.
If you need keyed entry on both sides, a double cylinder lock is the solution — with the same anti-snap protection on both the outer and inner cylinders. We fit both configurations across South London.
Euro Cylinder Services We Carry Out Across South London
Whether you need a basic like-for-like swap, a security upgrade, or an emergency lockout response, we carry the cylinders and tools to complete the job in a single visit.
Euro Cylinder Change
Like-for-like replacement of your existing cylinder. We measure first, supply the correct size, and refit with the original screws or new fixings if required.
From £135Anti-Snap Upgrade
Upgrade to a TS007 3-star cylinder — Ultion, ABS Avocet, Mul-T-Lock, or Yale Platinum depending on your door and budget. Meets all major insurer requirements.
From £200Post-Snap Attack Response
If your cylinder has been snapped in a break-in attempt, we'll assess the door, fit a replacement cylinder and confirm nothing else has been damaged. Available same day.
Call for quoteEmergency Lockout — Cylinder Door
Locked out of a uPVC or composite door? We'll open it non-destructively where possible. If the cylinder itself is the problem, we'll replace it on the spot.
From £120Lost Keys — Cylinder Change
Lost your keys? We change the cylinder rather than hunt for spares — this is the only way to guarantee security when keys are unaccounted for. Send photos via WhatsApp for an accurate quote.
WhatsApp quoteLandlord / Tenancy Change
End of tenancy cylinder change for landlords and letting agents across South London. We change all locks and supply the required number of key copies. Invoice provided.
From £135When to Repair and When to Replace Your Euro Cylinder
Not every stiff lock or sticky key means a new cylinder. But there are clear signs that a replacement is the right call — and waiting can mean a lockout at the worst possible time.
Decision Guide — Repair vs Replace
Try Lubricating / Adjusting First
- Key turns but feels stiff — try graphite spray in the keyway, not WD-40
- Key turns slowly but operates the lock — cylinder may need cleaning
- Lock stiff only in winter — uPVC door may need adjustment, not cylinder
- Key turns but door won't open — likely a door alignment issue, not the cylinder
- One key works fine but another feels different — cutting issue, not cylinder
Replace the Cylinder
- Keys have been lost or stolen — always replace, no exceptions
- Cylinder has been attacked or shows visible damage at the cam area
- Key no longer turns at all — internal mechanism may be seized or broken
- Standard (non-anti-snap) cylinder on an external door
- Cylinder protrudes more than 3mm beyond the door face
- Insurance renewal requires TS007 proof of compliance
- End of tenancy — previous tenant may have key copies
- Cylinder is over 10 years old and has had heavy use
The WD-40 Problem
WD-40 is a water dispersant, not a lubricant. Sprayed into a cylinder it will loosen the stiffness for a day or two, then leave a residue that attracts dust and grit. Within a few weeks the cylinder is stiffer than before. For cylinder lubrication, use a dry graphite spray — no residue, no grit attraction, works at all temperatures. Squirt a small amount into the keyway, insert the key and work it in and out several times.
If the cylinder is stiff because it's been operated tens of thousands of times over years of daily use, lubrication is a temporary fix. At that age the internal springs weaken and the driver pins begin to wear unevenly. A replacement is cheaper than the lockout that eventually follows.
Euro Cylinder Locks for Landlords, Tenants and Letting Agents
Cylinder changes at the end of tenancy are one of the most straightforward but most frequently overlooked security steps in residential lettings. Here's what landlords and tenants need to know.
Landlord Obligations
There is no statutory requirement to change locks between tenancies in England and Wales, but most landlord insurance policies require you to ensure the property is "properly secured" at the start of a new tenancy. If a previous tenant retains a key copy and subsequently enters the property, whether they have legal right to do so depends on whether their tenancy has ended — but your insurer may not pay out if the entry was facilitated by an unchanged cylinder.
From a practical standpoint: key copies are hard to account for. A cylinder change takes under 20 minutes and costs from £135. The alternative — a contested insurance claim after a break-in or theft — costs considerably more in time and excess.
Tenant Rights
Tenants have the right to security in their home under Section 11 of the Landlord and Tenant Act 1985. A cylinder that cannot be secured — because the key has been lost, the cylinder is damaged, or a previous occupant holds a copy — can be argued as a breach of the landlord's repair and maintenance obligations.
If your landlord refuses to change the cylinder when you've reported a security concern, document the request in writing (email or letter). In most cases, landlords respond promptly — it's their insurance liability as much as yours.
What We Provide for Landlords
- Cylinder change with same-day availability across South London
- Invoice provided (property address, service date, cylinder spec)
- TS007 certificate for the replacement cylinder on request
- Multiple key copies cut and labelled (specify how many)
- Anti-snap upgrades for landlord insurance compliance
- End-of-tenancy and between-tenancy scheduling available
Can a Tenant Change the Lock Themselves?
Technically yes — a tenant can change their lock, but most tenancy agreements require them to provide a key copy to the landlord and to restore the original cylinder at the end of the tenancy. If the lease is silent on this, the position is less clear.
In practice, we recommend tenants contact their landlord first. In urgent security situations (lost keys, damaged cylinder), a locksmith can attend, change the cylinder, and cut copies for both parties in one visit.
What Happens When You Book a Cylinder Change
Most euro cylinder jobs are straightforward and completed in a single visit. Here's the process from first contact to a working key in your hand.
Call or WhatsApp
Tell us the door type and the issue. If you're unsure of your cylinder size, send a photo of the door edge — we can usually identify the size from the photo.
We Attend
We arrive with a range of cylinder sizes. We measure the door on arrival to confirm the correct size before opening the packaging.
Cylinder Removed and Checked
We remove the existing cylinder and check for any damage to the door frame or lockcase. If there's post-attack damage, we'll advise on what else needs addressing.
New Cylinder Fitted
Replacement cylinder fitted, tested from both sides. Keys cut and checked. TS007 certificate provided if required. Payment by card or cash.
Why Does the Locksmith Measure When They Arrive?
Euro cylinder sizes are rarely labelled on the cylinder itself, and door manufacturers don't always fit the theoretically correct size. We measure because the size installed may differ from what the door specification says — and fitting a cylinder that's even 5mm too long in the outer section creates a snap vulnerability.
If you're ordering a cylinder yourself to supply to us or to a DIY fitter, measure before ordering. The most common error is ordering the total door thickness and splitting it evenly — which doesn't account for the position of the fixing screw or the cam offset. Always measure outside (door face to fixing screw centre) and inside (fixing screw centre to inner face) independently.
Why South London Homeowners Use Us for Cylinder Changes
The locksmith industry has a poor reputation for rogue traders. Here's what we do differently.
We Price Before We Start
Quote confirmed over the phone or WhatsApp before we attend. No price escalation at the door. What we quote is what you pay.
Same-Day Across South London
We cover SE1 to SE28, SW1 to SW20, and CR postcode areas. Most cylinder jobs are completed within 40 minutes of your call.
DBS Checked — Every Time
Every engineer is DBS-checked and fully insured for work on residential and commercial properties. We carry ID and can show it before entering your home.
TS007 Documentation Provided
We supply TS007 certificates and brand spec sheets on request — useful when your insurer asks for proof of compliance at renewal.
5.0 Rating — 155 Reviews
Our Google rating reflects the work, not a marketing promise. Read the reviews — they're from real addresses across South London.
No Hidden Callout Fees
The price we quote includes the callout, the cylinder, the labour, and the keys. There is no separate assessment fee, diagnostic fee, or "premium rate" for same-day attendance.
What Customers Say About Our Cylinder Lock Service
5.0 on Google from 155 reviews. These are from cylinder lock jobs across South London.
"My uPVC door lock had been stiff for months and finally seized. Called at 8am, engineer arrived by 9:30. He measured the existing cylinder, explained it was the wrong length and had been protruding — which I had no idea about. New Ultion cylinder fitted in 20 minutes. Very happy."
"End of tenancy job — needed all three cylinder locks changed and keys cut for new tenants. Sorted same day with invoice included. The engineer explained which cylinders were installed and why — reassuring for a landlord to hear. Will use again."
"Called after noticing my cylinder was protruding beyond the door face. The locksmith arrived quickly, measured it, confirmed it was 6mm out — definitely a snap risk. Fitted an anti-snap replacement at the right length. Reasonably priced and done in half an hour."
Euro Cylinder Lock — Frequently Asked Questions
Questions we're asked on almost every job. If yours isn't here, send it via WhatsApp.
How much does it cost to replace a euro cylinder lock in South London?
How do I know if my euro cylinder is anti-snap?
Can I replace a euro cylinder myself?
Do all insurance policies require TS007?
My key turns but the door won't open — is it the cylinder?
What size euro cylinder do I need?
Can a euro cylinder be picked open?
Related pages you may find useful:
Anti-Snap Cylinder Locks — detailed guide to snap-resistant cylinder standards and brands | Double Cylinder Locks — keyed on both sides | Thumb Turn Cylinder Locks — convenience vs security trade-off explained
Need a Euro Cylinder Changed in South London?
Same-day service. TS007-rated cylinders. No hidden fees. Call now or send a WhatsApp with your door type and postcode for a quick quote.
24/7 emergency locksmith serving South London since 2015 — trusted by homeowners, landlords and businesses across Sutton, Mitcham, Wallington, Cheam, Purley and surrounding areas.