Lock Change Norfolk — Insurance-Grade Locks Fitted Same Day

Lock Change Norfolk — 24/7 Locksmith Service

A lock change is the single most reliable way to know exactly who can open your front door. If you’ve moved in, lost your keys, split with a partner, had a break-in or simply realised your locks are decades old and worn, we’ll swap them out the same day across Norfolk — Norwich, Cromer, Sheringham, the coast and the rural villages — using kitemarked, insurance-approved locks. Two brothers, fully qualified, DBS-checked, family-run.

When you need a lock change

You’ve just moved in — no idea how many keys are floating around with previous owners, estate agents, cleaners, neighbours or the family who lived there before. Always change locks on completion day.
Lost or stolen keys — particularly if your address was on the keyring or in the same bag. Don’t gamble; rekey or replace.
Separation or divorce — an ex-partner with a key is the most common “should-have-changed-it” call we get. We’re discreet and quick.
After a burglary or attempted break-in — locks may look fine but the internals can be compromised. Insurance often insists on a full change.
Upgrading to BS3621 for insurance — if your renewal flagged you don’t meet British Standard, we’ll bring you compliant.
Sticky, worn or stiff locks — a lock about to fail is far more expensive than one you replaced in advance.
Modernising old timber doors — moving from a single 5-lever mortice to a combination with a high-security nightlatch.
Downsizing or letting out a property — clean break, new keys, no mystery copies.
End of a tenancy — standard good-landlord practice between lets.
Lost confidence in a tradesperson who’s had access to your keys.

What’s included in a lock change

Full survey of every external door — front, back, side, patio, garage personnel door.
Removal of the existing lock, careful of timber finish or composite door skins.
Supply and fit of the new kitemarked lock (you’ll see the box and the standard before we open it).
Adjustment of strike plates and keeps so the door closes and locks smoothly.
Three keys per cylinder as standard (more on request — sensible if you’ve kids, a cleaner or family staying).
Demonstration so you and anyone else in the house knows how it operates.
Tidy-up — sawdust, old screws and packaging all taken away.
Written breakdown of what was fitted and the standard it meets — handy for your insurer.

Locksmith standards explained — in plain English

The British and European standards on your locks aren’t just letters and numbers. They decide whether your insurer pays out after a break-in, and they’re the first thing a careful locksmith checks. Here’s what each one actually means for your front door.

BS3621 — the British Standard insurers ask for on timber doors. It means the lock has been independently tested against drilling, picking and forced entry for a minimum time, and that the key cannot be removed when the door is unlocked. Look for the kitemark stamped on the faceplate.
BS8621 — same test bar, but designed for fire escape routes (flats, HMOs, communal exits). It allows keyless exit from the inside in an emergency. Don’t mix these up — a BS3621 on a flat door can breach fire regulations.
BS10621 — a dusk-to-dawn variation that allows keyed deadlocking from the outside at night, while still permitting emergency exit during the day. Useful on student lets and shops with living quarters above.
TS 007 — the cylinder rating for uPVC and composite doors. One star is basic, two stars is mid-range, three stars is the gold standard with built-in anti-snap, anti-pick, anti-bump and anti-drill protection. Most insurers now want three star, or one star paired with a Sold Secure handle.
SS 312 Diamond (Sold Secure) — an enhanced cylinder rating that goes beyond TS 007 three-star testing. Avocet ABS, Brisant Ultion and ERA Fortress all carry it. If you’ve had a snap-attack attempt or you’re in a higher-risk area, this is what we’d fit on our own door.
Anti-snap — a sacrificial line cut into the cylinder so that if a burglar tries to break it with mole grips, only the outer section snaps and the lock stays secured.
Anti-pick — extra pins, sidebars or rotating discs that defeat lock-picking tools.
Anti-bump — pin profiles or sprung followers that stop bump keys from setting the cylinder.
Anti-drill — hardened steel inserts that blunt drill bits before they reach the pin chamber.

Lock brands we work with in Norfolk

We carry stock from the brands UK insurers know and trust. We’ll always tell you which range fits your door, your insurance schedule and your budget — never push the most expensive option for the sake of it.

Yale — household name, full range from basic nightlatches to Platinum 3-star cylinders. Widely accepted by every UK insurer.
ERA — British manufacturer, very strong on BS3621 mortice deadlocks and the Fortress 3-star anti-snap cylinder.
Chubb (now part of Assa Abloy) — gold standard for traditional mortice deadlocks; the 3G114E is the lock most insurers picture when they say “5-lever British Standard”.
Banham — premium night-latch and mortice combination; commonly specified on London-style timber doors but found on higher-end Norfolk properties too.
Mul-T-Lock — Israeli-engineered, patented restricted keyways. The choice when you want strict control over who can cut a copy.
Avocet (ABS range) — the original SS 312 Diamond 3-star cylinder. A go-to for uPVC and composite doors in Norfolk where snap-attacks have been reported.
Brisant Ultion — has a hidden second lock that engages when an attack is detected. Insurance-friendly and our pick for clients who want belt-and-braces.
Squire — heritage British padlocks and high-security padlocks for outbuildings, sheds and gates.
Kasp — solid mid-range padlocks and security accessories, good value for garages and storage.
ASEC — workhorse trade brand; reliable mortice locks, sashlocks and ironmongery where a kitemarked replacement is needed quickly.
ERA Fortress — 3-star anti-snap cylinder with a strong lifetime guarantee; popular on family homes.

Insurance considerations

Most UK home insurance schedules have a quiet little clause that says your front and back doors must carry a kitemarked British Standard lock. After a break-in is the worst time to discover yours doesn’t. Here’s what the big Norfolk-relevant insurers typically ask for — but always check your own policy wording, because clauses do change.

Aviva — usually require BS3621 5-lever mortice deadlocks on timber doors and at minimum a TS 007 1-star cylinder (paired with a 2-star handle) on uPVC. 3-star cylinders satisfy them outright.
AXA — similar BS3621 requirement on final exit timber doors; for uPVC they accept 3-star cylinders or a 1-star cylinder plus 2-star handle.
Direct Line — BS3621 on timber, plus key-operated locks on accessible windows. uPVC must be anti-snap rated.
Admiral — BS3621 mortice or a kitemarked nightlatch with deadlocking on timber. uPVC cylinders should be anti-snap (TS 007 3-star or SS 312 Diamond).
NFU Mutual — common in rural Norfolk; they’re stricter on outbuildings and barns, often expecting CEN-rated padlocks and shed alarms, plus BS3621 on the dwelling.

If you’ve recently switched insurer, dig out the schedule and read the security requirements section before something goes wrong. If you’d like a second pair of eyes, we’ll happily walk through your wording with you when we arrive.

On a lock change we’ll always confirm the rating before fitting, and put it in writing for your records.

Timing expectations

Honest ranges, not promises:

Single cylinder swap on uPVC — typically 20 to 40 minutes once we’re at the door.
Single 5-lever mortice change on timber — typically 45 to 90 minutes, depending on whether the mortice pocket needs adjusting.
Full house lock change (3–4 doors) — typically 2 to 3 hours.
Insurance upgrade across the whole property — half a day is sensible to plan for.

Travel time across Norfolk varies. Norwich and the immediate ring road are usually quickest; the coastal villages and the rural belt towards Thetford take longer. We’ll give you a realistic ETA when you call.

Identification we show on arrival

One of us — Alan or his brother — will arrive in a sign-written van and offer ID at the door before we touch anything. You should always ask, and we’d rather you did. Here’s what we carry:

DBS-checked photo ID — Disclosure and Barring Service certificate, so you know who you’re letting near your locks.
Photo trade badge — with our name, photo and business details.
NCFE Level 3 Locksmith qualification — full UK industry qualification, not a weekend course.
Public Liability Insurance — so if something does get damaged, you’re protected. Certificate can be emailed before we arrive on request.

If anyone ever turns up claiming to be a locksmith and can’t show you these things, don’t let them in. Phone us and we’ll come instead.

When you should NOT DIY a lock change

We’d never tell you not to learn a skill, and a confident DIYer can swap a euro cylinder on a uPVC door if the measurement is right. But here are the situations where it’s a false economy:

You’re unsure of the exact cylinder length — fitting one that protrudes more than 3mm is an open invitation to snap-attack.
The lock is a multi-point mechanism (most uPVC and composite doors) — the gearbox is the expensive part, and forcing the wrong cylinder can wreck it.
It’s a BS3621 mortice — the mortice pocket needs to be the right depth and the keep plate aligned. A poor fit will jam within weeks.
You need a kitemarked certificate for insurance — a self-fit doesn’t always satisfy the insurer if there’s no paperwork.
You’re locked out and tempted to drill — drilling the wrong part voids any chance of a non-destructive entry.

What to prepare before we arrive

Decide how many keys per lock you’ll need (three is standard).
If it’s an insurance upgrade, have the schedule to hand so we can match exactly what’s specified.
Move pets to a back room if they’re nervous of strangers.
Clear a metre or so in front of each door for our toolbox.
If you’ve a porch or gate that needs unlocking first, let us know.

Aftercare and guarantee

Every lock we fit is covered by the manufacturer’s warranty (typically 1 to 10 years depending on brand) and by our own workmanship guarantee on the fitting. If anything we’ve installed misbehaves within 12 months and it’s down to the fit rather than abuse, we’ll come back and put it right at no charge. Keep one spare key off-site (with a trusted family member or in a secure key safe) — it’s the cheapest insurance against a future lockout.

Common mistakes customers make

Only changing the front door — back doors and patio doors get forgotten and are often the weakest link.
Buying the cheapest cylinder online and asking us to fit it — many are unbranded and won’t satisfy insurance.
Measuring a euro cylinder wrong — it’s measured from the centre screw outwards on each side, not end to end.
Forgetting the garage personnel door — often a direct route into the house from a poorly secured side door.
Not asking for the kitemark certificate — you’ll want it the day you make a claim.

Frequently asked questions

Should I change locks every time I move house?

Yes, on every external door. You have no way of knowing how many keys exist or who has them. It’s a small cost for genuine peace of mind.

Can you just rekey, rather than replace, the lock?

On many cylinders and some mortice locks, yes — we can replace the pins or levers so old keys no longer work. We’ll recommend it where it makes sense and saves you money.

How do I know the new lock meets my insurance requirements?

We’ll show you the kitemark on the lock body, leave the original packaging with you, and give you a written note of the British Standard met. Pop that with your insurance documents.

Do you supply restricted keys so copies can’t be cut at a kiosk?

Yes — Mul-T-Lock, Yale Platinum and Avocet ABS all offer patented restricted profiles. Only authorised cutters can copy them, and only with your written consent.

My door is a bit warped — can you still change the lock?

Usually yes. We’ll adjust the strike plate or keep so the new lock engages cleanly. If the door itself is past saving we’ll tell you honestly rather than fit a lock to a door that won’t close properly.

Do I need to be home for the whole job?

We’d prefer it, so you can choose your key configuration and we can demonstrate the lock. If you’ve got to nip out we can work around it as long as someone trusted is on site.

Will changing locks damage my door?

No. A proper lock change leaves no visible scars on the door face. The only marks are inside the mortice or cylinder housing where the new lock now sits.

Do you work on listed buildings and period properties?

Yes. We’re careful with original timber, hinges and ironmongery, and we’ll specify locks sympathetic to a heritage door.

Related services and areas we cover

Other locksmith services: Lockout · Key cutting · uPVC door locks · All services · FAQ

Norfolk areas: Norwich · Cromer · Sheringham · Holt · Fakenham

24/7 emergency locksmith — covering Norfolk

If you need a lock change in Norfolk — Norwich, Cromer, Sheringham, Holt, Fakenham, North Walsham, Wymondham, Dereham, Aylsham, Great Yarmouth, Diss or anywhere in between — pick up the phone. One of the brothers will answer, give you a straight answer and a realistic ETA, and be on the way.

Call 07846 643176 — 24 hours a day, 7 days a week, covering all of Norfolk.

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