Lost Your House Keys in Cornwall? What to Do Next (2026)

Lost keys are one of the more stressful "minor" emergencies — especially when you can't remember where you last had them. Most lost-key situations resolve in one of three ways: the keys turn up within 48 hours, you cut a spare from an existing key, or you accept they're gone and change the locks. This guide walks through which option fits your situation, what each costs, and the insurance considerations most people miss.

Step 1: Retrace and wait

Around 60% of lost keys turn up within 48 hours — usually in a coat pocket, jacket lining, car footwell, or wherever you last had them. Before spending money:

• Check every pocket of every jacket, coat, and bag you've used in the last 7 days
• Check car footwells, glove box, and between seats
• Check the house — sofa cushions, kitchen worktop, the spot you put things "for a second"
• Call the last few places you visited (pub, gym, supermarket lost property)
• Check the Cornwall Council lost property if you reported online or were near civic buildings

Step 2: Assess the risk

The key question: could whoever finds them connect them to your address?

• Bare key on a plain ring: Very low risk. A random stranger has no idea what house it opens.
• Key with a fob saying "13" or "Rose Cottage": Higher risk. Someone could shortlist properties.
• Key with an address label, business card, or postcode tag: High risk. Treat as compromised.
• Key with a car-park ticket showing where you parked: High risk, especially if your home is the closest residential area.

Step 3: Decide — change, rekey, or just cut a spare?

Just cut a spare (low-risk situations)

If the keys had no identifying info and you've waited 48 hours, cutting a spare from your remaining key (or the spare you keep with a neighbour) is the cheapest option. Cost: £3-£10 per standard key, £15-£40 for high-security keys (Avocet, Ultion). Most Cornwall towns have a Timpsons or independent key cutter who'll do it while you wait.

Rekey the cylinder (medium-risk situations)

"Rekeying" means a locksmith opens the cylinder and re-pins it so old keys no longer work — without replacing the whole cylinder. Cost: £40-£80 per cylinder. Faster and cheaper than full replacement but only available on certain lock types. Most modern euro cylinders can be rekeyed; older locks often can't.

Change the locks (high-risk or post-burglary)

Full cylinder or lock replacement. The lost keys become useless. Cost per external door:

• Standard euro cylinder: £80-£140 fitted
• Anti-snap upgrade (TS007 3-star): £100-£180 fitted
• BS3621 mortice lock: £120-£200 fitted

For a typical 3-bed Cornwall home with two external doors, a full lock change is £200-£400. If you're upgrading to anti-snap cylinders at the same time, no extra labour cost — just the part difference.

The insurance angle

Two scenarios where insurance matters:

1. Burglary after lost keys. If your keys are lost with identifying info and you fail to change the locks, then your home is burgled via the lost keys, insurance may refuse the claim on the basis that you failed to take reasonable precautions. Worth changing locks promptly if there's any risk.
2. Lost key replacement cover. Some home insurance policies include "lost key cover" that pays for lock change or rekeying. Check your policy schedule — it's often listed under "additional cover" or "home emergency". Limits typically £300-£500.

Special case: lost keys with a car key on the same ring

If your house key was on the same ring as a car key, things get expensive. Modern car keys are typically £150-£400 to replace (depending on make), need reprogramming, and if you've lost the only working key you may also need an ECU reset. See our lost car keys guide. The good news: most Cornwall mobile auto locksmiths handle the car side; you can deal with both losses in the same callout.

Preventing the next one

1. Cut a spare and keep it with a trusted neighbour (not under a flowerpot — burglars know all the spots).
2. Use a key tracker (Tile, AirTag). £25-£35 and finds keys via your phone within 30 feet.
3. Don't put your address on the keyring. If you must, use a phone number or PO box instead.
4. Consider a smart lock as a backup. Code-based entry means you're never fully locked out, even if you lose physical keys. See our smart locks guide.

Just lost your keys and need a lock change in Cornwall? Submit your postcode and we'll match you with a local locksmith — usually within minutes, and most will quote up-front on the phone.

Frequently asked questions

Should I change my locks if I've lost my keys?

Depends on whether the lost keys could be connected to your address. Bare key with no identifying info: low risk, cut a spare and wait. Key with a fob, address, or business card attached: change the locks — and notify your insurer if it might affect future claims.

How much does it cost to change locks in Cornwall after losing keys?

£80-£140 per standard euro cylinder, £100-£180 per anti-snap upgrade, £120-£200 per BS3621 mortice. Typical 3-bed home with two external doors: £200-£400 total. Some home insurance policies cover this under 'lost key cover' — check your policy schedule.

What's the difference between rekeying and changing a lock?

Rekeying re-pins the existing cylinder so old keys no longer work (the lock stays in place). Changing replaces the whole cylinder or lock. Rekeying costs £40-£80 per cylinder; changing costs £80-£200. Not all locks can be rekeyed — most modern euro cylinders can, older locks often can't.

Will my insurance pay for lock changes after lost keys?

Some policies include 'lost key cover' (typically £300-£500 limit) under additional cover or home emergency. Check your schedule. Standard policies don't usually cover it unless it's tied to a burglary.

What if I find the lost keys after I've changed the locks?

The old keys are now useless — they don't operate the new cylinders. Throw them away, or keep them as a curiosity. The cost of the lock change isn't refundable, but you've gained the security upgrade you needed.