Whether you have lost a key, broken one, or simply want a spare, you do not need to leave your car with a main dealer for days. A mobile auto locksmith replaces car keys near you across London - cutting and programming a new key at the kerbside, usually the same day, for a fixed price agreed before any work starts. This guide covers the three common situations, the realistic costs, and how to make sure you are dealing with a legitimate locksmith.
The three situations - and what each one means
You want a spare (you still have a working key)
The cheapest and quickest job. With one working key present, a new key is cut and programmed in 20-40 minutes. Keeping a spare at home is the single best way to avoid the far more expensive all-keys-lost call later on.
One key lost or stolen (one still works)
A replacement is cut and programmed, and the missing key is wiped from the immobiliser so it can no longer start the car. That last step matters after a theft - most insurers expect the lost key to be invalidated.
All keys lost
More involved, but still resolved on-site for almost every car. The locksmith reads the immobiliser through the OBD port, generates a key from the car's own security data and pairs it from scratch. The full sequence is in the dedicated all-keys-lost guide.
How mobile, same-day replacement works
Everything a main dealer does in a workshop, a mobile auto locksmith carries in the van. The job follows four simple steps wherever your car is parked:
- Call with your details. Make, model, year, location and what happened to the keys. You get a fixed price and an arrival time.
- Prove ownership at the car. V5C logbook plus photo ID matching the registered keeper, before any work begins.
- Cut and programme. The blade is cut to the lock or VIN, and the chip is paired to the car through the OBD port with dealer-grade equipment.
- Test and erase. All functions tested; any lost or stolen keys wiped from the immobiliser.
Car key replacement costs in London (2026)
Realistic ranges from an independent London auto locksmith, with a fixed price quoted up front and no separate call-out fee.
| Job | Typical price | What changes it |
|---|---|---|
| Spare key (one working key present) | £90-£200 | Make, transponder vs proximity key |
| Replacement key (one lost, one works) | £150-£280 | Whether a stolen key needs wiping |
| Proximity smart key (spare) | £150-£350 | Newest keyless systems at the top end |
| All keys lost - transponder car | £250-£450 | Immobiliser generation, make |
| All keys lost - proximity smart key | £350-£600 | Premium and newest models highest |
| Key fob repair (battery, case, buttons) | £40-£80 | Whether the chip needs transferring |
Only need a fob fixed rather than a new key? See car key fob repair. For the wider trade context, see the London locksmith pricing guide.
Makes and models we replace
A well-equipped mobile auto locksmith covers virtually every make on UK roads - Ford, Vauxhall, Volkswagen, BMW, Mercedes, Audi, Toyota, Nissan, Kia, Hyundai, Peugeot, Citroën, Renault, Mini and more - across transponder, remote and proximity smart keys. Some makes have their own detailed guide:
- Ford key replacement in London - Fiesta, Focus, Puma, Kuga, Transit and more
- Vauxhall key replacement in London - Corsa, Astra, Zafira, Insignia
- Kia key replacement in London - Picanto, Rio, Ceed, Sportage, Niro
If your make is not listed, it is almost certainly still covered - get in touch with the year, model and VIN and you will get an honest answer on whether it is a job for a locksmith or, in rare cases, the dealer.
Proving you own the car
Any reputable auto locksmith will ask for the V5C logbook and photo ID matching the registered keeper before cutting a key. This protects you - it is exactly what stops a thief simply ordering a key to a car that is not theirs. If a "locksmith" offers to skip the check, that is a reason to refuse, not a convenience.
Why this beats the main dealer
With no working key, a car cannot be driven, so the dealer route starts with a £150-£300 tow. Then the key has to be ordered (often 3-7 days), and dealer labour is charged on top. A mobile locksmith resolves the same job on-site, the same day, at a fixed price - typically 30-50% less all-in. For the full comparison, including the rare cases where the dealer does win, see auto locksmith vs main dealer.
Frequently asked questions
Can a car key really be replaced at the roadside?
Yes. A mobile auto locksmith carries the blanks, cutting machine and diagnostic equipment in the van, so a new key is cut and programmed wherever your car is parked. There is no need to recover the car anywhere.
How much does car key replacement cost in London?
A spare cut and programmed alongside a working key is typically £90-£200. A replacement when one key is lost is £150-£280. An all-keys-lost job is £250-£450 for most cars, with the newest keyless models higher.
A fixed price is always given before any work starts.
How quickly can you replace a lost car key?
For most London jobs a mobile locksmith can attend the same day, often within a couple of hours. The work itself takes 30-90 minutes depending on whether you still have a working key and how modern the security system is.
What do I need to prove I own the car?
The V5C logbook and photo ID matching the registered keeper. This is standard for any reputable UK auto locksmith and protects against vehicle theft. Anyone offering to skip it should be avoided.
Is a mobile auto locksmith cheaper than the main dealer?
Usually by a wide margin. The dealer route needs the car towed in, adds days of waiting for the key to be ordered, and charges dealer labour on top.
A mobile locksmith resolves the same job on-site, the same day, at a fixed price - typically 30-50% less all-in.
Need a car key replaced in London today?
Bullard Locks is a mobile auto locksmith based in Crouch End, covering North and Central London - including Haringey, Islington, Camden and Barnet. Keys for all makes are cut and programmed where your car is parked, same day, with the price agreed up front and no call-out fee.