Lost a car key in Cornwall? The good news: you almost never need to go to the main dealer in 2026. Mobile auto locksmiths cover the whole county and handle the majority of UK car makes — typically 50-70% cheaper than a dealer and usually within 2-4 hours. The bad news: prices vary hugely by manufacturer, key type, and whether you've still got at least one working key. This guide breaks down realistic 2026 costs by make and what determines the price.
The three cost factors
1. Whether you have a working spare
This is the biggest cost driver:
- You have one working key, want a spare: Cheaper job. Locksmith reads the existing key's signal, programs a new transponder, cuts a matching blank. £100-£250 typical.
- You have NO working keys: Much more expensive. Locksmith needs to either pull the immobiliser ECU and read it on a bench, or perform a special "all-keys-lost" procedure via the OBD port. May involve replacement of the immobiliser ECU. £200-£500 typical.
Lesson: if you only have one key, get a spare cut now while it's cheap. Losing your last key is one of the more expensive automotive mistakes.
2. Key type
- Basic transponder key (older cars): £100-£180 cut and programmed
- Remote/flip key: £150-£250
- Proximity (keyless / smart key): £250-£450
- Premium proximity (Range Rover, Audi A6/A8, BMW 7-series): £350-£700+
3. Car make and year
Some manufacturers make key programming easy (Vauxhall, Ford pre-2015, Toyota). Some make it deliberately difficult (Range Rover, Audi post-2015, BMW post-2018) — sometimes requiring the dealer's online connection to authorise a new key.
Typical 2026 costs by make (Cornwall mobile auto locksmith)
| Make | Spare cut + programmed | All-keys-lost |
|---|---|---|
| Ford (most models) | £100-£200 | £200-£400 |
| Vauxhall | £100-£180 | £200-£350 |
| VW (pre-2018) | £150-£250 | £300-£500 |
| VW (post-2018) | £200-£350 | £450-£800 |
| Audi (pre-2018) | £200-£350 | £400-£700 |
| Audi (post-2018) | £250-£450 | £500-£1,000 (dealer often needed) |
| BMW (pre-2018) | £200-£350 | £400-£700 |
| BMW (post-2018) | £300-£500 | £500-£900 (dealer often needed) |
| Toyota / Lexus | £130-£250 | £250-£450 |
| Honda | £150-£280 | £280-£500 |
| Nissan | £130-£250 | £250-£450 |
| Hyundai / Kia | £130-£250 | £250-£450 |
| Peugeot / Citroen | £140-£260 | £280-£500 |
| Mercedes (pre-2017) | £200-£400 | £400-£800 |
| Mercedes (post-2017) | £300-£600 | £600-£1,200 (dealer often needed) |
| Range Rover / Land Rover | £300-£600 | £800-£1,500 (usually dealer-only) |
| Mini | £200-£350 | £400-£700 |
| Fiat | £140-£250 | £280-£450 |
| Ford Transit (van) | £140-£280 | £280-£500 |
Compare to main dealer prices for the same job: typically 1.5-2x higher, plus you have to recover the vehicle to them.
What to bring (or have ready)
- V5C (logbook) or your name on the V5 — locksmiths must verify ownership before cutting new keys. Photos OK in most cases.
- Photo ID matching the V5
- The car (obviously) — or a way to get to it. If your last key was lost, the car must stay where it is; the locksmith comes to it.
- Any old / damaged keys — sometimes useful for cloning, even if they don't work the immobiliser
- Make, model, year, VIN — VIN is on the dashboard under the windscreen (passenger side) and in the V5
Mobile vs main dealer — when which makes sense
Mobile auto locksmith — almost always
- 50-70% cheaper than dealer
- Comes to your driveway / car park / wherever
- Usually same-day or next-day
- Handles most makes and years up to ~2020
Main dealer — only when
- Premium brands (Range Rover, Audi/BMW/Mercedes post-2018+) where the manufacturer's online security system requires dealer authentication
- Cars under PCP/lease where the lease company specifies dealer-only servicing
- Specific transponder/smart-key types not yet supported by aftermarket programmers
Even when the dealer is needed, a mobile locksmith can often quote first and tell you whether they can do it — saves you a wasted trip if not.
What can go wrong
Cheap online keys
Don't buy "blank" or "compatible" keys off eBay/Amazon to save money. A high proportion are non-functional, wrong chip type, or won't program with aftermarket equipment. A locksmith bringing the correct OEM or genuine-clone blank is part of the cost. £150 saved on a bad key = £300 wasted trip.
Hybrid and EV complexity
Some hybrids and EVs (Toyota Mirai, certain Nissan Leaf models, MG ZS EV) use different security architectures. Confirm the locksmith covers your specific model before booking.
"My car is too old for a key"
Very old cars (pre-2000) often use a basic cut metal key with no transponder. £15-£40 from any key-cutter; doesn't need a locksmith. The trade-off: no immobiliser = easier to steal. Worth fitting an aftermarket immobiliser if your old car is at risk.
Spare-key insurance angle
Some car insurance policies include "key cover" — pays for replacement if you lose or break your only key. Limits typically £500-£1,500. Check your policy schedule.
Need a car key cut and programmed in Cornwall? Submit your postcode — we connect you with a Cornwall mobile auto locksmith who'll come to your car, quote up-front, and usually finish in 60-90 minutes.
Frequently asked questions
How much does a replacement car key cost in Cornwall?
£100-£250 typically if you still have one working key (locksmith reads it and cuts a programmed spare). £200-£500+ if you've lost all keys (locksmith does an 'all-keys-lost' procedure, sometimes including immobiliser ECU work). Premium brands (Range Rover, Audi/BMW/Mercedes post-2018) are £400-£1,500.
Is a mobile auto locksmith as good as the main dealer?
For most mainstream makes up to about 2020 model year, yes — and 50-70% cheaper. Dealers are usually only essential for premium brands post-2018 (Range Rover, Audi/BMW/Mercedes high-end) where the manufacturer's online security system requires dealer authentication.
What do I need to bring to a car key job?
V5C (logbook) or photo proof, photo ID matching the V5, the car (or directions to where it's parked), make/model/year/VIN. Bring any old or damaged keys — sometimes useful for cloning even if they don't work the immobiliser.
Can I buy a cheap key off eBay and program it myself?
Almost never works. Non-functional 'compatible' keys are common, wrong chip types are common, and aftermarket programming equipment costs more than a locksmith visit. £150 saved on a bad key usually equals £300 wasted on a re-do.
How long does a car key job take in Cornwall?
Spare key (existing key working): 30-60 minutes. All-keys-lost on a mainstream make: 60-120 minutes. Premium brands or complex jobs: 2-4 hours. Most Cornwall mobile auto locksmiths can come same-day or next-day for booked work.