The short answer
The biggest cost factors are whether you still have a working key, what kind of key your car uses, how the car's security handles new keys, and whether the car can be driven to the work or the work must come to the car.
A spare fob for a common car, made while you still have one working key, sits at the lower end. An all keys lost smart key for a newer vehicle with tighter security, parked somewhere it cannot be towed easily, sits at the higher end. Most jobs fall somewhere between, and the factors below explain where.
We do not publish flat prices on this page, because they would be misleading. The same words, lost key fob, cover jobs that differ several times over in time, parts and equipment. What we can do is explain the factors, so that when you call us or anyone else, you know which questions matter and what an honest quote should include.
The factors
Everything that moves the price.
| Factor | Lower cost end | Higher cost end |
|---|---|---|
| Working key available | Yes, adding a spare | No, all keys lost |
| Key type | Separate remote, basic transponder key | Smart proximity fob, high security blade |
| Vehicle security design | Straightforward programming | Extra security steps, waiting periods, or dealer only procedures |
| Fob source | Common part, readily available | Scarce or specialist part |
| Blade | Standard edge cut or none | High security side cut, code or lock decoding needed |
| Location of the car | At home or work, easy access | Remote roadside, tight garage, or needs a tow elsewhere |
| Time | Booked daytime visit | Late night or holiday emergency |
| Lost key erasure | Not needed, lost key harmless | Needed, stolen key must be removed |
Factor one
Spare versus all keys lost.
The single largest difference.
If you still have one working key or fob, replacing a lost one is a spare key job. The blade can be copied from the existing key, and the car's security system can usually be put into a mode that learns new keys while it can see the existing one. It is quicker and involves fewer steps.
If every key is gone, the job changes. The blade has to be produced without an original, by cutting it from the vehicle's key code or by decoding one of the car's locks. The car has to accept a new key with no existing key to authorize it, which on many vehicles involves a longer security procedure. On some newer models, it involves steps that only a dealer can perform. Ownership also has to be verified carefully, since there is no key to show.
That is why the most effective way to lower the cost of losing a key is to never be down to one. If you have one key today, a spare now costs less than an all keys lost job later. Our spare key guide goes further.
Factor two
What kind of key your car uses.
Separate remote. Older vehicles often have a metal transponder key plus a separate remote. If only the remote is lost, you may not need a locksmith at all, since some remotes can be paired by an owner procedure. If the key is lost, it is a transponder key job, which is simpler than a fob.
Remote head key. Blade, chip and buttons in one head. Costs more than a plain transponder key because the part costs more and both the chip and the remote need programming.
Flip key. Similar to a remote head key. Some flip keys are relatively common parts, others are specific to a make and cost more.
Smart proximity fob. Usually the most expensive part and the most involved programming. Push button start vehicles rely on the fob for entry and starting, so the fob and its programming are both more sophisticated.
High security blade. Keys cut along the side of the blade, sometimes called laser cut, need a different cutting machine and more careful work. They are common on many newer vehicles of most makes, including hidden emergency blades inside smart fobs.
Factor three
The vehicle's security design.
Two cars from the same year can differ greatly in how they accept new keys. Some vehicles let a new key be added in a few minutes with the right equipment. Others build in a waiting period, sometimes a lengthy one, before the car allows security access. Others require online authorization from the manufacturer, or restrict certain procedures to dealer systems.
These differences are the manufacturer's choices to deter theft, and they are why a locksmith asks for the make, model and year before quoting. It is not about charging more for a luxury badge. It is about how much time and which equipment the job actually needs.
On a small number of vehicles, especially very new models, the honest answer is that the dealer is the only route for all keys lost. A reputable locksmith will tell you that on the phone rather than coming out and discovering it at the car.
Factor four
Where the car is.
Moving a car without a key is its own cost.
When the key is lost, the car usually cannot be driven. If the job is done at a dealer, the car has to be towed there, and the tow is part of the real cost even though it will not appear on the dealer's key invoice. Depending on the distance and whether the car is in a parking garage or a tight spot, towing can be significant.
A mobile locksmith brings the equipment to the car, so there is no tow. That is one of the main reasons people call a locksmith for all keys lost jobs even when the dealer is nearby. For a car stuck in a garage in Wilmington, in a lot at Christiana, or at the end of a farm lane in Kent County, it often makes the difference.
Timing also matters. A booked daytime visit usually costs less than an emergency call late at night. If the car is safe where it is and you have another way to get around, waiting until morning may lower the cost. If you are stranded, it may not be an option, and that is exactly what a 24 hour line is for.
Dealer, locksmith, or online
Comparing your options honestly.
The dealer. Can make keys for the vehicles they sell, has access to manufacturer systems, and uses original parts. The car usually needs to be at the dealer, service hours apply, parts may need ordering, and towing is on you if there is no key. For some very new vehicles, the dealer is the only option.
A mobile locksmith. Comes to the car, often the same day and outside business hours, and handles a wide range of vehicles with dedicated equipment. Parts may be original or quality aftermarket, and a good locksmith tells you which. Some vehicles are outside what a locksmith can do, and a reputable one says so.
Buying a fob online. Can lower the parts cost, but brings risks: the wrong part for your trim or year, a used fob locked to another vehicle, or a poor quality unit that will not program. You still need cutting and programming. It can work well if you confirm the exact part first. Our key fob replacement page covers what to check.
Comparing on the key price alone misses the tow, the time without the car, and the risk of a part that does not work. Compare the whole cost of getting back on the road.
The quote
What an honest quote looks like.
An honest quote for a lost fob comes after questions, not before. Expect to be asked the make, model and year, whether the car has push button start, whether you have any working key, where the car is, and whether the lost key could be in the wrong hands.
The quote should cover the whole job: the fob or key, cutting the blade, programming the immobilizer and the remote, travel, and erasing lost keys if needed. Ask directly whether anything could be added once the technician arrives, and under what circumstances.
Be wary of a very low headline price given before any questions. A common pattern in the locksmith trade is a low figure on the phone that turns into a much larger bill at the car, with charges for things that were always going to be part of the job. Our locksmith scam guide explains the pattern and how to avoid it.
A good sign is a company that tells you when your job is not one they can do, or when the dealer would be better. That honesty costs them the job and saves you a wasted visit.
Lowering the cost
Practical ways to spend less.
- Search thoroughly first. Coat pockets, bags, the car itself if it is unlocked, the last few places you went. Call the shops and venues you visited. Keys turn up more often than people expect.
- Check for a spare. Family members, a drawer at work, the paperwork folder from when you bought the car. A spare found is a far cheaper job, or no job at all.
- Check your coverage. Some auto insurance policies, roadside assistance plans, extended warranties and credit card benefits include key replacement or lockout help. Read the terms or call before paying.
- Have the car's details ready. Make, model, year and VIN let a locksmith quote accurately and bring the right part.
- Book daytime if you can wait. If the car is safe and you have other transport, a scheduled visit usually costs less than an emergency one.
- Get two keys while we are there. Adding a second key in the same visit costs much less than a separate visit later, and it prevents a future all keys lost job.
The day itself
What happens when the technician arrives.
Knowing the steps helps you spot padding.
On a typical lost fob visit, the technician first confirms the vehicle and checks your ID against the registration or title. If there is no working key and the car is locked, they open it without damage. Next comes the blade, cut from a working key, from the vehicle's code, or by decoding a lock. Then programming equipment is connected to the diagnostic port and the new fob is added to the car's accepted keys, followed by pairing the remote functions if that is a separate step. Finally, everything is tested: locking, unlocking, the trunk, the start, and any other keys you still have.
Each of those steps is part of the normal job. If the phone quote covered the whole job, none of them should appear as a surprise extra. Where something genuinely unexpected comes up, such as a damaged ignition or a door lock that has seized and cannot be decoded, a good technician stops, explains it, and asks before doing more.
Hidden costs
The costs that never appear on the invoice.
When people compare options, they tend to compare the price of the key. The real cost of a lost fob includes several things that never appear on any invoice, and they are often larger than the difference between two quotes.
Time without the car. A dealer route that needs a part ordered can leave you without a vehicle for days. That may mean rides, rental cars or missed work.
Towing. Covered above, but worth repeating, because it is the most commonly forgotten cost of the dealer route when there is no key.
Parking. A car stuck in a paid garage in Wilmington or at an airport lot keeps costing money every day it sits there.
Risk from a stolen key. If the lost fob could be in the wrong hands, every day before it is erased is a day the car can be opened and driven by someone else.
Weighing these honestly is often what tips people toward the option that gets the car working today, even when another route looks slightly cheaper on paper.
Scenarios
Common situations, and where they usually fall.
| Situation | Relative cost | Why |
|---|---|---|
| Lost separate remote, still have the key | Lowest | Remote only, car still starts |
| Lost one of two transponder keys | Low | Spare key job with an existing key present |
| Lost one of two smart fobs | Moderate | Costlier part, but the existing fob simplifies programming |
| Lost only transponder key, older car | Moderate | All keys lost, but a common system |
| Lost only smart fob, newer car | Higher | All keys lost, sophisticated part and security procedure |
| Lost only key, dealer only vehicle | Highest | Dealer procedure plus towing |
The cheapest lost fob is the one that never becomes all keys lost
Nearly every expensive lost key job we see started as a car with one key. If that is your car, the best money you will spend on it this year is a spare.
Delaware specifics
What we see around here.
Used cars sold with one key. Across both counties, many used vehicles change hands with a single fob. The second one was lost by a previous owner and never replaced. Buyers often do not notice until the only fob is gone.
University and commuter losses. Around Newark and Wilmington, fobs are lost on campus, at train stations and in parking garages, where towing is awkward and a mobile job saves real money.
Rural Kent County. Long distances to dealers make towing costly. Farm trucks with older transponder keys are often straightforward, while newer pickups with smart fobs are more involved.
Military moves near Dover. Keys go missing during moves, and families often need a replacement before a long drive. Getting a spare before moving day avoids that scramble.
The short version, if you read nothing else
The price depends on whether you have a working key, what kind of key the car takes, how the car's security handles new keys, and where the car is. Get a quote after questions, compare the whole cost including towing, and keep two keys from now on.
Related
The neighbouring guides.
If you want to understand the chip side, see how transponder keys work. For the decision between dealer and locksmith in more depth, see dealer versus locksmith.
Where we do this
Lost fobs replaced across both counties.
Questions
About the cost of a lost fob.
Why will nobody give me a price without asking questions?
Because the job varies so much. The key type, whether you have a working key, the vehicle's security design and the car's location all change the time and parts needed. A price given without those answers is a guess, or a low figure designed to get a technician to your car.
Is a locksmith cheaper than the dealer?
Often, especially when you count towing for a car with no key. For some very new vehicles, the dealer is the only option. Compare the whole cost of getting back on the road, not just the key.
Does insurance cover a lost key fob?
Some policies, roadside plans and warranties include key replacement. Many do not. Check your terms or call your provider before paying.
Can I save money by buying the fob online?
Sometimes. Confirm the exact part number and that it is new and unlocked. A wrong or locked fob wastes money and time.
Why does all keys lost cost more?
The blade must be produced without an original, the car must accept a key with no existing key present, and ownership must be verified carefully. It simply involves more steps.
Should I get two keys made?
Yes. A second key in the same visit costs far less than a later separate visit, and it prevents the most expensive situation, losing your only key.
Will the lost fob still work if someone finds it?
Yes, until it is erased from the car's memory. If it could be in the wrong hands, ask for it to be removed when the new fob is programmed.
Can I wait until morning to save money?
If the car is safe and you have other transport, a scheduled visit usually costs less. If you are stranded somewhere unsafe, do not wait.