Lost Keys
Losing keys is a security decision, not a lock problem
Everything about lost keys turns on one question, and it is not a mechanical one: can whoever has them work out which door they open? A set dropped in a park with nothing else attached is a nuisance and an expense. The same set lost in a wallet with a driving licence in it, or on a fob printed with a flat number, is a stranger holding your address and the means to walk in. Those two situations look identical on the doorstep and need completely different responses.
That is why we start by asking what else was attached and where you think they went, rather than quoting a lock change straight away. If the keys went missing inside your own building and nothing identified you, rekeying the cylinder is often enough and costs less. If they were taken with a bag, or lost anywhere your address was written down, we would change the locks and say so plainly, because the point of the visit is that you stop thinking about it.
There is also the awkward middle case where the keys turn up three days later down the side of the sofa. People delay because of it. Our view is that the cost of acting is known and the cost of waiting is not, and in eight years working across North London we have never had a customer regret securing a door too early. Plenty have regretted the other thing.
How We Handle a Lost Set of Keys
The first question is never which lock you have. It is whether anyone could tie those keys to your front door, because that decides whether this is a rekey, a lock change, or something you can safely sleep on.
Rekeying Rather Than Replacing
Most euro cylinders and many mortice locks can be rekeyed, which means changing the internal pin combination so the old keys no longer work while the lock itself stays in the door. You get a fresh set of keys, the missing ones become useless, and you are not paying for hardware you already own. It suits situations where the lock is in good condition and reasonably recent, and it is usually the cheaper answer when only one set has gone.
Change the Lock InsteadWhen the Locks Should Change
We recommend a full change where the keys went with identification, where a tenancy is ending, where the cylinder is old or already stiff, or where you simply cannot say with confidence where they went. A new cylinder is also the moment to fix a weakness rather than repeat one, so if the door is currently protected by a standard barrel we will talk you through an anti-snap upgrade before fitting anything.
Fit a New CylinderShut Out With No Keys at All
If the lost set was your only way in, the first job is getting you through the door, and that is done non-destructively wherever the lock allows it. Picking or bypassing costs less than drilling and leaves you the option of rekeying afterwards instead of buying a lock under pressure. Once you are inside and warm, the security conversation happens properly rather than on a doorstep in the dark with a phone battery at four per cent.
Locked Out Right NowWhy We Ask What Was Lost With Them
- We ask what was attached before we quote — a fob with a flat number on it changes the advice completely, and it should.
- Rekeying offered where it genuinely suits — if the lock is sound and nothing identified you, we will say so rather than sell a cylinder.
- Written invoice naming the parts fitted — which matters when a landlord, letting agent or insurer asks what was done and when.
- 180-day warranty on locks, lifetime on keys — every replacement set is guaranteed for as long as you have it.
Our Process - What Happens When You Call
- Tell us what went missing with them. Keys alone, or keys plus a bag, purse, phone or anything showing where you live. This single answer shapes everything that follows.
- Say whether you can currently get in. Being shut out makes it urgent tonight. Having a spare inside makes it a booked visit tomorrow at a lower price, and we will tell you which you are.
- Rekey or replace, explained on the doorstep. We look at the cylinder, tell you honestly which option fits, and give you the price for each before anything is touched.
- New set, tested, and the old ones dead. Every new key is tried in the door, and we confirm on the invoice that the previous keys no longer operate the lock.
Why Choose N1 Locksmiths?
You speak to the person doing the job
Explain what happened once, to the engineer who is coming, not to a call centre that will summarise it badly.
Priced on the call, before we travel
Rekeying, a new cylinder and an emergency opening are three different prices, and you hear which applies before we set off.
Advice that sometimes costs us the sale
Where a rekey does the job we will fit a rekey, even though a cylinder replacement would be worth more to us.
180-day warranty on locks, lifetime on keys
New keys are covered for life. If one ever wears, sticks or breaks, bring it back and we replace it.
Paperwork your landlord will accept
An itemised invoice naming the lock fitted and the date, which is what agents and insurers actually ask for.
15–30 minutes across N and NW
Worked from Holloway Road, so if you are standing outside with no keys at all, the wait is measured in minutes.
You will not relax until the door is sorted
Lost keys have a way of following people around the house all evening. Every noise in the hallway, every time somebody walks past the front window. The work itself is short — a rekey or a cylinder swap is usually under an hour — and the difference it makes to the night is out of all proportion to what it costs. Tell us what went missing, whether anything with them showed your address, and whether you can currently get in, and you will have the price before we travel, typically within 15–30 minutes across the N and NW postcodes.
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Securing a door after lost keys usually touches more than one lock. These are the jobs that most often come with it — a cylinder rekeyed or replaced, a back door brought onto the same key, or a spare set cut so the next set going missing is an inconvenience rather than an emergency.
Areas We Cover Across London
We cover N1 to N22 and NW1 to NW11 from 37 Holloway Road in N7, and lost keys are the job where the type of building matters more than the postcode. Flats above shops and converted houses around Angel, Barnsbury, Newington Green and Balls Pond Road usually mean two locks to think about — the communal entrance, which belongs to the freeholder, and your own flat door, which does not. We secure the one you control the same day and give you something in writing for the managing agent about the other. Houses further out towards Archway, Camden Town and the Finchley side more often have a back door, a side gate and a garage on the same ring, and those are the sets where keying alike afterwards saves the next round of this.
FAQs – Lost Keys
I have lost my keys but I can still get in. How quickly should I act?
Sooner if anything with them pointed to your address, and within a day or two even if not. There is no benefit in waiting beyond the hope that they turn up, and the risk sits entirely on your side while you wait. Booking it in daylight is also the cheapest version of this job, so acting early saves money as well as worry.
Do I need to change the locks, or can they be rekeyed?
It depends on what was lost with them and on the condition of the lock. Rekeying changes the pin combination so the old keys stop working, and it is a good, cheaper answer for a sound modern cylinder when nothing identified you. Where keys went with a wallet, a bag or anything showing your address, we would change the lock rather than rekey it.
The keys went missing with my handbag. Is that different?
Yes, and treat it as urgent. A bag usually contains something with your address on it, which turns anonymous lost keys into a specific address plus working keys. We would change the front door cylinder that day, and we would look at any communal or back door the same set operated rather than only the one you use most.
What if the keys turn up after you have changed the lock?
They will not open it, which is the point. It feels wasteful and we understand that, but the alternative is a set of live keys in unknown hands and no way to know. If it helps, keep the old cylinder — some customers keep it for a garage or shed door where the security requirement is lower.
I am a tenant. Am I allowed to change the lock?
Almost always yes for a lost key, but tell the landlord or agent and give them a key afterwards, because most tenancy agreements require the landlord to hold access. We provide an itemised invoice naming the lock and the date, which is what agents ask for, and we can cut an extra key on site for them at the same visit.
Will my insurance cover a lock change after lost keys?
Many home policies include lock replacement following lost or stolen keys, sometimes only where a crime reference number exists. We are not insurers and cannot promise what yours covers, so check the wording. What we can do is provide a dated, itemised invoice naming the parts fitted, which is what claims are usually held up for.
Should I report lost keys to the police?
If you believe they were stolen rather than mislaid, yes — a crime reference number is often what an insurer wants before paying for a lock change. If they were simply dropped somewhere, there is generally nothing to report, and the practical step is securing the door rather than filing anything.
What about the communal door to my building?
Raise it with the freeholder or managing agent, because a communal cylinder is not yours to change and other residents are affected. Meanwhile, your own flat door is the one that matters most and is entirely within your control. We can secure that today and give you something in writing to pass on about the shared entrance.
Can you get me in tonight if the lost set was my only key?
Yes. That is an emergency opening, and we work across the N and NW postcodes through the night. We open non-destructively wherever the lock allows it, which keeps the cost down and leaves the option of rekeying afterwards rather than being forced into buying a cylinder at two in the morning.
Can you make sure all my doors use the same new key?
Usually, and it is worth asking for while everything is open anyway. Keying alike means front, back and side doors all take one key, so there is less on the ring and less to lose next time. It needs compatible locks, which we can check on the visit before committing you to anything.
How is the price decided?
Per job, and quoted before we travel. Rekeying a cylinder, replacing one, and opening a door for someone with no keys at all are three different pieces of work at three different prices, and the hour of day matters too. Tell us what happened and what access you currently have, and you will have the figure up front.