Lost Your House Keys? Here's What to Do
If you've lost your house keys, focus on two things: can you still get into your home, and could someone find out which door those keys open?
Those answers help you decide whether you need a spare key, locksmith entry or a lock change. You don't automatically have to replace every lock.
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Lost house keys: the quick answer
If you're still able to get inside: check your spare keys and assess whether the missing set could be linked to your address. If someone might be able to use it to enter, consider changing the affected lock.
If you're locked out: contact someone authorised who has a spare, or arrange locksmith assistance. Regaining access doesn't prevent your missing key from working later.
What should you do first if you lose your house keys?
Before arranging work on the door, check whether the problem can be solved safely with a spare. Then think about where the keys went missing.
Retrace your steps
Check your pockets, bags, car and the last places you used the keys. Ask relevant shops, venues or transport operators about lost property.
Ask about a legitimate spare
A partner, housemate, landlord or trusted person may hold a working spare. That could solve the immediate access problem.
Check what was lost with them
A plain key is different from keys attached to an address label, wallet, bag or ID that may reveal where you live.
Decide whether the door is secure
Even if you have a spare, the lost key may still operate the existing lock. Consider the risk before treating the problem as solved.
If you post in a community group or contact local businesses, avoid identifying the exact home or door they unlock.
Lost your only house key and can't get in?
If the door is locked and nobody has a spare, you'll need to arrange authorised access. The method depends on the door and lock: a timber door with a night latch is different from a uPVC door with a euro cylinder and multipoint locking mechanism.
Tell the locksmith whether the keys are lost or stolen, whether the door is shut and locked, and what type of door you have. You may be asked to show that you're authorised to enter the property.
For more advice specifically about getting inside, see our locked out of house guide .
Access is the main problem
If the missing keys aren't likely to identify your home and the existing lock works, you may first need to regain entry and arrange a usable replacement key.
Access and security are both concerns
If the keys were stolen, lost near home or identifiable, the relevant lock may need changing as well as reopening the door.
Call Lock Luxe with your postcode and describe the door. For urgent assistance, use our emergency locksmith service . We'll discuss availability and relevant charges before booking.
Do you need to change the locks after losing your keys?
Not always. The decision depends on whether someone could use the keys to identify and access your property, as well as the type of lock installed.
Higher concern: keys lost close to home
Someone finding a key near your front door or on your street might be able to identify which property it opens. Replacing the affected lock is worth considering.
Higher concern: address or ID with the keys
A missing bag or wallet containing your keys and identifying details is a stronger reason to review the security of each affected door.
Higher concern: deliberate theft
If you believe someone has taken the keys intentionally, consider changing the locks they operate, even if you still have a spare set.
Potentially lower concern: anonymous key lost far away
A plain key lost far from home with no identifying details may pose a lower immediate risk. You'll still need to decide whether keeping the old lock is acceptable.
The original key may still open the door. When the relevant cylinder or lock is replaced, the old key will no longer operate that replacement.
Must the whole locking mechanism be replaced?
No. Many uPVC and composite doors have a euro cylinder connected to a larger multipoint mechanism. If the mechanism works and the concern is who holds a key, a correctly specified cylinder change may be enough. Other locks require a different solution.
For the full explanation of lock changes and suitable hardware, use our lock replacement service page .
What if you believe your house keys were stolen?
Prioritise securing the doors operated by those keys, especially if the theft included a wallet, identification or anything showing your address. A newly cut spare won't prevent the stolen key from working.
If the set opens multiple entrances, consider each affected lock. If it included a communal entrance fob or building key, contact the building manager or access-system administrator; they may need to disable or replace a credential.
Report suspected theft through the appropriate police channel. If someone is threatening you or attempting to enter the property, call 999.
Lost keys to a rented flat or house?
Contact your landlord, letting agent, housing association or property manager before changing the locks where practical. They may hold a spare, have an emergency access arrangement or require approval for replacement hardware.
If a replacement is authorised, check who needs copies of the new key. If you're currently locked out, explain that when you call; the access issue may need resolving before other arrangements.
Can you get a new house key without the original?
Sometimes. It depends on the lock and key system. Restricted or registered keys may require a security card, approved supplier or authorisation. In other cases, replacing the relevant cylinder or lock may be more practical.
There is an important difference: a replacement key gives you a way back in, while replacing the lock means the missing key will no longer operate it.
What type of lock is fitted?
You don't need to know the exact model before making an enquiry, but identifying the door can help:
- Euro cylinder: often fitted to uPVC and composite doors; sometimes the cylinder can be changed without replacing the multipoint mechanism.
- Mortice lock: commonly installed inside the edge of a timber door; any replacement needs to suit its existing fitting and security requirements.
- Night latch or rim cylinder: found on some timber front doors; the external cylinder may be replaceable separately.
If your door was already difficult to operate before you lost the key, mention that too. A separate mechanism or alignment problem may need assessment. See uPVC door and window lock help for that issue.
What happens when you contact Lock Luxe about missing keys?
I'm Hossein, the locksmith behind Lock Luxe. The first thing I need to understand is whether you're outside the property, what type of door you have and whether the missing keys might create a security risk.
That helps us discuss the appropriate next step instead of automatically recommending a complete lock replacement.
Explain the situation
Tell us your postcode, whether you have access and whether the keys were lost or stolen.
Identify the door
Let us know if it's timber, uPVC or composite. A clear photo of the hardware can help.
Discuss options and cost
We'll discuss access, security and the relevant fees so you can confirm charges before booking.
Send a photo, postcode and a short description on WhatsApp. You don't need to identify the lock's technical name.
How much does a locksmith cost if you've lost your house keys?
The existing Lock Luxe pricing information lists the following starting prices. Whether you need entry, a lock change or both will affect the amount quoted.
| Service | Listed price |
|---|---|
| Standard home lockout | From £89 |
| Standard cylinder / lock change | From £99 |
| Call-out / attendance | £49 |
| Out-of-hours / night work | From £149 |
The £49 attendance fee is listed separately from the starting service prices. Ask whether it's included in or added to your quote, what labour and parts are covered, whether VAT applies and how the out-of-hours rate is calculated.
For a broader explanation, see Lock Luxe locksmith prices . A simple lockout, a cylinder change and repair of a failed mechanism are different jobs.
Does home insurance cover lost house keys?
Some home insurance and home-emergency policies cover lost or stolen keys, emergency access or replacement locks; others do not. Check your policy before booking if you intend to claim, as the insurer may have conditions about the work or provider used.
Keep the invoice and other relevant paperwork in case you need to make a claim.
What Lock Luxe customers say
Feedback about Lock Luxe's general locksmith work. These reviews are not presented as lost-key-specific jobs.
“Helped me when I was locked out. Came quickly, fixed the job for a reasonable price. Highly recommend.”Josie Google review
“They responded quickly, arrived fully prepared, and handled the situation calmly and professionally.”Gerardo Ramsdell Google review
“The technician arrived on time, assessed the situation carefully and resolved my lock issue efficiently.”Mason Clark Google review
How can you avoid losing your house keys again?
Once access and security are sorted, a few habits can make future problems less likely:
- Leave a spare with someone you genuinely trust, where appropriate.
- Avoid obvious outdoor hiding places such as mats and flowerpots.
- Don't put your address or identifying details on a keyring.
- Consider a key tracker and check that any spare key is in good condition.
Lost house key assistance around Hendon and North London
Lock Luxe is based in Hendon and focuses on nearby parts of North and North West London, generally within approximately five miles of Hendon. This includes enquiries from Golders Green, Colindale, Finchley, Brent Cross, Cricklewood and Mill Hill, subject to availability.
Send your postcode to confirm coverage. You can also check our service areas.
Lost house keys FAQs
I've lost my only house key. Can a locksmith help?
Yes. A locksmith can assess the door and lock and discuss authorised entry. Whether the lock also needs replacing depends on the security risk and its condition.
If I find my old key after the lock is changed, will it work?
No, not in a properly replaced cylinder or lock supplied with a different set of keys. The old key will normally no longer operate that replacement.
Can a locksmith make a key without the original?
Sometimes, depending on the lock and key system. Restricted keys may need approved authorisation. Changing the cylinder or lock may be more suitable if the missing key poses a security risk.
What if I lost my communal entrance fob too?
Contact the building manager or whoever controls access. The fob may need deactivating or replacing separately from the lock on your individual front door.
Can Lock Luxe help at night?
Lock Luxe advertises 24/7 emergency enquiries. Call with your postcode to confirm availability and ask about the full out-of-hours price before booking.
Will I need to prove I live at the address?
You may be asked for identification or other evidence that you're authorised to enter. Explain if your documents are inside the property so the locksmith can advise on suitable verification.