01
Emergency Lockout Service
Locked out of your house, flat or shop? Cosmo Locksmith opens the door fast and without damage, 24 hours a day — usually within 30 minutes.
From £59
Est. family-run · London & the Home Counties
A proper locksmith, the proper way.
Cosmo is a family-run locksmith covering London's suburbs and the Surrey, Kent and Hertfordshire borders. Straight prices, tidy work, and an engineer who turns up when he says he will.
4.9 on Google · 187 reviews Usually 20–40 min No call-out fee DBS-checked
From £59
Lockouts · no call-out fee
DBS-checked engineers No call-out fee Non-destructive entry British Standard locks Fixed price up front 12-month guarantee
Request a locksmith
Name, number, address — an engineer rings you back within minutes.
Three details. We ring you straight back.
Name, number, address. A local engineer rings to confirm and tell you when he's on his way.
- 1Contact
- 2Address
Lockouts
from £59
Lock changes
from £75
Call-out fee
none, ever
What we do
Lockouts, lock changes, break-in repairs. Everything except car keys.
Read more
02
Lock Change & Replacement
New tenancy, lost keys or a worn-out lock — Cosmo Locksmith supplies and fits British Standard locks on the spot, keyed-alike if you want one key for every door.
From £75
03
Burglary Repair & Boarding Up
Forced door or broken frame after a break-in? Cosmo Locksmith boards up, repairs the damage and fits new locks the same day, with a written report for your insurer.
04
uPVC & Composite Door Lock Repair
Stiff handle, door won't lock, or the mechanism's given up? Cosmo Locksmith repairs and replaces uPVC multipoint locks and realigns the door so it locks smoothly again.
05
Moving House Lock Change
You don't know who still has keys to your new place. Cosmo Locksmith changes every external lock in one visit — often the day you complete — all keyed alike.
06
Commercial & Security Upgrades
Shops, offices, HMOs and landlords: master-key systems, high-security cylinders, smart locks and a free security survey with every visit from Cosmo Locksmith.
How it works
Call, we ring back, sorted.
- 1Ring or fill the form
Tell us what's happened and roughly where you are. We give you a fixed price and an honest arrival time.
- 2Engineer rings you back
A local DBS-checked engineer calls within minutes to confirm and tells you when he's on his way.
- 3Sorted, guaranteed
Door opened without damage or new British Standard lock fitted. Price as agreed, receipt and 12-month guarantee.
0 min
Average arrival
0%
Opened without damage
0 mo
Guarantee
0/7
Always open
Reviews
What our customers say
“Snapped the key in the lock on a Sunday morning. Out within the hour, key extracted, new cylinder fitted, and the chap even oiled the hinges while he was at it.”
Eleanor W. · Richmond · Snapped key · 5 days ago
“We'd just bought the house and wanted every lock changed. One visit, keyed alike, and a proper explanation of what BS3621 actually means for the insurance. Very reassuring.”
Graham T. · Epsom · Moving house · 2 weeks ago
“Honest to a fault — told me the lock could be repaired rather than replaced and charged accordingly. Rare these days.”
Nadia K. · Sutton · Lock repair · 3 weeks ago
Areas we cover
Local engineers in 10 towns
We don't do car keys. Cosmo Locksmith is a home and business locksmith. For vehicle lockouts or key programming you'll want an auto locksmith.
FAQ
Questions people ask us
How quickly can you get a locksmith to me?+
For a lockout we aim to be with you within 20 to 40 minutes anywhere we cover. You get an honest arrival time on the phone and the engineer rings when he's close.
Do you charge a call-out fee?+
No. You pay for the work, not for us turning up. Lockouts start from £59 and lock changes from £75; the engineer confirms the exact fixed price before he sets off.
Will you damage my door to get in?+
Almost never. Our engineers open the vast majority of locks non-destructively. If a lock does have to be drilled we tell you first and fit a new one straight away.
Are your locks insurance approved?+
Yes. We fit BS3621 mortice locks and TS007 anti-snap cylinders and give you a dated receipt showing the grade.
Do you do car keys?+
No. We're a home and business locksmith and don't cut or programme vehicle keys.
Which areas do you cover?+
London and the Home Counties — see the full list of towns on our areas page. Each has a local number and a local engineer.
Locked out? Ring now — we're on our way.
Honest prices · Tidy work · Engineers who turn up