British Standard Locks. Fixed Price. Same Day Available.
When Do You Need to Change or Replace Your Locks?
People call LockFirst to change or replace locks for all kinds of reasons. Here are the most common situations we see across London every week and why each one genuinely warrants a lock change rather than waiting:
Previous owners, former tenants, estate agents, builders and contractors may all have copies of your keys. Statistically, you are more likely to be burgled in the first 12 months of moving house than at any other time. Changing the locks on day one removes that risk entirely.
If you cannot account for where your keys are, you cannot know who might have them. A cylinder replacement costs a fraction of what a burglary costs financially and emotionally. We change locks across London same day for exactly this situation.
A forced or compromised lock must be replaced, not just repaired. We attend burglary repairs across North West London on the same day and fit anti-snap, high-security replacements to prevent a repeat.
Landlords and letting agents across London should change locks between every tenancy. You cannot verify how many key copies exist or where they are. LockFirst provides fast, reliable lock changes for landlords across all London postcodes.
A lock that has progressively failed, a cylinder that spins freely, or a mechanism that can no longer be relied upon all need replacing. We assess honestly and replace only what is genuinely necessary.
Many home insurance policies specify a minimum lock standard. If your current locks do not meet BS3621 or TS007 3-star requirements, you may be underinsured without knowing it. We check and advise on every visit.
Do You Need a Full Lock Replacement or Just a New Cylinder?
This is a question most locksmiths do not explain properly and it costs customers money they do not need to spend. Here is the honest answer:
Most modern doors have two separate components: the lock body (the mechanism built into the door) and the cylinder (the part the key goes into). In many cases when a lock needs replacing, only the cylinder needs to be swapped not the entire lock body. A cylinder replacement takes around 15 minutes, costs significantly less than a full lock replacement and leaves the door operating exactly as before with a new set of keys.
Cylinder-only replacement is usually right when:
Full lock replacement is necessary when:
On every job across London, LockFirst assesses which of these applies before recommending anything. If a cylinder swap is all you need, that is what we will do and we will tell you so rather than fitting a full replacement you do not need.
Lock Replacement by Door Type Across London
London properties have a wide range of door types. Here is what LockFirst recommends for each one — and what we carry on every van to complete the job first time:
Door Type
What We Replace
Who Has a Copy of Your Key Right Now?
This is a question most homeowners across London have never seriously asked but it is one of the most important security questions you can answer.
Over the lifetime of a property, keys are cut and distributed more widely than most people realise. By the time you move into a house in Golders Green or Primrose Hill, it is entirely possible that the following people have had a copy at some point:
You cannot get those keys back. The only way to guarantee that you and only you control access to your property is to change the locks.
LockFirst provides same-day lock changes across North West London. One call, one visit, complete peace of mind.
Lock Changes for Landlords and Letting Agents Across London
LockFirst carries out lock changes for landlords, letting agents, housing associations and property management companies across North West London every week. We understand the pressures of property turnover and the importance of fast, reliable service between tenancies.
If you manage multiple properties across London and need a reliable locksmith partner you can call for both emergencies and planned work, LockFirst provides exactly that. Call us to discuss how we can support your portfolio.
What to Expect When LockFirst Changes Your Locks
Every lock change we carry out across London follows the same professional process:
Tell us your door type, your current lock type if you know it, and why you need the change. We identify the right cylinder or lock for your door and insurance requirements immediately on the call.
You get a clear, fixed price covering parts and labour before we leave. No call-out fee. No hidden charges. You know exactly what you are paying before anyone arrives.
For urgent lock changes we aim to reach you within 30 to 45 minutes across London. For planned visits we agree a time that suits you and arrive on time.
On arrival we check the door, confirm the right lock type and discuss whether a cylinder swap or full replacement is the appropriate solution. We never start work without your agreement.
The new lock is fitted, aligned and tested before we leave. We confirm it meets the required insurance standard, provide your new keys and leave the door operating smoothly and securely.
Recent Lock Replacement Jobs We Have Completed Across London
A family moving into a property in Hampstead called us on the morning of completion day. We changed all four exterior door cylinders to Ultion TS007 3-star anti-snap units before the removal van arrived. All new keys cut and provided on the same visit.
A landlord managing three properties in Golders Green needed lock changes at two of them before new tenants moved in the following morning. We completed both jobs the same afternoon — standard ERA cylinders replaced with anti-snap upgrades, invoiced clearly for the property management account.
A resident in Belsize Park lost her handbag containing her house keys and was unsure whether they had been taken or simply lost. We attended within 35 minutes, replaced the front and back door cylinders with Yale anti-snap units and had new keys cut on the spot. She was back in control of her security within the hour.
A homeowner in Swiss Cottage was told by his insurer at renewal that his front door lock did not meet BS3621 standard. We visited the same week, replaced the standard five-lever mortice on the Victorian front door with a BS3621 Chubb unit and confirmed the lock grade in writing for his insurer.
We attended a burglary repair in Primrose Hill where the front door euro cylinder had been snapped. We replaced the damaged cylinder with a Ultion Sold Secure Diamond unit and fitted a door guard plate to reinforce the cylinder against future attacks. Same-evening visit, property secured before midnight.
A letting agent needed six lock changes across four properties before the end of the month. We scheduled and completed all six changes across Cricklewood, Golders Green and Primrose Hill over two days, invoiced per property and provided cylinder specification sheets for each address.
Not sure if we reach your street? Call us on 07468305302 and we will tell you straight away.
Lock Replacement and Lock Change Pricing in London
Lock replacement pricing in London varies depending on the lock type, the door type and the security standard required. At LockFirst, you always know the full cost before we start parts, labour and everything else included in one fixed price.
When you call, we will discuss your door type, the number of locks you need changing and the security standard required by your insurer. We will then give you a clear, fixed, all-inclusive price. No call-out fee. No VAT added on arrival. No upcharges for parts.
Yes. Previous owners, tenants, estate agents and tradespeople may all have key copies. A cylinder change across all exterior doors takes under an hour and gives you complete control from day one.
Looking for a related service? These pages cover the full range of lock and security work LockFirst carries out across London:
