Changing the Locks When You Move into a New Home

When a property changes hands, the conveyancing process transfers legal ownership but it cannot transfer certainty about who holds a key. Estate agents often hold keys during the marketing period; solicitors sometimes do too. Tradespeople who worked on the property before the sale may still have copies. Even the most conscientious vendor cannot be certain every spare key has been returned. For a family moving into a semi-detached on Arbury Road or a first-time buyer taking on a Victorian terrace near Mill Road, that uncertainty is a real and unnecessary risk. A lock change eliminates it entirely and replaces it with a clean slate: you know exactly who has access to your home because you are the first person to have held the new keys.

There is also a practical insurance angle. Many home contents insurers ask whether your front door locks meet British Standard BS3621. If the existing locks are old, worn, or non-compliant, you may not be covered for a break-in claim even if the door was locked at the time. Fitting new, BS3621-approved hardware at the outset means you start your policy on solid ground rather than discovering a gap after something goes wrong.

The majority of homes built or refurbished in Cambridge from the 1990s onwards have uPVC or composite front doors. These use a multipoint locking system operated by a long handle mechanism, secured by a euro cylinder — the oval-shaped barrel you insert your key into. Euro cylinders are quick to replace: a skilled locksmith removes two screws, slides the old cylinder out, and fits the new one in a matter of minutes. The lock body itself does not need to be touched.

What matters enormously with euro cylinders is the security grade of the replacement you choose. Standard cylinders are vulnerable to a technique called cylinder snapping, in which the exposed portion of the barrel is broken off using simple leverage, allowing the lock to be opened without a key. Anti-snap cylinders are designed to sacrifice the exposed section while keeping the internal mechanism intact. For the best protection, look for a TS007 3-star rated cylinder — either a single 3-star cylinder, or a combination of a 1-star cylinder with a 2-star door handle. Your locksmith can advise which configuration suits your specific door furniture. This is particularly worth noting for uPVC door lock repair Cambridge residents sometimes call about: what looks like a lock fault can occasionally be damage caused by an attempted snap attack, so having the cylinder inspected when you move in is a worthwhile step regardless.

Older Cambridge properties — the red-brick terraces around Romsey, the Edwardian semis in Chesterton, the period conversions closer to the city centre — are far more likely to have timber front doors. These typically carry two locks: a Yale-type nightlatch near the top of the door, and a 5-lever mortice deadlock set into the door itself roughly a third of the way up. Both should be changed when you move in, and they involve different processes.

Replacing a nightlatch means removing the existing cylinder and fitting a new one with fresh keys — straightforward, and the backplate usually stays in place. Replacing a mortice deadlock is more involved: the locksmith chisels out the old lock body from the door edge, fits the new one, and aligns the keep on the door frame. If the existing lock is a 2-lever or 3-lever type, this is a good moment to upgrade to a 5-lever BS3621 deadlock, which meets the standard most insurers require. How to install a mortice lock in a new door is not a DIY job for most homeowners — the tolerances are tight, the mortice pocket needs to be exactly the right size, and a poorly fitted lock offers little real security even if the hardware itself is good quality. Having a professional handle it means the lock is fitted correctly and the door operates smoothly from day one.

A note on back doors and side gates into the garden: patio and French doors — common on Cambridge new-builds and renovations — also use euro cylinders and benefit from the same anti-snap upgrade. If your property has a rear uPVC door, include it in the same visit to avoid a second call-out.

A typical lock change visit follows a predictable pattern. The locksmith will inspect the existing hardware, confirm the door and frame measurements, discuss the security options with you, and give you an exact, confirmed price before any work begins. Factors that affect the final quote include the type of lock and cylinder being fitted, the number of doors covered, the time of day — evenings, weekends, and bank holidays carry a different rate — and travel distance. Once you agree the price, the work itself is usually done within 45 minutes to an hour for a standard two-lock timber door or a uPVC cylinder swap.

Occasionally the conversation about lock changes comes up not on moving-in day but after something has gone wrong — a lost key, a suspected copy in the wrong hands, or a break-in attempt. If you are locked out and need urgent help, the process is similar: ownership verification first (ID and proof of address are standard), then the locksmith will gain entry by the least destructive method available before advising on replacement hardware. If you are ever unsure what to do when you are locked out of your house, the safest answer is straightforward: check whether any other door or ground-floor window has been left on the latch, ask a neighbour whether they hold a spare key, and if neither applies, call a professional. Do not attempt to force entry yourself — it risks damaging the door, the frame, and potentially your insurance position. For a 24 hour locksmith Cambridge residents can rely on any time of day or night, call Chesterton Locksmith on 01223 912859 and we will send someone straight out, usually reaching you within around 30 minutes.

Beyond the immediate cylinder or lock body swap, moving in is a sensible time to think about the broader security picture. If you have moved into a flat, bear in mind that your security depends on two doors: your own front door and the communal entrance. If the communal door locks seem worn or the entry system is unreliable, speak to your managing agent or housing association — it is their responsibility to maintain those, and a locksmith can provide a written assessment to support your request.

Landlords and letting agents in Cambridgeshire are increasingly asked by tenants to confirm that locks have been changed between tenancies. If you are renting and your landlord has not arranged this, you have every right to ask — and in many cases the agent can instruct a locksmith directly. It is also worth photographing your existing locks before any work begins, noting the brand and grade, and keeping your new key receipts somewhere safe. This documentation is useful both for insurance purposes and in the unlikely event you ever need to call a locksmith out again and need to describe the hardware quickly. When you are ready to book, or simply want to ask a question about what lock suits your door, call 01223 912859 — we answer 24/7, including evenings, weekends, and bank holidays.

Chesterton Locksmith is a fully insured, mobile locksmith service operating across Cambridge and the surrounding villages. Our trained locksmiths cover a wide range of residential and light commercial work, including: euro cylinder replacement on uPVC and composite doors; anti-snap and TS007 3-star cylinder upgrades; 5-lever mortice deadlock supply and fitting; Yale nightlatch replacement; multipoint lock mechanism repair and replacement; door lock replacement Cambridge wide, including period timber doors; uPVC door lock repair Cambridge properties where the handle or gearbox has failed; emergency lockout response with ownership verification; non-destructive entry techniques to minimise damage to the door and frame; lock change Cambridge following a lost key or suspected key compromise; re-securing a door after a break-in; fitting additional bolts to French doors and patio doors; door alignment and adjustment where a misaligned frame causes lock problems; hinge bolt fitting to reinforce vulnerable timber door hinges; BS3621 compliance checks and upgrades for insurance purposes; door furniture assessment and advice; sash window lock fitting; communal entrance lock assessment for flats and blocks; security survey and written report for landlords and letting agents; lock change between tenancies for rental properties; emergency locksmith Cambridge response for locked-out residents at any hour; 24 hour locksmith Cambridge call-outs including weekends and bank holidays; lock upgrade consultation when renewing a home insurance policy; fitting door chains and door limiters; security audit following a neighbourhood incident or attempted break-in; and advice on masterkey systems for landlords managing multiple properties. If your requirement is not listed here, call us and we will tell you honestly whether it is something we can help with.

Lockouts and security emergencies do not observe office hours. A key broken in the lock at 11pm, a door that will not close properly after a failed break-in attempt on a Sunday morning, a tenant locked out of a Cambridge city-centre flat on a bank holiday — these are all situations where waiting until Monday morning is simply not an option. Chesterton Locksmith operates around the clock, every day of the year. When you call 01223 912859 out of hours, you reach a real person, not an answering service. We confirm your location, describe the job, give you an upfront price that accounts for the time of call, and despatch a locksmith immediately. We are typically with you in around 30 minutes, though travel time varies depending on where you are in the Cambridge area.

For landlords managing several Cambridge rental properties, or owners of a house converted into multiple flats, a masterkey system can simplify access considerably. The system allows individual tenants to have a key that opens only their own front door, while the landlord or managing agent holds a single master key that opens all doors in the system. Each lock is individually keyed, so a tenant leaving and taking their key with them does not compromise the security of other flats — only that one cylinder needs changing. Our experienced locksmiths can design and fit a system to suit the number of units involved, and can extend it over time as a portfolio grows. Call 01223 912859 to discuss your requirements and we will explain the options clearly before any commitment is made.

We share practical security tips, before-and-after lock jobs, and a behind-the-scenes look at the work we do across Cambridge on our Instagram page. It is a good place to see the kinds of doors and locks we deal with day to day, get a sense of the hardware options available, and ask us informal questions. Search for Chesterton Locksmith and follow along — we would be glad to have you there.