Key Takeaways
Change your locks immediately after moving into a new house, losing your keys, or experiencing a break-in attempt.
Replace door locks every 7 years, or sooner if they exhibit signs of wear or damage.
Upgrade to anti-snap cylinders if you have standard euro cylinder locks on uPVC doors.
Budget £80-£300 for professional lock changes, depending on lock type, time of the day and security level
Always verify your insurance requirements before changing locks to ensure coverage remains valid.
As a professional locksmith with years of experience helping homeowners secure their properties, I frequently encounter people asking when they should change their locks. It's a question that doesn't have a simple answer because several factors influence the timing. Your home security depends on more than just having locks - it requires having the right locks that work correctly and haven't been compromised.
The decision to change the locks on your house involves balancing security concerns, practical considerations, and cost factors. Whether you're moving into a new home, concerned about worn door locks, or looking to upgrade your security system, understanding when lock replacement becomes necessary can provide peace of mind and enhanced protection for your property.
Immediate Situations Requiring Lock Changes
Certain situations demand immediate action when it comes to changing your locks. These scenarios present explicit security threats that compromise your home's safety, making prompt lock replacement not just advisable but essential.
Moving into a new home represents the most common scenario where I advise immediate lock changes. Even when previous homeowners seem trustworthy, it's impossible to track every key copy that may exist. Estate agents, contractors, cleaners, and even neighbours might still have access to your new house. Previous owners often forget about spare keys they've given out over the years, and these can easily end up in the wrong hands.
When you're moving into a new house, I recommend changing all external door locks before you fully settle in. This includes your front door, back door, and any side entrances.
Lost keys or stolen house keys create immediate security vulnerabilities. Even if you believe the lost keys are somewhere harmless, there's no guarantee they won't be found and used maliciously. I've seen cases where lost keys surface months later, often in the possession of people with questionable intentions.
When keys go missing, the priority should be changing your locks as quickly as possible. A professional locksmith can typically complete this work within a few hours, restoring your security and eliminating the risk posed by those missing keys.
Break-ins or attempted break-ins absolutely require immediate replacement of the locks. Successful burglaries often involve lock damage that isn't immediately visible, and intruders may have obtained access methods during their attempt. Even failed break-ins can compromise your door lock mechanisms, making them easier targets for future attempts.
After any forced entry or attempted break-in, I always recommend a complete security assessment along with lock replacement. The stress and violation felt after such incidents make this security measure both practically and psychologically necessary for peace of mind.
Relationship changes, such as separation, divorce, or ending cohabitation arrangements, create situations where former partners or housemates may retain access to your property. These sensitive situations require careful handling, and changing the locks eliminates potential conflicts while ensuring only you control access to your home.
Similarly, when dismissing household staff, ending tenancy agreements, or severing relationships with anyone who previously had legitimate access, immediate lock changes protect against unauthorised entry and potential security threats.
Regular Maintenance Timeline
Beyond immediate security concerns, door locks require regular maintenance and eventual replacement as part of responsible home ownership. Understanding when normal wear necessitates lock changes helps maintain consistent security standards.
The seven-year rule serves as a general guideline for lock replacement in most residential settings. This timeframe accounts for everyday wear and tear under typical usage conditions. However, several factors can shorten this timeline, particularly in high-traffic areas or properties exposed to harsh weather conditions.
High-quality mortice locks and euro cylinder locks can last longer than seven years with proper maintenance, whereas cheaper standard lock options may require earlier replacement. The key factor isn't just age, but functionality - any door lock that shows signs of failure should be replaced, regardless of how long it has been installed.
Signs indicating an earlier replacement include difficulty turning the keys, loose mechanisms, visible wear on the cylinder, or keys that frequently stick. These symptoms suggest internal components are wearing out, potentially compromising security effectiveness. When lubricant and minor adjustments fail to resolve these issues, replacement becomes necessary.
Weather damage particularly affects external door locks. Corrosion, rust, or freeze damage can severely impact lock performance and security. Regular seasonal inspections help identify these problems before they become security vulnerabilities.
Technology updates also drive replacement decisions. Older lock technology may no longer meet current security standards or insurance requirements. Smart locks, anti-snap locks, and other modern security features offer enhanced protection that makes upgrading worthwhile, even when existing locks still function properly.
Security Upgrade Scenarios
Security threats evolve constantly, and lock technology advances to meet these challenges. Understanding when to upgrade your locks for enhanced security helps protect against modern threats while potentially reducing insurance premiums.
Lock snapping attacks have become increasingly common, particularly targeting properties with standard euro cylinder locks. These attacks allow intruders to break cylinders and gain entry within seconds. If your uPVC doors still have basic euro cylinders, upgrading to anti-snap locks should be a top priority.
Anti-snap cylinders feature reinforced designs that prevent this specific attack method. The upgrade cost typically ranges from £80 to £300 per lock when installed by a professional locksmith, representing good value for the enhanced security provided.
British Standard BS3621 compliance is often necessary for insurance coverage. Many insurance policies require locks meeting this standard, particularly for front door installations. If your current locks don't meet the BS3621 requirements, upgrading ensures continued insurance coverage while providing superior security.
These high-security locks undergo rigorous testing and meet strict performance criteria. The investment in BS3621-compliant locks often pays for itself through insurance discounts and the enhanced protection they provide.
Smart locks offer convenience and monitoring capabilities that traditional mechanical locks cannot match. Modern smart lock systems enable remote access control, provide temporary codes for service providers, and maintain detailed access logs. However, they also introduce potential cybersecurity vulnerabilities that require careful consideration.
When considering smart locks, evaluate your technical comfort level and cybersecurity awareness. These systems are most effective for users who understand their capabilities and limitations. Professional installation ensures proper setup and helps maximise security benefits while minimising potential risks. Generally, I don't recommend smart locks. They have more points of failure than a standard lock, and when they fail, they are much harder to gain access to non-destructively.
Coordinating multiple locks to work with a single key system improves convenience while maintaining security. If you currently juggle various keys for different doors and windows, a professional locksmith can rekey your existing locks or install new locks that share the same key.
This approach reduces the risk of lost keys while ensuring consistent security levels across all entry points. The coordination process with all key holders typically costs less than full replacement when existing locks remain in good condition.
Property-Specific Considerations
Different property types present unique challenges and requirements when it comes to determining the optimal timing for lock replacement. Understanding these property-specific factors helps determine the most appropriate approach for your situation.
New Build Properties
New-build properties require lock changes, despite being "new", due to the extensive access granted during construction. Site workers, tradespeople, supervisors, and various contractors all receive keys during the building process. These temporary arrangements often leave multiple key copies in circulation, so considering a key safe installation for controlled access and improved security can be a worthwhile solution.
Builders typically use basic, standard lock hardware to minimise costs, which may not provide optimal security for long-term residence. Upgrading to higher-quality locks upon purchase ensures better protection and eliminates concerns about untracked key access.
I recommend treating new build properties the same as any house purchase - change all locks before moving in. The peace of mind gained far outweighs the cost, especially considering the uncertainty about who might still have access to it.
Older Properties
Older properties often feature outdated lock technology that no longer meets modern security standards. Mortice lock designs from decades past may lack features now considered essential for adequate protection. Additionally, wear and tear over many years can compromise even high-quality locks.
Insurance requirements often drive the need for lock upgrades in older properties. Policies may specify minimum security standards that older locks cannot meet. Checking your insurance requirements before purchasing or renovating older properties helps avoid coverage issues.
The condition of doors themselves also affects lock security in older properties. A wooden door in poor condition may not provide proper support for even excellent locks. Sometimes, door replacement or reinforcement becomes necessary, along with lock upgrades, to achieve adequate security levels.
Cost and Planning Considerations
Understanding the financial aspects of lock changes helps property owners budget appropriately and make informed decisions about timing and the scope of work.
The budget breakdown varies significantly based on the lock type and security level. Fundamental cylinder changes typically cost £80-£100 per lock, while anti-snap locks range from £80 to £150. High-security locks meeting BS3621 standards can cost £150-£300 per lock when professionally installed.
Emergency locksmith services command premium pricing, often double or triple standard rates. Planning lock changes during regular business hours saves substantial money compared to emergency call-outs. However, immediate security concerns may justify the additional cost.
Replacement versus rekeying presents different cost structures. Rekeying existing locks costs less than full replacement but only works when locks remain in good condition and meet current security requirements. Complete replacement provides opportunities to upgrade security levels and ensure optimal protection.
Multiple quotes from certified locksmiths help ensure fair pricing and quality work. Look for locksmiths with proper credentials and insurance coverage. The cheapest option isn't always the best value, particularly for security-critical applications.
Insurance considerations can offset lock upgrade costs through reduced premiums. Many insurers offer discounts for properties with high-security locks that meet recognised standards. Check with your insurance provider to determine potential savings before selecting lock specifications.
Some insurance policies require specific types of locks or standards. Failing to meet these requirements can void coverage, making compliance essential rather than optional. Document any lock changes with photos and receipts to support insurance claims if needed.
Preventive Measures
Proper lock management and maintenance extend the life of locks while maintaining their security effectiveness. These preventive approaches reduce the frequency of lock changes while ensuring consistent protection.
Key management practices have a significant impact on lock security and longevity. Limiting the number of spare keys in circulation reduces the likelihood of unauthorised access. When spare keys become necessary, track their distribution carefully and retrieve them promptly when no longer needed.
Avoid hiding keys in prominent locations around your property. Fake rocks, plant pots, and door frames are among the first places intruders typically check. If you must leave keys for legitimate access, consider lockbox systems that provide controlled access without compromising security.
Regular maintenance keeps locks functioning properly and extends their useful life. Monthly lubrication with appropriate products prevents internal wear and ensures smooth operation. Check for loose screws, alignment issues, or other problems during routine maintenance.
Seasonal inspections help identify weather-related damage before it affects security. Look for signs of corrosion, rust, or freeze damage, particularly on external doors and windows. Address minor issues promptly to prevent them from becoming significant security vulnerabilities.
Complementary security measures reduce reliance on locks alone while providing enhanced protection. Security cameras, alarm systems, and motion-activated lighting create multiple defensive layers that deter intruders and provide evidence in the event of break-ins.
Window locks often receive less attention than door locks, but represent significant security vulnerabilities. Ensure all accessible windows have functioning locks that meet your security requirements. Ground-floor and easily accessible upper-floor windows require particular attention.
Professional security assessments provide expert evaluation of your property's vulnerabilities and help prioritise security improvements. These assessments often reveal issues that aren't obvious to property owners and suggest cost-effective enhancements.
During assessments, I examine all entry points, evaluate existing locks and security measures, and recommend improvements based on current threat levels and property-specific factors. This comprehensive approach ensures security investments provide maximum benefit.
Maintaining home security requires understanding when circumstances demand lock changes and planning for regular maintenance. Whether responding to immediate threats or upgrading for enhanced protection, professional guidance ensures that you receive appropriate solutions tailored to your specific situation. Investing in proper locks and timely replacements provides peace of mind and protects what matters most: your family and property.
Remember that lock changes represent just one component of a comprehensive home security system. When combined with proper key management, regular maintenance, and complementary security measures, quality locks provide a solid foundation for adequate property protection. When in doubt about timing or lock selection, consulting with a professional locksmith ensures decisions based on current security standards and your specific requirements.
Published: 1st September, 2025 | Updated: 4th September, 2025