What You Need to Know Before Changing Door Locks
- Team Roni
- May 27
- 4 min read

Why Change Your Door Locks?
Moving house brings excitement and a fresh start. However, security concerns often arise when previous owners kept spare keys. Furthermore, old locks might fail unexpectedly, leaving you stranded outside. Additionally, worn mechanisms compromise your home's protection against intruders.
Modern locks offer enhanced security features that older models lack. Subsequently, upgrading provides peace of mind and better protection. Moreover, new locks often come with warranties and improved durability.
Essential Tools and Materials
Before starting, gather the necessary equipment for the job. Firstly, you'll need a screwdriver set with various head types. Secondly, a measuring tape ensures proper lock sizing. Additionally, pencils help mark drilling points accurately.
Most importantly, purchase quality replacement locks from reputable suppliers. Furthermore, consider whether you need matching keys for multiple doors. Also, replacement screws might be necessary if originals are damaged.
Measuring Your Current Lock
Accurate measurements prevent costly mistakes and return trips. Start by measuring the door thickness using your tape measure. Next, check the backset distance from the door edge to the centre. This measurement typically ranges from 60mm to 70mm.
Also, measure the existing hole diameter for proper lock fitment. Additionally, note the lock's overall dimensions, including height and width. Write down these measurements before shopping for replacements.
Choosing the Right Lock Type
Different lock types suit various security needs and budgets. Cylinder locks offer good security for most residential applications. Alternatively, mortice locks provide superior protection but require professional installation.
Smart locks bring modern convenience with keyless entry options. However, they require batteries and technical knowledge for setup. Therefore, consider your technical abilities before choosing electronic options.

Step-by-Step Installation Process
Removing the Old Lock
Start by opening the door fully for easy access. Then, remove screws from the interior lock mechanism carefully. Next, pull out the lock cylinder from the door's exterior side.
Clean the lock housing thoroughly before installing the new mechanism. Also, check for any damage that might affect installation. Additionally, save original screws if they're in good condition.
Installing the New Lock
Insert the new cylinder into the prepared hole first. Then, align the mechanism properly with the door edges. Next, secure interior components with provided screws tightly.
Test the lock operation before completing the installation fully. Also, ensure keys turn smoothly in both directions. Finally, adjust strike plate positioning if necessary.
Common Installation Challenges
Door alignment issues frequently complicate lock installation processes. Moreover, old screw holes might be too large for new hardware. Additionally, paint buildup can interfere with proper lock seating.
Drilling mistakes often occur when homeowners rush through measurements. Furthermore, incorrect backset distances cause operational problems later. Therefore, double-check all measurements before making permanent modifications.
When to Call Professional Locksmith Services
Complex installations often require professional locksmith expertise and specialised tools. Similarly, security upgrades for commercial properties need expert assessment. Additionally, emergency situations demand immediate professional intervention.
Professional locksmiths possess proper tools and extensive experience with various lock types. Moreover, they can recommend suitable security solutions for your specific needs. Furthermore, professional installation typically includes warranties and ongoing support.
Emergency locksmiths provide 24-hour assistance when lock failures occur unexpectedly. These situations often happen during evenings or weekends when DIY help isn't available. Additionally, professional key-cutting services ensure proper key duplication and replacement.
Security Considerations
New locks dramatically improve your home's overall security profile. However, installation quality directly affects their effectiveness against break-in attempts. Therefore, proper installation becomes crucial for maximum protection.
Consider upgrading to British Standard locks for enhanced security ratings. These locks meet rigorous testing standards and provide superior burglar resistance. Additionally, insurance companies often offer discounts for approved lock installations.
Maintenance and Aftercare
Regular maintenance extends lock lifespan and ensures reliable operation. Monthly lubrication with graphite spray prevents mechanism seizures. Additionally, check screw tightness periodically to prevent loosening.
Weather protection becomes important for external locks exposed to the elements. Moreover, avoid forcing keys or handles when the operation becomes stiff. Instead, address problems early before complete failure occurs.
Clean lock surfaces regularly to prevent dirt accumulation from affecting operation. Also, replace batteries promptly in electronic locks to avoid lockouts. Furthermore, keep spare keys in secure locations for emergency access.
Cost Considerations
Basic cylinder locks typically cost between £20 to £50 for standard residential applications. However, high-security options range from £80 to £200, depending on features. Additionally, professional installation adds £50 to £100 to the total costs.
Budget for potential complications like door modifications or hardware replacement. Moreover, consider long-term value when choosing between basic and premium options. Quality locks often provide better durability and security over time.
Conclusion
Changing door locks requires careful planning, proper tools, and attention to detail. While DIY installation saves money, complex situations benefit from professional expertise. Therefore, assess your skills honestly before starting any lock replacement project.
Success depends on accurate measurements, quality materials, and proper installation techniques. Additionally, regular maintenance ensures long-term reliability and security. Most importantly, prioritise safety and don't hesitate seeking professional help when needed.
For those requiring professional assistance or quality lock supplies, Sam's Ironmongery has served customers throughout the region for decades. Their experienced team provides comprehensive locksmith services, emergency support, and expert key cutting solutions. Whether you need standard residential locks or specialised security systems, their knowledgeable staff can guide you towards the perfect solution for your specific requirements.
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