Lock Replacement | MLA Approved Local Locksmiths

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When it comes to professional lock replacement, trust the experts at Active Lock Centre your MLA-approved locksmiths serving Welwyn Garden City, Hatfield, St Albans, Stevenage, and Hertford.
With over 40 years of experience, our family-run locksmith business provides reliable, insured, and friendly service with no call-out fee. Whether you’ve suffered a break-in, moved home, or simply need to upgrade your old locks, we’re available 24/7 to help you secure your property.

Lock replacement service in Welwyn Garden City Active Lock Centre engineer fitting a new lock

Professional Lock Replacement Services Near You

At Active Lock Centre, we specialise in lock replacement for all types of doors and properties. From uPVC door lock changes to high-security cylinder upgrades, our team delivers a fast, professional, and non-destructive service day or night.

As proud members of the Master Locksmiths Association, we uphold the highest standards of workmanship and customer care.

✅ MLA Approved
✅ No Call-Out Fee
✅ 40 Years Experience
✅ 24/7 Availability
✅ Winner of the Nigel Rose Bowl Award 2018

When Should You Replace a Lock?

You might not realise how important it is to replace your locks until something goes wrong. Our expert locksmiths recommend lock replacement in the following situations:

Signs of Wear or Damage: Locks that are stiff, loose, or showing rust may soon fail.
After Moving Home: Ensure only you have keys to your new property.
Following a Burglary: Replace damaged locks immediately for security and insurance compliance.
Lost or Stolen Keys: Prevent unauthorised access by changing locks quickly.
Security Upgrades: Fit anti-snap locks or Ultion 3-star cylinders to meet modern insurance standards.

For more information about related repair services, visit our page on
👉 uPVC Door and Window Repairs

Old lock cylinder being replaced by locksmith – Hertfordshire home

Range of lock replacement types including Ultion, ERA, Yale and mortice locks

Types of Locks We Replace

We work with a full range of domestic and commercial lock types, always fitting BS3621 or 3-star rated products for peace of mind and compliance.

uPVC Door Locks

We replace and upgrade multipoint locks, gearbox units, and euro cylinders on all major uPVC door systems.

Wooden Door Mortice Locks

Expert fitting and replacement of 5-lever and sash mortice locks, ensuring strong and compliant home security.

Yale & Night Latches

Replacement of rim cylinders and night latches for wooden and composite doors, ideal for flats and older properties.

High-Security Cylinders (Ultion, ABS, ERA)

We supply and install industry-leading brands including Ultion, ERA, Yale, and Avocet ABS for anti-snap and drill-resistant protection.

For details on professional locksmith standards, see
🔗 Master Locksmiths Association – Approved Company

Lock Replacement for Homes and Businesses

We offer lock replacement services tailored for both residential and commercial properties.
Whether you’re securing your family home, rental property, or business premises, our team provides the same high standard of service and confidentiality.

All our engineers are DBS checked, fully insured, and trained to deliver non-destructive entry methods wherever possible.

➡️ Commercial Locksmith Services
➡️ Emergency Locksmith

Commercial lock replacement – Active Lock Centre MLA locksmith working on aluminium door

Anti-Snap & High-Security Lock Upgrades

Modern burglars target weak lock cylinders, often using lock-snapping techniques on uPVC doors. Upgrading to anti-snap or 3-star British Standard locks like Ultion and ABS provides an essential defence against this.

Our team ensures all replacements meet insurance-approved BS3621 or TS007 3-star ratings.

For crime prevention guidance, see:
🔗 Police Secure by Design Advice

Ultion 3-star anti-snap lock upgrade installed by MLA locksmith in St Albans

Front and French-Door Lock Upgrades in St Albans

A customer in St Albans was having difficulty locking and unlocking the front door because the key repeatedly became stuck in the euro cylinder. Inspection confirmed that the existing cylinder was worn and beginning to fail.

The faulty cylinder was replaced with an Ultion 1 Star Plus cylinder with a thumbturn, providing smoother internal operation and improved door security. After seeing the improvement, the customer requested matching cylinder upgrades for the rear French doors. Two new cylinders were supplied, fitted and tested to ensure reliable operation throughout the property.

See our locksmith services in St Albans.

Ultion cylinder lock upgrades fitted in St Albans

Locksmith testing door after lock replacement Active Lock Centre Welwyn Garden City

Our Lock Replacement Process

We take a transparent, professional approach to every job:

Assessment Identify lock type, door material, and any security issues.
Non-Destructive Removal Where possible, we remove the old lock without damage.
Replacement & Installation Fit your new lock or cylinder securely and test its operation.
Testing & Handover Demonstrate functionality and provide new keys.
Warranty & Aftercare Offer ongoing support and advice for long-term performance.

We stand behind our work with a satisfaction guarantee and trusted local reputation.

Why Choose Active Lock Centre for Your Lock Replacement?

Choosing the right locksmith makes all the difference.
Here’s why customers across Hertfordshire trust Active Lock Centre:

🔐 40+ Years of Locksmith Experience
🏆 MLA Approved and Award-Winning (Nigel Rose Bowl 2018)
💰 No Call-Out Fee, Transparent Pricing
🕒 24/7 Availability with Fast 30–45 Minute Response
🧰 Fully Insured and DBS Checked
🏠 Local, Family-Run Business Since 1980

📞 Call 01707 242874 or Request a Callback to arrange your lock replacement today.

Local Lock Replacement Across Hertfordshire

We proudly serve homeowners and businesses across:

Wherever you are in Hertfordshire, you can count on Active Lock Centre for prompt, friendly, and professional service.

Active Lock Centre van providing lock replacement services across Hertfordshire

Frequently Asked Questions About Lock Replacement

How much does a lock replacement cost?
Prices vary by lock type, but we offer fair, transparent rates with no call-out fee. Most standard lock changes range from £60–£120 depending on complexity.

How long does it take to replace a lock?
Most lock replacements are completed within 30–45 minutes, including testing and key handover.

Can you replace locks without the original keys?
Yes. Our locksmiths can safely remove and replace locks without needing existing keys using non-destructive techniques.

Do you supply Ultion or 3-star locks?
Absolutely. We install Ultion, ABS, ERA, and Yale 3-star locks, fully compliant with insurance standards.

Are your locks insurance-approved?
Yes all locks we fit meet or exceed BS3621 or TS007 3-star requirements.

What areas do you cover?
We cover all of Hertfordshire, including Welwyn Garden City, Hatfield, St Albans, Stevenage, and Hertford.

➡️ Contact Active Lock Centre Today to book your local lock replacement service.

Customer Reviews

Our reputation is built on quality, trust, and genuine customer satisfaction.
Here’s what our local clients say about our lock replacement services:

      EXCELLENT  
   Based on 246 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Luke Oates 
 
 
 
 Trustindex verifies that the original source of the review is Google. Jon came to fix the lock on our back door. He was excellent and arrived with 20-30 minutes of calling him. He was very professional, friendly and fixed the door. He had all the parts with him to fix it. He also ensured the doors were aligned at the end of the work. I would highly recommend Active Lock Centre to fix any issues with locks/doors
  
 
      Posted on Google  
   
   Rob McBride 
 
 
 
 Trustindex verifies that the original source of the review is Google. Absolutely brilliant experience - this first locksmith I tried failed to get in through our high security locks but not John. He is highly skilled and very calm and patient. He picked the lock quickly and saved the day when I was locked out with no spare keys within 300 miles of home 🙂
  
 
      Posted on Google  
   
   Clare Cole 
 
 
 
 Trustindex verifies that the original source of the review is Google. John took the call I sent him the photos , he said it can be repaired and was down fixing the metal fire door for my school in 20 mins. John completed within the hour and all working fine. Honest and got the job done thank you for coming out and resolving this quickly  Clare’s little bears pre school
  
 
      Posted on Google  
   
   Henry Seddon 
 
 
 
 Trustindex verifies that the original source of the review is Google. Brilliant job. Complex job that took time. Active locks came on tome , did job as requested and charged what they said they would. Very professional and know what they are doing.
  
 
      Posted on Google  
   
   Edward Hudson 
 
 
 
 Trustindex verifies that the original source of the review is Google. Jon got to my house in 15 minutes sharp and opened the door straight away with no hassle. Highly recommend!
  
 
      Posted on Google  
   
   Smita Ved 
 
 
 
 Trustindex verifies that the original source of the review is Google. Skilled, and friendly service. Front door realigned  to ensure it double locks with ease. Reasonable charges.  I would highly recommend .
  
 
      Posted on Google  
   
   Emma Calvert 
 
 
 
 Trustindex verifies that the original source of the review is Google. Turned up in 10 minutes. Brilliant service. Good advice and installed a more appropriate lock for older people!
  
 
      Posted on Google  
   
   Sayad Miah 
 
 
 
 Trustindex verifies that the original source of the review is Google. Just had John service my patio windows and doors and back garden door. Excellent job, definitely use him again. Very experienced locksmith and prices are decent. Keep up the good work John. 👍🏽
  
 
      Posted on Google  
   
   Mike P 
 
 
 
 Trustindex verifies that the original source of the review is Google. Honest, responsive and talented locksmith. Jonathan arrived when promised, resolved our problem and lubricated the lock. After hearing about the scammers Jonathan explained clearly what he would do and delivered exactly as promised. Recommended by us.
  
 
      Posted on Google  
   
   Freddie Hutchinson 
 
 
 
 Trustindex verifies that the original source of the review is Google. Jonathan kindly provided us with a free survey to allow us to understand the difference in the locks that we could choose to put on the front door. This allowed us to make the right decision from his advice and explanations He was patient with us whilst we arranged a date for him to install the lock and helped realign the door. We would recommend Jonathan to anyone that needs any form of assistance or their locks changed. Thanks again!

Book Your Lock Replacement Today

Don’t risk your home or business security contact Active Lock Centre today for professional lock replacement by trusted, MLA-approved locksmiths.
We’re available 24 hours a day, 7 days a week, across Hertfordshire.

📞 Call 01707 242874 or Get in Touch Online
Your local, family-run locksmiths Active Lock Centre, keeping Hertfordshire secure since 1980.