How to Change a Lock on a Double Glazed Door (Step-by-Step Guide)


Double glazed doors are a popular choice for homes and businesses due to the levels of energy efficiency and durability that they offer.  

However, like any other door, the locks on double glazed doors may need to be replaced over time for various reasons, such as security concerns or wear and tear. 

If you’re wondering how to change a lock on a double glazed door, you’ve come to the right place. 

In this step-by-step guide, we’ll walk you through the process, ensuring that you can secure your double glazed door effectively.

How to change a double glazed door lock 

In order to successfully change a double glazed door lock, you need to do the following: 

1) Unscrew the double glazed door lock 

The first step in changing a double glazed door lock is to remove the old lock. To do this, you’ll need some basic tools like a screwdriver. Then you can:

  • Identify the screws holding the lock in place on the interior side of the door. Typically, there are two to four screws that secure the lock plate and cylinder.
  • Use the appropriate screwdriver to carefully unscrew these screws. Make sure to keep the screws in a safe place, as you’ll need them later when installing the new lock.

When it comes to tightening screws, always be careful not to overtighten the screws too much. 

2) Remove the double glazed door lock 

Once you’ve removed the screws, you can now take out the old double glazed door lock. The lock may consist of a cylinder, latch, and other components. To remove it:

  • Gently pull the lock out of the door, ensuring you don’t damage the door or the surrounding frame.
  • Be patient and cautious while doing this, as you don’t want to cause any damage to the door or its mechanisms.

3) Replace the old double glazed door lock with a new one 

Now that you have successfully removed the old lock, it’s time to install the new one. To do this, you’ll need a replacement lock suitable for your double glazed door. Here’s how to proceed:

  • Carefully unpack the new lock and inspect its components to make sure everything is in order.
  • Align the new lock with the opening in the door where the old lock was removed.
  • Slide the lock cylinder, latch, and other components into their respective openings, making sure they fit snugly.
  • Ensure that the keyway (where the key is inserted) is properly aligned.

4) Put the screws back in 

With the new lock in place, it’s time to secure it by reattaching the screws. Follow these steps:

  • Insert the screws into the screw holes on the lock plate and cylinder. Make sure the screws align with the holes in the door.
  • Use your screwdriver to tighten the screws. Be careful not to over tighten them, as this could damage the door or the lock.

If instead of changing your double glazed lock, you’d rather buy a new one, check out our Reynaers Glazed Door range

5) Check if it locks and unlocks correctly 

After securing the new lock in place, it’s crucial to test it to ensure it functions correctly. Here’s how to do it:

  • Insert the key into the new lock and check if it turns smoothly, allowing you to lock and unlock the door without any resistance.
  • Test the latch to ensure it engages with the door frame properly and securely.

If the lock operates smoothly and the door locks and unlocks as expected, congratulations – you’ve successfully changed the lock on your double glazed door!

Secure your double glazed door today 

Changing a lock on a double glazed door might seem like a daunting task, but with the right tools and our step-by-step guide, it can be a manageable DIY project. 

By following these instructions, you can replace your old lock and enhance the security of your double glazed door, providing peace of mind for your home or business.

(If you would much prefer to buy a new front door and would like some information on costs, check out our ‘How Much is a New Front Door?’ article)

FAQs about changing a double glazed door lock 

Is changing the lock on a double glazed front door easy?  

Changing the lock on a double glazed front door can be relatively straightforward if you have the necessary tools and some DIY experience. 

However, it’s essential to be patient and cautious during the process, as mishandling the lock or the door itself can lead to complications. If you’re unsure about your DIY skills or face any difficulties, it’s advisable to seek the assistance of a professional locksmith.

What tools do I need to change a double glazed front door lock? 

To change a double glazed front door lock, you’ll need the following tools:

  • Screwdriver: To remove and install screws.
  • New Lock: Make sure you have a suitable replacement lock for your double glazed door.
  • Key: Ensure the new lock comes with the necessary keys.
  • Patience and Caution: A steady hand and careful approach are crucial to prevent any damage during the process.

Are double glazed doors energy efficient? 

When it comes to searching for a new energy efficient front door, double glazed doors are a great choice. 

We’re pleased to confirm that all doors in our Full Glazed Doors collection not only have terrific energy ratings, but also come with the option to upgrade to triple glazing for more improved energy efficiency. 

How much does it cost to purchase a new double glazed front door lock? 

The cost of a new double glazed front door lock can vary depending on the brand, quality, and type of lock you choose. 

Basic lock replacements can start at around £20, while more advanced and secure options may cost £100 or more. 

It’s essential to select a lock that meets your security requirements and fits your budget.

In conclusion, changing the lock on a double glazed door can be a DIY project that enhances your security and peace of mind. By following these steps and considering the type of lock that suits your needs, you can keep your double glazed door secure and functional for years to come. 

If you have any doubts or concerns about the process, don’t hesitate to consult a professional locksmith for assistance.

For more information on the cost of a new front door, click here to read our article on this. 

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Tia Ellahi
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