How to Fit & Install a Door Lock and Secure Your Home

Door Locks

Fit & Install a Door Lock: A Comprehensive Guide

Installing a door lock is an essential skill for homeowners looking to enhance their security. This guide provides a detailed, step-by-step approach to fitting and installing various types of door locks, ensuring your home remains safe and secure.

Tools and Materials Needed

  • Screwdriver set
  • Drill and drill bits
  • Tape measure
  • Chisel
  • Hammer
  • New lock set

Step-by-Step Installation

1. Choosing the Right Door Lock

  • Select a lock that suits your door type and security needs. Consider locks with a British Standard kitemark for enhanced security.

2. Removing the Old Door Lock

  • If replacing an existing lock, use a screwdriver to remove the screws on the handle and the faceplate. Carefully withdraw the old lock mechanism from the door.

3. Preparing the Door

  • Measure the dimensions of the new lock. Mark the key points on the door where the new lock will fit.
  • Drill the necessary holes for the lock body and for the keyhole. Be precise to ensure a snug fit for the lock components.

4. Fitting the Door Lock

  • Insert the new lock into the door, aligning it with the holes you’ve drilled. Use a chisel to make adjustments if the fit isn’t perfect.
  • Once in place, screw the lock into the door, securing the faceplate over the mechanism.

5. Installing the Strike Plate

  • Align the strike plate with the lock bolt on the door frame. Mark the position where the strike plate will be fixed.
  • Chisel out a recess in the frame so that the strike plate fits flush against the surface.
  • Secure the strike plate with screws.

6. Testing the Door Lock

  • Once everything is installed, test the lock multiple times to ensure it operates smoothly. Check both the locking mechanism from the inside and the key function from the outside.

Securing Front Doors and Porches

1. High-Security Locks:

  • Opt for deadbolts or multi-point lock systems for external doors, such as your front door and porch entrances.
  • Consider locks that meet British Standard (BS) 3621, as they are tested against common burglary methods like drilling and picking.

2. Additional Security Measures:

  • Install a Door Viewer and Chain: Adding a door viewer and a security chain provides extra security allowing you to see who is at the door without fully opening it.
  • Reinforce the Door Frame: Strengthen the door frame with a metal plate to prevent the door from being kicked in.

3. Fitting Process:

  • Align and Mark: Similar to internal doors but be precise as the alignment needs to be perfect for additional security.
  • Secure the Lock: Ensure all components are aligned, then fix them into place using screws long enough to anchor into the solid part of the door.

Securing Sheds and External Storage

Garden Sheds
1. Choose a Suitable Lock:

  • For wooden sheds or bike sheds, a robust padlock and bolt system can be very effective.
  • Consider padlocks that are weather-resistant and designed to resist tampering.

2. Installation Tips:

  • Secure the Hinges: Replace standard screws with long, tamper-proof screws.
  • Fit the Bolt: Install a heavy-duty bolt through the door and into the frame.
  • Lock It: Attach the padlock through the bolt to ensure the door remains securely closed.

FAQ on Door Lock Installation

Q1: How do I choose the right drill bit for installing a lock? A: Use a drill bit that corresponds to the size of the holes specified in the lock installation instructions.

Q2: What should I do if the new lock is stiff? A: Lubricate the lock mechanism with graphite powder or a suitable lubricant. Avoid oil-based products as they can attract dirt.

Q3: How can I ensure my door lock is secure? A: Opt for locks certified by British Standards (BS3621) for external doors. Ensure that the door frame is sturdy and the lock is properly installed.

Q4: Can I install a smart lock myself? A: Smart locks may require different steps, particularly for connecting to home networks. Follow the manufacturer’s instructions carefully and consider professional installation for complex models.

Q5: What are the common mistakes to avoid when fitting a door lock? A: Common mistakes include not measuring the door and lock correctly, not drilling holes cleanly, and forcing parts into place which can damage both the lock and the door.

Q6: How often should I replace my door locks? A: Replace door locks every few years or when you move into a new house, or after losing keys.

Q7: What is the most secure type of door lock? A: Deadbolts are considered very secure due to their thick bolt mechanism that isn’t easy to manipulate.

Q8: Can I install these locks myself? A: Yes, with basic DIY skills, you can install most types of locks. However, for complex locks like multi-point systems, professional installation might be recommended.

Q9: How do I improve the security of sliding doors? A: Install a secondary locking mechanism, like a foot bolt, and use a security bar that prevents the door from being forced open.

Q10: What should I do if my key breaks in the lock? A: Use needle-nose pliers to try to extract the broken piece. If unsuccessful, call a locksmith to remove the key and assess the lock for potential damage.


Securing your home with properly fitted locks is crucial for your safety and peace of mind. From internal doors to external gates and sheds, the right lock can make all the difference. Follow these steps to ensure that your home is a fortress against intrusions. For more detailed guidance or professional installation, consider contacting experts like Low LTD, who specialise in securing homes and commercial properties.