When it comes to keeping your home secure, not all locks are the same. Across the UK, there are several types of door and window locks, each designed for specific materials and levels of protection. Many homeowners use these locks every day without knowing their names or how they work. Understanding them can help you make better choices when upgrading your home security.
At RJ Parker Locksmiths, we work with a wide range of locks on doors, windows, garages and gates throughout Coventry and Warwickshire. We are often asked by clients to explain the differences between various types of locks and which are most suitable for their property. To make things simpler, here is a clear guide to the most common locks found in UK homes and what makes each one unique.
Mortice Locks
Mortice locks are a familiar sight on traditional wooden front and back doors. They are fitted inside the door itself, within a pocket known as a mortice, which makes them both secure and discreet.
Five Lever Mortice Locks
The five lever mortice lock is one of the most secure types available for timber doors. The five levers refer to the internal mechanisms that must align precisely to release or secure the bolt. Most insurance providers recommend using locks that meet British Standard 3621, which is marked with a kitemark on the lock face. These locks provide strong resistance against picking and forced entry, making them ideal for external doors.
Three Lever Mortice Locks
The three lever mortice lock works in the same way but with fewer levers, making it suitable for internal doors where high security is not essential. For example, you might use one on a home office, utility room or storage area that you want to keep private.
Euro Cylinder Locks
Euro cylinder locks are among the most widely used in the UK, particularly on uPVC and composite doors. They are popular because they work with multipoint locking systems, which secure the door at several points when the handle is lifted.
Standard Euro Cylinders
A standard euro cylinder is easy to replace, which is one reason it became so common. However, older models are vulnerable to a technique known as lock snapping. This is when an intruder breaks the cylinder to gain access.
Anti Snap Euro Cylinders
Modern anti snap euro cylinders are now the recommended choice for any external uPVC or composite door. These locks include a reinforced section that breaks in a controlled way if attacked, preventing the intruder from reaching the mechanism inside. Look for cylinders that meet TS007 or SS312 Sold Secure Diamond standards for the best protection.
Euro cylinders can also include anti pick, anti drill and anti bump features for added peace of mind.
Rim Locks and Night Latches
Rim locks are fitted to the surface of the door rather than inside it. The most common type is the night latch, often seen on older properties or secondary front doors.
A night latch automatically locks when the door closes, which makes it convenient but not always the most secure option by itself. For that reason, many homeowners combine a night latch with a five lever mortice lock for improved protection.
Modern night latches come in various designs, including keyless or digital versions, and can also include deadlocking functions that stop the latch from being opened even if the glass panel in the door is broken.
Multipoint Locking Systems
If you have a modern uPVC, composite or aluminium door, it probably uses a multipoint locking system. These systems secure the door at several points along the frame, usually with hooks or bolts that engage when the handle is lifted. The mechanism is then locked in place by turning the key.
Multipoint locks are highly secure when maintained properly, but they do rely on a well-fitted cylinder. Combining a multipoint system with an anti snap euro cylinder is the best way to protect this type of door.
Over time, the alignment between the door and frame can shift, making the mechanism feel stiff. Regular servicing by a qualified locksmith keeps it operating smoothly and helps prevent costly repairs later.
Window Locks
Windows are often the weakest point of home security, yet they are one of the most common entry routes during a break-in. There are several types of window locks found in UK homes, and each one plays an important role in keeping intruders out.
Espagnolette Locks
These are typically fitted on modern uPVC windows. When the handle is turned, multiple locking points engage along the edge of the frame, creating a secure seal. Espagnolette locks are reliable and provide good protection when used with quality window handles.
Sash Window Locks
For traditional sliding sash windows, a sash lock or sash stop is used to prevent the window from being lifted or slid open. These are small but very effective, and many designs allow you to lock the window slightly open for ventilation without compromising security.
Casement Window Locks
Casement windows open outward and are often fitted with locking handles or stay locks. These secure the window to the frame when closed. For added safety, key operated casement locks can be installed to prevent tampering from outside.
Patio and Sliding Door Locks
Patio doors, whether sliding or bi-folding, need specific locks to ensure they cannot be lifted or forced from their tracks.
Sliding doors often use a hook bolt lock that engages into the frame when closed. Bi-fold doors usually rely on multipoint systems similar to those used in composite doors. Adding an extra lock or security bar can provide even more protection.
RJ Parker Locksmiths can inspect patio and bi-fold door locks to ensure they are correctly aligned and meet current security standards.
Smart Locks
Smart locks have become increasingly popular in the UK, offering keyless entry through mobile apps, PIN codes or keycards. They can integrate with home automation systems and provide detailed activity logs.
While convenient, it is important to choose a model that meets BS EN 14846 and includes mechanical override options. A professional locksmith can help you install and configure these systems safely, ensuring that convenience never comes at the expense of security.
Why Knowing Your Lock Type Matters
Understanding the types of locks fitted in your home makes it easier to identify weak spots and know what upgrades to request. If you ever lose your keys or move into a new property, a locksmith will ask what kind of lock you have. Being able to answer confidently helps them bring the right parts and tools, saving time and cost.
Knowing your lock type also helps when checking your home insurance requirements. Many policies specify that external doors must have a five lever mortice lock or an equivalent approved mechanism.
Final Thoughts
Every lock in your home, whether on a front door, garage or window, plays a part in protecting your property. Taking time to understand how they work is an investment in peace of mind.
At RJ Parker Locksmiths, we provide expert advice and professional lock installation, replacement and repair services across Coventry, Warwickshire and the surrounding areas. If you are unsure about the types of locks in your home or want to upgrade your security, we are always happy to help.
Contact RJ Parker Locksmiths today for friendly, local advice and a free security assessment.