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Double Glazing Spares

UPVC Window Lock Mechanism

Huge Range of Replacement UPVC Window Locks

We stock a large range of upvc window lock mechanisms. The selection we offer covers the most common types used over the last 30 years. These window locks have been primarily used on uPVC windows although they have also been fitted to timber windows occasionally.

If this is your first time buying a replacement upvc window lock, you may find our identifying guide useful. We also detail lock information on the product pages.

What is a Window Lock Mechanism?

A upvc window lock mechanism is the gearing part inside a window that's driven by a handle. The upvc window lock below shows one of many different types.

Dimension A- Backset
Dimension B- Mushroom Height
Dimension C- Rail Length
Dimension D- Rail Width(Click on link below)
The long metal plate is the rail and the part in the centre of the window lock is the gearbox.

Window Lock Identification Guide, Click Here.



Mila Window Lock Inline Espagnolette 350mm Length

Mila Window Lock Inline Espagnolette 350mm Length

This Mila window lock should have MILA printed onto the faceplate...

£11.95



Mila Inline Shootbolt upvc Window Lock Gearbox

Mila Inline Shootbolt upvc Window Lock Gearbox

This Mila Window lock comprises of three pieces. This item is the...

£10.45



Mila upvc Window Lock Gearbox - Extensions

Mila upvc Window Lock Gearbox - Extensions

The extensions come in different size ranges. Please measure the...

£9.50



Mila Offset Espagnolette upvc Window Lock - U Rail

Mila Offset Espagnolette upvc Window Lock - U Rail

This mila offset espagnolette upvc window lock is silver in colour...

£0.00


 Sold Out 

Mila Offset Shootbolt upvc Window Lock Gearbox

Mila Offset Shootbolt upvc Window Lock Gearbox

This lock has been discontinued by the manufacturer. The Mila Inline...

£13.95


 Sold Out 

Saracen upvc Window Lock Gearbox - Deadbolt

Saracen upvc Window Lock Gearbox - Deadbolt

This Saracen upvc window lock comes in three pieces. The Saracen...

£8.95



Saracen upvc Window Lock Gearbox Extensions - Deadbolt

Saracen upvc Window Lock Gearbox Extensions - Deadbolt

The extensions are for Saracen Deadbolt Shootbolt Gearboxes. The...

£8.50



Saracen/Scope upvc Window Lock Gearbox - Cam

Saracen/Scope upvc Window Lock Gearbox - Cam

This multi point window lock comes in three pieces. The...

£8.75



Saracen upvc Window Lock Gearbox Extensions - Cam

Saracen upvc Window Lock Gearbox Extensions - Cam

The extensions are for Saracen Cam Shootbolt Gearboxes. They come in...

£8.25



SNSI Offset Espagnolette upvc Window Lock - Flat Rail

SNSI Offset Espagnolette upvc Window Lock - Flat Rail

This espagnolette window lock mechanism does not have any letters or...

£12.95



WinkHaus MultiPoint upvc Window Lock Gearbox

WinkHaus MultiPoint upvc Window Lock Gearbox

This Wink Haus multi point upvc window lock comes in three pieces....

£11.95