Sash Windows Parts for Restoration

We feel it’s important for our customers to know the core components and parts that make up a sash window. Maybe you’re looking to repair your sash window or you’re looking to replace a few parts to aid its functionality, our guide will help you restore your sash window to its former appearance.

What are the main parts of a sash window?

There are several parts and components that make up a sash window. We have labeled them below so that you are able to not only identify the different areas but identify what parts you require for restoration (if required).


The architrave is a moulded trim that covers the frame and the wall. The trim provides a clear indication on the age of the window.

Axle pulley

A pulley is essentially a wheel with a groove in it. A cord or cable is placed in the groove and when pulled, allows it to pull the object (in this case, a sash window) up and down. Axle wheels on sash windows can come in many materials, such as brass, iron, and nylon.

Bottom rail

This is located at the lower end of the sash and its purpose is to allow room for the slope of the cill.


On that note, the cill acts as the frame on which the box-frame is constructed. Most premium sash windows use hardwood when building the box-frame as this allows better protection from the elements and looks far superior.


Draught strips are not present in all sash window designs, but it is a welcome addition in the right circumstances. For example, if you live on the coast or experience draughting problems, a draught strip may be incorporated into the design. They are usually inserted into the staff and parting beads (more on these below) at the and the bottom of the meeting rails.

Fitch catch

There are a few catches that can be used in a sash window, but a flitch catch is the most common. It’s mounted on the meeting rails to fasten the window.


As most people are aware, glazing comes in a few variations, single glazing, and double glazing. Most sash window designs incorporate a single glazed finish but if you are looking for superior thermal efficiency, you can opt for double glazed sash windows. This is something we provide, and each window is constructed to mimic the traditional design of a sash window with the combined benefit of being thermally-efficient.

However, if you are living or renovating a listed property, you may only be able to install single glazed windows.


Horns are typically used to strengthen the joints of the window and prevent it from being opened too far.

Inside lining

As the name suggests, the inside lining is the lining that lines the inner sides of the box frame.

Meeting rails

The name given to the top and bottom meeting rails (position at the top and bottom of the sash window). They play the important port of boosting the durability and security of the window.


This part of the sash window juts out from the lower side of the frame. The reason for this is because sash windows are typically built into the inner side of the property’s brickwork.

Parting bead

The parting bead serves to separate the sashes (to allow for easy mobility) and holds them in place so they don’t fall when opened. They remain in place thanks to the pulley-stiles and head.


The pocket allows easy access into the weights within the sash.

Pulley stile

The pulley stile is responsible for bearing the weight of the sashes and the weights. It’s positioned over the axle-pulley.

Sash bar

Sash bar (or sash-gut) serves to separate the panes of glass (if the window has more than one window pane). This prevents rubbing and catching.

Sash cord

This is simply the rope that is fed through the axle pulley.


As the name suggests, sash lifts help you raise the bottom sash. They are usually made from metals (typically brass) but can be made from wood.

Sash weight

Sash weights keep the sash balanced so they are able to remain fixed in position when pulled up.


This is the moulding that covers the sash join between the outer redlining and the masonry.

Spiral balance

Unlike the traditional means of balancing a sash window, spiral balances use a spiral-based mechanism which includes a spring that helps to suspend the weight of the sash. In box-frame sash windows, they are positioned within the edges of the sash stiles, in modern sash windows they are placed into the frame stiles.

Staff bead

This is a molded bead responsible for securing the bottom sash. Staff beads are screwed into the inner lining of the frame.


Positioned on both sides of the sash, stiles are the moudlings.

Top rail

The top rail of the sash window.


A trickle-vent is ideal for customers who require a small gap or vent for air to pass through.

Window board

Ideal for placing trinkets for decorative purposes.

Are You Looking to Buy or Replace Your Sash Windows?

Hopefully, this sash window parts guide has helped you to understand the core components and parts of what makes up a sash window. Whether you’re restoring your sash windows or are perhaps considering purchasing entirely new ones, we can help. We provide customers with completely bespoke sash windows across London. Each window is made bespoke for your home, and with a range of styles, materials, colours and fittings, our team can transform the appearance of your home with a beautifully-crafted sash window.

Upon your purchase, you will receive several guarantees to ensure your windows stand the test of time and maintain their stunning appearance for years to come.

Contact our team today to purchase your sash windows.