What is a dummy sash window?

15th Jan 2017
Dummy Sash uPVC Window

The upper section of double glazed window units will often be made up of top ‘opener’ windows adjacent to fixed panes. Naturally, the opener mechanism causes an aesthetic discrepancy between the opener windows and fixed panes. As a result, the top windows do not sit aesthetically level in the double glazed unit. This aesthetic has no implication on the functionality of the casement windows, however, some homeowners prefer the look of dummy sash casement windows. But what are dummy sash windows?

What is a dummy sash window?

Dummy sashes are also known as dummy vents. They are installed to create an equal line between top ‘opener’ windows and fixed panes. The fixed window panes are fitted with ‘dummy’ sashes which imitate the look of the opener windows, making all the visible panes sit in line. The opener windows and dummy window frames will create an ‘equal sight line’, appearing as if they are all opener windows.

Dummy windows – add a bespoke style to your replacement windows

Unlike a standard fixed light window which can be opened and closed, dummy windows are not able to be opened. That’s why there are also known as false or fake sashes, because they only serve a decorative purpose rather than a functional one.

Equal slight line windowsMock Sash Windows in Cream

An equal sight line window is where the windowpanes are all aligned together. So the glass panes, frames and any glazing bars are in line with each other for a sleek and clean appearance.

Dummy sashes can slightly reduce the amount of area that lets in light. However, an equal sightline is more pleasing to the eye and is therefore often a preferred choice for homeowners for adding style to a property. It’s a small compromise but windows with equal slight lines are a sure way to add kerb appeal to any home.

Windows with equal sightlines are commonly found in older and period style properties and are therefore worth considering if you have an older style of home and require new or replacement windows for listed properties or homes in conservation areas.

Which window styles can have dummy windows?

Slimline windows and composite door in white

Dummy windows are most commonly installed with new casement windows, sash windows or flush casement windows. This is because these window styles are versatile in their designs and can incorporate several windowpanes together for a complete window installation.

Experienced double glazing installers will be able to illustrate a range of window designs that include dummy sashes so that you can choose the perfect appearance for your home, whether that be one top dummy window or a set of three to add a bespoke touch. The design options are endless!

Dummy sash windows with decorative glazingslimline uPVC window white internal view

Dummy sash windows are also recommended if you are considering decorative glazing for your new windows.

Choosing a dummy sash for a decorative window unit ensures that the decorative glazing appears the same in each adjacent pane of glass for a seamless design across your home.

Decorative glazing comes in a variety of design choices, including leaded, frosted and obscured glass. So you can really add a personal touch to your new windows whilst retaining your home’s privacy if required.

We install dummy sash casement windows and dummy sash windowsRosewood-slimline-windows-installation

Our expert window design team can help you to create truly bespoke windows that fit perfectly with the style of your home. Each and every window that we install is bespoke to each property, so you can choose a unique design that meets your individual requirements.

Dummy windows are a flexible and simple way to add a bespoke touch to replacement windows, and with a range of window colours, designs and styles, we’re a leading double glazing installer who you can trust to ensure that you get the perfect replacement windows.

If you would like help and advice or to discuss your new window project with us, contact our showroom today and a member of our team will be happy to help. Alternatively, take a look at our inspirational window image gallery to get some ideas.

Get a free no-obligation quote for new dummy sash windows in Surrey and the surrounding area today!