You can indulge in the timeless appeal of traditional timber sash windows and benefit from the innovations found in modern uPVC windows. Clydebuilt’s Vertical Slider Windows deliver the best of both worlds, including a dual opening function that adds easy cleaning and further ventilation to the list of benefits.

Tilts and Slides.

From the outside, it’s difficult to determine this modern alternative from the original timber windows, yet the maintenance usually associated with such beautiful features is virtually non-existent with Vertical Slider Windows. With the ability to tilt as well as slide, these windows also offer years of life with little intervention. uPVC construction results in a window that doesn’t rot, swell or warp, while never needing repainting.

Energy efficiency is an ongoing battle with many older properties, with potentially ill-fitting single-glazed windows being a major source of heat loss.

Reduces Noise.

Replacing your traditional timber sash windows with uPVC Vertical Slider Windows virtually eliminates this issue, reducing the money you spend on heating your period home.

They can also reduce the level of exterior noise & draughts that penetrate your home, leaving you to enjoy a peaceful, warm haven. Many period properties are subject to stricter planning regulations, particularly if situated in conservation areas.


Some Stunning Colours

A beautiful range of colours and stains, including uPVC woodgrain finishes, which look like real wood, but without the maintenance. Plus, dual colours with white inside and a second shade on the exterior, in-keeping with both the character of your property and inside décor.

With Some Key Features.

  • Traditional timber window look
  • Slide or tilt function for easy cleaning and ventilation

  • Improved heat retention
  • Low maintenance
Anthracite Grey

Anthracite Grey

Basalt Grey

Basalt Grey

Agate Grey

Agate Grey

Pebble Grey

Pebble Grey

Silver Grey

Silver Grey

Chartwell Green

Chartwell Green

Slate Grey

Slate Grey

Beck Brown

Beck Brown

Light Oak

Light Oak

Golden Oak

Golden Oak


Standard Cream


Rosewood Grain


Standard White

Our Accreditations

We take quality seriously, so we’re proud that our standards are endorsed by all the relevant industry bodies and glazing associations. MORE ABOUT ACCREDITATIONS

The Clydebuilt Process

From manufacturing, fabricating, designing and installing we put quality at the centre of your whole experience from start to finish

network veka blueberry house


We design every window and door to make your house a home

network veka blueberry house


We ensure that the measurements and styles are confirmed

tilt turn


Our accredited installers install leaving your home as they found it

french door irish oak px px scaled


Once complete and satisfied you will receive your guarantee

Sliding Sash Windows FAQs

A sash window is a style of window that is designed to open vertically. Sash windows are especially common in traditional architecture and design. This kind of window consists of two sashes, one placed in front of the other, called a sliding sash. These types of windows sit inside frames that have straight grooves, so they move up and down smoothly without damaging the frame.

From the outside, it’s difficult to determine this modern alternative from the original timber windows, yet the maintenance usually associated with such beautiful features is virtually non-existent with Vertical Slider Windows. With the ability to tilt as well as slide, these windows also offer years of life with little intervention. uPVC construction results in a window that doesn’t rot, swell, or warp, while never needing repainting.

To measure up for replacement sash windows, you need to measure the sash window width & height, as well as the box frame width and height (the size of the hole in which the window is set). Clydebuilt’s replacement sash windows are custom-made to fit your home. Fill in the form on our website, and we’ll send a member of the team out to measure up for you

Sash windows have gone through a significant evolution over time. In the past most sash windows functioned with a system that levels the sash with a steel, cast iron, or in some cases lead counterweight. That weight is then hung on a cord that is located in a box inside the frame.

In sash windows today, it is more likely that they will have a spring balance (or sash balance) process. This is a spring-loaded device that counteracts the pull of gravity, which essentially holds open your window without the need for cords, pulleys, and metal counterweights.

At Clydebuilt Home Improvements we can provide modern sash windows in Perth that will give your home an amazing classic look with the advantages of modern technology.

They give your home a traditional style

There are many benefits to sash windows, but the first is tradition. With their traditional charm, sash windows fully embody the dated ‘Olde English’ village look. Sash windows have a rich history and are truly classic elements of style, evoking Victorian times. However, they also have practical applications within the modern properties today.

In a postmodern society, where traditional buildings are being torn down to be replaced by large glass and steel constructions, many people have found themselves yearning for a sense of history and tradition that comes from buildings that have been around for more than just a decade or two. A sash window is the perfect construction to remind you what has come before and the true original beauty of the buildings in your neighbourhood.

They are perfect for properties in conservation areas

If you own one of the beautiful properties in conservation areas or that are classified as listed buildings, then chances are you will want to improve them without destroying their original architecture, but you will require special planning permission to make changes. This is where custom sash windows come in. These are called Heritage Windows because they are designed with an intention of looking similar to the original ones, preserving the history and character of the building but still updating to modern features and benefits.

Typically, local authorities will prefer that you repair the windows instead of replacing them. However, in situations where repairs would not be possible or not worth doing, the planning authority will have to approve your new window design. To ensure you get the best new windows for your listed building you should work with a professional manufacturer like Clydebuilt Home Improvements that has experience in designing and installing authentic replacement sash windows in Perth.

They provide better ventilation

Sash windows open from the top and the bottom of the window at the same time, meaning they serve as excellent ventilation systems which effectively cool rooms during hot weather. Seasonal pressure balance ventilation systems allow fresh air to come into your house and stale air to naturally exit out through sash windows’ two perfect apertures: one at the top of the window and one at the bottom of the window.

These types of structural installations not only cool and aerate your home, but also help remove any potential dust from circulating around inside your room. Another great benefit is that they pose no danger of slamming shut as there are no hinges on sash windows.

They can improve energy efficiency and reduce noise

To keep your home warm in winter and cool in summer you need windows that are durable with high levels of thermal performance, like sash windows from Clydebuilt. This will not only ensure your home is at a comfortable temperature all year round but also save you money on your energy bills.

Another useful benefit you can get from this type of window is the level of noise reduction you will get. Sash windows provide useful solutions for older homes if made with uPVC to accommodate different styles but keeping them energy efficient is essential when installing them on your property.

Sash windows are a popular design that has been around for centuries. You will typically find sash windows in older properties dating from the 17th to 19th century. Being an original feature of many listed buildings, they are also often included in conservation areas. It is quite common to find sash windows on properties restored based on how they looked during the Georgian or Victorian era.

Although prices of new sash windows can be very high compared to uPVC alternatives, it’s important to remember that you get what you pay for; sash windows will last much longer with the right maintenance and can look great for decades into the future while keeping out draughts and noise like no other type of window due to their authentic craftsmanship.

Choosing the best style of window for your property can be a compromise between cost, aesthetics, and durability. Traditional timber frames require regular maintenance, and each sash window should ideally be checked and possibly repainted every five years as small cracks and flaking paintwork can be a problem. Also, as the paint is covering the wood underneath, be aware of deterioration so you can prevent the frames from rotting or swelling.

uPVC material is much less burdensome for homeowners to keep well maintained as they can simply wipe them down with soapy water any time dirt begins to build up. By choosing last generation’s advanced styles and designs you will still enjoy an authentic look that blends in seamlessly with the rest of the exterior.

Generally, there are three main types of sash window design. The one that you should opt for will depend on what you think will suit your home best, and what period your house was built in (or designed to imitate).


Georgian sash windows are made from two units each with six panes of glass, sometimes called ‘six over six’.


Victorian sash windows can be identified as having a ‘two over two’ design. Each unit has two panes of glass that are attached by one vertical glazing bar.


Edwardian sash windows typically have a ‘six over two’ design.

Other types of sash windows include:

  •       Venetian windows- these have a central sliding sash in between two fixed panes either side.
  •       The Queen Anne Revival- this style brings together multiple panes in the upper sash but only one or two in the lower.
  •       Sashes were typically arched instead of rectangular in Regency or Gothic revival periods, and in some regions it is popular to have horizontal sliding sashes.

The popularity of sash windows began to decline after the Edwardian era, mainly as a result of the First World War which saw easier to build steel or casement windows becoming more commonplace for homeowners. However, over recent years sash windows have seen a popularity revival with homeowners who want to preserve the classic look of their property whilst having the benefits of modern installation.

In short yes, it is possible to fit single glazed units on a lot of sympathetic restorations, but modern building regulations make it pretty much impossible to have single glazed windows on a new house and there are many new products with double glazed sash designs, meaning double glazing is the standard for the majority of new windows.

As previously mentioned, concerns over the energy efficiency of period homes may also encourage you in the direction of replacing single panes with double when renovating and looking for the right new windows for your home. We pay close attention to detail with our sash windows to ensure the delicate and traditional look is not lost in modernisation with double glazing and other features.

Whilst sash windows can be repaired, whether you are updating your home, or taking on a period renovation project, if they are beyond repair you can find authentic and high-quality sash windows in Perth from Clydebuilt Home Improvements.

 Our team has more than 100 years’ experience in total in the industry and has brought their extensive knowledge and skills to Clydebuilt, meaning we only provide the best of the best in windows and doors. Contact us today to get the perfect sash windows for your home.

More in the Windows Range

Choose from a selection of contemporary and modern windows to suit your home



fit show images


lo veka external rt final




Join 1000's of Satisfied Customers

Each and every customer gets a service that is second to none, find out what makes our customers so happy. SEE VIDEO TESTIMONIALS