Last Updated on February 21, 2025

Sash windows are a timeless and elegant choice for UK homeowners and landlords, offering a blend of traditional aesthetics and modern efficiency. These windows are especially common in properties such as Georgian, Victorian, and Edwardian homes, which feature the classic, symmetrical designs that sash windows complement beautifully. 

Sash windows are also found in many townhouses, period properties, and listed buildings across the UK.

Whether you’re considering new sash window installation, sash window replacement, or upgrading to double glazed sash windows, understanding the costs involved is essential.

In this guide, we’ll break down the cost of sash windows based on material types (uPVC, timber, and aluminium), glazing options, and installation factors, ensuring you make an informed decision.

What Is the Average Cost of Sash Windows?

The cost of sash windows varies depending on factors such as material, size, and glazing type. On average, uPVC sash windows are the most affordable, while timber and aluminium options tend to be more expensive due to their durability and aesthetic appeal.

Larger windows and custom features like Georgian bars or arched tops can further increase the price. Below is a simple breakdown of new sash window costs based on material and size.

Material	Small (600mm x 900mm)	Medium (900mm x 1200mm)	Large (1200mm x 1800mm)
uPVC	£500 – £900	£700 – £1,200	£900 – £1,500
Timber	£900 – £1,500	£1,200 – £2,000	£1,800 – £3,000
Aluminium	£1,200 – £2,000	£1,800 – £3,000	£2,500 – £4,000

These prices are per window and exclude installation costs, which typically range from £250 – £500 per window depending on complexity.

Factors Affecting the Cost of Sash Windows

Multiple factors influence the overall cost of sash windows. Understanding these factors not only helps you make informed decisions but also allows you to plan your budget effectively. 

Below we explore how different elements such as window materials, glazing options, installation complexity, and property type impact the pricing of sash windows.

Type of Sash Window Frame

The material used in constructing your sash window frames plays a significant role in determining the cost. Common frame materials include timber, uPVC, and aluminum. 

Timber sash windows, often considered a premium option, are highly sought after for their traditional aesthetic and excellent insulation properties.

uPVC sash windows are typically more affordable, offering durability and low maintenance. 

Aluminum sash windows provide a modern alternative with sleek finishes, but they may be slightly more expensive due to the cost of materials.

Glazing Options for Sash Windows

The choice of glazing can significantly affect both the performance and cost of sash windows. There are three primary glazing options: secondary glazing, double glazing, and triple glazing. Each has distinct benefits and price points:

Glazing Price Comparison Table

Glazing Type	Cost Per Window (Approx.)	Energy Efficiency	Noise Insulation
Secondary Glazing	£150 – £250	Moderate	High
Double Glazing	£300 – £500	High	Very High
Triple Glazing	£600 – £800	Very High	Exceptional

Secondary Glazing

This is an additional layer of glass installed inside the original sash window. It enhances insulation and soundproofing while preserving the window’s original appearance. 

Secondary glazing is generally the most cost-effective option and is perfect for historic or conservation-area properties.

Double Glazing

Double-glazed sash windows feature two layers of glass with a space in between that improves thermal efficiency and noise reduction. These windows are more expensive than secondary glazing but offer better insulation and security. 

Double glazing is ideal for homeowners looking to improve energy efficiency.

Triple Glazing

Triple-glazed sash windows have three layers of glass, providing the highest levels of insulation, noise reduction, and security. 

These windows are the most expensive option but are perfect for homes in areas with extreme weather conditions or those seeking the utmost energy efficiency.

Installation Complexity

The complexity of installation can also influence the price of sash windows. If your property is listed or located in a conservation area, you may require specialist sash window installation services. 

The installation process for traditional timber sash windows can be more time-consuming due to the need for precise measurements and fitting. uPVC and aluminum frames are generally easier and quicker to install, resulting in lower labor costs.

Window Size and Design

The size of your sash windows plays a role in the pricing. Larger windows or those with intricate designs, such as multi-pane configurations or bay windows, require more materials and labor to manufacture and install. 

Custom-made sash windows will also add to the cost compared to off-the-shelf options.

Energy Efficiency and Performance

Sash windows that are specifically designed for energy efficiency may cost more upfront but can save money in the long run by reducing energy bills. 

For instance, low-emissivity (Low-E) glass, which reflects heat back into the room, enhances the thermal performance of double and triple glazing, making it a popular choice for eco-conscious homeowners.

Astragal Bars vs Georgian Bars

When choosing sash windows, the design of the bars dividing the panes of glass, Astragal and Georgian bars can also impact both the aesthetics and the cost.

Astragal Bars

These are traditionally placed on the outside of the window and are part of the window’s design. They give the window a distinctive period look, often seen in Victorian sash windows. 

Astragal bars can be made from wood, metal, or uPVC, depending on the frame material. They are typically more expensive because they are handcrafted and offer a more authentic appearance.

Georgian Bars

These are generally part of the glazing itself, positioned between the panes of glass in double or triple glazing. Georgian bars are often more affordable than astragal bars, as they are typically embedded within the glazing, requiring less detailed craftsmanship. 

These bars are common in homes aiming for a Georgian-style aesthetic or those seeking a more modern approach to traditional design.

Location

The cost of sash windows can vary significantly depending on where you live in the UK. While the material, size, and glazing options are the primary factors, location plays an essential role in influencing the price. Here’s why:

In areas where demand for sash windows is higher, such as London or the South East, prices tend to be higher. This is due to increased competition among homeowners and landlords wanting to preserve the traditional look of their properties or add value to their homes. 

As a result, installers in these regions may charge more to meet this demand, as well as to cover higher operational costs.

While sash windows are manufactured across the UK, transporting the materials to certain areas can affect the price. Sash window suppliers in more remote or rural areas may face higher transportation costs, which in turn impacts the price passed on to the customer. On the other hand, locations closer to manufacturing hubs (such as Birmingham, Manchester, or London) may benefit from lower transportation costs, keeping prices relatively lower.

Optional Extras

The colour, finish, and foil options you choose for your sash windows can impact the cost. Custom colours, premium finishes like satin or gloss, and foil wraps add to the material cost and require additional labour, making these choices more expensive than standard white or natural wood finishes.

If you’re considering sash window arches, they can add an extra £400-£600 per window due to the complexity of the design and additional materials required. 
Similarly, intricate internal finishes like decorative timber architraves or bespoke mouldings will also increase the overall cost, as they require more skilled craftsmanship and higher-quality materials.

Sash Window Replacement vs. Restoration – Which Is More Cost-Effective?

When deciding between sash window replacement and restoration, the most cost-effective option depends on the condition of your existing windows.

Restoration

If your sash windows are in decent shape but have minor issues, such as drafty seals, damaged glass, or worn-out cords, repair can be a budget-friendly solution. 

Draught-proofing or replacing the glass panes can significantly improve efficiency without the need for a full replacement. Typical repair costs range from £200 to £500 per window for draught-proofing or glass replacement, making this a cost-effective choice for windows that still have good frames.

Replacement

However, if your windows have extensive damage, such as rotted frames or structural issues, a full replacement may be necessary. Replacing old windows with new, energy-efficient sash windows will improve your home’s thermal performance and add value, but it is more expensive. 

The cost of new sash windows ranges from £600 to £5,000 depending on material and size.

Are Sash Windows Worth the Investment?

When considering whether sash windows are a worthwhile investment for your home, it’s essential to weigh the initial cost against the long-term benefits. 

Below, we explore the advantages of sash windows that make them a smart choice for homeowners, landlords, and property investors in the UK.

Enhanced Aesthetic Appeal

Sash windows are synonymous with timeless charm and period character, adding kerb appeal to both traditional and modern properties. The visual appeal often increases the property value, making it a desirable feature for prospective buyers or renters.

Improved Energy Efficiency

Investing in double glazed sash windows or triple glazing significantly improves your home’s energy efficiency. With better insulation, these windows help to reduce heat loss and draughts, which can lower your heating bills and improve comfort. 

Energy-efficient sash windows are particularly beneficial in older properties, where traditional windows may not meet modern insulation standards. The long-term savings on energy costs can make sash windows a wise financial choice.

Low Maintenance and Durability

Modern uPVC sash windows are designed to be low maintenance compared to traditional wooden windows, which often require painting and upkeep. Durable materials such as aluminium also offer long-lasting performance without the need for frequent repairs. 

Additionally, high-quality glazing options like double glazing or triple glazing can provide added protection against the elements, enhancing the durability of your windows.

Better Security

Sash windows can be fitted with modern security features, such as multi-locking systems and reinforced glass, providing peace of mind. Upgrading your windows to more secure options helps protect your property from break-ins and criminal activity. 

Ensuring your sash windows are both functional and secure offers increased safety for you and your family.

Long-Term Value

Though sash window replacement may have a higher upfront cost, the long-term value they add to your home can outweigh the initial investment. 

Whether you are enhancing your own living experience or increasing the value of a property for resale or rent, investing in high-quality sash windows can provide a return in terms of property appreciation and tenant attraction.

Get a Free Quote for Your Sash Windows Today!

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Get your personalised sash window quote today! Contact us now to find the best price for your new sash windows.

FAQs

Is there a cheaper alternative to sash windows?

Yes, there are more affordable alternatives to sash windows, such as casement windows or uPVC double-glazed windows. 

While these options may not have the same aesthetic appeal or traditional charm as sash windows, they can still offer good energy efficiency and are typically lower in cost. uPVC windows, in particular, are a cost-effective choice and require less maintenance than timber sash windows.

Do you need planning permission for sash windows?

Whether you need planning permission for sash windows depends on the property type and location. If your property is a listed building or located in a conservation area, you may need approval before installing new sash windows. 

For most standard homes, replacing existing windows with like-for-like sash windows does not require planning permission. However, it’s always best to check with your local council before proceeding to ensure compliance with local regulations.

Are sash windows energy efficient?

Yes, sash windows can be energy-efficient, especially when fitted with double glazing or triple glazing. Double glazed sash windows significantly reduce heat loss, improve insulation, and minimise draughts, which helps to keep homes warmer in the winter and cooler in the summer. 

Additionally, upgraded timber sash windows with modern seals can provide better energy efficiency compared to older, single-glazed models.

Can you put sash windows in any house?

Sash windows can be installed in most homes, but there are some considerations. They are particularly popular in period properties and homes with a traditional aesthetic. However, sash windows can also be added to modern homes for a touch of classic style. 

When installing sash windows, it’s important to ensure they are the right size for the opening and comply with building regulations. If you live in a listed building or a conservation area, specific permissions may be required.