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Double glazing costs: 2024 updated double glazed windows prices

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The cost of double glazing a typical three-bedroom home is £4,500

Double glazing prices are an average of £525 per casement window

The style, frame material and glass type will be reflected in the total cost of your double glazing

For homeowners seeking to take advantage of the long-term benefits of double glazing, including reduced heating bills and improved home security, understanding window costs is pivotal. The initial investment can be around £4,500 for a typical three-bedroom property, but this might fluctuate depending on opening style and frame material. There are also several window grants available for low-income households to reduce costs.

We delve into how to get the best deal on double glazing prices below, including what prices you should expect, what to look for in a quote, and how to compare quotes from different suppliers.

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How much does double glazing cost in the UK?

For a typical property with three bedrooms, installing uPVC double glazing for every window costs around £4,500. However, any quotes you receive are dictated by the window style and size, frame material, and glass type chosen. The number of windows is also a factor, with many installers offering discounts for multiple upgrades. 

The table below shows the approximate costs of double glazed windows for different types of houses, taking the quantity and frame material into account.

Type of three-bed propertyNumber of casement windowsuPVCAluminiumTimber
Flat4£2,108£3,200£4,800
Terrace7£3,689£5,600£8,400
Semi-detached10£4,500£8,000£12,000
Detached15£7,500£12,000£18,000

Frame material

Although there are plenty of factors that will affect the exact cost of your new double glazed windows, the below table is what the average UK homeowner can expect to pay for each window material.

Window materialAverage cost for a casement window
uPVC£525
Aluminium£800
Timber£1,200

Typically, unplasticised polyvinyl chloride (uPVC) frames are the most cost-effective option. They’re durable, require minimal maintenance, and offer good thermal performance, making them a popular choice.

Aluminium windows tend to be pricier than uPVC. They are strong and require little maintenance but are not as insulating as wood or uPVC. However, they can be a good option for oversized windows that require more structural support.

Composite frames, which are made from a blend of materials – often timber with uPVC – vary in price depending on the specific components used. They’re designed to provide the benefits of both materials. For example, timber and uPVC composite frames offer the aesthetic appeal of natural wood, with lower maintenance requirements and good insulation provided by uPVC. 

Wooden window frames are typically the most expensive option. They offer excellent insulation and a classic aesthetic that many people love, but they require more maintenance to prevent issues, such as rot and insect damage.

Window style

The style or type of window can notably impact its cost. Different styles have varying levels of complexity in terms of manufacturing and installation, which influence their prices.

Fixed windows, which don’t open, and casement windows, which only open from a single point – usually the side – are typically the simplest and, thus, often the least expensive options. Casements can also include the popular awning window design, which is hinged at the top and opens outwards, creating an overhang. Sliding sash or tilt-and-turn designs, which require more moving parts to allow them to open and close, tend to come with a higher price tag. 

Specialised architectural window styles, such as bay or bow windows are typically more expensive. These designs project out from the home’s exterior and consist of multiple units, which adds to their cost. Custom frames – for example unusually large or non-standard shapes – can also be more costly. The additional design and manufacturing work required for these windows can significantly increase their price.

Window size

Simply put, larger windows are generally more expensive than smaller ones. This is because larger windows require more materials for the frame and glass, resulting in higher manufacturing costs.

Additionally, installing larger windows can be more complex and time-consuming than smaller ones, leading to higher labour costs. For instance, more expansive windows might require more people for the installation, due to the size and weight of the windows, or structural modifications could be needed to accommodate them, especially if you’re enlarging an existing window opening.

Type of glass

Standard clear glass is typically the least expensive option, but there are several types of specialised glass that can increase the cost due to their added benefits.

Low-emissivity (Low-E) glass is coated with a transparent, microscopic layer that reflects heat. This improves the window’s insulation, helping to keep your home cooler in the summer and warmer in the winter, but it generally costs more than standard glass.

Toughened or tempered glass, which is stronger and safer than regular glass, is another more expensive option. If broken, it shatters into small, blunt pieces instead of large, sharp shards, reducing the risk of injury.

Laminated glass has a layer of plastic between two panes of glass, making it highly resistant to breakage. It also provides additional benefits such as noise reduction and UV protection, but these advantages come at a price. 

Number of windows

Naturally, the number of windows you are installing or replacing directly affects the project’s total cost.

However, it’s important to note that while the total price increases, there can sometimes be cost efficiencies when installing multiple windows simultaneously. For instance, labour costs may not increase linearly, as installers are already on site and have their equipment set up, so the additional time to install more windows may be less significant. This means the cost per window could decrease with a larger project.

Some double glazing companies or suppliers also offer discounts for larger orders, so the per-window cost might be lower if you buy many windows at once. However, potential discounts vary greatly and depend on the specific supplier or contractor.

The table below shows the average prices for uPVC, aluminium and timber frames in a range of window designs.

Window style and material600mm x 900mm900mmm x 1,200mm1,200mm x 1,200mm
uPVC casement£500£580£620
uPVC sash£500£580N/A
uPVC tilt and turn£600£695£750
Aluminium casement£800 – £1,000£950 – £1,150£1,200 – £1,250
Timber casement£1,500£1,700£1,850
Timber sash£1,500 – £1,700£1,700 – £1,900N/A

How much do double glazed windows cost for a house?

Deciding whether or not to replace all the windows in your home will impact the final cost, and it’s well worth considering if every window needs to be upgraded. If your windows are old or in poor condition, it would make sense to replace all of them at once. For instance, windows that don’t operate properly can pose a safety risk in an emergency.

However, if only some are impaired, you might replace only those particular ones. It’s not uncommon, for example, for windows on certain sides of a house to experience more wear and tear due to weather exposure. This could lead to them being less energy efficient and increasing household bills. 

Triple glazing, while costing 10 to 20 per cent more than double, may benefit properties in colder climates (for instance, in the north of the country or Scotland) offering increased insulation. Some suppliers give free or discounted upgrades to triple glazing if you get a quote for double.

What is the cost of double glazing a three-bed house?

Several variables influence the cost of double glazing a three-bedroom house in the UK.

The number of windows to be replaced is a primary consideration. You may decide not every window needs replacing, although some suppliers offer discounts on a full set of windows.

Equally important are the size and style of the windows required. Many homeowners choose more visually appealing styles for the front of the property while saving the less expensive options, such as casement, for the rear windows. Other factors that impact the double glazing cost are the choice between a local or national window supplier and whether the installation poses a challenge.

Is double glazing worth the cost?

Double glazing is a valuable investment, thanks to its extensive benefits.

  • Enhanced insulation: Double glazed windows, filled with air or argon gas, effectively retain heat during winter and keep interiors cooler in summer. Low-E glass further boosts efficiency by reflecting heat
  • Energy savings: The improved insulation results in lower heating and cooling costs, leading to significant savings over time
  • Increased security: Double glazing is more resistant to breakages, enhancing protection against break-ins. Options – like toughened and laminated glass, especially on lower floors, and multi-point locking systems – increase security further
  • Noise reduction: Double glazing significantly cuts down outdoor noise, with reductions of up to 44 decibels with acoustic laminated glass
  • Less condensation: The airtight seal of double glazing reduces indoor condensation, preventing structural damage and mould
  • Lower carbon footprint: By reducing energy usage, double glazing also cuts CO2 emissions, especially with A++ rated windows, potentially reducing CO2 by 410kg per year, equivalent to 18 per cent of a gas boiler’s annual emissions

The potential savings of up to £235 annually ensure a rewarding return on investment, as this table shows.

MaterialAverage cost of double glazing a three-bed propertyAverage payback period
uPVC£4,50019 years
Aluminium£8,00025 years

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Will double glazed windows prices increase?

While the cost of double glazed windows has remained relatively stable for the last few years, there are several factors that could impact prices in the future. These include:

  • Supply and demand: An increase in demand for double glazed windows could potentially drive up prices. Likewise, if there are supply shortages, this could also lead to higher prices
  • Energy prices: If energy prices rise, more people might want to install double glazed windows to save on heating costs, which could push up demand and prices
  • Economic conditions: Inflation, exchange rates, and the general state of the economy can all affect the prices of goods and services, including windows
  • Regulations and policies: For example, if the government introduces new building regulations requiring higher insulation standards or promotes energy-efficient home improvements, this could affect demand and thus prices

Top tips on how to get the best double glazing quotes

  • Shop around and source a minimum of three quotes
  • Your quote should include:
    • Full details of your window style, size, frame material, colour, and glass type
    • The number of windows you require
    • The glass energy rating 
    • Additional features, such as handles and locks
    • Labour costs
    • Start and estimated finish time
    • Disposal of your old windows
    • Warranties for installation and product guarantees
    • Company details and accreditations
  • Don’t give in to sales tactics – take your time before making any decisions
  • Be sure to check that you don’t require planning permission – this will be relevant for those living in a listed building or conservation area
  • Hire a professional installer that is local to your home. This can reduce the cost since they won’t need to waste time travelling to you
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Mark McCluggage, Director at Sheerwater Glass LTD, explained that most double glazing companies have to pay to provide insurance-backed warranties, and to register their windows with FENSA (Fenestration Self-Assessment Scheme). But once those fixed calculations are factored into the prices, there is room for flexibility, meaning that homeowners can often negotiate better quotes, without having to accept the first figure given.

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Frequently asked questions about double glazing costs

Generally, individual circumstances dictate the best time to purchase double glazing.  

Purchasing windows during the off-peak season can be financially beneficial. This is often during the colder months when demand for installations decreases, and companies frequently offer discounts to maintain consistent business. 

It’s also worth thinking about the energy cost considerations – having the installation carried out before winter allows you to benefit from the energy savings during the colder months.

Double glazing is generally considered worth the investment due to several key benefits.

First, it provides significant energy savings. Double glazing insulates your home by trapping a layer of air between the two glass panes, reducing the amount of heat that escapes during the colder months. This can drastically lower your heating bills, helping the windows to pay for themselves over time. It also improves the comfort of your home, keeping temperatures more constant, reducing drafts and cold spots in the winter, and keeping the house cooler in the summer.

Double glazing reduces noise pollution by acting as a sound barrier, dampening the noise from busy roads, airports, or noisy neighbours, thus creating a more peaceful and quiet environment within your home.

New double glazed windows also improve the aesthetic appeal of your home, increasing its attractiveness to potential buyers. The energy efficiency and noise reduction benefits are another selling point.

Double glazing and triple glazing both aim to enhance a home’s energy efficiency and comfort, but they differ in construction,performance and price. 

Double glazed windows have two glass panes separated by a gas-filled gap, reducing heat loss and external noise. Triple glazing adds an extra pane and gas layer, further improving insulation and soundproofing. While three panes offer superior energy savings, particularly in colder regions, triple glazing comes at a higher cost and increased weight, which may require stronger frames.

When negotiating with a double glazing salesman, clearly articulate your requirements and budget constraints, showing you’re informed and serious. 

  • Don’t hesitate to ask for discounts or promotions that could reduce costs
  • Highlight quotes from competitors, but be respectful and realistic in your approach
  • Remember, salesmen often have wiggle room on price, especially if they’re keen to meet sales targets 
  • Finally, be prepared to walk away if the deal doesn’t meet your expectations, as this can sometimes prompt better offers
Windows cost calculator

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This calculator works using pricing data sourced directly from UK windows manufacturers. Prices are subject to fluctuations, however, so please use the results as a guide and contact suppliers for an exact price for your property.

Katharine Allison

Energy Saving Writer

As Independent Advisor’s energy saving expert, Katharine, a keen advocate for sustainability, is an authority on solar panels, double glazing, and cutting-edge renewable energy technologies. Her dedication merges with a commitment to enlighten and steer readers toward embracing eco-friendly solutions and the latest trends in sustainability.

With over 10 years of experience, she has worked with some of the UK’s leading companies and publications, including the Federation of Master Builders, Architectural Digest, and Denon Construction. 

Katharine is particularly passionate about consumer causes and animal welfare and has art, philosophy, and psychology degrees. She lives with her sled dogs in East Sussex.

Amy Reeves

Editor

Amy is a seasoned writer and editor with a special interest in home design, sustainable technology and green building methods.

She has interviewed hundreds of self-builders, extenders and renovators about their journeys towards individual, well-considered homes, as well as architects and industry experts during her five years working as Assistant Editor at Homebuilding & Renovating, part of Future plc.

Amy’s work covers topics ranging from home, interior and garden design to DIY step-by-steps, planning permission and build costs, and has been published in Period Living, Real Homes, and 25 Beautiful Homes, Homes and Gardens.

Now an Editor at the Independent Advisor, Amy manages homes-related content for the site, including solar panels, combi boilers, and windows.

Her passion for saving tired and inefficient homes also extends to her own life; Amy completed a renovation of a mid-century house in 2022 and is about to embark on an energy-efficient overhaul of a 1800s cottage in Somerset.

Mark McCluggage square

Mark McCluggage

Director at Sheerwater Glass Ltd

Mark has been a Director at Surrey-based Sheerwater Glass Ltd for over 12 years, making him highly qualified to offer advice on new windows and double glazing. Prior to this, Mark was a Countermeasures Operator in the British Army for nearly five years before forming his company, Solar Panelling Ltd.