Understanding the Price of Double-Glazed Windows

Double-glazed windows are a popular home improvement for homeowners across the UK, and for good reason. They help improve energy efficiency, reduce outside noise, and keep your home warm during winter while staying cooler in summer. Plus, upgrading to double glazing can enhance your property’s appearance and add value to your home.

However, if you’re considering replacing your windows, one of the biggest questions is: how much does it cost? The answer depends on several factors, including the window material, style, glazing type, and installation complexity. Whether you’re upgrading an entire house or tackling just a few problem windows, understanding these costs can help you plan your budget effectively and make the right decisions for your property.

In this guide, we’ll break down the factors that influence the price of double-glazed windows, average costs in the UK, and tips for saving money on your project. If you’re also looking to brighten up your home and maximise natural light, you might find inspiration in our guide on Maximising Natural Light for a More Inviting Home.

Let’s explore how much you can expect to invest in double-glazed windows and why they’re a worthwhile upgrade for comfort, energy savings, and long-term value.

Key Factors That Influence the Cost of Double-Glazed Windows

The cost of double-glazed windows can vary significantly depending on several key factors. From the material of the frames to the complexity of the installation, understanding what drives the price can help you make informed decisions and plan your budget. Let’s take a closer look at the main elements that influence the overall cost.

1. Window Material

The material of your window frames is one of the biggest cost factors. Different materials offer varying levels of durability, energy efficiency, and aesthetic appeal, which are reflected in their prices:

• uPVC Windows: The most popular and affordable option. uPVC (unplasticised polyvinyl chloride) windows are low-maintenance, durable, and energy-efficient. Expect to pay between £250–£600 per window, depending on the size and style.
• Aluminium Windows: Sleek, modern, and extremely durable, aluminium frames are perfect for contemporary homes. However, they come at a higher price, typically costing £500–£1,200 per window.
• Timber Windows: Timber frames offer a classic, traditional look that’s ideal for period properties. They are beautiful but require more maintenance and come with a premium price tag, ranging from £800–£1,500 per window.

Choosing the right material depends on your budget, property style, and long-term maintenance goals. While uPVC is the most cost-effective, timber or aluminium can be worth the investment for aesthetics and longevity.

2. Window Style

The style of window you choose will also impact the price. Some designs are more complex to manufacture and install, which increases costs:

• Casement Windows: The most common and affordable style, casement windows open outward like a door. Prices range from £250–£600 per window.
• Sash Windows: Ideal for traditional homes, sash windows slide vertically and require more craftsmanship, costing between £700–£1,500 per window.
• Tilt-and-Turn Windows: Offering flexibility, these windows tilt open for ventilation or swing fully open for easy cleaning. Expect to pay £400–£900 per window.
• Bay Windows: A larger, feature-style window that adds charm and space but comes with a higher cost, typically £1,500–£3,000.

Smaller windows, like those used in bathrooms, will naturally cost less, while larger or custom-shaped windows increase the price due to the added material and labour involved.

3. Glazing Options

Not all double glazing is created equal. The type of glazing you choose will affect the overall price, energy efficiency, and comfort of your home:

• Standard Double Glazing: This consists of two panes of glass with an air gap to reduce heat loss. It’s the most affordable option, costing £250–£600 per window.
• Low-Emissivity (Low-E) Glass: Designed to reflect heat back into the room while allowing sunlight in, Low-E glass can cost 10–20% more than standard double glazing.
• Triple Glazing: For superior energy efficiency and soundproofing, triple glazing adds a third pane of glass, increasing costs to £500–£1,500 per window.

While triple glazing costs more upfront, it may be worth considering for homes in colder climates or noisy areas where extra insulation and soundproofing are essential.

4. Installation Requirements

The complexity of installing double-glazed windows can significantly affect the final cost. Factors that impact installation include:

• Property Type: Installing windows in older homes or listed buildings may require specialist skills and permissions, increasing labour costs.
• Access: If your home has hard-to-reach areas (like upper floors or awkward spaces), scaffolding or cherry pickers may be required, adding £300–£1,000 to the total price.
• Number of Windows: Larger projects can sometimes benefit from bulk discounts, so replacing all your windows at once could save money in the long run.

Hiring experienced professionals ensures the job is done safely and to a high standard. Poorly installed windows can lead to draughts, condensation, and costly repairs later on, so it’s worth getting it right the first time.

Why These Factors Matter

Understanding the factors that influence the price of double-glazed windows will help you make informed decisions that suit your needs and budget. Whether you opt for cost-effective uPVC casement windows or premium timber sash windows, the key is balancing your priorities for energy efficiency, aesthetics, and maintenance.

Average Costs of Double-Glazed Windows in the UK

To help you plan your budget more effectively, we’ve broken down the average costs of double-glazed windows based on frame materials, window styles, and glazing options. Whether you’re working on a tight budget or looking for a premium upgrade, this guide will give you a clear picture of what to expect when investing in new windows for your home.

1. uPVC Double-Glazed Windows

uPVC (unplasticised polyvinyl chloride) windows are the most common choice for homeowners across the UK, thanks to their affordability, durability, and low-maintenance properties. They’re ideal for modern homes and offer great energy efficiency without breaking the bank:

• Casement Windows: £250–£600 per window.
• Sash Windows: £700–£1,000 per window.
• Tilt-and-Turn Windows: £400–£800 per window.

Average Cost for a Standard 3-Bedroom House: Replacing all the windows with uPVC double glazing costs approximately £4,500–£7,000, depending on the number and style of windows.

2. Aluminium Double-Glazed Windows

Aluminium windows are a sleek, modern option that’s particularly popular for contemporary homes. They’re extremely durable, weather-resistant, and allow for slimmer frames, which let in more natural light. However, they come at a higher price point:

• Casement Windows: £500–£1,000 per window.
• Sash Windows: £900–£1,500 per window.
• Tilt-and-Turn Windows: £600–£1,200 per window.

Average Cost for a Standard 3-Bedroom House: Replacing all windows with aluminium double glazing costs around £8,000–£12,000.

3. Timber Double-Glazed Windows

Timber windows are perfect for period homes or listed buildings where maintaining a traditional look is essential. They offer natural beauty and excellent insulation, but they require more maintenance and come with a premium price:

• Casement Windows: £800–£1,200 per window.
• Sash Windows: £1,000–£1,500 per window.
• Tilt-and-Turn Windows: £900–£1,400 per window.

Average Cost for a Standard 3-Bedroom House: Fully replacing windows with timber frames can cost anywhere between £10,000–£15,000.

4. Triple Glazing vs. Double Glazing

While double glazing is sufficient for most homes, triple glazing is an option for homeowners looking for maximum energy efficiency, noise reduction, and comfort—particularly in colder climates or noisy areas:

• Standard Double-Glazing Costs: £250–£1,200 per window, depending on material and style.
• Triple Glazing Costs: £400–£1,500 per window, roughly 20–30% more expensive than double glazing.

For most homes, double glazing offers excellent value for money. However, if your home experiences extreme weather conditions or noise, triple glazing may be worth the extra investment.

Average Cost Summary Table

To give you a quick overview, here’s a cost breakdown based on frame materials and window styles:

Window Type	uPVC	Aluminium	Timber
Casement	£250–£600	£500–£1,000	£800–£1,200
Sash	£700–£1,000	£900–£1,500	£1,000–£1,500
Tilt-and-Turn	£400–£800	£600–£1,200	£900–£1,400

How Many Windows Are in a Typical Home?

The number of windows you need to replace will naturally influence the total cost. On average:

• Small Homes: 5–8 windows, costing £2,500–£6,000 for uPVC.
• Standard 3-Bedroom Homes: 10–15 windows, costing £4,500–£12,000 depending on material and style.
• Larger Homes: 15–20+ windows, with costs exceeding £15,000 for premium options like timber or aluminium.

Why Prices Vary

As you can see, costs vary depending on window material, style, and features like energy-efficient glazing. Other factors, such as your location, labour rates, and property type, also play a role. If your budget is tight, prioritise replacing the most worn or inefficient windows first and gradually upgrade over time.

Additional Costs to Consider

When planning to install double-glazed windows, it’s important to think beyond the windows themselves. There are often additional costs that can creep into your budget, especially if repairs or upgrades are needed before installation. Understanding these extras will help you avoid surprises and ensure your project runs smoothly. Let’s take a closer look:

1. Replacing Damaged Frames

Before fitting new double-glazed windows, the existing window frames must be in good condition. If your frames are damaged, rotting, or poorly insulated, they’ll need to be repaired or replaced:

• Minor Frame Repairs: Small fixes using wood filler or patching damaged areas typically cost £50–£150 per frame.
• Replacing Entire Frames: If the damage is extensive, you may need new window frames, adding £150–£400 per frame for uPVC or £500–£1,000 for timber.

It’s always better to address these issues upfront to avoid complications during installation. For older homes, this is particularly important, as damaged frames can lead to draughts and poor insulation.

2. Draught-Proofing Existing Windows

If replacing all your windows at once isn’t feasible due to budget constraints, draught-proofing your existing windows can be a more affordable option to improve comfort and energy efficiency:

• Self-Adhesive Draught Strips: A DIY-friendly option costing £10–£30 per window.
• Professional Draught-Proofing: Hiring a specialist to seal gaps around window frames costs between £200–£400 for an average home.

While draught-proofing won’t replace the benefits of double glazing, it can provide temporary relief from heat loss and reduce energy bills. Learn more about this in our guide on How to Draught-Proof Your Windows and Doors.

3. Treating Damp and Condensation Issues

Replacing windows won’t solve underlying damp or condensation problems in your home. In fact, if damp isn’t treated beforehand, it can damage your new windows over time. Common issues to address include:

• Penetrating Damp: Caused by water seeping through walls, this can cost £500–£2,000 to repair, depending on the extent of the damage.
• Condensation Solutions: Upgrading ventilation systems or using dehumidifiers can cost between £100–£1,000.
• Mould Treatment: Cleaning and treating walls to remove mould costs around £200–£500.

Addressing these issues before installation ensures your investment in double glazing is protected. If you’re dealing with persistent damp, take a look at our Expert Advice on Dealing with Damp and Mould for practical solutions.

4. Custom Window Designs

While standard double-glazed windows are more affordable, custom designs or shapes can increase the price. Specialised options include:

• Shaped Windows: Arched, circular, or triangular windows can add £200–£500 per window.
• Coloured Frames: Custom colours or finishes, like anthracite grey or woodgrain effects, add 10–20% to the overall cost.
• Stained or Decorative Glass: Unique glass designs can add £100–£500 per window.

If your property has a specific aesthetic or you’re looking to add a unique touch, it’s worth factoring these customisations into your budget.

5. Disposal of Old Windows

Don’t forget about the cost of removing and disposing of your old windows. While many installers include this service in their quote, others may charge extra:

• Standard Disposal: Expect to pay around £50–£150 for removal and waste disposal.
• Recycling Fees: Some companies offer eco-friendly disposal, which may cost slightly more.

Always confirm whether disposal is included in your quote to avoid unexpected charges.

6. Upgrading to Triple Glazing

If energy efficiency is a top priority, upgrading to triple glazing could be worth considering. While it costs around 20–30% more than double glazing, the long-term benefits include:

• Better thermal insulation, reducing energy bills.
• Improved noise reduction, ideal for homes near busy roads or airports.
• Increased comfort during extreme weather conditions.

If you’re unsure whether triple glazing is worth the additional cost, speak to a professional installer who can advise based on your home’s location and insulation needs.

7. Scaffolding or Access Equipment

For upper floors or hard-to-reach areas, scaffolding or cherry pickers may be required, adding an extra £300–£1,000 to your project. If this is necessary, it’s often more cost-effective to replace multiple windows at the same time to make the most of the equipment hire.

Plan for Success

While replacing your windows involves upfront costs, taking the time to factor in these additional expenses will ensure your project stays on track. Whether you’re addressing damp issues, upgrading your frames, or opting for custom designs, being prepared will help you avoid surprises and make the most of your investment.

Tips for Saving Money on Double-Glazed Windows

Replacing your windows is a big investment, but there are plenty of ways to keep costs under control without sacrificing quality. By planning carefully, comparing your options, and making smart decisions, you can save money while ensuring your home gets the energy-efficient upgrade it deserves. Here are our top tips to help you maximise value when installing double-glazed windows.

1. Compare Multiple Quotes

One of the simplest and most effective ways to save money is to compare quotes from multiple window installers. Prices can vary significantly, so getting at least three detailed quotes will give you a clearer idea of what’s fair for your project. Look for quotes that include:

• Labour costs and materials
• Window disposal fees
• Any additional costs, like scaffolding or repairs

At BookaBuilderUK, you can easily connect with trusted professionals in your area, compare quotes, and check reviews to make an informed decision. Choosing experienced installers ensures you avoid poor workmanship that could cost you more in the long run.

2. Opt for uPVC Windows

If you’re working with a tight budget, uPVC frames are the most cost-effective option. They’re durable, energy-efficient, and require minimal maintenance, making them perfect for most homes. While timber or aluminium frames may look more premium, uPVC offers excellent value for money at a fraction of the price:

• uPVC Casement Windows: £250–£600 per window
• Timber Casement Windows: £800–£1,200 per window

For homeowners looking for a middle ground, coloured or wood-effect uPVC frames can offer the aesthetic appeal of timber without the premium price or upkeep.

3. Replace All Windows at Once

While it might seem counterintuitive, replacing all your windows at once can actually save you money in the long run. Many window installers offer bulk discounts for larger jobs, which can reduce the overall cost per window:

• Fewer visits mean reduced labour costs.
• Scaffolding hire (if needed) only has to be paid for once.

Not only is it more cost-effective, but upgrading all your windows at once will also ensure a consistent look and performance across your home.

4. Choose Standard Window Sizes and Styles

Custom windows, like bay or shaped designs, look stunning but come with a hefty price tag. If you’re looking to save money, opt for standard window sizes and styles, such as:

• Casement Windows: Simple, versatile, and budget-friendly.
• Tilt-and-Turn Windows: Offer functionality at a mid-range price.

Keeping your choices simple will reduce both material and installation costs while still giving your home a fresh, modern look.

5. Plan Your Project During Off-Peak Seasons

Window installers are busiest during the spring and summer months when the weather is ideal for home improvement projects. To save money, consider scheduling your window replacement during quieter seasons, such as autumn or winter:

• Many installers offer discounts to secure work during slower months.
• With fewer bookings, you’re more likely to find tradespeople available at short notice.

As long as the weather is dry and not freezing, double-glazing installation can be completed effectively during the cooler months.

6. Check for Energy Efficiency Grants

Depending on where you live, you may be eligible for government grants or incentives to help offset the cost of installing energy-efficient double-glazed windows. Programs such as the Energy Company Obligation (ECO) scheme can provide financial assistance for eligible homeowners.

Research available grants or speak to your installer, as they may be able to advise you on local funding opportunities.

7. Prioritise High-Impact Areas First

If your budget doesn’t allow for a full replacement right now, focus on the windows that will have the biggest impact on your home’s comfort and energy efficiency:

• Rooms with the most draughts or condensation.
• South-facing rooms where heat loss is more noticeable.
• Windows in high-traffic areas, like living rooms or bedrooms, where comfort matters most.

You can always replace the remaining windows in stages as your budget allows.

8. Maintain Your Windows Regularly

Once your new double-glazed windows are installed, regular maintenance will help you protect your investment and delay the need for repairs or replacements:

• Clean your windows and frames regularly to prevent dirt buildup.
• Inspect seals and hinges annually to ensure they’re intact and functioning properly.
• Keep ventilation in check to avoid condensation forming between panes.

Simple upkeep will extend the lifespan of your windows and save you money on potential repairs.

Make Your Budget Go Further

Replacing your windows is an investment that pays off in comfort, energy savings, and home value. By comparing quotes, choosing cost-effective options like uPVC frames, and timing your project wisely, you can achieve the benefits of double-glazing without overspending.

If you’re planning a larger home improvement project, check out our guide on Setting Realistic Goals for Your Home Makeover for tips on managing your budget effectively.

Final Thoughts on Double-Glazed Window Costs

Investing in double-glazed windows is one of the smartest home improvements you can make. Not only do they enhance comfort by keeping your home warm in winter and cool in summer, but they also improve energy efficiency, helping you save on energy bills in the long run. Beyond the practical benefits, new windows can instantly update the look of your home and even boost its market value.

While the cost of double-glazed windows varies depending on factors like material, style, and installation requirements, careful planning and budgeting can help you make the most of your investment. From opting for affordable uPVC frames to scheduling your project during quieter months, there are plenty of ways to save money without compromising on quality.

At BookaBuilderUK, we make it easy to connect with trusted window installers in your area. Whether you’re upgrading an older property, replacing draughty windows, or planning a full-scale home renovation, our platform lets you compare quotes, read reviews, and find professionals you can rely on to get the job done right.

Ready to upgrade your windows and enjoy the benefits of double glazing? Start today by finding experienced window professionals on BookaBuilderUK, and give your home the comfort, efficiency, and style it deserves!