how much does it cost to add a velux window

Velux Window Cost: How Much to Add One

By Matthew WilsonMarch 12, 2026

Installing a Velux window, a popular choice for loft conversions and extensions, can significantly enhance your living space and natural light intake. But how much does it cost to add a Velux window? Let's delve into the factors influencing the price and provide a comprehensive guide to help you budget for this home improvement project.

Before we dive into the costs, it's essential to understand that Velux windows come in various sizes, styles, and features. The price can vary greatly depending on these factors, as well as your location and the complexity of the installation.

Factors Affecting Velux Window Cost

The cost of adding a Velux window is influenced by several factors. Understanding these can help you make informed decisions and prepare a realistic budget.

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Velux Windows Prices: 2026 Installation Cost Comparison

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1. **Window Size and Style**: Velux windows are available in different sizes and styles, including center pivot, top hung, and conservation roofline. Larger windows and those with specific styles or features will naturally cost more.

Window Size

Velux windows range from 450mm to 1600mm in width and 600mm to 1500mm in length. The most common sizes are around 780mm x 1100mm, which typically fall within the mid-range of pricing.

2. **Glazing Options**: Velux offers various glazing options, including double and triple glazing, with different U-values and energy efficiency ratings. Higher-quality glazing options will increase the cost.

Glazing Types

Standard double glazing is the most affordable option, while triple glazing and specialized glazing types, such as Velux's Active and Integra glazing, come at a premium.

3. **Installation Complexity**: The complexity of the installation can significantly impact the cost. Factors include the roof type, pitch, and accessibility, as well as any additional work required, such as strengthening the roof structure or making structural changes.

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Average Velux Window Costs

Now that we've explored the factors influencing the cost, let's look at some average Velux window prices to give you a rough idea of what to expect.

Prices are inclusive of the window unit and installation, and they can vary depending on your location and the specific installer. Always obtain multiple quotes to ensure you're getting the best deal.

Window Unit Costs

Here are some average Velux window unit costs, excluding installation:

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Standard double glazed window: £200 - £400
Triple glazed window: £350 - £600
Specialized glazing (e.g., Active, Integra): £450 - £800

Installation Costs

Installation costs can vary widely depending on the complexity of the job. Here are some average installation costs:

Simple installation (e.g., flat roof, easy access): £150 - £300
Complex installation (e.g., pitched roof, difficult access): £300 - £600

Considering these factors, the total cost of adding a Velux window can range from around £400 to £1,500, with most installations falling between £600 and £1,200. Keep in mind that these are rough estimates, and the actual cost may vary.

Additional Costs to Consider

Before you finalize your budget, consider these additional costs that may apply to your project:

1. **Roof Alterations**: If your roof needs strengthening or structural changes, you may need to factor in additional costs for a structural engineer and any necessary building work.

2. **Building Regulations and Planning Permission**: In some cases, you may need to obtain planning permission or ensure your installation complies with building regulations. These processes may incur additional fees.

3. **VAT**: If you're hiring a professional installer, VAT will be added to the cost. The current standard rate of VAT in the UK is 20%.

In conclusion, the cost of adding a Velux window can vary significantly depending on various factors. By understanding these factors and obtaining multiple quotes, you can make an informed decision and budget accordingly for your home improvement project. Don't forget to consider additional costs and potential savings, such as improved energy efficiency, when making your final decision.