How Much Does It Cost to Install a Roof Window?

When considering a full loft window conversion or simply replacing an old pane, one of the first questions homeowners often ask is: “How much will this cost?”

The actual cost of roof window installations is not a straightforward figure; it is influenced by factors such as the type and features of the window, as well as the complexity of the installation.

At LB Supplies, we offer high-quality roof windows from leading brands, including Liteleader, Velux, Dakea and Aurora. This guide outlines the costs you can expect when budgeting for your project.

1. Core Components of Roof Window Cost

The total cost of installing a roof window or skylight can be divided into two main categories: material costs (the window itself) and labour costs (installation).

A. Material Cost: The Window Unit

The cost of the window unit varies based on brand, size, material, and features. For example, the cost of Velux windows can vary significantly depending on the options selected.

Choosing a premium brand like Liteleader ensures quality, durability, and superior thermal performance, which can help reduce your energy bills over time.

B. Labour Cost: Professional Window Installation

The labour component is what most people refer to when inquiring about the cost of loft window fitters or skylight installation.

For a standard installation, such as a centre pivot or top-hung window:

• Average Installation Cost: £250-£1,000.
• Estimated Timeframe: A simple replacement or installation of a standard-size window can take as little as four to eight hours or up to one full day.
• Daily Labour Rate: Expect to pay a skilled tradesperson approximately £200 per day, plus a labourer at around £100 to £125 per day. Thus, the total daily labour cost ranges between £300 and £500.

Note on Location: Labour rates tend to be higher in London and the South East than in the Midlands, the North, Scotland, and Wales.

2. Factors That Increase Your Skylight Installation Price

To obtain an accurate estimate for your project, consider the following factors that can influence the final cost of installing loft windows:

Factor 1: Complexity of the Project

• New Opening (Highest Cost): If you need to create a new opening in the roof structure, costs will be higher due to the required structural work (e.g., trimming rafters, plastering), potentially adding £500 to £2,000 to the bill.
• Like-for-Like Replacement (Lowest Cost): Replacing an existing window with a new one of the same size incurs minimal labour costs (approximately £150-£250).

Factor 2: Structural Alterations and Access

• Roof Type: Installing on a tiled roof is generally more straightforward than on a slate roof, which demands more careful handling.
• Scaffolding: If the roof is high or difficult to access, budget an additional £300-£500 for scaffolding hire.

Factor 3: Window Features

The cost increases with advanced technology options:

• Glazing Options: Standard double glazing is the least expensive. Upgrading to triple glazing, noise reduction glass, or extra low-energy glass can significantly raise the supply cost.
• Operation: Manual operation is standard, while electric or solar-powered options (e.g., Velux Integra) offer remote control and convenience but at a higher price.
• Additional Accessories: Adding blinds, opening poles and window motors can make your roof window unique but may also increase your installation cost by up to £300+.

Factor 4: Additional Materials (Flashings)

All window installations require flashing kits to ensure a watertight seal with the roof. Flashing kits can add around £80 to £450 to the supply price.

Final Cost Estimate Summary

While every project is unique, this guide provides a general overview of the total installed roof window cost in the UK, including both the window and labour costs.

For the most accurate assessment of your specific window installation requirements and roof window costs, it is always advisable to consult experienced loft window fitters.

If you’re ready to start your roof window project, visit our roof windows page now to explore the full range of Liteleader, Velux, Dakea, and Aurora products, or contact our team for expert advice on selecting the right window for your budget.