Velux Loft Conversion Cost Calculator

A Velux loft conversion is one of the simplest and most cost-effective ways to create extra living space in your home, and this Velux loft conversion cost calculator gives you a quick estimate of how much your loft conversion project is likely to cost before you start speaking to local tradespeople.

A Velux loft conversion uses roof windows fitted into the existing roof structure of your home, which helps to keep costs down.

You will need to budget for a handful of key expenses (such as insulation, flooring, roof windows, electrics, plastering, and labour), but the total cost of your Velux loft conversion will depend on the size of the loft, the number of windows installed, and the type of finish you choose.

Velux Loft Conversion Cost Calculator

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How to Use This Velux Loft Conversion Cost Calculator

This Velux loft conversion cost calculator gives you a rough idea of how much converting an existing loft space using Velux roof windows is likely to cost. By entering a few details about your property and the project you're planning into the calculator, you can gain an insight into potential Velux loft conversion prices.

• Specification — Tell us the size of your project. Is it a small, basic conversion, or a larger conversion with a higher specification?
• Number of Windows — Choosing the number of windows you want installed also gives a better idea of the size and cost of your project.
• Staircase — Do you need a staircase installing, and if so, what sort of specification do you want this to be?
• Plastering and Insulation — Choose the level of internal plastering and insulation you need once the windows have been installed.
• Electrical Work — Select the level of electrical fit-out you need in your new loft conversion.
• Plumbing — You might want to install new heating or a bathroom, so choose the level of plumbing work that will be required.
• Flooring — Various flooring options are available for your new conversion, so choose the level you need for your project.
• Structural Roof Preparation — Velux loft conversions are generally the simplest way to convert a loft, but select if your roof will need some structural work or preparation first.
• Location — Tell us where you live so we can make adjustments for the labour rates in your area.

Factors That Affect Velux Loft Conversion Costs

Though every project is different, there are a number of factors that will affect the cost of your Velux loft conversion, such as loft size, the number of windows you want installed, and the intended use of the loft.

The calculator can help you to understand which factors have the biggest impact, making it easier for you to work out your budget, and we've provided details of the main things to keep in mind below.

Loft Size

The size of the loft is one of the main factors that affect Velux loft conversion costs. Converting larger lofts tends to require more work, which increases both material and labour costs. A bigger loft will usually need more insulation, flooring, and materials, which also increases the overall cost. Usually, the larger the loft, the higher the final project price is likely to be.

Number of Velux Windows

The number of windows you choose to install will have an impact on Velux attic conversion costs. Adding more roof windows can make the loft feel brighter and more spacious, and it's something a lot of homeowners do, but each additional window increases material and labour costs. The price of a loft conversion will include the windows themselves, along with roof modifications, installation labour, and interior finishes.

Intended Use of the Loft

How you plan to use your converted loft space can have a big impact on the overall cost, as not all projects require the same amount of work. Some spaces only need insulation, flooring, lighting, and decoration, whereas others need more complex work and more expensive finishes.

Homeowners often choose to create an extra bedroom, home office, playroom, guest room, or additional storage space out of their loft. The intended use often determines the type of fixtures, fittings, and features needed within the room. For example, projects that require extra lighting, heating upgrades, and plumbing (such as an en-suite bathroom) are likely to cost more than basic loft conversions.

Additional Features

Many homeowners choose to include extra features and upgrades as part of their Velux loft conversion, usually to improve comfort, practicality, and appearance. However, extras do usually increase the overall cost of the project. Common upgrades include en-suite bathrooms, built-in storage, bespoke staircases, additional insulation, and premium interior finishes. Some of these features require additional materials, labour, and specialist skills, and need to be budgeted for.

Regional Price Differences

It doesn't matter whether you're looking at Velux attic conversion costs or loft conversions with skylights costs. Your location is going to have an impact on the final price. This is largely due to differences in labour and construction rates across the UK.

London and the South East tend to have the highest labour costs, which makes loft conversion projects more expensive. Elsewhere, labour and material costs are usually lower, which brings the price down. Including your location helps the calculator to give a more accurate estimated cost, based on where you live.

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Why Do We Include Labour Costs?

Velux loft conversions are usually less complex than dormer or mansard loft conversions, but you'll still need to hire skilled tradespeople to carry out the work safely and correctly. A Velux loft conversion often involves a range of trades, meaning you'll likely have to seek out the skills of builders, electricians, plasterers, and carpenters, who will work together at different stages of the project. The labour costs for all of these professionals quickly add up.

Experienced tradespeople ensure roof windows are installed in a way that prevents leaks and maintains the structural integrity of the roof. They can carry out work in line with Building Regulations (especially around insulation, fire safety, and access to the space) and handle insulation, flooring, and any structural adjustments needed to make the space suitable for living.

Ready to Get a Quote?

Once you've used the calculator to determine average roof light loft conversion costs, the next step is to get bespoke quotes from local tradespeople. This will give you a better idea of actual Velux loft conversion prices based on your location and the type of work required, rather than rough estimates.

Through MyJobQuote, you can request up to three free, no-obligation quotes from loft conversion builders in your area. It's a straightforward way to compare local tradespeople, understand what's included in each quote, and find a price that works for your budget.

Getting multiple quotes is the quick and easy next step after using the Velux loft conversion calculator, helping you to choose a contractor and get the ball rolling.