When you add a loft conversion or build a new extension, natural light becomes a priority. A well placed roof window can transform a dark room into a bright and welcoming space. Many homeowners ask us whether they should choose a Velux window or a more traditional roof window system.

At LORD Roofing, we install a wide range of roof windows across domestic properties. We help you understand the differences, the benefits and what will work best for your home. In this guide, we explain everything in clear terms so you can make the right choice.

What Is a Velux Window?

Velux is a well known manufacturer of roof windows. Over time, many people have started using the word Velux to describe roof windows in general, but Velux is a specific brand.

Velux roof windows are designed to sit within the slope of a pitched roof. They provide natural light and ventilation, and they come in a wide range of sizes and styles.

Velux has built a strong reputation for quality, durability and performance. Their products include manual and electric opening options, as well as models with rain sensors and integrated blinds.

When people ask for a Velux window, they usually mean a branded roof window installed into a pitched roof.

What Are Traditional Roof Windows?

The term traditional roof window can mean different things. It may refer to roof windows made by other manufacturers, or it may refer to older style units that do not carry the Velux brand.

Some traditional roof windows offer similar features to Velux. Others may have more limited glazing options or fewer design variations.

In some cases, traditional roof windows are used to describe conservation style rooflights fitted into older properties. These often have slimmer frames and a more heritage appearance.

The key difference often comes down to brand, product range and performance standards.

How Do Velux and Other Roof Windows Compare on Quality?

Quality matters when you cut into your roof structure. A poorly made roof window can lead to leaks, drafts and heat loss.

Velux products are known for consistent manufacturing standards. They undergo testing for weather resistance, thermal performance and durability.

Many alternative roof window brands also offer strong performance. However, the quality can vary between manufacturers.

At LORD Roofing, we only install roof windows from trusted suppliers. We assess the build quality, glazing specification and flashing kits before recommending a product.

When comparing options, look at:

The quality of the frame material
The type of glazing used
The warranty offered
The compatibility of flashing kits
The energy efficiency rating

These factors affect how well your roof window performs over time.

Which Option Offers Better Energy Efficiency?

Energy efficiency is a key consideration for loft conversions and extensions. You want to bring in natural light without losing heat.

Velux windows often come with high performance double or triple glazing. Many models include low emissivity coatings and gas filled cavities to reduce heat transfer.

Some traditional roof windows also offer double or triple glazing, but the specifications may differ.

If you plan to use your loft as a bedroom or office, strong thermal performance will help you maintain a comfortable temperature throughout the year.

We always check the U value of the roof window. A lower U value means better insulation.

Correct installation also plays a major role. Even the most efficient window will underperform if installed incorrectly. We ensure proper insulation around the frame and use the correct flashing system for your roof covering.

What About Ventilation?

Good ventilation prevents condensation and improves indoor air quality.

Velux offers a range of opening styles, including top hung and centre pivot models. Many units include built in ventilation flaps that allow fresh air in while the window remains closed.

Electric and solar powered models offer remote operation, which works well for high level installations.

Traditional roof windows may offer manual opening only. Some have fewer ventilation features.

If your loft tends to get warm in summer, an opening roof window can make a significant difference. For kitchens or bathrooms in extensions, ventilation is especially important.

We help you choose a model that suits the function of the room.

How Do They Compare on Design and Appearance?

Appearance matters, especially if your roof is visible from the front of your property.

Velux windows have a clean, modern design. They suit contemporary loft conversions and rear extensions.

If you live in a conservation area or own a period property, you may prefer a more traditional rooflight with slimmer frames and a lower profile.

Some conservation style roof windows sit flush with the roof covering and use black frames to create a subtle appearance.

When planning your project, consider:

The age and style of your property
Planning restrictions
The size and number of windows required
The internal finish you want

At LORD Roofing, we advise on both external appearance and internal light distribution.

Are There Differences in Cost?

Cost often influences the final decision.

Velux windows typically sit at a mid to upper price range. You pay for brand reputation, product development and wide availability of accessories.

Alternative roof windows may offer a lower upfront cost. However, you should consider long term performance and warranty coverage.

Installation cost depends on:

The size of the window
The roof structure
The type of roof covering
Access requirements
Internal finishing work

We provide clear quotations so you understand the full cost before work begins.

Choosing a cheaper window that fails early can cost more in the long run. We focus on value rather than headline price.

What About Installation and Waterproofing?

Installation quality is critical.

Velux provides dedicated flashing kits designed to suit different roof coverings, including tiles and slate. These kits help create a watertight seal around the window.

Other roof window manufacturers also provide flashing systems, but compatibility varies.

When we install a roof window, we:

Check structural openings
Install proper support timbers
Fit the correct underfelt collar
Use the appropriate flashing kit
Insulate around the frame
Seal all junctions carefully

These steps prevent leaks and reduce the risk of condensation.

A professional installation ensures your new roof window performs as intended.

Which Option Is Best for a Loft Conversion?

For most loft conversions, a Velux window offers a reliable and flexible solution.

The wide product range allows you to choose different sizes and opening styles. Electric models suit high ceilings. Integrated blinds help control light in bedrooms.

If you need to meet fire escape requirements, certain top hung Velux models provide suitable opening sizes.

However, in period properties or conservation areas, a traditional conservation rooflight may better match the character of the building.

We assess your loft layout and planning constraints before advising on the best option.

Which Option Works Best for Extensions?

In pitched roof extensions, Velux windows often provide excellent light and ventilation.

If your extension has a flat roof, you may consider flat roof windows or roof lanterns instead.

Traditional conservation rooflights can also work well on single storey extensions where you want a more discreet external finish.

The right choice depends on the design of your extension and how you intend to use the space.

Final Thoughts

Velux windows and traditional roof windows both have their place. The best option depends on your property, your budget and your design goals.

Velux offers strong brand reputation, consistent quality and a wide product range. Alternative roof windows may suit specific design requirements or tighter budgets.

At LORD Roofing, we help you compare options clearly and honestly. We focus on performance, appearance and long term reliability.

If you are planning a loft conversion or extension and want expert advice on roof windows, contact LORD Roofing today. We will guide you through the options and install a solution that brings lasting light and comfort to your home.