Best Price Guarantee
Best Price Guarantee We will never be beaten on price
Nationwide UK Delivery
Nationwide UK Delivery Fast Delivery Nationwide UK
Designed & Manufactured
Designed & Manufactured in the UK

Loft Conversion Windows: Complete Guide

Window with grid

Thinking about the best windows for a loft conversion? There are lots of different options available – make sure you pick the right ones for your property with our guide.

You can also view our complete guides to loft room conversions and loft ventilation.

Loft conversion window options

When planning a loft conversion, selecting the right windows is important not only for aesthetics but also for functionality. Windows can improve the overall value and comfort of your loft space, and here we’ll explore various types that fit perfectly into loft conversions.

Ordinary windows

Ordinary windows are a good option for loft conversions. They come in various styles such as sash, casement, and tilt-and-turn, each providing unique benefits. Casement windows, for example, are ideal for promoting good ventilation, an essential aspect in a newly converted loft. When integrating windows for loft conversion, consider the orientation and size to maximise natural light and airflow, keeping your loft bright and airy.

Learn when to replace windows in our guide.

Roof windows

Roof windows are an excellent choice for loft conversions due to their ability to fit seamlessly into the roofline. Roof windows offer plenty of light without compromising privacy. These are a common choice for loft conversion windows. Opting for high-quality, durable materials ensures longevity and better insulation, which is vital for energy efficiency.

Roof lanterns

Roof lanterns make a striking addition to your loft conversion. They sit above the roof and provide a glazed structure that allows light in from all angles, making them great for spaces with limited natural light. Apart from their aesthetic appeal, roof lanterns can improve thermal efficiency, making your loft space usable throughout the year. They are often considered for larger loft conversions where aesthetics and architectural impact are priorities.

Flat rooflights

Flat rooflights are an effective option for introducing more light into your loft conversion, especially in areas with limited vertical space. These installations are flush with the roof, offering a sleek and modern look without protruding into the skyline. Ideal for flat-roofed lofts, they provide plenty of daylight and can significantly reduce the need for artificial lighting, making them an energy-efficient choice for your home.

Learn when to replace skylights in our guide.

Pitched rooflights

For those with pitched roofs, pitched rooflights are tailor-made to complement the angle of your roof. These windows not only add to the architectural lines of your loft but also increase the amount of natural light entering the space. Pitched roof lights can be designed to be non-opening or have the functionality to open, providing both light and ventilation via your loft conversion windows.

Opening rooflights

Opening rooflights offer both light and ventilation, making them an excellent choice for maintaining air quality and comfort in your loft space. These windows can be operated manually or via electronic systems, allowing for ease of use. They are perfect for loft conversions where better air circulation and ventilation is needed.

Juliet balconies

Juliet balconies are a great choice for loft conversion windows, adding not just aesthetic value but also a sense of openness. These installations involve a vertical sliding or French door set behind a safety railing, without an external platform. They allow for unobstructed views and the enjoyment of the outdoor environment from the comfort of your loft, making them popular in urban areas where outdoor space is at a premium.

Factors to consider

Maximising natural light

Maximising natural light should be a primary goal when selecting windows for your loft conversion. Natural light not only makes the space feel larger and more inviting but also helps reduce energy costs. Consider the placement and size of the windows, aiming for those that offer natural light without compromising on thermal efficiency. Roof windows and large glazed units are particularly effective in achieving these goals.

Preventing overheating

While it’s important to maximise natural light, it’s equally important to consider the heat of your windows to prevent your loft from overheating. High-quality glazing solutions that include solar control coatings can help manage heat gain during warmer months. Ventilation is also important. If your home gets hot regularly in summer months, it may be worth getting a loft conversion window that can open and close.

Learn how to make a room cooler in our guide.

The number of rooms in your loft conversion

The number of rooms in your loft conversion will influence your window choices. Bedrooms may need windows that offer good sound insulation, light control and privacy. Living areas might benefit from larger, more expansive glazing to enhance views and natural light. Carefully plan each room’s windows to align with these functional needs.

Whether your loft conversion has a bathroom

If your loft conversion includes a bathroom, consider privacy and ventilation in your window choice. Frosted or obscured glass can provide privacy, while opening windows or rooflights can offer ventilation to prevent moisture build-up and maintain air quality. These features are essential in maintaining the structural integrity and comfort of bathroom spaces in loft conversions.

Learn what to do when there’s mould in your loft.

The views

Choosing the right windows can dramatically improve the views from your loft conversion. Consider the orientation of your home and the natural landscapes available when selecting window placements. Expansive windows or strategically placed rooflights can frame beautiful outdoor scenes, making your loft a more pleasant and valuable space.


Security is another concern in any home improvement project, including loft conversion windows. Any loft conversion windows installed should be robust and secure. Opt for windows that come with strong locking mechanisms and are made from toughened or laminated glass. These materials are harder to break, offering an added layer of security against potential break-ins.


Managing the temperature within your loft conversion is important for year-round comfort. Select windows with good insulating properties to help maintain a consistent indoor climate. Double or triple-glazed windows can significantly reduce heat loss in winter and keep your loft cooler in summer. Additionally, consider windows with thermal breaks and inert gas fillings, which are excellent for reducing thermal transfer and improving energy efficiency.

Do loft conversion roof windows require planning permission?

Whether you need planning permission for loft conversion windows largely depends on the extent of the modifications and local regulations. Generally, roof windows and skylights often fall under permitted development rights. This means they don’t require planning permission if they do not protrude more than 15 centimetres beyond the plane of the roof, and are not installed in the front of the house. However, we recommend consulting with your local planning authority to ensure compliance, especially if your property is listed or located in a conservation area.

Why choose Toughened Glass Systems for your loft conversion windows?

We offer a range of loft conversion windows that are high quality and reinforced with toughened glass. This means they will last longer, provide better insulation, and offer more security than that of regular glass.  Our collection of rooflights include:

More helpful articles:


What are the rules for windows in a loft conversion?

For loft conversion windows, make sure you stick to building regulations regarding safety, ventilation, and energy efficiency. Always verify local planning permissions, especially in conservation areas.

What are the best windows for loft conversions?

The best windows for loft conversions are typically roof lights and skylights. These maximise natural light and improve ventilation. Features to consider include thermal insulation, noise reduction, and user-friendly opening mechanisms.

Do loft conversions need escape windows?

Yes, loft conversion windows require escape windows to comply with safety regulations. These windows must be accessible and large enough to serve as a means of egress during emergencies, meeting the minimum size requirements specified by local building codes.

Based on 210 reviews
Bob toploft
Bob toploft
I am the owner of Top loft company ltd, after reviewing reviews from various companies I ordered 2 juliet balconies from tgs arrived within 3 weeks, comunications and help was brilliant. Thanks for all your help.
Jim H
Jim H
Great service from the team. Easy to order, good buying guidance and clear install instructions for my builder. Rooflights look absolutely great! The team at TGS couldn't have been more helpful in organising a smaller delivery vehicle to help with restricted access. Highly recommend TGS.
Jack Smith
Jack Smith
Great service from a very knowledgeable company. Thanks team Toughened Glass Systems.
Paul Smith
Paul Smith
I was spending a lot of money on several rooflights so I wanted to make sure I got it right and I did. The professionalism, expertise and the quality of the roof lanterns really set Toughened Glass Systems apart.
Tyrone Eldridge
Tyrone Eldridge
There are no complaints about the experience with TGS. The entire process of ordering, supplying and delivering was flawless. I would really recommend you order your flat roof sky lanterns from these guys.
Robert Childers
Robert Childers
Best place for rooflights, they supply many different types and options. Thanks for all your support Toughened Glass Systems!
John Smith
John Smith
The glass balustrade gives us an amazing view onto the lake outside. So happy we ended up going for the frameless glass balcony from Toughened Glass Systems instead of one with posts
Louise Newsome
Louise Newsome
My job is to design the interiors for a lot of houses and a lot of times the hardest part was when the client wanted some really inexpensive rooflights that should look like some contemporary ones as well. That until I found Toughened Glass Systems and started working with them more and more. They have a lot of this kind of stuff at a very decent price, a price for anyone I can say. If you’re looking for cheap skylights for flat roofs or any types of roof lights, they probably have something for you.
Krystina Taylor
Krystina Taylor
Always kept us up to date with our order even when delayed by a few days. Great service from the start and good quality glass balcony delivered.