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How Many Windows Do I Need for My Room?

White framed glass window during daytime

Getting the right number of windows for a room is important – not just for the aesthetic of your home but also for the functionality and comfort of your space. Here’s why the number of windows is important for your home and the factors you should consider.

What is the optimal window space?

The general guideline suggests that the window area should be at least 20% of the floor area for the ideal amount of natural light. However, this is a brief guideline and can vary based on room usage, orientation, and climate. An optimal window design considers both the size and placement to enhance the room’s functionality and comfort.

Let’s look at the various factors in more detail.

Why is the number of windows important?

Windows allow natural light to enter your space, which plays a big part in making your space feel warm and welcoming during the daytime. Natural light is known to boost mood and productivity, making windows an important part of any room design. Alongside this, windows also play a significant role in ventilation, allowing fresh air to circulate and reducing the build-up of pollutants. They are also a great tool for regulating the temperature of your indoor space, particularly during the hot summer months.

Benefits of extra windows

Making sure you have plenty of windows in your room design has a range of advantages. In addition to improving the look and feel of your space, additional windows can improve energy efficiency. More natural light means less reliance on electrical lighting, reducing energy costs. Installing newer windows can also provide excellent insulation, retaining heat and lowering energy expenses better than older windows. The strategic placement of extra windows allows you to connect your indoor space with the outdoor environment, making your room more aesthetically pleasing and adding value to your property.

Factors to consider

When deciding on the number of windows for your room, several factors come into play. The size and purpose of the room, its orientation, and the local climate are things you should be thinking about. Additionally, aspects such as privacy, aesthetic preferences, and the architectural style of your home should also influence your decision. Taking all of these things into account will help you achieve a functional design that meets your needs. It is always worth considering professional advice from the people who will be undertaking the construction of the project too. 

Room type

The type of room plays a large role in how many windows you need. For example, living areas and kitchens benefit from larger windows or multiple windows to enhance natural light and ventilation, supporting a lively and inviting atmosphere. Bedrooms might need fewer windows to ensure the correct amount of privacy and light, especially for those who are light-sensitive during sleeping hours.

Furniture placement

Where your furniture is placed can play into the positioning and number of windows in a room. Windows should be located to maximise light and views without interfering with the layout of furniture. Think about the placement of large items such as beds, sofas, and wardrobes. Windows should fit around your furniture, enhancing the space rather than creating awkward spaces. 

Think about where the light will come in too, for example, if you are placing a TV or an office, think about the placement of screens and where the light will come in to minimise glare. Proper planning with a focus on natural light can make rooms feel more spacious and welcoming. Don’t forget, you can always move your furniture around later if required, but it is always good to plan ahead if possible.

The size of the windows

Depending on the size and shape of the space, you can usually opt for a few large windows or several small windows. Large windows can make a dramatic statement and flood a room with light, making spaces feel larger and more open. However, they also need to be balanced with the room’s thermal comfort and energy efficiency. Smaller windows, on the other hand, can offer more flexibility in terms of placement and can be used to highlight certain architectural features or landscapes. Ventilation, light, and aesthetics are all important things to consider when thinking about the size of your windows.

View our helpful guide to rooflight sizes.

The environment

The surrounding environment of your home should influence your window choices. Rooms with scenic views can benefit from larger windows, which can offer great views. For urban settings, where privacy might be a concern, smaller, strategically placed windows or the use of textured or frosted glass can provide light while maintaining privacy. You should also think about the local climate and the amount of insulation and ventilation needed to keep the indoor environment comfortable year-round.

Normal window or roof window?

Roof windows are great for bringing in sunlight from above, particularly in loft spaces or rooms where wall space is limited. They offer a distinct way to flood a room with natural light, often more so than traditional windows. However, normal windows provide opportunities for ventilation and views at eye level, which can be preferable in living spaces and bedrooms. You should typically think about having a mixture of both if possible, although many rooms may not be able to accommodate skylights or roof windows. Larger roof windows are often considered a statement piece for large open spaces, whereas smaller roof windows tend to work better in attic rooms and loft conversions.


In areas such as bathrooms or bedrooms facing neighbouring properties, consider options like frosted or textured glass that allows light in while obscuring visibility. Skylights or high-placed windows can also offer natural light without compromising privacy.

The orientation of your home

The orientation of your home affects the amount of sunlight rooms receive, which can impact both lighting and the heat of a room. North-facing windows can provide consistent, natural light with minimal direct sunlight, reducing the risk of overheating and glare. South-facing windows offer more opportunity for sunlight, which can be beneficial in colder climates but sometimes may require additional shading to prevent overheating in warmer months, depending on your local climate. Easterly-facing windows will offer sun in the morning and westerly-facing windows will offer sun in the evening, so this is also something to take into account when choosing the layout of your home.

The climate

In colder climates, windows with better insulation are important to retain heat and reduce energy consumption. In warmer climates, windows that offer good ventilation and shading options help to keep interiors cool and comfortable.

Your options when choosing windows

When selecting windows, there are plenty of options available, ranging from traditional designs to modern innovations. Your choice will depend on the architectural style of your home, your energy efficiency needs, and your personal preferences for light and ventilation.

Traditional windows

Traditional windows, such as sash and casement windows, offer a specific type of aesthetic that you may want to opt for depending on what type of home you have. They can be designed to fit different spaces and are available in a variety of materials and finishes. These windows provide excellent ventilation and can easily be opened and closed.

Rooflights and skylights

Rooflights and skylights are great options for introducing additional natural light into a space, especially in areas where wall windows are not feasible. They can transform dark, unused attic spaces into bright, airy rooms. Besides improving daylight access, they also add a modern aesthetic to your property which can result in an increase in value.

Roof lanterns

Roof lanterns are a specific type of roof light that adds a prism-shaped glass window on the roof. They are a stylish way to flood a room with natural daylight and add a striking centrepiece to your space. Perfect for extensions, conservatories, and kitchen diners, they add a sense of height and space, making any room feel more expansive. Their ability to blend in with various architectural styles while offering plenty of light access makes them a great choice for those looking to combine functionality with design flair.

Roof windows

Roof windows are specifically designed to be installed within the slope of a roof. They are ideal for attics, lofts, and extensions, providing excellent ventilation and daylight access where conventional windows might not be available. There are plenty of options for opening manually or electrically.

Tips for getting the most out of your windows

Maximising the benefits of your windows involves more than just choosing the right type and placement. Here are some tips to ensure you get the most out of your windows.

Save money with fixed rooflights

Fixed rooflights are a cost-effective solution for bringing more light into a room without the need for opening mechanisms. They are especially suitable for high ceilings and areas where ventilation can be provided through other methods. Fixed rooflights have fewer moving parts, making them more durable and easier to maintain. They also offer better thermal performance, as there are no gaps for heat to escape.

Use decor that reflects light

Improving the natural light in your room can also be achieved through interior decoration. Using mirrors strategically placed opposite windows can double the amount of sunlight entering a room, making it appear brighter and more spacious. Light-coloured walls, ceilings, and floors will reflect the sunlight and can enhance the overall lightness without the need for additional windows.

Choose frameless designs

Frameless window and door designs offer an unobstructed view and allow the maximum amount of natural light to enter a room. They also offer a minimal aesthetic that blends seamlessly within a range of architectural styles, providing a sleek and contemporary look. Besides their visual appeal, frameless designs reduce the visual bulk that frames can create, making the spaces feel larger and more open. They are often ideal for spaces with little natural light that you want to maximise, making them a great choice for larger windows.

Use blinds

Blinds offer a cheap solution for controlling the amount of light and privacy in a room. They come in various styles, materials, and opacities, allowing you to control the amount of light entering the room. Blinds can also add a layer of insulation, helping to keep your space warm in the winter and cool in the summer. There are a range of blinds, from Venetian blinds to Roman blinds, that offer different levels of lighting. Roman blinds typically offer more opacity but less flexibility, whereas Venetian blinds allow you to adjust the amount of light in more easily but can keep less light out overall.

Choose Toughened Glass Systems for rooflights and roof windows

Toughened Glass Systems provides a wide range of rooflights and roof windows to cater for all different types of buildings. If you’re wondering how many windows you need and are contemplating adding a rooflight or a skylight to your property, take a look at our collection.

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Based on 210 reviews
Bob toploft
Bob toploft
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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
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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
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Robert Childers
Robert Childers
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John Smith
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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.
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Krystina Taylor
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