Let the Light In: Interior Design That Starts with Daylight

At Square One Architects, we believe that great interior design begins with light. Not just artificial lighting plans—but the nuanced choreography of daylight as it moves through space, interacts with surfaces, and reveals the texture and tone of materials throughout the day.

Whether we’re working on a home refurbishment in Hampton or reimagining a flat in South West London, our interiors are shaped by how light behaves. We consider the orientation of each room, the reflectivity of finishes, and the tactile qualities of timber, stone, and fabric. The result? Spaces that feel calm, coherent, and deeply personal.

Why Daylight Matters

Daylight isn’t just a source of illumination—it’s a design material in its own right. It affects mood, energy, and spatial perception. In our projects, we use daylight to:

• Highlight architectural features

• Enhance the grain and depth of natural materials

• Create rhythm and variation throughout the day

From skylit kitchens in Teddington to layered living rooms in Thames Ditton, our interiors are designed to evolve with the sun.

Interior Design That Responds to You

Every client is different. That’s why our interior design services in Hampton begin with listening. We want to understand how you live, what you value, and how your space can support and inspire you. We tailor every detail—from furniture layouts to finish selections—with clarity and care.

Ready to Begin?

If you're planning a refurbishment in Hampton or looking for thoughtful interior design in South West London, we’d love to help.
Contact us to start your interior journey.

Improving Daylight, Space and Living for a Terraced Home in Teddington

We are sharing an update on our latest project in Teddington—a ground floor rear extension to a terraced house. This project shows how architectural changes can improve everyday living while remaining considerate of neighbours.

Project Background

The property has a non-original, partial width ground floor rear extension used as the kitchen. Our client wants to replace this with a new, full width rear extension. The aim is to create an open plan space for the kitchen, living and dining areas, making the main part of the home more practical and inviting.

Design Approach

Understanding the limits of a terraced property, especially regarding light and the relationship with neighbouring homes, guided our design. The client’s brief put focus on daylight, asking for interiors with more natural light.

Daylight Optimisation

To address this, we included a glass roof on one side of the extension, sloping down to 2.2 metres. This allows light to reach deep into the new living areas while reducing the impact on adjacent properties.

We also carried out daylight simulations, analysing how sunlight moves through the space during the day. These studies informed our artificial lighting plan, making sure the open plan kitchen, living and dining areas stay well-lit at any time, in any weather.

Modern Aesthetics and Connection to the Garden

The rear elevation will have “Crittal style” French doors. These create a connection to the garden and bring daylight into the interior. The industrial look of the doors fits with the new extension and respects the house’s character.

Sensitivity to Neighbours

We have considered the effect on neighbouring homes. By limiting the glass roof height to 2.2m on one side and looking at the overall size, we have reduced potential loss of light or privacy for neighbours.

Looking Ahead

With detail design under way, we look forward to seeing this project built. We think it will show how careful design can improve living in older terraced homes.

Stay tuned for progress updates, and contact us if you are considering a similar project in Teddington or elsewhere.

Luminance prediction on March 21st at 12.00

Luminance prediction on June 21st at 12.00

Luminance prediction on September 21st at 12.00

Rear extension in Epsom completed

Today, we visited a completed rear extension project for a 3-bedroom house in Epsom.

The property included both a roof extension and an original outbuilding on the ground floor, shared with the neighbouring property.

The client aimed to extend the property towards the rear, incorporating a side return that would extend 7m deep, all while preserving a side alleyway.

The new extension features a kitchen seamlessly integrated into an open-plan dining area.

Facing northeast, the rear of the property required careful planning to maximize daylight. Therefore, selecting the right size and placement of doors, windows, and rooflights was crucial.

To comply with planning advice, we reduced the eaves height of the rear extension towards the detached neighbour and designed a pitched roof for the side return section, with an external eaves height of approximately 2.2m. This design element not only became a distinctive feature of the space but also allowed the installation of wide roof windows, which flood the open-plan area with natural light.

We and the clients are delighted with the final result, which beautifully enhances the home's functionality and aesthetic appeal.

Site visit in New Malden

Today we visited our recently finished project in New Malden. This property has come a long way since 2023. Damaged by flooding and in need of refurbishment, we worked carefully with our client and successfully equipped this 4-bedroom house with a spacious new extension. Whilst the house previously felt quite dark and small, the new addition of large glazed elements now brings plenty of light into the space, as well as creating a connection with the garden allowing for an improved flow and functionality to the home. The decision to retain existing elements like the curved staircase has created a blend between the existing house and the contemporary style of the extension which makes the living space truly unique. A high quality of craftsmanship and design can be seen through the property in the joinery and detailing. We are extremely pleased with the finished product and professional photos will follow later this year.

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Let the Light In: Maximizing Natural Illumination with Skylights in Your Pitched Roof Extension

In the realm of home design, natural illumination is a powerful tool that can transform any space, creating an inviting atmosphere and enhancing the overall aesthetic. If you're planning a pitched roof extension, incorporating skylights is a surefire way to flood your space with beautiful, natural light.

Skylights have long been favored by architects and homeowners alike for their ability to brighten up dark corners and create a seamless connection between indoors and outdoors. Whether you're aiming to create a cozy reading nook or a light-filled dining area, skylights offer a versatile solution to maximize daylight and create a sense of openness.

With the right placement and design, skylights can not only illuminate your space but also provide additional ventilation and stunning views of the sky above. From traditional to modern, the options are endless when it comes to skylight styles and finishes, allowing you to find the perfect match for your pitched roof extension.

Benefits of natural illumination in home design

When it comes to home design, natural illumination has a multitude of benefits that go beyond aesthetics. The use of skylights in a pitched roof extension can significantly enhance the overall atmosphere and livability of the space. By harnessing natural light, you can create a welcoming and uplifting environment that positively impacts your mood and well-being. Natural light has been proven to improve productivity, increase focus, and even regulate our sleep-wake cycles. Additionally, by relying more on natural light, you can reduce your energy consumption and lower your electricity bills. Skylights are an eco-friendly solution that allows you to enjoy the beauty of nature while being conscious of your environmental impact.

Understanding different types of skylights for pitched roofs

When it comes to skylights for pitched roofs, there are several options to choose from. The most common types include fixed skylights, vented skylights, and tubular skylights. Fixed skylights are stationary and do not open, making them ideal for areas where ventilation is not a priority. Vented skylights, on the other hand, can be opened and closed to allow for air circulation and improved ventilation. These are especially useful in areas such as kitchens and bathrooms where moisture control is important. Lastly, tubular skylights are a compact option that uses reflective tubes to capture and distribute natural light throughout the space. They are particularly useful in rooms with limited ceiling space or where traditional skylights are not feasible. Each type of skylight has its own unique characteristics and benefits, so it's important to consider your specific needs and preferences when making a decision.

Factors to consider when choosing skylights for your pitched roof extension

Choosing the right skylights for your pitched roof extension requires careful consideration of various factors. One of the key considerations is the size and placement of the skylights. The size of the skylights should be proportional to the size of the room and the pitch of the roof. Oversized skylights may result in excessive heat gain or loss, while undersized ones may not provide sufficient light. The placement of the skylights is also crucial in maximizing natural illumination. Consider the orientation of your roof and the path of the sun throughout the day to determine the optimal placement for the skylights. Additionally, it's important to think about the design and aesthetics of the skylights. Choose a style and finish that complements the overall design of your pitched roof extension and enhances its visual appeal.

Installation process and considerations for skylights in pitched roof extensions

Installing skylights in a pitched roof extension requires careful planning and professional expertise. The first step is to consult with a qualified contractor or architect who specializes in skylight installations. It's important to ensure that the installation process is done correctly to prevent any leaks or damage to your roof. Proper insulation and flashing are essential to maintain the integrity of the roof and ensure the skylights are weatherproof. Additionally, consider the type of glazing for the skylights. Options include single-pane, double-pane, and even triple-pane glazing, each offering different levels of insulation and energy efficiency. The installation process may vary depending on the type of skylights chosen, so it's crucial to follow the manufacturer's instructions and consult with professionals throughout the process.

Tips for maximizing natural illumination with skylights in your pitched roof extension

To make the most of natural illumination in your pitched roof extension, there are a few tips and tricks to keep in mind. First and foremost, consider the placement and size of the skylights. Optimal placement allows for the maximum amount of natural light to enter the space throughout the day. Additionally, consider using skylight covers or blinds to control the amount of light and heat entering the room. This allows you to adjust the lighting levels based on your preferences and the time of day. Another tip is to strategically place mirrors or reflective surfaces near the skylights to amplify the natural light and create a brighter and more spacious feel. Finally, don't forget to incorporate other elements of interior design that can enhance natural illumination, such as light-colored walls, reflective flooring, and strategically placed furniture to maximize the light's reach.

Maintenance and care for skylights in pitched roof extensions

Proper maintenance and care for your skylights are essential to ensure their longevity and performance. Regular cleaning is important to prevent dirt and debris from obstructing the light and compromising the clarity of the skylights. Use a non-abrasive cleaner and a soft cloth to gently remove any dirt or residue. Additionally, inspect the skylights for any signs of damage, such as cracks or leaks, and address them promptly to prevent further issues. Keep an eye on the seals and flashing around the skylights to ensure they remain watertight and weatherproof. It's also a good idea to have your skylights professionally inspected and serviced on a regular basis to identify any potential issues early on and prevent costly repairs down the line.

Case studies of successful pitched roof extensions with skylights

To gain inspiration and see the transformative power of skylights in pitched roof extensions, let's take a look at a few case studies. One example is a cozy attic conversion that utilized skylights to turn a dark and cramped space into a bright and airy bedroom. By strategically placing skylights along the sloping roof, the room is now flooded with natural light, creating a serene and inviting atmosphere. Another case study involves a kitchen extension that features a large, glass-roofed skylight. This design element not only floods the kitchen with daylight but also provides a stunning view of the sky above, creating a unique and captivating focal point. These case studies demonstrate the versatility and impact of skylights in transforming pitched roof extensions into beautifully illuminated spaces.

Cost considerations for skylights in pitched roof extensions

When considering skylights for your pitched roof extension, it's important to factor in the cost implications. The cost of skylights can vary depending on factors such as size, type, and design. Fixed skylights tend to be more affordable compared to vented or tubular skylights. Additionally, the cost of installation should be taken into account, including any necessary modifications to the roof structure and the expertise required for a proper installation. It's worth noting that while skylights may require an upfront investment, they can provide long-term energy savings and increase the value of your home. Consider your budget and priorities when making a decision, and consult with professionals to get accurate cost estimates for your specific project.

Conclusion: Transforming your pitched roof extension with skylights

Skylights have the power to transform a pitched roof extension into a bright and airy haven, maximizing natural illumination and creating a seamless connection between indoors and outdoors. By harnessing the beauty of natural light, you can enhance the overall atmosphere and livability of your space while reducing your energy consumption. Understanding the different types of skylights, considering the factors that influence their selection, and following proper installation and maintenance practices are key to maximizing their benefits. Whether you're looking to create a tranquil bedroom or a vibrant living area, skylights offer a versatile solution that can elevate the aesthetics and functionality of your pitched roof extension. So, let the light in and embark on a journey of transforming your space into a beautifully illuminated sanctuary.

Site visit in Surbiton

We had the opportunity to visit one of our ongoing projects in Surbiton, which involves constructing a rear and side extension to a beautiful period detached house. This particular property, boasting 5 bedrooms, is an exquisite example of Victorian architecture and was worthy of receiving the local listing of Townscape Merit.

Before our intervention, the house had various disjointed extensions at the rear, including a kitchen extension, a conservatory, a utility area, and a guest WC. As a result of these additions, the layout of the ground floor felt rather incoherent, lacking a cohesive flow.

To rectify this, Square One Architects was brought on board to design a side return extension that would not only open up the plan but also create a more spacious kitchen and dining area. Our client expressed a desire for an airy and light-filled space, and thus, our proposals focused on maximizing natural daylight while ensuring appropriate insulation.

In addition to the expanded kitchen and dining area, our plans included a new utility space, a pantry, and a guest WC, which would enhance the functionality and convenience of the house. As part of the overall redesign, we also decided to remove the existing chimney breast located in the old dining area. This alteration significantly improved the layout of the ground floor.

To improve the connection between the internal and external spaces, we meticulously designed a flush transition, eliminating any steps between the existing paved area at the rear of the house and its garden. This seamless integration would enhance the accessibility and flow between indoor and outdoor living.

At present, the project is progressing exceptionally well, thanks to the expertise and dedication of the contractor. We are truly excited to witness the evolution of this remarkable transformation. Although the glazing has not been delivered yet, the outline of the glass roof on the side and the presence of large patio doors at the rear provide a glimpse of the extraordinary final outcome that awaits.

Daylight and luminance analysis for an extension in Kingston

We regularly use analysis tools to predict the amount of daylight received in a space as a function of the openings size, location and moment of the year. In this view we are showing the predicted Luminance on the 21st of March at 12.00 for our new ground floor extension in Kingston.

Daylight analysis tools offer to foresee the exact amount of daylight received by a determined space in several moments of the year. These tools are always very helpful in general, but they play a crucial role in our designs. By scrolling through our project images it is easy to see that daylight intake is a common thread, we are convinced that daylight within a household plays an huge factor in the health and well being of its inhabitants and we feel a duty as Architect to try and optimize this factor in all our projects.

In the case of this project for a rear extension in Kingston, we analysed the daylight intake with a configuration of a sliding door at the right, a generous window at the left and three skylights placed in the middle of the rear extension’s ceiling. With this type of diagram, it is very easy to see that the daylight will be very evenly distributed throughout the floor plan without being overwhelming (refer to the area in green).

Lighting design is a complex discipline, but we try to explain these metrics and parameters to the clients in a very straightforward way so they can understand the rational behind the dimension of the openings in their extensions.

These tools have become an essential part of our work at any stages of the design, especially at preliminary stages prior to submitting a planning application. We look forward to seeing this project finished and show this point with the final pictures.

Work in progress: Daylight analysis for one of our projects in Hampton

We usually determine the final dimension of doors and skylights using daylight analysis tools. These tools play a crucial role in our design process, allowing us to carefully assess and optimize the luminance levels on specific dates. For one of our ongoing projects in Hampton, we recently conducted a thorough analysis and the images below refer to a daylight simulation on March 21st at 12.00.

When it comes to predicting daylight levels, at Square One Architects, we rely on two key metrics: daylight factor and luminance. These metrics provide us with valuable insights, each with its own advantages and limitations. The daylight factor offers a straightforward snapshot of the projected average daylight levels, while luminance provides a more intricate analysis, taking into account factors such as orientation, the day of the year, and the time of day. By carefully cross-referencing these results, we can effectively communicate to our clients the reasons behind our optimized design choices for doors, windows, and skylights, tailored to their unique project requirements.

This particular project involves both a ground floor extension and a loft extension, posing unique challenges when it comes to daylighting. When it comes to the ground floor extension, it is of utmost importance to consider the predicted level of daylight in relation to the orientation of the building and the size of the glazed surfaces. Thankfully, in this case, the rear extension faces north, granting us the opportunity to incorporate generous glazed surfaces while minimizing the risk of overheating during the warmer summer months.

Render vs completed photo of our latest house extension in Byfleet & New Haw

It's always interesting to look back at the design and evaluate how the final product compares to the initial intent. In this image a photo realistic render (above) is compared to a final image of a kitchen space.

It is always essential to keep track of the relationship between designed spaces and final build project in order to verify the validity of our vision and take note of what has been improved during construction or what could have been built differently.

In the case of this project for or a rear and side extension to detached house in Byfleet and New Haw we were pleased to see that our 3D model rendering (first image above) looks very similar to what the contractor delivered on site.

First and foremost, the size of the openings and the subsequent amount of daylight received by the internal spaces was correctly predicted by the virtual analysis carried out through the rendering engine. Second, the materials that the client had chosen where confirmed to be a good match for the type of space that we had designed.

This project proves once again that 3D modelling and rendering tools can provide an invaluable help to both the Architect and the client.

By using these tools, the Architect can convey an idea in a very straightforward manner and the client can understand it right away, taking the necessary decisions when requested by the Architect.

We feel that the best stage to provide this type of drawings to a client is detail design where decisions about materials and certain technical details need to be finalised. Although there is a benefit in producing preliminary 3D models at earlier stages of the design, we see little point in generating super realistic images without any decision being made by the client regarding large items such as finishes, kitchen etc…

Rear extension in Twickenham

First image of our new project for the rear extension of a semi-detached single family house in Twickenham!

The rendering above shows our initial proposal for our 2016 project of a rear extension to a terraced house in Twickenham. The property in question was semi-detached and featured a non-original, very narrow and poor-quality built rear extension that used to house the kitchen and did not take advantage of the full width of the plot.

The client’s wish was to form a new open plan kitchen and living area opening towards the rear garden with the kitchen in the middle of the extended house.

The position of the kitchen in relation to rear extension is an important element and it comes down to individual preference. In some cases extensions are wide enough to house both kitchen and dining or living area to the rear like in the case of our house extension in Teddington and many other examples on our project page, however in some cases the existing house is just too narrow and just one between kitchen and dining area can be housed a the rear.

Some families tend to use the kitchen as a very social space, in which case it may make sense to place it towards the rear with the best views of the garden, access to daylight and connection with the patio.

Some others see the kitchen as a less social space and prefer to place a dining area or living space at the rear. This is something worth thinking long and hard before taking a final decision.

In this case the client decided to place the kitchen in the central section of the property. In this configuration it is very important to design the kitchen as a feature and keep it very tidy since you will always move across the kitchen to go from the front of the house to the rear. This is one of the reasons why the client asked us to design the kitchen from scratch in order to ensure that the design quality was consistent throughout the whole ground floor of the property.

We have to give credit to the clients for their commitment to good design. We enjoyed the overall design process and were very pleased with the final result..

You can see the final images of this project here.