About Casey & Fox

Colourful, Characterful Interiors That Tell Your Story, Not Mine

Let's Talk About Your Home

For busy families and professionals who love colour, art and a bit of quirk.

Siobhan Casey
South London Interior Designer

I’m Siobhan Casey, founder of Casey & Fox, an interior design studio based in Sanderstead, South London. For over 13 years I’ve been helping clients create homes that feel as good as they look – bold, colourful and deeply personal, never staged.

Before founding Casey & Fox, I cut my teeth at leading international architecture firm Kohn Pedersen Fox (KPF), where I worked as Project Administrator on the delivery of the new Abu Dhabi International Airport. It was a masterclass in coordination, detail, and leadership on a global scale — skills I now apply to every residential project I take on. Early in my career I had the privilege of interning with a number of high-end boutique design studios, where I worked on projects as varied as a Viennese hotel, a Caribbean holiday home and a luxury apartment at London’s prestigious One Hyde Park.

My formal training came at KLC School of Design, where I graduated with a diploma in 2010 and received the KLC Personal Achievement Award. Since then, my work has been featured in Living etc, The Telegraph, KBB Magazine and Country Homes & Interiors. Clients often tell me they expected chaos, but instead found clarity, calm and — to their surprise — even a little fun.

Day to day you’ll either find me on site with my trusty tape measure, at Chelsea Harbour sourcing fabrics, or back in the studio refining the small details that pull a whole scheme together. I speak fluent “client”, “architect” and “builder”, and pride myself on keeping everyone aligned and projects moving smoothly.

Colour is my language. I love mixing antiques with contemporary pieces, curating artwork — particularly Aboriginal art — and balancing beauty with practicality so that every room earns its keep. I will nudge you to be braver with colour than you thought possible. Trust me, you’ll thank me later.

Away from work, I foster cats and kittens for a local animal charity, which keeps life both grounded and joyfully unpredictable.

The Studio

Casey & Fox is a full-service interior design studio creating characterful homes across South London and Surrey. Based in Sanderstead, we work with busy homeowners who want more than a house that simply looks finished. They want a home with warmth, personality and practical ease. We are known for layered interiors that combine colour, art, antiques and thoughtful detail, always shaped around real life.

We work on projects ranging from single-room transformations to full home refurbishments. Our Bespoke Interiors services include space planning, kitchen and bathroom design, bespoke joinery, lighting design, furniture sourcing, art curation and complete project coordination.

From the first conversation to final styling, our process is clear, collaborative and well organised. We listen carefully, develop ideas with purpose, coordinate the right people, and guide decisions so the end result feels personal, practical and beautifully resolved.

We value longevity over churn, responsible sourcing over shortcuts, and craftsmanship over throwaway choices. Alongside our full design service, we also offer online consultations for homeowners who want expert help with a specific room, decision or design dilemma.

Explore Online Consultations

A Snippet of Our Projects

Visit our Gallery page to explore our portfolio of recent interior design projects.

The People Behind The Projects

I lead the design on every project. Around me is a close group of trusted collaborators: architects, structural engineers, builders, lighting and audio-visual specialists, landscape designers, and skilled craftspeople. We work as one team, translating vision into detail with calm authority.

Our clients value our meticulous planning, a transparent process and the steady sense of calm we bring when the dust starts flying. Whether we are rescuing a design mid-build or steering a complex renovation from start to finish, we bring clarity, warmth and a little wit.

You get one point of contact and a coordinated team. From bespoke joinery and kitchens to bathrooms, decorating and artwork installation, every element is handled with care and quality. To you it feels seamless. Behind the scenes it is a well-run team effort.

Already have an architect or builder you like? We are happy to work with them, provided they meet professional standards.

What Makes Us Different

You get one point of contact and a coordinated team. From bespoke joinery and kitchens to bathrooms, decorating and artwork installation, every element is handled with care and quality. To you it feels seamless. Behind the scenes it is a well-run team effort. Already have an architect or builder you like? We are happy to work with them, provided they meet professional standards.

– No Beige Regret: Homes that are layered, expressive and personal.
– Art at the Heart: Curated pieces shape the palette and mood.
– Calm in the Chaos: Clear plans, steady guidance and reassurance throughout.
– Tailored, Not Templated: Every design starts with you and how you want to live.
– Built to Last: Sustainable choices, responsible sourcing and craftspeople we trust.

The result is a home that feels authentic, timeless, and entirely yours.

See the work

Ready to talk about your home?

If you want a designer who listens, brings ideas and helps you avoid expensive mistakes, let’s chat.

Get in Touch
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What Our Clients Say

I had a 1 hour design session with Siobhan on zoom and it literally blew my mind! We are living in rented accommodation in Singapore, so it is very limited what we are able to do but also what we were prepared to spend to make the space work. I sent in the very detailed online form with photos ahead of the session and was slightly sceptical of what could be achieved in an hour and also online without someone actually walking around the space.I can't actually believe the difference Siobhan enabled us to make with a few simple suggestions ...
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E Ward, Singapore
I had a 1 hour design session with Siobhan on zoom and it literally blew my mind! We are living in rented accommodation in Singapore, so it is very limited what we are able to do but also what we were prepared to spend to make the space work. I sent in the very detailed online form with photos ahead of the session and was slightly sceptical of what could be achieved in an hour and also online without someone actually walking around the space.I can't actually believe the difference Siobhan enabled us to make with a few simple suggestions and ideas. The amount I spent to make the changes was also so minimal and it has completely transformed the space I was struggling with. Previously when I walked into the apartment I had a vague sense of my heart sinking and I couldn't put my finger on it. After my session with Siobhan, I now walk into my apartment and it puts a smile on my face!! Completely worth it. I highly recommend Siobhan's services!
E Ward, Singapore
I found Siobhan advice second to none. I am doing a complete renovation and wanted concrete flooring in the kitchen we talked it through. I had not considered it being such a hard floor on my back as I cook so much we came up with a much better idea. Sheep's wool for insulation and alternative suggestions for the flooring. Which had saved thousands a full list of suppliers and ideas were sent after the consultation. Siobhan has been there to advise all the way through. You would be mad to not have a conversation with this amazing women who ...
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J Eltham, Cooden Beach
I found Siobhan advice second to none. I am doing a complete renovation and wanted concrete flooring in the kitchen we talked it through. I had not considered it being such a hard floor on my back as I cook so much we came up with a much better idea. Sheep's wool for insulation and alternative suggestions for the flooring. Which had saved thousands a full list of suppliers and ideas were sent after the consultation. Siobhan has been there to advise all the way through. You would be mad to not have a conversation with this amazing women who is not selling, just wants the best for your project .
J Eltham, Cooden Beach
I used Siobhan's service 'the Design Hotline' to help us decide on a colour scheme for the exterior of our Victorian semi in South London. Siobhan spent a lot of time finding out about the aspect of the house, what our priorities and preferences were and gave us several paint colour suggestions with a clear summary of each. It made deciding which colour to choose one thousand times easier and we are absolutely delighted with how the house looks now. We have many compliments from our neighbours too! If you are struggling to decide on any interior decision and want ...
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J Jingree, Beckenham
I used Siobhan's service 'the Design Hotline' to help us decide on a colour scheme for the exterior of our Victorian semi in South London. Siobhan spent a lot of time finding out about the aspect of the house, what our priorities and preferences were and gave us several paint colour suggestions with a clear summary of each. It made deciding which colour to choose one thousand times easier and we are absolutely delighted with how the house looks now. We have many compliments from our neighbours too! If you are struggling to decide on any interior decision and want a true expert in your corner I would not hesitate to recommend Siobhan- she is truly knowledgeable, but also generous with her time and an excellent communicator.Thank you Siobhan- our house looks amazing!
J Jingree, Beckenham
"My Design Hotline session with Siobhan really opened my mind to design choices I wouldn’t have thought of and I’m so thankful. I’ve recently completed a renovation of my open plan kitchen/ living room and hallway so the walls are bare and needing some inspiration. I sent photos and videos which Siobhan analysed and provided ideas for artwork, storage units, lighting and plants - as well as links to trusted suppliers. She even discussed practical tips like putting UV screens on my bifold doors to protect the flooring and sofa from fading. I’d highly...
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H Edwards, Earlsfield
"My Design Hotline session with Siobhan really opened my mind to design choices I wouldn’t have thought of and I’m so thankful. I’ve recently completed a renovation of my open plan kitchen/ living room and hallway so the walls are bare and needing some inspiration. I sent photos and videos which Siobhan analysed and provided ideas for artwork, storage units, lighting and plants - as well as links to trusted suppliers. She even discussed practical tips like putting UV screens on my bifold doors to protect the flooring and sofa from fading.I’d highly recommend Casey & Fox interior design services, I gained so much from the hour. Thanks again Siobhan!."
H Edwards, Earlsfield
"Siobhan, thank you so much for all your wonderful creative ideas and advice. The little room will soon be turned into a super techi stylish bedroom/office. Your insight into how to makeover a small room on a budget was wonderful, I loved the fact that you were able to share so much information virtually!! Your pricing concept is genius, charging hourly and with upper limits is just unique. Offering this service to people who thought it was out of reach is wonderful. I would never have thought that I could afford to hire someone like you. Thank you so ...
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J Deeks, Fulham
"Siobhan, thank you so much for all your wonderful creative ideas and advice. The little room will soon be turned into a super techi stylish bedroom/office. Your insight into how to makeover a small room on a budget was wonderful, I loved the fact that you were able to share so much information virtually!! Your pricing concept is genius, charging hourly and with upper limits is just unique. Offering this service to people who thought it was out of reach is wonderful. I would never have thought that I could afford to hire someone like you. Thank you so much."
J Deeks, Fulham
"We recruited Casey and Fox to design our stand for the Spirit of Christmas Fair 2012. Casey & Fox took on board my requirements, concerns and comments at all stages of the project giving me full confidence in the company throughout. They provided a complete service, including a choice of carefully thought out themes, procurement, set-up and breakdown, taking a huge weight off my mind and freeing up my time to take care of other important tasks. The team were full of energy, enthusiasm and encouragement at all times and,...
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K Mowat, Grannies Inc.
"We recruited Casey and Fox to design our stand for the Spirit of Christmas Fair 2012. Casey & Fox took on board my requirements, concerns and comments at all stages of the project giving me full confidence in the company throughout. They provided a complete service, including a choice of carefully thought out themes, procurement, set-up and breakdown, taking a huge weight off my mind and freeing up my time to take care of other important tasks. The team were full of energy, enthusiasm and encouragement at all times and, without a doubt, contributed to our company’s success at the show."
K Mowat, Grannies Inc.
"Not having gone through this process before I was reluctant to work with an interior designer, but my wife was very keen to bring an interior designer on board. I couldn't have been more wrong.Our taste and style is not traditional. I run a music venue and a tattoo studio, so our style is off the hook. Once Casey & Fox had met us at the house and looked at our furniture, our art work and at the pages from magazines we had torn out over the past 3 months they came back to us with concepts which proved that ...
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J O'Grady, Surbiton
"Not having gone through this process before I was reluctant to work with an interior designer, but my wife was very keen to bring an interior designer on board. I couldn't have been more wrong.Our taste and style is not traditional. I run a music venue and a tattoo studio, so our style is off the hook. Once Casey & Fox had met us at the house and looked at our furniture, our art work and at the pages from magazines we had torn out over the past 3 months they came back to us with concepts which proved that they totally understood our style.Once the project started, communication was excellent, deadlines were met and budgets adhered to. When issues with suppliers came about they were navigated, compromises were found and options given. The process was made easy for us. The main thing (we run 2 different businesses) was that we didn't have the time or the headspace to research umpteen different kinds of flooring or companies looking to supply them. Going through Casey & Fox, they took our concepts and examples of what we wanted and came back and narrowed the field in terms of products but also in terms of suppliers - recommending ones with whom they had a good relationship.To us, it was a predominantly stress-free build. It may not have been to them! They shielded us from unnecessary drama and brought crucial issues to us only after they had been digested and resolutions and options found. We had some issues with a joiner who became very difficult to deal with and they steamed through it like absolute troopers! Their level of paperwork and detail was also very, very good. We hope to work with them again.."
J O'Grady, Surbiton
"A very kind friend bought an interior design consultation with Siobhan for me as a gift, at this charity auction last year. Siobhan contacted me before our meeting to find out about the rooms for consideration and what ideas I had already – we exchanged quite a bit of useful information by phone and email so, on consultation day when Siobhan came to my home, she was armed with good suggestions and samples. She was friendly, relaxed, full of enthusiasm and very knowledgeable – about style, fashion, fabrics and suppliers as...
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S Carter, Hampshire
"A very kind friend bought an interior design consultation with Siobhan for me as a gift, at this charity auction last year. Siobhan contacted me before our meeting to find out about the rooms for consideration and what ideas I had already – we exchanged quite a bit of useful information by phone and email so, on consultation day when Siobhan came to my home, she was armed with good suggestions and samples. She was friendly, relaxed, full of enthusiasm and very knowledgeable – about style, fashion, fabrics and suppliers as well as the practicalities of the project. She was generous with her time, emailed further layout suggestions and specialist contact details after her visit and has welcomed any further enquiries. I feel very fortunate to have been the recipient of such a fantastic gift!"
S Carter, Hampshire
"I hired Siobhan to help with our basement conversion project. I wasn't convinced I needed an interior designer as I had quite clear ideas of my own, but am so glad I did! I loved that although Siobhan didn't necessarily share my taste, she could translate my vision brilliantly. When I felt bogged down in nitty gritty, she helped me focus and made decision making very easy!We have since used her for advice on our bedroom and I wouldn't now consider a big project without consulting her!"
A Freeman, Kingston
"I hired Siobhan to help with our basement conversion project. I wasn't convinced I needed an interior designer as I had quite clear ideas of my own, but am so glad I did! I loved that although Siobhan didn't necessarily share my taste, she could translate my vision brilliantly. When I felt bogged down in nitty gritty, she helped me focus and made decision making very easy!We have since used her for advice on our bedroom and I wouldn't now consider a big project without consulting her!"
A Freeman, Kingston
"We worked with Casey & Fox on re-purposing a room in our main home and the full design/rebuild of our holiday home. Siobhan’s expertise, attention to detail, and product knowledge were invaluable - from clever layout improvements and space-saving ideas to perfect paint, flooring, lighting, and furniture choices."
M Pollard, Outwood
"We worked with Casey & Fox on re-purposing a room in our main home and the full design/rebuild of our holiday home. Siobhan’s expertise, attention to detail, and product knowledge were invaluable - from clever layout improvements and space-saving ideas to perfect paint, flooring, lighting, and furniture choices."
M Pollard, Outwood

Did You Know?

Artwork is a particular passion of mine. I treat art as a design driver. Colour palettes, proportions, textures and lighting often flow from a single piece.

When a client already owns a piece, we often begin there. When they do not, I help them discover work they genuinely connect with. We plan sightlines, scale walls correctly, choose conservation-friendly framing, and light works at the right colour temperature so they sing without glare.

I source through reputable galleries and dealers, respect cultural protocols, and ensure proper provenance and artist attribution. I am not an art dealer. I help you choose and live with art you love, alongside contemporary works, photography and sculpture when they suit the space.

For my own taste, I have a deep-seated love of Australian Aboriginal art. Its storytelling, bold colour and rhythmic line and dot work carry a powerful sense of place. A single piece can transform the feel of a room.

Want to see what is inspiring me right now? Visit the blog for recent posts on past and current exhibitions

I will be launching an Art and Colour online consultation later in 2026. If you want to be notified about when that launches, as well as receive 10% off your first consultation, then please use the button below to get on the list.

Sign Up For the Art&Colour Launch

“You want to come home and feel joy”

-Siobhan Casey

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