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. Since 2012, 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 interior design services include:

  • Space planning
  • Kitchen and bathroom design
  • Bespoke joinery
  • Lighting design
  • Furniture sourcing
  • Art curation
  • 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 quick fixes, 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 Bespoke Interiors

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

Every Casey & Fox project is different, but the way I approach them is pretty consistent. I listen carefully, ask a whole lot of questions, and make sure the end result feels like your home, not mine.

No Beige Regret
I’m not interested in creating a home that looks like everyone else’s. We’ll work out what you genuinely love, then use colour, pattern, art and the things you already own to create something that feels like you.

Art at the Heart
Art can completely change the feel of a room. If you already own pieces you love, I’ll make sure they work beautifully within the scheme. If you don’t, I can help you find the right pieces.

Calm in the Chaos
Renovations involve a lot of decisions. I’ll help you work through them in the right order, spot potential problems early and keep things moving when it all starts to feel a bit much.

Tailored, Not Templated
I don’t have a Casey & Fox “look” that gets repeated from house to house. Your home, your taste and the way you live are where we start.

Built to Last
I’d rather help you buy the right thing once than replace something in a few years. That means good materials, skilled makers and thoughtful choices that still feel right long after the decorators have packed up.

The aim is simple: a home that works properly, feels completely personal and makes you happy to walk through the door.

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

"Siobhan’s Design Hotline service was a real lifeline for us. I reached out during the design phase of a mixed-use development of studios and 1-bedroom apartments, with the challenge of maximising space, creating homely features, and keeping costs manageable so rents remain competitive. From the start, Siobhan made it simple to share our requirements and drawings. By the time of our session, she’d fully grasped the scheme and the specific needs of our future tenants. She came armed with a variety of solutions that will not only enhance the overall design...
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J Talbot, Manchester
"Siobhan’s Design Hotline service was a real lifeline for us. I reached out during the design phase of a mixed-use development of studios and 1-bedroom apartments, with the challenge of maximising space, creating homely features, and keeping costs manageable so rents remain competitive. From the start, Siobhan made it simple to share our requirements and drawings. By the time of our session, she’d fully grasped the scheme and the specific needs of our future tenants.She came armed with a variety of solutions that will not only enhance the overall design, but also reduce costs and simplify long-term maintenance. It’s refreshing to work with someone who genuinely understands the balance developers must strike between design impact, tenant experience, and financial realities. Siobhan’s ideas were creative, practical, and cost-sensitive - exactly what we needed. I would wholeheartedly recommend Casey & Fox to any developer working on studios, HMOs, or family accommodation. The service was swift, straightforward, and full of value."
J Talbot, Manchester
"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
"Behind the magic are truly amazing and exceptionally creative minds, bringing fresh ideas, innovative solutions, and a unique vision to every project. Their talent turns concepts into reality in ways that feel both effortless and extraordinary. Working with them is an inspiring and uplifting experience from start to finish."
Eli T, Sydney
"Behind the magic are truly amazing and exceptionally creative minds, bringing fresh ideas, innovative solutions, and a unique vision to every project. Their talent turns concepts into reality in ways that feel both effortless and extraordinary. Working with them is an inspiring and uplifting experience from start to finish."
Eli T, Sydney
"1-hour Design Hotline session was exactly the inspiration I needed to refresh my bedroom's design. We don't have a huge budget and we rent, so I wasn't looking for massive renovations, but I didn't know what I wanted.After signing up, I received a simple questionnaire that helped me clarify what I liked and didn't like about the room, and how our family used it. In our virtual Design Hotline session, Siobhan was so helpful; she shared many ideas and found potential, affordable local suppliers, even though we live in different countries.After the session, I felt really clear on ...
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L Stockley, Singapore
"1-hour Design Hotline session was exactly the inspiration I needed to refresh my bedroom's design. We don't have a huge budget and we rent, so I wasn't looking for massive renovations, but I didn't know what I wanted.After signing up, I received a simple questionnaire that helped me clarify what I liked and didn't like about the room, and how our family used it. In our virtual Design Hotline session, Siobhan was so helpful; she shared many ideas and found potential, affordable local suppliers, even though we live in different countries.After the session, I felt really clear on what I could do and how to use the space differently, in ways I would never have thought of, no matter how long I spent trawling through Pinterest! I'm implementing the ideas step by step as I find the right pieces. Siobhan's virtual consultation is such an effective and affordable way to change that room that always bugs you into a space you love!"
L Stockley, Singapore
"By word of mouth we met Casey and Fox. They understood really well what we were looking for. We were given several concepts to choose from and plenty of valuable advice. They were patient and managed to work around our busy schedule helping us making the right decision and sorting out problems for us. They made sure to create something wonderful, practical and at an affordable price"
C Benini, Leatherhead
"By word of mouth we met Casey and Fox. They understood really well what we were looking for. We were given several concepts to choose from and plenty of valuable advice. They were patient and managed to work around our busy schedule helping us making the right decision and sorting out problems for us. They made sure to create something wonderful, practical and at an affordable price"
C Benini, Leatherhead
"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
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
"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
" The Directors have asked me to pass on their thanks for all the work you have done on the refurbishment of 56 Vincent Square. We are all very pleased with the results and agree that it is a vast improvement. A number of people have commented very favourably on the redecorations and the Main Reception, in particular. The reception is a real transformation and much enhances the main entrance to our building. We wish you continued success with your business and once again, we appreciate the help and guidance you have provided to...
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Directors of the Residents Board, London SW1
" The Directors have asked me to pass on their thanks for all the work you have done on the refurbishment of 56 Vincent Square. We are all very pleased with the results and agree that it is a vast improvement. A number of people have commented very favourably on the redecorations and the Main Reception, in particular. The reception is a real transformation and much enhances the main entrance to our building.We wish you continued success with your business and once again, we appreciate the help and guidance you have provided to achieve a stylish and updated residence."
Directors of the Residents Board, London SW1

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

As featured in

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