We are passionate about creating exceptional public and private spaces that reflect your vision and taste. As a high end interior design company that has been working with commercial and residential clients from London to Sussex for 10 years, the personal connection we have with our clients is just as important as the final aesthetic. You can expect nothing short of a tailored, bespoke interior design service, so your journey to your dream interior space will be an enjoyable experience. We truly believe that interiors can speak volumes about a person or a brand, full of the small touches that make unique stories come to life. With the right balance of beauty, function and personality, our holistic range of interior design services will result in a timeless design that you will love for years to come.

Our interior design company takes a collaborative approach on all aspects of a project. Taking into account your needs and preferences, we will create a concept that you are delighted with, before selecting items and materials that align with the vision. We understand the uniqueness of each project, and our work truly reflects this.



While being flexible to your needs, our process follows a three-step framework, from concept through to completion. Starting with the initial brief, we will create a design concept with your approval, before finalising materials, designing development drawings, and final decisions. Our interior designers will take the time to refine and fully develop each concept before taking action. We create specific plans for all aspects, including electrics, lighting, furniture and floor layouts, before working with a trusted network of contractors located wherever you are, from London to Sussex.



I worked with Jonathon to deliver the refurbishment of the common parts of Cumberland Mansions, a large apartment building in central London. I found him extremely professional and creative and able to work within the budget restraints. The work is now complete, and the residents are delighted with the results.
– Lady June Diley

We have worked with Jonathan on various projects and have always found his work to be of a very high quality. He has a fantastic eye for matching colour schemes and design ideas, with a great attention to detail. We look forward to working him with plenty more collaborations in the future.
– Robert Stewart

We worked closely with Jonathan to bring a clients project to life and was extremely impressed with his design flair, professionalism and project management capabilities. Would highly recommend Jonathan Sethna Interiors in the future.
– Joshua Delane

Jonathan has produced some amazing designs for us and has helped transform blocks of flats in the process. We and our clients have always been extremely happy with the end results. Highly recommended.
– Danny Weil

I used Jonathan Sethna Interiors on a residential project. Jonathan was personable and always at hand to answer any questions I had. Due to a busy workload I gave them complete control and he really did bring my vision to life. Thanks!
– Stacey Freeman

JS Interiors have been excellent! They were prompt in getting back to me from initial call and has maintained great communication throughout the project. I had no knowledge/understanding of interior design, but Jonathan was able to work with me and enable my ideas to come to life!
Jonathan has been informative and always available to support when required. I would highly recommend JS Interiors and would definitely use them again, if and when, required.
– Marie Bartlett

Such a lovely experience. Great communication, attention to detail and overall excellent service & delivery!
– Jason Foster

Have had the pleasure working alongside Jonathan on various projects and his design and attention to detail is spot on .. will work within a budget that your happy with & will give the same service and work ethic with each project . Wants clients to achieve an end goal that he’s happy to put his name too and your happy with the project end result.
– Tony

Have worked with Jonathan in a couple of projects in the last year and surely I can’t recommend him enough as a talented and down to earth designer, it’s hard to find great designers that processed both of these qualities and he is one them, he’s honestly a joy to work with.
– Johanna Flores

Very talented, highly experienced interior designer with good ideas and impressive designs, who delivers an elegant and high class product together with a practical and professional approach throughout.
– Tony Sasha

I had the honour of working with Jonathan on a commercial project and was enchanted by his good taste and talent!
Jonathan is a very competent person, easy to deal with and understanding, in addition to being an excellent professional.
– Gaby Rodrigues

Working with Jonathan on many projects has always proven to be easy-going with regards to design aspects, friendly and finalizes on a quality finish.
– Darren Cooke

To make an enquiry about any of our high end interior design services, or to book an initial consultation, please reach out to our Sussex based team using the contact form here.


For inspiration, expert advice, and a behind-the-scenes look at some of our projects, take a look at our blog page. We hope you get some ideas for your upcoming interior design project.

Project Portfolio

Be inspired by our most recent luxury interior design projects completed in Surrey, London and beyond. With a mixture of commercial and residential spaces, including restaurants and offices, we create an unforgettable interior.