Business Details
29 Years
experience
Luxury Interior Designers in London
Established in 1997, we are a leading international luxury interior design practice with a 25-year legacy of delivering exceptional residential and commercial projects across London, Paris, the Cote d'Azur, New York, and Los Angeles. Our award-winning multidisciplinary team specialises in interior architecture, bespoke design, and comprehensive project management, ensuring every client benefits from a seamless end-to-end experience. With expertise in listed property restoration, contemporary country houses, and state-of-the-art penthouses, we combine creative vision with meticulous execution to transform spaces into timeless sanctuaries. Our approach begins with collaborative briefings to understand client aspirations, followed by concept development, material selection, and hands-on project oversight.We maintain strong relationships with global artisans and suppliers to source unique furnishings, while our English-speaking build teams in Europe and North America ensure cultural and logistical expertise. From initial design concepts to final styling touches, we prioritise quality craftsmanship, innovative solutions, and client satisfaction. Our portfolio demonstrates our ability to balance artistic expression with practical functionality, creating spaces that reflect individual lifestyles and heritage. With offices in London and New York, we serve discerning clients seeking tailored luxury environments worldwide.
Services
Interior Architecture
Interior Design
Project Management
Interior Styling
Concept Designs
Residential Design
Commercial Design
Renovation
Furniture Design
Lighting Design
Details
- Year established: 1997
Highlights and features
- We have 25 years of experience in luxury interior design and architectural projects
- Our multidisciplinary team includes award-winning designers and project managers
- We provide complete project management from concept to final styling
- We operate internationally with English-speaking teams in Europe and North America
- Our bespoke approach ensures designs reflect each client's unique lifestyle and vision
Services
Interior Architecture
We specialise in comprehensive architectural schemes for residential and commercial properties. Our expertise includes working with listed buildings, coordinating complex projects with heritage authorities, and delivering tailored solutions that balance creative vision with regulatory requirements. Our approach ensures every space achieves both aesthetic excellence and functional integrity through meticulous planning and execution.
Interior Design
Creating exceptional private estates, penthouses, and commercial spaces worldwide forms the core of our practice. Our services encompass interior architecture, furniture design, and lighting solutions tailored to client lifestyles. We focus on promoting wellbeing through thoughtful spatial planning, material selection, and bespoke finishes that transform properties into serene, personalised environments.
Project Management
Our comprehensive project management covers tendering, procurement, and construction oversight. We assemble expert teams to ensure quality craftsmanship, material excellence, and timely delivery. Through regular site visits and rigorous quality checks, we maintain clear communication with clients while managing contractors to achieve projects on schedule and within budget across international locations.
Interior Styling
Our award-winning styling team sources furniture, art, and decorative elements from global suppliers to complete interior schemes. We specialise in final dressing with bespoke textiles, sculptures, and curated objects that enhance the design narrative. This critical phase transforms completed builds into fully realised, emotionally resonant spaces that reflect client personalities and aspirations.
Concept Designs
We develop initial ideas through visual references, 3D modelling, and detailed sketches that evolve into unified design schemes. Our process includes material palettes, furniture selection, and spatial planning refined through client collaboration. This phase establishes the foundation for successful project execution by aligning creative vision with practical implementation strategies.
People
Mark Howorth
Founder
Award-winning interior designer Mark Howorth established the practice in 1997 after working in Los Angeles. Recognised as one of London's leading designers, he oversees projects across the UK, Europe, and North America. His expertise spans luxury residential and commercial design, with a particular specialism in heritage property restoration and contemporary architectural integration.
Questions
What areas do you serve?
We operate across the UK, Europe, and North America with offices in London and New York. Our English-speaking teams work in Paris, Cote d'Azur, and the Hamptons, delivering projects from concept to completion.
What types of projects do you handle?
We specialise in luxury residential and commercial interior design, including listed property restoration, contemporary country houses, penthouses, and bespoke furniture design. Our services cover full architectural schemes and complete project management.
How do you approach client collaboration?
We begin with exploratory briefings to understand client aspirations, followed by concept development and material selection. Through regular updates and hands-on project oversight, we ensure designs evolve to meet individual lifestyle needs and practical requirements.
What makes your service unique?
Our multidisciplinary team combines creative design with technical expertise, offering seamless project management from initial concept to final styling. With 25 years of experience and international teams, we deliver tailored luxury solutions that balance artistic vision with practical execution.
Reviews (4)
Alena Verevkina
Sep 19, 2018
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Mark and his team are amazing! They are effective, efficient and they really listen to every request we have. Truly top luxury interior designers !!
Divita Raja
Oct 18, 2016
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Having just moved into our recently designed and renovated place in Nice I just want to say how effortless Callender Howorth made the design and renovation process. We loved the fact that we just were handed the key back and everything was ready for us to move in and use as our holiday home a real heartfelt thank you from me and the family.
Kate Snesareva
Jun 28, 2016
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I recently worked with Mark and his team to redecorate our apartment in Monaco. I couldn't be happier with the results. I felt super comfortable talking with the Callender Howorth team about my ideas, which they took into consideration to come up with a solution that suited my taste and budget. Working with their team turned out to be an incredibly smooth and creative experience. They stayed within the budget and schedule. I highly recommend Mark and the Callender Howorth team and plan to use them again.
Sue Corner
Oct 19, 2013
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After approaching a number of Interior Designers, we chose Callender Howorth Interiors; and can recommend them highly. They created an absolutely stunning interior for our London apartment, with a great eye for detail. The range of services that they provided was comprehensive and thorough - creative bespoke furniture, specialist kitchen design, wonderful lighting solutions, and the latest audio/visual throughout (that my husband is thrilled with!)
Mark Howorth and his team also provided a beautiful furnishing scheme, offering an extensive range of fabrics, wallpapers, rugs and styling objet.
Mark Howorth and his team also provided a beautiful furnishing scheme, offering an extensive range of fabrics, wallpapers, rugs and styling objet.
