About Callender Howorth

Callender Howorth offers tailored architectural interior design, build, renovation and project management services to both residential and commercial properties throughout the UK, Europe and North America. Our dedicated team of award-winning interior designers, interior architects, stylists and project managers deliver innovative and bespoke solutions to each of our clients.

Mark Howorth | Callender Howorth | Luxury Interior Design

Meet the founder

Meet Mark Howorth, an award-winning interior designer, who is considered by many to be one of the best interior designers in London.

Mark started his career living and working in Los Angeles designing high end residential projects throughout LA and Southern California. He then moved back to London and founded Callender Howorth in 1997. Callender Howorth has grown since then to design and manage projects throughout the UK, the South of France and Manhattan. The core design team, based in London, covers all aspects of Interior and Architectural Design and Project Management.

Callender Howorth has been recently attributed with a finalist spot at the prestigious SBID International Design Awards in the ‘Residential Project under £1m’ category.

The awards were created to recognise, reward and celebrate luxury interior design projects across a broad spectrum of categories and so it is a fair representation of our quality workmanship.

Meet some Clients

Devonshire Mews, London, was a breathtaking project that echoed the inspirations of the clients in their own personal space. Callender Howorth worked with the owners on every-last exquisite detail.

Many visions were fulfilled during the completion of this non-archetypal London abode. The team worked with the clients to provide a sense of a charismatic living quarter. Each client’s wishes are different in every plan, our aim is to bring the client’s idealistic qualities to life, making each result profound and thoughtful.

We project managed this property in order to bring a utopian finish and detailed format to suit the client’s principle conceptions from start to finish.

What we do

We don’t have a “house style” as luxury interior design is personal and specific to each of our clients and their families. Each of our projects is unique and completely customised for each client in line with their style, aspirations and lifestyle.

  • Briefing

    Developing trust, sharing ideas, and establishing a positive connection to you and the project at hand through open and friendly discussion is the starting point for any project we carry out.

    During the briefing stage we will have a series of exploratory conversations, listen carefully to your ideas, inspirations and practical requirements, and begin to introduce our own responses and suggestions by showing you a range of visual references and examples.

    The briefing phase allows us to sketch out and communicate to you our initial design concepts, articulating a shared vision for the project. It’s relaxed and informal but always structured to ensure we move forwards in developing a clear initial project plan. It is also a time to respond to any questions and concerns you may have about the process, and to root out any practical considerations or issues that will affect the planning.

  • Interior Architecture

    We work through complete architectural schemes, from the initial design concepts and planning consultations through to complete interior design packages. With extensive experience dealing with Listed properties, we are able to co-ordinate complex projects in line with Listed buildings, English Heritage and the Planning departments.

    Every inch of the property is given careful consideration and our approach takes into account the allowances that might pertain. The quality of such purposes sees no restrictions, but permits a basis for the perfect finish.

    Our dynamic team endeavors to interpret and work in line with a perfectly succinct guidance from the client. Our experience allows us to develop your expectations to an unmatchable high standard.

  • Interior Design

    At Callender Howorth, we design for residential and commercial sectors, creating exceptional apartments, houses and offices worldwide.

    Our interior design services are diverse and include interior architecture, interior design, furniture and lighting design. We meticulously work to provide an articulate service with every project.

    We ascertain every client’s desire to make their property a space where they may feel serene and at home. Insightfully, we focus on how we can promote a wellbeing culture behind every wall, fixture and fitting. The interior design reflects a perfect footing on our understanding of a client’s wishes.

  • Interior Styling

    Our award-winning styling team sources furniture, art and objects from worldwide suppliers. Working with established and the latest and most innovative suppliers and artisans.

    Once the construction and fit-out is finished, and all furniture and fittings delivered, our interior design services centre upon styling.

    We will dress and furnish the completed fit-out using art, sculptures, linens, floral displays, tapestries, dinnerware and a range of other interior products to provide the finishing touches to your design.

    This final stage of work is absolutely critical to the success of the overall project and to your own happiness with the end product. It is the finessing and adding of finishing touches to the fully realised design, and the completion of the vision that we explored together during our very first meetings at the outset of the process.

  • Concept Designs

    We will develop early ideas by presenting you with a range of practical examples and references.

    These may include visual scrapbooks, site visits, and palette ideas for construction materials, colours and fabrics. We’ll also introduce ideas for furniture and styling, and explore layout through detailed sketches and illustrations, 3D modelling, elevations, and computer-generated walkthroughs.

    Ongoing discussion and feedback from you is especially crucial in this consolidation phase of our interior design services, bringing together our shared ideas into practically workable examples and a defined strategy that will guide the remaining phases of work.

  • Concept Agreement & Detailed Design

    There is an opportunity for final tweaking and detailed review before the look of the project is fully defined and agreed.

    We use your feedback to refine the design ideas we have developed into a single unified concept and design scheme for your sign-off.

    The result is the production of a single set of detailed designs, including reference images, elevation drawings, layout plans, agreed furniture, finishes and material palette, and a comprehensive set of computer-generated drawings. This detailed design then lets us finalise the scope of works and construction project plan, and to manage the procurement process that follows.

  • Design & Build

    As part of our interior design service, we select and bring together the team who will deliver the full project to completion, managing a tendering and procurement process that ensures maximum value, exceptional quality of materials and exemplary craftsmanship.

    We project manage all construction and oversee production of any bespoke interior design processes and contracts for custom furniture, furnishings, fittings or specialist supplier.

    Throughout the entire project build, from fabrication to construction to fit-out, we closely monitor all contractors and suppliers and carry out regular site visits, ensuring that clear quality checks are in place at every stage of the process. We work closely with all disciplines involved in the construction phase to ensure that the critical path to completion remains clear and crucially that the project delivery continues to be achieved to time and budget, keeping you regularly informed of progress and key milestones.

  • Project Management

    As part of our interior design service, we select and bring together the team who will deliver the full project to completion, managing a tendering and procurement process that ensures maximum value, exceptional quality of materials and exemplary craftsmanship.

    We project manage all construction and oversee production of any bespoke interior design processes and contracts for custom furniture, furnishings, fittings or specialist supplier.

    Throughout the entire project build, from fabrication to construction to fit-out, we closely monitor all contractors and suppliers and carry out regular site visits, ensuring that clear quality checks are in place at every stage of the process. We work closely with all disciplines involved in the construction phase. This is to ensure that the critical path to completion remains clear and crucially that the project delivery continues to be achieved on time and to budget, keeping you regularly informed of progress and important objectives.

Get in Touch

If you have a project or interiors idea you would like to discuss with the Callender Howorth team, we’d be delighted to hear from you. To arrange a private appointment, or schedule a time to view and chat through our portfolio of completed projects please contact our London interior design company.