Based in London, our portfolio demonstrates our capability in healthcare, commercial and residential projects. Since 2002, our premise has been to provide thoughtful designs that respond to the needs of our clients in every respect. We analyse their requirements, be they aspirational, organisational or financial, and translate these, through a well managed and collaborative process,into built projects.

Our depth of understanding and years of expertise ensures that designs are tailored to produce spaces that are visually pleasing, acoustically and environmentally comfortable as well as being functional. This results in buildings that are enjoyed by their occupants and that are successful in the long run.

We are committed to delivering an exceptional service both in terms of quality and speed. The rigorous application of our Quality Assurance system together with a commitment to staying at the front of the field in terms of the use of IT, allows us to deliver all stages of projects efficiently and thoroughly. We remain directly involved in all stages of project work. Together with our team of architects and assistants we offer a dynamic, flexible and efficient response to every project.


Gary Toon
BA (Hons) DipArch RIBA

ARB registered architect 1993, RIBA member

Cressida Toon
BA (Hons) DipArch MA Cantab RIBA

ARB registered architect 1997, RIBA member


Agata Zamasz

Anna-Marie Lutterodt
BA (Hons) DipArch

David Wright
BBdgA MArch PRArch

Timothy Bennett
BA(Hons) DipArch

Julija Kovaljova
Practice Manager
BA(Hons) Business Management

Ilona Kovaljova
Administrative Assistant
BA(Hons) Business Management

Claire Matthews
Graphic Designer
BA Graphic Design

Cathryn Crisp
Senior Architect
BA(Hons) DipArch

James Adewale
BSc(Hons) Prof DipArch

Jolien Langford
Architecte d.p.l.g. (Fr)

Laura Massey

Marta Losada Puente
BA (Hons) DipArch

Shane Murphy
MA Architecture

Mitko Pavlov
Architectural Technician
BA Architectural Technology

Agnieszka Drankowska
Architectural Assistant
MSc Arch

Cecilia Bechis
Architectural Assistant

Christina Laity
Architectural Assistant
Adv.Dip BldgDes

Federico Lacabaratz
Architectural Assistant
BAS Arch. (UK) – Arquitecto (Arg)

Hsien Lim
Architectural Assistant

Galina Borovikova
Architectural Assistant
BSc MSc MArchD

Gavin Jones
Architectural Assistant
BSc BA (Hons) MArch

Gilberto Viegas Junior
Architectural Assistant
BArch DipArch

Gina Gallaugher
Architectural Assistant

Kasia Hulkkonen
Architectural Assistant
MSc Arch


“We have worked closely with Sonnemann Toon Architects in designing a number of wards and other health facilities. The practice has understood our requirements, has been very easy to work with and have come forward with helpful suggestions and insights during the course of the projects.”

Michael McGhee
Service Director, East London NHS Foundation Trust


"Sonnemann Toon is now the preferred lead design consultant in our project teams. Their design capability is excellent but of equal importance is their management of technical and administration matters which is first class. As lead consultant they are proactive in coordination with other designers, planners, building control and the like. They have demonstrated the ability to work to tight programmes and still produce high quality designs and documentation. On site they work well with Contractors and are imaginative when it comes to problem solving."

Peter Bevis
Director, Nexus Project Management


"Sonnemann Toon punch well above their weight in delivering architectural and project management services. Their design expertise and understanding of client needs and the design build process, contribute to providing a service that many larger practices would aspire to. The involvement and commitment of their partners and staff on every project has always resulted in very successful outcomes."

Martyn Flowers
Design Director, Skanska


"We achieved handover of our project some twelve weeks early which was in no small part due to the ability of Sonnemann Toon Architects to identify and mitigate design risks early in the design programme and on account of the completeness of the information they provided."

Mick Laws
Operations Director, Galliford Try


"Sonnemann Toon Architects have been leading a number of capital projects for us over the years and have always proven to be a highly efficient and innovative project partner. Their attention to detail and understanding of our business is exemplary and always contributed to the successful conclusion of the projects carried out. It is a pleasure to recommend STA without reservation."

Frank Riedel
Capital Projects Manager


"Always attentive, listening properly and contributing good insights from wide experience and knowledge we have achieved excellent outcomes for our healthcare projects using Sonnemann Toon Architects. Their design services are delivered very positively and with flare, caring as much about our programme as the quality of the scheme. They have integrated well with our team and other consultants, providing flexible and reliable professional advice always."

Keith Hague
Capital CEO of Healthcare Corporation of America Wellington Hospital


"We have worked with Sonnemann Toon Architects on a number of projects and have been impressed by their ability to listen and understand the vision/goal, take it way and interpret it in a practical realistic way. They are always professional and helpful and their ability to think ways around potential obstacles has been enormously helpful . I would have no hesitation in recommending them."

Charlotte Tempest
Chief Executive Officer, The Princess Grace Hospital


"Over a growing number of schemes we have come to expect design flair and technical control from Sonnemann Toon; from award winning mews houses to highly complex medical environments in listed buildings. We’ve enjoyed consistent performance delivered in a professional and friendly manner that has culminated in results that we are all extremely proud of."

James Fisher
Building Projects Director, Howard de Walden Management Limited


"Perceptive in identifying flexible solutions for the future and deliver a service in a positive, structured and effective manner."

Mr Bobby Qureshi, BSc MBBS FRCS (Ophth.)
Consultant Ophthalmic Surgeon & Medical Director London Eye Hospital


"Sonnemann Toon Architects provided not only concept and detailed design input but were also very positive, flexible and knowledgeable and demonstrated great expertise in problem-solving and developing the brief with us - giving us excellent and reliable professional advice - this has been invaluable."

Bill Preston
Project Manager, Private Healthcare Provider


"We have worked with Sonnemann Toon on a number of healthcare projects. They always ensure that they fully understand what we need and never fail to amaze me with their inventive ,yet practical , use of our space. As a bonus they are exceptionally lovely people to work with. Always my architects of choice!"

Elaine Head
Senior Project Manager, The Wellington Hospital


"Thank you for all the hard work and all the support you have given me throughout the projects. Nothing was ever too much trouble. As a result we have the most incredible consulting rooms and reception, way beyond what I could have imagined. Thank you."

Ruth Allgood
Facilities Manager, Spire Cambridge Lea Hospital


"Sonnemann Toon were appointed to design a new entrance, reception and back office facilities for a tired and uninspiring office building on Tottenham Court Road. Drawing inspiration from the area’s ‘hi-fi heritage’ they came up with a striking and distinct design for the entrance and reception and very ‘current’ ideas for the WC’s, shower and changing facilities. Sonnemann Toon showed great attention to detail in their work and worked very hard to see the project through to a successful conclusion. I was very impressed with their overall effort."

David Hughes
Director, Alchemy Asset Management Limited


"Sonnemann Toon listened to our needs- Their professionalism, knowledge and attention to detail have created a beautiful, functional environment for our patients. A great team to work with - Thank you!"

Clare Sullivan
Head Of Outpatient Services, The Harley Street Clinic


Winner of Build Architecture Awards 2016
– Best in Healthcare Architecture 2016 - Southern UK

Winner of UK Property Awards 2016
– Architecture Single Residence
– Office Architecture

Finalist of AJ Retrofit Awards 2016
– Listed Building Category
– Office Architecture
– Retrofit House Category

Winner of UK Property Awards 2015
– Office Architecture
– Public Service Architecture

Winner of Build Architecture Awards 2015
– Best for Public Service Architecture

Highly Commended in Building Better Healthcare Awards 2015
– Best Internal Environment

Shortlisted in AJ Retrofit Awards 2015
– Health Category
– Offices under 2000sqm Category

Shortlisted in SBID International Design Awards 2015
– Healthcare Design
– Office Space Category

Winner of Building Better Healthcare Awards 2014
– Clinician's Choice Award

Winner of UK Property Awards 2014
– Best Public Service Architecture East of England

Highly Commended in UK Property Awards 2014
– Architecture Single Residence London

Winner of Building Better Healthcare Awards 2012
– Clinician's Choice Award

Shortlisted in Building Better Healthcare Awards 2012
– Best Project Team
– Best Out-of-Hospital Care Facility Design

Shortlisted in Partnership Awards 2012
– Best Designed Project
– Best Sustainability in a Project

Shortlisted in RICS Awards 2012
– Design & Innovation
– Community Benefit

Shortlisted in Building Better Health Awards 2011
– Best Patient Environment
– Best Acute Design

Finalist in Healthcare Architect of the Year Award 2010

Winner of Building Better Health Awards 2007
– Best Interior Design

Highly Commended in Building Better Health Awards 2007
– Best Landscape

Shortlisted in Building Better Health Awards 2007
– Best Primary Care Design


Click to download practice profile (PDF)

Click to download partner and team details (PDF)

Click to view our Anti-Slavery and Human Trafficking Statement (PDF)