Business Details
24 Years
experience
Trusted Architects for Healthcare & Commercial Projects
Established in 2002, we are a multidisciplinary architecture practice with a diverse portfolio spanning healthcare, commercial, and residential sectors. Our reputation is built on repeat client collaborations and referrals, reflecting our commitment to quality service and project success. We deliver tailored designs across the UK, with particular expertise in London, Oxfordshire, the Midlands, and Scotland. Our approach prioritises understanding client needs, combining creativity with practicality to produce functional, aesthetically pleasing spaces. With offices in Central London and Bicester, our team provides architectural and interior design services across all project stages.Recognised through industry awards and testimonials, we maintain a collaborative process to ensure client satisfaction. Our depth of experience enables us to navigate complex challenges while delivering innovative solutions aligned with client objectives. We integrate technical expertise with environmental considerations to create sustainable, user-focused environments. Client testimonials highlight our professionalism, problem-solving skills, and ability to exceed expectations. Our partners and associates bring specialist knowledge across healthcare, listed buildings, and mental health architecture, ensuring comprehensive service delivery.
Services
Healthcare Architecture
Commercial Architecture
Residential Architecture
Listed Buildings
Mental Health Design
Interior Design
Project Management
Conservation Architecture
Sustainable Design
Urban Regeneration
Details
- Year established: 2002
Highlights and features
- 20+ years' experience across healthcare, commercial & residential architecture
- Award-winning designs with industry-recognised expertise
- Tailored solutions for London, Midlands & Scotland markets
- Proven collaborative process with 95% client retention rate
- Specialist knowledge in listed buildings & mental health facilities
What people say
Inventive yet practical use of space
Exceptionally lovely people to work with
Excellent outcomes for healthcare projects
Proactive problem-solving approach
Deep understanding of client needs
Services
Healthcare Architecture
Specialist healthcare architecture with proven expertise in hospitals, clinics, and rehabilitation facilities. Our team delivers functional, patient-centric environments that meet clinical requirements while maintaining aesthetic quality. With over 20 years' experience, we understand the unique demands of healthcare projects, ensuring compliance with sector-specific regulations and accessibility standards.
Commercial Architecture
Tailored commercial architecture solutions for office spaces, retail units, and mixed-use developments. We create modern, efficient environments that enhance business operations while maximising property value. Our approach balances practicality with innovative design to deliver spaces that support contemporary working practices and tenant requirements.
Residential Architecture
Comprehensive residential architecture services for private homes, apartment blocks, and housing developments. We focus on creating comfortable, sustainable living spaces that respond to both client needs and environmental context. Our expertise includes period property renovations and modern new-build projects across the UK.
Listed Buildings
Specialist conservation architecture for listed buildings and conservation areas. We combine historical sensitivity with modern functionality, ensuring preservation of architectural heritage while meeting contemporary usage requirements. Our team has extensive experience in sensitive restoration projects across London and the South East.
Mental Health Design
Therapeutic environment design for mental health facilities and wellbeing centres. Our approach prioritises user comfort, safety, and accessibility while creating calming, supportive spaces. We incorporate evidence-based design principles to enhance patient outcomes and staff efficiency in specialist healthcare settings.
People
Cressida Toon
Partner
With over 20 years' experience in architectural design, Cressida specialises in healthcare projects. She leads complex hospital developments, combining technical expertise with patient-centric design principles to deliver award-winning medical facilities across the UK.
Gary Toon
Partner
Gary brings extensive commercial architecture experience, focusing on office developments and urban regeneration projects. His expertise in listed building conservation ensures historically sensitive yet functional modern adaptations for London's heritage properties.
Agata Zamasz
Partner
Agata specialises in residential architecture, managing high-end private home projects and mixed-use developments. With a focus on sustainable design, she delivers innovative solutions that balance aesthetic appeal with practical living requirements across the UK.
Tim Bennett
Partner
Tim leads mental health and wellbeing architecture projects. His expertise in therapeutic environments ensures designs that support clinical outcomes while maintaining architectural integrity across specialist healthcare facilities nationwide.
Giulio Cesare Ghermandi
Associate
Giulio specialises in conservation architecture, working on Grade I and II listed buildings. His technical knowledge ensures historically accurate restorations while implementing modern functionality for London's heritage properties.
Questions
What architectural sectors do you specialise in?
We focus on healthcare, commercial, residential, and conservation architecture, with additional expertise in mental health facility design.
How long has your practice been established?
Sonnemann Toon has operated since 2002, delivering award-winning projects across the UK for over two decades.
Which geographical areas do you cover?
While based in London and Bicester, we deliver projects nationwide with particular strength in London, Oxfordshire, the Midlands, and Scotland.
What makes your practice different?
Our client-centric approach combines creative design with practical problem-solving, evidenced by 95% client retention and numerous industry awards.
Can you handle listed building projects?
Yes, we have specialist conservation architects with extensive experience in Grade I/II listed property renovations and heritage area developments.
How do you ensure project success?
We maintain collaborative processes with clients and consultants, supported by technical expertise and rigorous project management from concept to completion.
