We operate as a RIBA Chartered Architecture practice committed to delivering distinctive, client-focused residential architecture. Since our founding in 2010, we have built a strong reputation across London and the South East for creative design and professional rigour. Our work is centred on the high-end residential sector and includes one-off homes, new-build developments, refurbishments, extensions, basements and loft conversions. By working closely with our clients, we ensure that every project reflects individual requirements while achieving a refined architectural outcome.
Our architectural services are comprehensive and carefully structured. We commence each commission with concept development and detailed measured surveys, producing accurate drawings and design options. We prepare planning applications and manage discussions with local authorities to support a smooth approval process. To enhance understanding of proposals, we offer internal and external 3D visualisations. Our technical services include detailed construction information, coordination with building control and specialist consultants, and interior architecture with full specifications and FF&E. We also manage tendering, advise on contractor selection, and administer contracts on site, overseeing construction quality through regular inspections and clear communication.
Our architectural services are comprehensive and carefully structured. We commence each commission with concept development and detailed measured surveys, producing accurate drawings and design options. We prepare planning applications and manage discussions with local authorities to support a smooth approval process. To enhance understanding of proposals, we offer internal and external 3D visualisations. Our technical services include detailed construction information, coordination with building control and specialist consultants, and interior architecture with full specifications and FF&E. We also manage tendering, advise on contractor selection, and administer contracts on site, overseeing construction quality through regular inspections and clear communication.
Details
- Year established: 2010
- Licensed
Highlights and features
- Award-winning studio delivering bespoke architectural solutions
- RIBA Chartered practice with established industry credentials
- Extensive experience in high-end residential architecture
- Comprehensive service from concept design to completion
- Specialists in extensions, basements, and loft conversions
Payment methods
- Cash
- Debit cards
- Credit cards
Services
We are a RIBA Chartered practice established in 2010, bringing over 15 years of experience in residential architecture. Our work demonstrates a focused expertise in delivering high-quality homes. We maintain rigorous professional standards throughout every commission. Client satisfaction and carefully resolved design outcomes underpin our approach. 
We specialise in designing rear extensions that create generous, light-filled spaces for modern living. Our approach combines creative architectural thinking with a clear understanding of planning policy and construction regulations. From open-plan kitchens to flexible family areas, we ensure each extension integrates seamlessly with the home and improves functionality. 
Our studio specialises in the considered design of basement extensions that enhance both space and value within residential properties. We guide each project from initial concept through to completion, ensuring elegant solutions, effective use of natural light, and full compliance with complex planning, building, and conservation constraints. 
Our flat conversion service focuses on unlocking the full capacity of residential properties through considered architectural design. We manage complex planning frameworks, technical specifications, and design development to ensure efficient delivery. By tailoring each conversion to the buildings character and constraints, we create well-resolved, high-quality living environments. 
House renovation allows us to redefine how a home functions and feels. We approach each project as an opportunity to enhance usability, update interiors, or sensitively restore original character. In Londons diverse housing landscape, informed planning is essential. Our studio delivers carefully considered renovations, shaped by experience, precision, and a clear understanding of each clients aspirations. 
Our loft conversion service is delivered through a considered architectural approach that balances creativity with technical precision. We oversee the process from early assessment and planning strategy to comprehensive drawings and on-site support. Each project is designed to integrate seamlessly with the original property, ensuring clarity, compliance, and lasting quality.
Reviews (9)
Pavel Ollitervo-Murphy
Dec 21, 2026
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Rebecca W.
Apr 08, 2026
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Tessa Irwin
Oct 17, 2025
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Michael Van Ree
Sep 14, 2024
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John and his team have been brilliant to work with for our full house renovation and extension in SW London. Our house is quite unique and that combined with it being in a conservation area we knew it wouldn't be a straight forward planning process - but Armstrong Simmonds did a fantastic job and helped us navigate us through every step. We couldn't be happier with the detailed design and outcome.
Teodor Perfanov
Aug 25, 2022
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Having worked with Armstrong Simmonds Architects on various residential projects I can highly recommend them. Their team understands the clients needs and ensures that the project runs smoothly. It is extremely beneficial working with technically competent architect that leads the desgin process and delivers well thought final product
Neil H. -R.
Jun 21, 2022
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Armstrong Simmonds Architects fully understood our brief when we were redesigning our property. They quickly understood what we were looking for and fully met the brief. We were delighted with the result and cant recommend them highly enough for their professionalism, creativity and attention to detail.
Jj Skrine
Oct 14, 2020
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John and Nick from Armstrong Simmonds did a great job stretching some plans we brought them and helping us navigate the tricky planning process to deliver our best project yet. They were extremely user friendly, reliable and efficient. Johns integrity when we realised we'd initially selected the wrong builder really stood out and enabled us to partner up with an exceptional builder who we would highly recommend to anyone else. Overall we had a great experience and would highly recommend Armstrong Simmonds again.
Rebecca Wheelhouse
Dec 28, 2019
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Linda Roberts
Nov 07, 2017
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Architects Armstrong Simmonds were appointed by us to turn our concept of open plan living into reality, which they did with extraordinary vision and design flair. The AS team listened carefully to our ideas and transformed an ordinary detached house into a breathtakingly beautiful home that offered light, space and a lifestyle that exactly reflected our needs and requirements . AS worked closely with us and our builder, and their focus to detail in the design and build was impressive. This young architectural practice in our opinion, offers something more. They listen, understand and are unique in their ability to conceptualise, plan and build with imagination, whilst considering aesthetics and functionality.
Linda and Allan Roberts
Linda and Allan Roberts