As a creative and innovative architectural practice, we specialise in delivering carefully considered residential architecture that responds directly to our clients ambitions. Established in 2010 as a RIBA Chartered Architecture studio, we have completed a diverse portfolio of projects throughout London and the surrounding South East. Our team brings extensive expertise within the premium residential market, working on projects ranging from bespoke houses and apartment buildings to sensitive refurbishments, listed properties, basements, extensions and loft conversions. We remain closely involved at every stage to ensure each project is realised with precision and care.We provide a comprehensive architectural service structured to support our clients from inception to completion. Our process begins with detailed briefing, surveys and concept design, allowing us to explore multiple design possibilities. We manage planning submissions and ongoing liaison with councils, supported by our extensive planning experience. Visualisation through 3D modelling enables both clients and planners to fully understand proposals. We develop robust technical packages for building control approval, coordinate specialist consultants, and deliver high-quality interior architecture and design. Through tender preparation, contractor appraisal and on-site contract administration, we oversee delivery to maintain design intent and construction quality.
Business 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
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Services
As residential architects, we deliver considered architectural solutions shaped by extensive professional experience. Our practice has developed a strong reputation for maintaining exacting standards across all projects. We guide clients through complex planning and regulatory frameworks with confidence. Every commission is managed with professionalism, technical diligence, and a commitment to design excellence. 
Our rear extension services are focused on transforming ground-floor spaces into well-considered environments that support contemporary lifestyles. We guide clients through the entire process, balancing design quality with technical precision. By responding to site constraints and regulatory frameworks, we deliver elegant solutions that maximise space, daylight and connection to the garden. 
We design and deliver bespoke basement conversions that transform overlooked lower levels into refined, light-filled living spaces. Our practice combines creative vision with technical expertise to create bedrooms, living areas, cinemas, and kitchens that integrate seamlessly with the existing home while responding carefully to planning and regulatory requirements. 
We provide a comprehensive flat conversion service that balances design quality with practical execution. From initial concept through to detailed coordination, we address planning policies, building regulations, and spatial optimisation. Our experience with varied residential building types allows us to deliver conversions that are both compliant and thoughtfully designed. 
Renovating a property enables us to unlock its full potential while respecting its existing qualities. Our work focuses on improving layouts, refreshing tired spaces, and preserving architectural features where appropriate. Given the complexity of London planning requirements, professional guidance is vital. We provide high-quality house renovations that respond intelligently to both the building and the people who live within it. 
We provide tailored loft conversion solutions that enhance space, comfort, and long-term value within the home. Our practice manages each stage, from initial feasibility and planning guidance through to detailed design and construction oversight. Every scheme is carefully developed to respect the existing building while delivering a refined, functional living environment.
Reviews (9)
Pavel Ollitervo-Murphy
Dec 21, 2026
Daniel Gabbay
Apr 12, 2026
We received excellent advice when refurbishing a four bed house, including carrying out a wrap around extension to the kitchen area, proposing some very attractive and clear ideas. As a company they were very good with communication throughout the whole planning and building process.
Overall, very happy and wouldn't hesitate to recommend them to anyone
Overall, very happy and wouldn't hesitate to recommend them to anyone
Michael Van Ree
Sep 14, 2024
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.
Jason Collins
Jun 20, 2024
Jon
Sep 05, 2023
Jj Skrine
Oct 14, 2020
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
Giles Ritchie
Aug 13, 2019
We appointed Armstrong Simmonds Architects following a competitive tender to remodel and extend a Victorian terraced house in Southfields. We worked closely with John Armstrong on the initial designs and the planning considerations. Surveying of the existing property was swiftly conducted and the team were very proactive in the management of our planning applications which were granted with no amendments. Although we only specified a basic drawings package our builders and those that tendered for the project were complimentary on the detail and thoroughness of the plans. John also made himself available to discuss issues during the build which has been extremely helpful.
I would recommend asking to see practical examples of what is included at each price point to ensure expectations are clear on what is included.
In addition we have appointed Armstrong Simmonds Architects to produce drawings and manage the planning application for garden gym building and will likely work on additional projects with John and the team.
I would recommend asking to see practical examples of what is included at each price point to ensure expectations are clear on what is included.
In addition we have appointed Armstrong Simmonds Architects to produce drawings and manage the planning application for garden gym building and will likely work on additional projects with John and the team.
Haroun Lalji
Jan 16, 2018
As a small developer I felt that Armstrong Simmonds filled the brief extremely well. I appointed Armstrong Simmonds in 2012 after vetting several other similar architectural firms. What struck me at the time was the range of expertise within the firm, but also their ability to negotiate the often difficult passage of the planning process, but also some very useful contacts to the table. They have worked on several plans for me and are capable of bringing to fruition not only the plans, but also careful attention to details, architectural features, along with much needed sage advice. Their costings are reasonable and transparent. They are always ready to communicate both over the phone and in person and if the architect that you want to speak to is unavailable, they do call you back the following day. I cannot recommend them enough.