We are an award-winning architectural studio driven by creativity and a commitment to delivering bespoke solutions tailored to each client. Founded in 2010, we operate as a RIBA Chartered Architecture practice and have delivered projects across London and the South East of England. Our experience is rooted in the high-end residential sector, encompassing individual homes, new-build apartments, refurbishments, basement developments, extensions and loft conversions. We take pride in our collaborative approach and in guiding our clients carefully from initial concept through to the successful completion of their project.
Our services cover every stage of the architectural process. We begin with concept briefing and measured surveys, developing layout options and accurate drawings that reveal the full potential of a property. We then prepare scheme designs and manage the planning application process, working closely with local authorities. To assist visual understanding, we offer 3D modelling and visualisation services. Our technical expertise includes detailed construction drawings, coordination with building control, and consultant appointments. We also provide interior architecture, specification and FF&E services, tender management, contractor selection and on-site contract administration, ensuring quality, clarity and continuity throughout construction.
Our services cover every stage of the architectural process. We begin with concept briefing and measured surveys, developing layout options and accurate drawings that reveal the full potential of a property. We then prepare scheme designs and manage the planning application process, working closely with local authorities. To assist visual understanding, we offer 3D modelling and visualisation services. Our technical expertise includes detailed construction drawings, coordination with building control, and consultant appointments. We also provide interior architecture, specification and FF&E services, tender management, contractor selection and on-site contract administration, ensuring quality, clarity and continuity throughout construction.
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
Our practice specialises exclusively in residential architecture, supported by more than 15 years of industry experience. We operate as a RIBA Chartered studio, adhering to recognised standards of ethics and quality. Each project is informed by planning knowledge and technical expertise. We prioritise clarity, compliance, and well-executed design at every stage. 
At Armstrong Simmonds Architects, we deliver bespoke rear extensions that enhance everyday living. Our designs prioritise natural light, spatial flow and a strong relationship with the garden. We carefully tailor each scheme to suit our clients lifestyles while respecting the character of the existing property and meeting all relevant planning and technical requirements. 
We provide a comprehensive architectural service for basement developments, focusing on quality, precision, and tailored design outcomes. By balancing aesthetics with technical rigour, we create functional and sophisticated underground spaces while carefully managing planning processes, regulatory standards, and the specific challenges associated with complex residential buildings. 
We specialise in flat conversions that transform existing properties into highly functional living spaces. Whether reconfiguring a single dwelling into multiple units or combining flats into one home, our approach maximises spatial potential. With careful planning and design expertise, we deliver solutions that respond to demand, enhance value, and respect regulatory requirements. 
A well-executed house renovation can significantly enhance everyday living. We design bespoke solutions that modernise homes, improve functionality, and honour original details when required. Operating within London demands careful navigation of planning policy and regulations. Our practice offers a considered, end-to-end approach, ensuring each renovation is delivered with clarity, rigour, and lasting value. 
We specialise in bespoke loft conversions designed to maximise underused space and improve everyday living. Our team guides clients through surveying, design development, and regulatory coordination, maintaining close involvement throughout construction. By addressing structure, light, and layout from the outset, we ensure the finished space feels coherent and purposeful.
Reviews (9)
Christian M.
Jun 24, 2026
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Daniel Gabbay
Apr 12, 2026
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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
Dom & Kamilla
Dec 15, 2025
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We worked with Alan and the team from Armstrong Simmonds for 3 years from start to finish to achieve the full renovation of a London townhouse. It was a challenging brief given the nature of the property but collectively what has been achieved is an outstanding end result. Alan and John thoughtfully incorporated our vision with the realities of converting an old Victorian house and the scrupulous attention to detail, symmetry and balance achieved in the design were instrumental in us choosing Armstrong Simmonds in the first place. In addition Alan supported us through the tender and during the renovation working with our excellent builder Cezar of Vecchini to deliver the brief. I would highly recommend if you are looking for a team to turning your vision to the end product with a very high attention to detail while still being good humoured and a generally great guy to work with. Thanks again team. Dom and Kamilla
Tessa Irwin
Oct 17, 2025
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Nathan
Aug 20, 2023
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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.
Martin Drummond
Aug 28, 2021
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John and Nick did a fantastic job firstly in drafting the plans for our basement conversion and side return, then also in helping us obtain planning permission within the restraints of a conservation area. Nick was very pleasant to deal with, very proactive and responsive, and went the extra mile to get the critical aspects of the design through planning.
Giles Ritchie
Aug 13, 2019
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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.