Business Details
6 Years
experience
We focus on residential extensions, renovations, retrofits, and bespoke new-build homes, serving clients across Surrey and the wider South East. Our projects range from internal reconfigurations and loft conversions to full-house refurbishments, energy-efficient upgrades, heritage buildings, and custom-designed homes. We adopt a structured approach that guides clients through feasibility assessments, planning applications, design development, technical coordination, and construction support. Particular attention is given to buildability, risk management, and compliance with UK planning and building regulations, including our responsibilities as Principal Designer under the CDM framework. Sustainability is integral to our design process, incorporating fabric-first principles, low-carbon strategies, and sensitive retrofit solutions. With detailed local planning knowledge and a measured, client-focused approach, we help homeowners achieve comfortable, durable homes while ensuring the process remains clear and professionally managed.
Served areas
- Surrey, Sussex, Berkshire, Hampshire, London
Details
- Year established: 2020
- Employees: 4
Highlights and features
- RIBA Chartered architect delivering clarity, confidence, and calm.
- Bespoke renovations, extensions, and new-build homes designed.
- Planning advice and feasibility studies to unlock potential.
- Passive House and EnerPHit retrofits for efficient living.
- Collaborative 3D and virtual reality design visualisation.
- End-to-end support, from permissions through to completion.
Associations and certifications
- RIBA Chartered Practice
Payment methods
- Credit cards, Debit cards, Mobile payments, Bank transfers
Services
Home Renovations & Extensions
We help clients unlock the full potential of their homes without the upheaval of moving. By offering a clear, step-by-step process, we replace uncertainty with informed choices. Each project is designed to improve flow, comfort and practicality, resulting in homes that feel calmer, brighter and better suited to family living.
New Build
Our new build service is centred on creating homes that feel considered, efficient, and built to endure. We guide families through each step with clarity, helping them make informed decisions without unnecessary stress. Design choices are shaped by lifestyle, light, and energy efficiency. The result is a home that is both beautiful and adaptable over time.
Heritage & Conservation
We help owners of historic and listed homes navigate conservation requirements with clarity and care. By combining architectural expertise with a deep respect for original fabric, we ensure every intervention is appropriate and well judged. Our process removes uncertainty, allowing clients to enhance their homes without compromising their heritage value.
Interior Architecture
Our interior architecture service is designed to help homeowners redesign with confidence rather than overwhelm. We translate early ideas into clear, practical solutions, supporting you from first concepts to completed interiors. Every project combines thoughtful planning, refined aesthetics, and durable materials to deliver spaces that feel effortless, personal, and enduring.
Reviews (7)
John Armenakas
Sep 19, 2025
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James was wonderful to work with, and provided us with 2 wonderful designs that captured everything we wanted in our extension. Once we decided the design we wanted to move forward with, James worked through the planning approval process for us. The results are amazing, and we are so happy with the way our extension looks.
Tom Wood
Dec 30, 2024
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We have worked closely with James on a few different projects now and it has been a great experience from design to completion.
Clear, concise design and drawings made the construction process extremely smooth. We would highly recommend James Williamson Architects.
Clear, concise design and drawings made the construction process extremely smooth. We would highly recommend James Williamson Architects.
Heather Steen
Nov 28, 2024
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Our experience with James was fantastic throughout! After an initial survey of the space, and design proposal, we had in-depth discussions with James together with our builder. He listened to our thoughts and preferences, took time to answer questions really clearly and show us options, before we agreed on a final plan. We were really pleased to have James back to visit to see the end result. I would thoroughly recommend!
Sam Price
Dec 17, 2023
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I can not recommend James enough. He was was a recommendation from our builder and worked for us after we had a poor experience with another architect. James was quick, thorough and a delight to deal with. Would most definitely use James again and have recommended him to friends already.
James Pace
Nov 27, 2023
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Fantastic service throughout the whole design process and would highly recommend to anyone looking to renovate or extend their property.
Sally Hewison
Sep 15, 2023
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We engaged James to explore the possibility of updating our small bungalow and incorporating an additional bedroom and bathroom. Communication was very smooth and James listened attentively, understood the brief well and produced an imaginative design which used the limited space available to its best advantage. The design included floor plans and a 3D virtual walkthrough. We decided for personal reasons not to go further at the present time, but if our situation changes in the future we will be more than happy to continue working with JWA
Joseph Kane
Jun 23, 2023
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James designed a wrap around extension to our Victorian terraced house and we couldnt be happier with the job he did. Very straightforward to deal with, fantastic design proposals and great imagery to help us visualise the different options. The technical drawings he prepared were very accurate which helped make the build process as straightforward as it could be. Would definitely recommend.