Based in Surrey, James Williamson Architects Ltd operates as a RIBA Chartered architectural practice specialising in high-quality residential architecture. We work closely with homeowners who require clear professional guidance, sound regulatory knowledge, and thoughtfully resolved design outcomes. Our service is defined by structure, clarity, and a calm approach to residential projects.
We primarily deliver residential extensions, renovations, retrofits, and bespoke new-build homes across Surrey and the wider South East. Our project experience includes kitchen and living space improvements, loft conversions, whole-house refurbishments, energy-efficient upgrades, heritage properties, and new dwellings. Clients are guided step by step from feasibility studies and planning advice through concept design, technical detailing, and construction support. We place particular emphasis on buildability, risk management, and compliance with planning and building regulations, including acting as Principal Designer under the CDM Regulations. Sustainability and long-term performance are central to our work, with a focus on fabric-first design and sensitive retrofit strategies. Through close collaboration with consultants, contractors, and local authorities, we maintain consistent quality and clarity throughout each project.
- Surrey, Sussex, Berkshire, Hampshire, London
- Year established: 2020
- Employees: 4
- Licensed
- Insured
- 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.
- RIBA Chartered Practice
- Debit cards, Credit cards, Mobile payments, Bank transfers
Our renovation and extension service is built around clarity, structure and informed decision-making. We help clients understand what is possible within their home before any commitment is made. With a clear process and careful attention to detail, we create well-considered spaces that feel brighter, more practical and aligned with how our clients live. 
We guide clients through the new build process with a clear framework and predictable stages. From concept design to on-site support, our role is to protect quality, budget, and intent. Designs are tailored to lifestyle, sustainability, and future needs. This results in homes that are both practical and enduring. 
Our practice delivers sensitive heritage and conservation solutions for homeowners seeking reassurance and expertise. We interpret planning policy, liaise with relevant authorities, and develop designs that respect historic character. Through clear communication and careful detailing, we help clients achieve a home that feels both authentic and practical. 
Our service supports homeowners who want to improve their homes without costly mistakes or confusion. We lead the process step by step, providing clarity at every decision point. The result is a coherent interior design that balances beauty with practicality, enhances everyday living, and remains resilient and relevant over time. 
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!