James Williamson Architects Ltd is a RIBA Chartered architectural practice based in Surrey, providing high-quality residential architecture for homeowners who value clear professional guidance, regulatory assurance, and carefully resolved design solutions. We specialise in supporting private clients through complex residential projects, offering a considered and methodical service that prioritises clarity, quality, and informed decision-making. Our work is rooted in a deep understanding of residential architecture and the specific requirements of clients across Surrey and the wider South East.
Our practice concentrates on residential extensions, renovations, retrofits, and bespoke new-build homes. We deliver projects ranging from kitchen and living space reconfigurations and loft conversions to whole-house renovations, low-energy upgrades, heritage properties, and new residential dwellings. Clients are guided through every stage of the process, from early feasibility studies and planning advice to detailed design, statutory approvals, and construction support. We place strong emphasis on buildability, risk management, and technical coordination, including our role as Principal Designer under the CDM Regulations. Sustainability underpins our approach through fabric-first design, energy-efficient layouts, and sensitive retrofit strategies. With extensive local planning knowledge and a calm, client-focused ethos, we help homeowners create practical, comfortable, and enduring homes while keeping the design and construction journey clear and manageable.
- 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
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We support families who love their homes but need them to function differently. By managing the design, planning and coordination process, we reduce stress and provide reassurance throughout the project. Our approach ensures that each renovation or extension delivers practical improvements, visual clarity and long-term value without unnecessary disruption. 
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. 
We specialise in heritage and conservation architecture, guiding homeowners through the careful restoration of historic properties. Our approach balances planning requirements, original features, and contemporary living needs. We protect each buildings character while introducing thoughtful upgrades, providing clear advice and reassurance throughout a process that can otherwise feel complex and uncertain. 
Our interior architecture work begins with understanding how your home needs to function. We then develop designs that integrate flow, light, and materials into a cohesive whole. With clear stages and professional oversight, we deliver interiors that reduce stress, support daily life, and combine elegance with lasting performance. 
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!