Expertise
Architecture & Design
We are a London-based architectural practice working across sectors including residential, healthcare, education and masterplanning. Our approach integrates design, structure, materials and context to create buildings that perform well and enhance everyday life. We respond to evolving demands around energy, regulation and environmental impact, shaping both new buildings and retrofits that balance performance with character. Sustainability is central to our work, ensuring longevity, efficiency and design quality. From concept to completion, we deliver thoughtful, well-resolved projects that are practical, adaptable and designed to support modern life while retaining a strong sense of identity.
More about Architecture & DesignSustainability
Sustainability is central to how we design and deliver buildings. We work within an evolving regulatory landscape shaped by the UK’s Net Zero 2050 target, helping clients reduce carbon in both new and existing projects. Our approach considers operational and embodied carbon from the outset, integrating fabric performance, low-carbon systems and passive design into a cohesive whole. We guide clients through technical requirements with clarity, focusing on solutions that are efficient, durable and adaptable. Supported by Cagni Williams Energy, we deliver buildings and retrofit strategies that reduce environmental impact while maintaining design quality, long-term performance and practical value. Cagni Williams Energy advises on decarbonization strategies and can design and deliver retrofit and low energy projects for new and existing buildings.
More about SustainabilityFeasibility
We work with clients to define clear, strategic briefs that unlock value and set a strong foundation for successful projects. Through early-stage analysis, site appraisal and feasibility studies, we assess opportunities, constraints and development potential to inform confident decision-making. Our approach balances design ambition with commercial, planning and operational realities, ensuring projects are viable, efficient and aligned with long-term goals. As projects progress, we maintain a clear link between strategy and delivery, guiding designs that are practical, adaptable and buildable. The result is high-quality architecture that performs well, supports users and delivers lasting value.
More about FeasibilityMaterials
We take a considered approach to material selection, aligning each choice with how a building should perform, feel and endure. By prioritising clarity, durability and consistency, we create spaces that are both refined and robust. Material performance is assessed alongside aesthetic intent, including factors such as embodied carbon, lifespan and maintenance. Careful detailing ensures these decisions are carried through into construction, supported by clear technical information and close collaboration on site. The result is architecture that is coherent, reliable and long-lasting, balancing quality, buildability and environmental responsibility while delivering spaces that are practical, elegant and designed to stand the test of time.
More about MaterialsPlanning Support
We provide clear and strategic planning support to help secure consent with confidence. Our approach focuses on building strong planning narratives that demonstrate design quality and wider benefit, while addressing key considerations early. We manage engagement with local authorities, stakeholders and communities, coordinating specialist inputs to ensure proposals are well supported and clearly communicated. With experience in heritage and conservation, we navigate complex requirements with sensitivity, developing solutions that respect context while enabling change. By aligning strategy, consultation and technical input, we reduce risk, maintain momentum and improve the likelihood of successful outcomes.
More about Planning SupportProject Management
We provide strong project leadership and coordination from concept through to completion, acting as architect, Principal Designer and design team lead. Our role is to align consultants, manage information and keep clients informed at every stage. Through clear processes, structured programmes and regular reviews, we support informed decision-making while maintaining control of cost and programme. As projects move into delivery, we lead technical coordination, contract administration and compliance. By resolving challenges early and ensuring designs are fully developed before construction, we reduce risk, protect quality and deliver buildings that perform well, remain on programme and provide lasting value.
More about Project ManagementDigital Modelling
We use advanced digital modelling and visualisation to develop, test and communicate designs with clarity. Fully coordinated 3D models allow clients and project teams to understand space, light and materiality from the earliest stages. Working in BIM using Autodesk Revit, we integrate design information to coordinate consultants, identify clashes and reduce risk before construction begins. This approach improves efficiency, accuracy and delivery on site, while supporting facilities management after completion. We also produce high-quality visualisations, including rendered images, physical models and walkthroughs, helping clients, stakeholders and communities engage with and confidently understand the design as it evolves.
More about Digital ModellingAdaptive Reuse
Cagni Williams’ expertise in retrofit and adaptive reuse is rooted in a belief that the future of the built environment lies in working intelligently with what already exists. By combining design excellence with technical innovation, the practice transforms existing buildings into sustainable, high-performing spaces that support modern life. Retaining character while improving efficiency, each project reduces environmental impact and extends the life of valuable assets. Through a collaborative and research-led approach, Cagni Williams delivers thoughtful, resilient architecture that connects past and present, demonstrating how existing buildings can be reimagined for a low-carbon future. Cagni Williams Energy provides decarbonisation strategies for private residential and commercial landlords.
More about Adaptive Reuse