Principal Sustainability Consultant - Building Physics

A well-established, leading multidisciplinary building services and sustainability consultancy are looking to appoint a Principal Sustainability Consultant – Building Physics to join their London team. This is a senior technical role within a respected practice delivering integrated MEP, sustainability and environmental design services across commercial, residential, education and mixed-use developments. The practice delivers technically complex projects across high-end residential, commercial office, mixed-use, education and refurbishment schemes, with a strong presence in the London market. Many of their developments involve tight urban sites, ambitious energy targets and detailed fa�ade and services coordination, requiring rigorous building performance input from early concept through to delivery. The Role As Principal Consultant, you will take a lead role in delivering building physics and performance analysis across a varied project portfolio. You will provide strategic input at early design stages, guide project teams on passive and low-carbon solutions, and ensure robust modelling informs design decisions. This is a hands-on technical leadership role, combining detailed simulation work with client engagement and team oversight. Key Responsibilities * Lead dynamic thermal modelling, energy modelling, overheating analysis and carbon assessments. * Deliver Part L compliance modelling and support planning energy strategies. * Advise on passive design, fa�ade performance, fabric optimisation and operational energy reduction. * Present technical outputs clearly to clients, architects and design teams. * Manage project workstreams, ensuring quality and commercial control. * Provide mentorship and technical guidance to junior consultants. * Contribute to the development of internal modelling standards and best practice. About You * Degree qualified in Building Physics, Environmental Design, Engineering or a related discipline. * Experience in building performance or sustainability consultancy. * Strong proficiency in dynamic simulation tools such as IES VE, DesignBuilder or equivalent. * In-depth knowledge of UK Building Regulations (including Part L) and overheating guidance (TM52/TM59). * Experience preparing planning energy statements and sustainability reports. * Confident communicator, comfortable leading technical discussions with clients and stakeholders. * Experience overseeing or mentoring junior team members. The role offers a highly competitive salary package, reflective of principal-level responsibility, alongside a comprehensive benefits package and sits within a growing sustainability function where progression is clearly defined. If you’re interested in finding out more, reach out to Ethan Williams on or click apply to find out more.