NSB Recruitment are currently working with an established and forward-thinking multidisciplinary consultancy is seeking a Senior or Principal Sustainability Consultant to join its growing Sustainability & Energy team in London. This is an exciting opportunity to play a key role within a progressive practice delivering innovative low-carbon and sustainability-led solutions across the built environment. You’ll work alongside engineers, designers and environmental specialists in a highly collaborative setting, contributing to projects that genuinely shape more responsible, resilient places. The organisation promotes a culture built around trust, flexibility and technical excellence, offering the chance to grow your influence while helping to develop others. The Role This is a varied and influential position, suited to an experienced sustainability professional ready to take on greater responsibility within a dynamic consultancy environment. You will be involved in the delivery and leadership of sustainability services across a diverse portfolio of projects, from early concept through to completion. Key responsibilities will include: Managing and delivering small to medium-scale sustainability commissions Supporting and leading workstreams on larger, complex projects Facilitating sustainability and energy workshops with clients and design teams Reviewing, coordinating and delegating work across project teams Mentoring and supporting the development of junior consultants Undertaking technical modelling and analysis, including: Whole life and embodied carbon Circular economy strategies Building performance simulation Operational energy and renewables Thermal comfort and overheating assessments Developing project sustainability, carbon and energy strategies Delivering environmental certifications such as BREEAM, WELL and HQM Supporting the delivery of net zero whole life carbon outcomes Contributing to internal research, innovation and thought leadership Producing technical reports, specifications and planning documentation Managing client relationships and collaborating with multidisciplinary teams Overseeing commercial aspects of your projects, including programme, resourcing and invoicing About You You’ll be a motivated sustainability consultant with strong technical foundations and a passion for driving meaningful change in the built environment. While no candidate is expected to cover every area, you should bring depth in several of the following: Energy and carbon strategies Part L compliance (Elmhurst, IES or similar) NABERS UK modelling In-use energy assessments Dynamic thermal modelling and overheating analysis BREEAM, HQM and related certifications Net zero and embodied carbon calculations Circular economy approaches Planning-stage sustainability and energy statements Health and wellbeing strategies Requirements To be successful, you are likely to have: A relevant degree (engineering, environmental science, sustainability or similar) Proven experience within a sustainability or environmental consultancy environment Confidence leading technical discussions and workshops with clients and design teams Strong communication and report-writing skills A collaborative, proactive and solutions-driven approach A genuine commitment to sustainability and low-carbon design The ambition to progress within a respected and growing consultancy Why Apply? This role offers the chance to join a consultancy at the forefront of sustainability and energy in the built environment, with clear routes for career progression, exposure to high-profile projects and a supportive, flexible working culture. If you're looking to elevate your career while making a tangible impact on climate and resource challenges, this is a compelling next step.