Senior Sustainability/Building Physics Engineer Location: Cardiff - With travel to Bristol - Hybrid Salary: £40,000 - £55,000 DOE A dynamic and forward-thinking consulting and engineering firm is seeking an experienced and eager Senior Sustainability/Building Physics Engineer to join their team in Bristol. As part of the team, you will be working on a range of high-profile projects across various sectors, offering integral advice and solutions. Key responsibilities: Lead and develop the building physics and sustainability consultancy input throughout project lifecycles—from concept to completion Contribute to or lead sustainability strategies, including BREEAM, Passivhaus, and Net Zero Carbon frameworks. Conduct dynamic thermal modelling, energy performance simulations, and embodied carbon and life-cycle assessments using tools such as IES VE, SBEM, or similar Undertake overheating assessments, thermal comfort analysis, daylighting, and natural ventilation design evaluations Attend and contribute at design team meetings, client presentations, and site reviews to provide specialist building physics guidance Ensure design proposals comply with UK legislation and best practice—e.g. Part L, NPPF, London Plan, CIBSE guidelines, TM52, TM59, BB101 Prepare comprehensive technical reports, sustainability statements, and certification materials for schemes like BREEAM, Passivhaus, and EPC submissionsWhat we’re looking for: Proficient in IES, AutoCAD and Revit A degree in Building Services, Architectural and Environmental Engineering, Energy, Sustainability, or a related discipline A qualified Low Carbon Energy Assessor (candidates currently working towards certification will also be considered) Knowledge of sustainability frameworks and standards, including BREEAM, Net Zero Carbon, and Passivhaus principles Strong understanding of Building Services, including building physics, thermal dynamics, and related calculations; familiarity with current and emerging legislation such as the NPPF, Part L, and the London Plan Experience with energy modelling, life cycle assessments (LCA), and embodied carbon analysisBenefits: 25 days annual leave plus bank holidays 37 hour working week with hybrid arrangements available Private healthcare and life insurance Annual performance bonus Recruitment referral bonus scheme Interested? If you are a Senior Sustainability/Building Physics Engineer looking to take your next steps, we’d love to hear from you! Apply today or reach out to Katie Davison at Aztrum for a private and confidential conversation