Senior/principal Mechanical engineer

A leading UK Building Services & Sustainability Consultancy is looking to appoint a talented Senior / Principal Mechanical Design Engineer to join their growing Leeds team. This firm is recognised for delivering forward‑thinking M&E design, low‑carbon solutions and high‑quality engineering consultancy across all sectors of the built environment, operating from multiple UK offices including Leeds.This is an excellent opportunity for an experienced mechanical engineer who is passionate about technical excellence, low‑carbon design, innovation, and collaborative project delivery. Role Responsibilities Lead and develop mechanical building services designs across a wide range of sectors (commercial, healthcare, education, industrial, residential and mixed‑use). Deliver feasibility studies, mechanical calculations, reports, specifications and detailed design packages. Coordinate with multidisciplinary teams including electrical, sustainability, BIM and cost consultancy. Mentor junior engineers and support the ongoing technical development of the mechanical team. Engage directly with clients, architects and project stakeholders to support successful project delivery. Ensure mechanical designs meet all current legislation, industry standards and best‑practice guidelines. Contribute to low‑carbon, energy‑efficient and sustainable design strategies, aligned with modern building performance expectations. Support projects from early concept through to building completion and handover.About You Strong experience in mechanical building services design within a consultancy environment. Able to lead projects independently or take ownership of major design work packages. Skilled in mechanical design software including IES, Revit, AutoCAD and specification tools. Strong understanding of UK Building Regulations, CIBSE guidance, sustainability and low‑carbon engineering principles. Excellent communication skills with confidence in facing clients and coordinating with design teams. Degree‑qualified in Mechanical Engineering or Building Services Engineering; working toward or holding IEng / CEng is advantageous.What's on Offer Opportunity to join a well‑established, award‑winning building services consultancy with over 20 years' expertise. Career progression pathways within a growing Leeds office delivering major projects. Exposure to a wide range of sectors and technically challenging schemes. Collaborative culture with a focus on sustainability, innovation and engineering excellence. Competitive salary, benefits and professional development support. What you need to do now - Reach me directly at If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now. If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career. Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at (url removed)