Job Title : Principal Mechanical Engineer - Building Services Location : Norwich, UK Salary : Up to £75,000 per annum Contract Type: Permanent, Full-TimeWorking Pattern : Hybrid (with potential for one day per week in the office) Sector : MOD, MOJ, Residential, Commercial, Educational Role Overview We are seeking an experienced and forward-thinking Principal Mechanical Engineer to join our building services team in Norwich. This senior role offers the opportunity to lead mechanical design across a diverse portfolio of projects, including MOD, MOJ, residential, commercial, and educational sectors.You'll play a key role in shaping technical delivery, mentoring junior engineers, and driving sustainable, low-carbon design solutions. With flexible working and the option to be in the office just one day a week, this position offers both autonomy and impact. Key Responsibilities Lead mechanical design and specification of HVAC, public health, and energy systems Deliver projects from concept through to completion, ensuring compliance with UK regulations and client requirements Coordinate with multidisciplinary teams including electrical, architectural, and structural consultants Provide technical leadership and mentorship to junior engineers and technicians Attend client meetings, design reviews, and site inspections Contribute to fee proposals, resource planning, and project programming Ensure designs are delivered on time, within budget, and to a high technical standard Support the development of low-carbon and energy-efficient mechanical strategies Maintain strong relationships with clients, contractors, and stakeholders Candidate Profile Degree in Mechanical Engineering or Building Services Engineering (or equivalent) Chartered Engineer status (or working toward) with a relevant institution (e.g., CIBSE, IMechE) Minimum 8 years' experience in mechanical building services design Proven experience delivering projects in MOD, MOJ, residential, commercial, and educational sectors Strong knowledge of UK building regulations, BS standards, and design codes Proficient in design software such as AutoCAD, Revit, Hevacomp, IES, and Microsoft Office Excellent communication, leadership, and client-facing skills Eligible for UK security clearance (MOD/MOJ requirement) Benefits Competitive salary up to £75,000 per annum Flexible working with potential for one day per week in the office Pension scheme and annual leave package Professional development and chartership support Collaborative team culture and meaningful project work What you need to do now 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 EA is a trading division of Hays Specialist Recruitment Limited and 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 hays.co.uk