Senior / Principal Mechanical Design Engineer

Senior to Principal Mechanical Design Engineer

Location: Oxford | Sectors: Low Carbon, Heritage, Education, Healthcare

About the Company

Join a well-established, independent building services consultancy in Oxford, known for delivering sustainable, technically robust solutions across heritage refurbishments, modern low-energy campuses, and complex infrastructure projects. Our integrated team combines mechanical, electrical, lighting, Passivhaus, and building physics expertise under one roof.
With a strong pipeline of work and investment in people, this role offers long-term progression and a chance to shape meaningful projects.

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The Role

As a Senior or Principal Mechanical Engineer, you will:

• Lead mechanical design from RIBA Stage 2 to handover: HVAC, hot/cold water, and sustainable strategies.
• Collaborate with clients, architects, and internal teams to create energy-efficient, technically sound solutions.
• Apply building physics and performance analysis where relevant.
• Oversee technical documentation, drawings (AutoCAD/Revit), and specifications.
• Attend site visits, manage design coordination, and support construction.
• Mentor junior engineers and contribute to knowledge sharing.
• At Principal level: influence fee proposals, resourcing, and client development.

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What We’re Looking For

• Degree-qualified in Mechanical Engineering or Building Services.
• 6+ years of consultancy experience delivering mechanical design.
• Experience across education, commercial, healthcare, or heritage projects.
• Strong understanding of HVAC systems, regulations, and energy-efficient design.
• Proficiency in Revit, AutoCAD, IES, Hevacomp, or similar.
• Excellent communication and coordination skills.
• Chartered (CEng/MCIBSE) or working toward chartership preferred.

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What We Offer

• Competitive salary: £55,000–£70,000 (DOE)
• Flexible/hybrid working, 25+ days holiday, private healthcare, cycle-to-work scheme
• Varied project portfolio: listed buildings, modern low-energy campuses, sustainability-led projects
• Support for professional growth: chartership, leadership development, career progression to Associate and beyond
• Collaborative team culture with low staff turnover

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If you’re a Senior or Principal Mechanical Engineer looking to work on sustainable, heritage-focused projects with career progression, this is your chance to make a tangible impact.