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.

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 proposals, resourcing, and client development.

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 .

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

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