Senior / Principal Mechanical Design Engineer

Pertemps; Oxford; Hybrid; GBP 55,000 - 70,000; Full time

Job summary

A well-established building services consultancy in Oxford seeks a Senior to Principal Mechanical Design Engineer to strengthen their mechanical team. Known for sustainable solutions in heritage, education, and infrastructure, they offer a variety of projects and a clear progression path. This role involves leading mechanical design, collaboration, technical documentation, and mentoring with a competitive salary and numerous benefits.

Benefits

Flexible/hybrid working

25+ days holiday

Private healthcare

Cycle to work scheme

CPD support

Support towards chartership

Leadership development

Qualifications

• 6+ years of experience in a consultancy environment delivering mechanical design.
• Chartership (CEng MCIBSE) or working towards it is desirable.

Responsibilities

• Lead mechanical design from RIBA Stage 2 through to handover, including detailed HVAC and sustainable design.
• Mentor junior engineers and contribute to technical documentation.

Skills

Technical understanding of HVAC systems

Communication skills

Coordination skills

Education

Degree in Mechanical Engineering or Building Services

Tools

Revit

AutoCAD

IES

Hevacomp

Job description

Senior to Principal Mechanical Design Engineer | Oxford | Low Carbon Projects, Heritage Refurbishments, Progression Opportunity

A well-established, independent building services consultancy in Oxford is looking to strengthen their mechanical team with an experienced Senior or Principal Mechanical Engineer.
Known for delivering technically robust, sustainable solutions across heritage, education, healthcare, and infrastructure projects, this team combines mechanical, electrical, lighting, Passivhaus, and building physics expertise under one roof. With a strong pipeline of work and ongoing investment in their people, this is a great opportunity to step into a high-impact role with long-term progression potential.

️ Role Overview:

• Lead or support mechanical design from RIBA Stage 2 through to handover, including detailed HVAC, hot and cold-water systems, and sustainable design strategies
• Collaborate with clients, architects, and internal teams to develop low-energy, technically sound solutions across new-builds and complex refurbishments
• Apply building performance analysis and building physics principles where relevant, working closely with in-house specialists
• Oversee or contribute to technical documentation, drawings (AutoCAD, Revit), and specifications
• Attend site visits, manage design coordination, and provide support throughout the construction phase
• Mentor junior engineers and take an active role in internal knowledge sharing
• At Principal level, contribute to fee proposals, resourcing, and client development

What You’ll Bring:

• Degree-qualified in Mechanical Engineering or Building Services (or similar)
• 6+ years of experience in a consultancy environment delivering mechanical design
• Experience working on projects in sectors like education, commercial, healthcare, or heritage
• Excellent technical understanding of HVAC systems, regulations, and energy-efficient design
• Familiarity with Revit, AutoCAD, IES or Hevacomp (or similar design tools)
• Strong communication and coordination skills
• Chartership (CEng MCIBSE) or working towards it is desirable

What’s on Offer:

• Competitive salary based on experience, typically between £55,000 and £70,000 for this level
• A broad project portfolio with real design variety, including listed buildings and modern low-energy campuses
• Flexible/hybrid working, 25+ days holiday, private healthcare, cycle to work scheme, CPD support, and more
• A collaborative, technically strong team with a great culture and low staff turnover
• Structured progression path to Associate and beyond, with support toward chartership and leadership development

If you’re a Senior or Principal Mechanical Engineer looking for meaningful, sustainability-focused work with room to grow, this is an opportunity well worth exploring.