Senior / Principal Mechanical Design Engineer

Pertemps; Eastleigh; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

An established MEP consultancy is seeking a Senior to Principal Mechanical Design Engineer to lead mechanical design on complex projects. This role involves mentorship, client interaction, and ensuring compliance with UK building regulations. You will benefit from flexible working arrangements and a robust benefits package, aimed at promoting work-life balance and career progression.

Benefits

28 days’ annual leave + bank holidays

Annual performance bonus

Private medical cover & life insurance

Enhanced pension scheme

Cycle to work scheme

Annual training allowance

Qualifications

• 7+ years of experience in mechanical building services design.
• Up-to-date understanding of UK building regulations and CIBSE standards.
• Chartered or working towards CEng status.

Responsibilities

• Lead mechanical design on complex projects.
• Take ownership of project outputs including reports and specifications.
• Provide mentorship and technical oversight to junior engineers.

Skills

Mechanical design

HVAC systems

Client communication

Project management

Mentorship

Education

Degree in Mechanical or Building Services Engineering

Tools

Hevacomp

IES

Revit

AutoCAD

Job description

Overview

Senior to Principal Mechanical Design Engineer – Building Services

Southampton (Hybrid Working)
Full-Time
Highly Competitive Salary + Bonus + Benefits

What You’ll Be Doing

• Lead mechanical design on a range of complex projects, from early-stage feasibility to technical delivery and handover
• Take ownership of project outputs including reports, calculations, technical specifications, and coordinated drawings
• Collaborate closely with multidisciplinary teams including electrical, sustainability, and BIM engineers
• Represent the consultancy in client, design team, and contractor meetings
• Provide mentorship and technical oversight to junior and intermediate engineers
• Deliver solutions that incorporate sustainable and renewable technologies, complying with relevant legislation and environmental targets
• Oversee resource planning, programme delivery, commercial aspects, and QA compliance on your projects
• Contribute to technical standards, internal knowledge sharing, and continuous improvement across the team

What You’ll Bring

• Degree qualified in Mechanical or Building Services Engineering (BEng, MEng, or equivalent)
• Typically 7+ years of experience in mechanical building services design
• In-depth knowledge of HVAC, public health systems, plant room layout, and system integration
• Experience using mechanical design tools (Hevacomp, IES, Revit, AutoCAD, etc.)
• Up-to-date understanding of UK building regulations, CIBSE standards, and sustainability drivers
• Chartered or working towards CEng status with CIBSE or IMechE
• A track record of leading design teams and delivering high-quality projects
• Confident communicator with a client-focused mindset and excellent coordination skills
• Comfortable balancing design detail with project management responsibilities

Why You’ll Want to Join

• Work with one of the region’s most established independent MEP consultancies
• Flexible and hybrid working arrangements that promote a healthy work-life balance
• Diverse project exposure across hospitals, education campuses, science labs, and heritage refurbishments
• Clear progression routes toward Associate/Director level roles
• Attractive benefits package, including:
  • 28 days’ annual leave + bank holidays
  • Annual performance bonus
  • Private medical cover & life insurance
  • Enhanced pension scheme
  • Cycle to work scheme
  • Annual training allowance and full support to achieve chartership
• Supportive, people-first culture focused on long-term success and technical excellence

Looking to lead high-impact projects and mentor the next generation of engineers?
This is an ideal opportunity for a Senior or Principal Mechanical Engineer ready to make a meaningful step in their career.

Apply now for a confidential chat.