Principal/Associate Mechanical Design Engineer

Bennett & Game Recruitment Ltd.; Greater London; Hybrid; GBP 60,000 - 95,000; Full time

Benefits offered by this job

Hybrid working

Healthcare cover (including dental/eyE

Group life insurance from day one

Pension scheme

CPD and chartership support

Professional subscriptions covered

Holiday 24 days + bank holiday

Job summary

Bennett & Game Recruitment Ltd. is representing a London-based building services consultancy seeking a Principal/Associate Mechanical Design Engineer to lead mechanical design across a range of high-profile residential and commercial projects.

You will drive from concept to completion, mentor engineers, and maintain strong client relationships. Utilising zero-carbon design principles, you will work with Revit, BIM coordination, and environmental modelling tools within a hybrid working framework

Qualifications

• A degree in Mechanical Engineering, Building Services Engineering or related discipline.
• Chartered member of CIBSE, IMechE or IET.

Responsibilities

• Lead mechanical engineering design across multiple projects from concept to completion.
• Undertake load calculations, equipment sizing and environmental/thermal modelling.
• Produce design packages, stage reports and BIM coordination specifications.
• Manage project fees, resources and profitability.
• Serve as primary client contact and liaise with external design teams.
• Visit sites to verify design intent and construction standards.
• Provide technical leadership and mentor junior engineers.
• Act as Line Manager and Team Coordinator for workload and development.
• Support business development and maintain client/architect relationships.

Skills

Project leadership

Load calculations

Environmental/thermal modelling

Client liaison

Mentoring junior engineers

Team coordination

Resource management

Commercial awareness

Education

Mechanical/Building Services degree

Chartered membership: CIBSE/IMechE/IET

Tools

AutoCAD 2D

Revit BIM

IES thermal modelling

Job description

Job Profile for Principal/Associate Mechanical Design Engineer 48092

A collaborative building services and environmental design consultancy is looking to appoint a Principal or Associate Mechanical Design Engineer to join its London-based team. This is an excellent opportunity for an ambitious engineer to develop their career within a supportive design environment, working alongside experienced professionals on a varied range of innovative and project-led instructions.The business has an established reputation in zero-carbon building services engineering, environmental design, and digital 3D design/BIM (Revit) expertise, aiming to help create a world where every building is truly zero carbon. With a strong pipeline of work and a collaborative team, this role offers the opportunity to lead exciting projects, develop technical expertise, and contribute to pioneering sustainable construction solutions.

Benefits:

• £60,000 - £95,000, depending on experience (covering Principal through Associate levels)
• 24 days holiday + bank holiday
• Comprehensive healthcare cover including dental and eyecare (upon successful completion of probation)
• Mental health support and bereavement counselling
• Group life insurance cover provided from day one
• Contributory company pension scheme
• Professional membership subscriptions covered (e.g., CIBSE, IMechE, IET)
• Regular continued professional development and support to attain or maintain chartership
• Hybrid and flexible working model

Job Overview

The successful candidate will join an established team of building services and environmental engineering professionals, working across a range of high-profile residential, commercial, and specialist project-based instructions. Depending on seniority, the role will involve acting as Project Lead across multiple projects and, at the Associate level, acting as Team Coordinator and line manager to guide team members, manage resources, and oversee project delivery. Working closely with directors and senior colleagues, you will lead engineering design at all project stages. The business is keen to empower engineers, providing real project ownership, strong client-facing exposure, and clear pathways for career progression within the leadership structure. The role will include:

• Leading the mechanical engineering design across multiple projects from concept to completion.
• Undertaking detailed load calculations, equipment sizing, and environmental/thermal modelling considerations.
• Producing design packages, stage reports, 2D/3D BIM coordination specifications, and technical schedules.
• Managing project fees, resources, and project profitability.
• Acting as the primary client-facing contact and liaising with external design team members, architects, and contractors.
• Visiting sites to conduct inspections, ensuring design intent and construction standards are met.
• Providing technical engineering leadership internally, delegating tasks, and mentoring junior engineers.
• Acting as Line Manager and Team Coordinator, supporting individual welfare, workload allocation, and career development.
• Contributing to business development, maintaining architect/client relationships, and staying ahead of sustainability trends.

Job Requirements

• A degree in Mechanical Engineering, Building Services Engineering, or a related discipline
• Chartered member of either CIBSE, IMechE, or IET
• Proven experience leading project design, managing project finances, and acting as the primary point of contact for external teams
• Strong technical background in mechanical design, building services, and all‑electric, low‑carbon energy strategies
• Proficiency with 2D AutoCAD and experience using 3D modelling/BIM software such as Revit, alongside familiarity with thermal modelling software such as IES
• Strong knowledge of relevant Building Regulations, CIBSE guidelines, planning policies, British Standards, and CDM responsibilities
• Experience delegating work, supporting junior engineers, and leading internal teams
• Excellent communication, interpersonal, report‑writing, and client presentation skills
• A proactive, collaborative approach and a commitment to sustainable, zero‑carbon design

This is an opportunity to join a growing, award‑winning consultancy where professional growth is actively supported, with exposure to innovative projects and a clear path for senior leadership