Junior M&E Designer

Department: M&E - Pre-construction

Employment Type: Full Time

Location: London

Harmony is on a mission to be the best life safety partner to work with and for. Rated an ‘Outstanding Employer’ by Best Companies in 2025, we are only getting bigger and stronger — and we’re looking for A-players to help us get there.

We are passionate about making a difference and obsessed with quality. Our goal is to build a world where every resident can sleep safely at night, knowing their home is 100% safe.

We are looking for a Junior M&E Designer to join our M&E Pre-Construction team in London. You will support the design and specification of mechanical and electrical fire safety systems — including fire alarms, emergency lighting, sprinklers, and associated M&E works — producing drawings, design packages, and technical documentation that underpin our tender submissions and pre‑construction programmes across a nationwide portfolio.

This is a great opportunity for an early‑career M&E designer to develop their skills in a fast paced, technically demanding environment, supported by experienced engineers and working on projects that directly contribute to the safety of buildings and residents across the UK.

• Produce M&E design drawings and schematics for fire alarm, emergency lighting, sprinkler, and associated mechanical and electrical fire safety systems, using CAD and BIM tools.
• Support senior designers and engineers in the preparation of design packages, specifications, and technical documentation for tender submissions and pre construction activity.
• Carry out design take-offs and produce equipment schedules, cable schedules, and associated documentation for use in tender submissions and project handovers.
• Assist with the review and interpretation of client specifications, architectural drawings, and structural information to inform M&E designs.
• Support site surveys and pre-construction visits, contributing to the capture of site information and the production of as-existing drawings.
• Ensure all design outputs comply with relevant British Standards (including BS 5839, BS 5266, and BS EN 12845), Approved Documents, and client requirements.
• Maintain accurate and well‑organised drawing registers and design file management across live projects.
• Liaise with the estimating and pre-construction teams to ensure design outputs align with project scope and pricing.
• Assist with the preparation of O&M documentation and design handover packs for won projects.
• Develop your knowledge of M&E fire safety systems, standards, and pre-construction processes, supported by the wider M&E team.

• An A-player mindset — high standards, extreme ownership and the drive to do things properly, the first time.
• Experience or strong academic grounding in M&E design, building services engineering, or a closely related discipline.
• Proficient in AutoCAD; experience with Revit or other BIM tools is a strong advantage.
• Good understanding of mechanical and electrical building services systems, with a developing knowledge of fire safety systems (fire alarms, emergency lighting, sprinklers).
• Familiarity with relevant British Standards and design requirements for M&E fire safety systems (preferable).
• Strong attention to detail — accurate and thorough in drawing production, documentation, and data management.
• Organised and proactive — able to manage multiple tasks across live projects and meet deadlines.
• Good communicator — comfortable working alongside engineers, estimators, and project teams.
• Degree or HNC/HND in building services engineering, mechanical engineering, electrical engineering, or a related discipline (preferable).
• London office-based with willingness to travel to sites…