Junior M&E Designer

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 nationwide as required.