Senior Mechanical Building Services Design Engineer

Key Responsibilities

• Technical Leadership & Engineering Design
• Lead delivery of geothermal and mechanical system designs across:
• Feasibility and concept design (RIBA Stages 1–2)
• Scheme design, FEED, and detailed design (RIBA Stages 3–4)
• Delivery, commissioning, and operational support
• Produce and review:
• Feasibility studies, technical reports, and specifications
• Concept designs, layouts, and system options
• Detailed design documentation and calculations
• Develop and review designs for:
• Ground heat exchanger systems and geothermal layouts
• Plantroom layouts (2D and 3D)
• Thermal, hydraulic, and systems models
• Size and select:
• Heat pumps, DACs, boilers, ACCs, CHPs, and ground loops
• Pumps, valves, buffer vessels, DHW cylinders, PHEs, and ancillary equipment
• Develop and review:
• General and particular mechanical specifications
• Control philosophies, control logic, and DESOPS
• Mechanical equipment schedules and electrical load schedules
• Size ground heat exchangers using industry-recognised software (e.g. GLD, EED)
• Carry out and review:
• Heat loss and heat gain calculations (IES / Excel)
• Energy performance and operational data analysis
• Create, maintain, and review engineering calculation spreadsheets
• Act as the lead technical interface with clients
• Manage and maintain strong client relationships
• Lead day-to-day project delivery within:
• GED’s internal engineering team
• The client’s engineers and external consultants
• Review and understand:
• Client specifications
• Employer’s Requirements and Work Instructions
• Identify potential non-compliances, raise them proactively with the client, and develop mitigation strategies
• Manage Requests for Information (RFIs) and technical clarifications
• Review, approve, and issue:
• External meeting minutes and technical notes
• Support project management through:
• Internal budget control
• Support variation orders where scope changes occur
• Lead project handover activities

• Project & Client Leadership
• Act as the lead technical interface with clients
• Manage and maintain strong client relationships
• Lead day-to-day project delivery within:
• GED’s internal engineering team
• The client’s engineers and external consultants
• Review and understand:
• Client specifications
• Employer’s Requirements and Work Instructions
• Identify potential non-compliances, raise them proactively with the client, and develop mitigation strategies
• Manage Requests for Information (RFIs) and technical clarifications
• Review, approve, and issue:
• External meeting minutes and technical notes
• Support project management through:
• Scope definition
• Programme management
• Internal budget control
• Support variation orders where scope changes occur
• Lead project handover activities

• Design Coordination & Quality Assurance
• Lead mechanical design coordination at RIBA Stages 1–2 with Architects, Electrical, structural, and BMS designers
• Support mechanical coordination at RIBA Stages 3–4, ensuring design intent is maintained
• Review and approve developed and detailed designs
• Ensure all designs are technically robust, coordinated across disciplines, and fully compliant with relevant standards and guidance
• Support and participate in external design reviews and independent technical validation

• Site, Installation & Operational Support
• Attend and contribute to initial site surveys and design development meetings
• Carry out or support installation inspections and snagging
• System troubleshooting and remedial strategy development
• Support remote monitoring, seasonal commissioning, and review of as-built documentation

• Mentoring & Team Development
• Mentor and support Intermediate and Junior Engineers
• Review calculations, drawings, and reports produced by junior team members
• Provide structured technical feedback and guidance
• Contribute to the development of GED’s design standards, calculation tools, and engineering workflows and best practices

• BEng / MEng / MSc in Mechanical Engineering, Building Services Engineering, or a related discipline
• Extensive depth of professional experience in mechanical building services, geothermal, or low-carbon energy system design
• Strong technical capability in geothermal and ground source heat pump systems, mechanical building services design, and low-carbon heating and…