Senior Mechanical Building Services Design Engineer

Company : J

Job Type : Full Time

United Kingdom

Number of Applicants

:

000+

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Job Description - 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

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
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
Design development meetings
Carry out or support:
Installation inspections and snagging
System troubleshooting and remedial strategy development
Support:
Remote monitoring
Seasonal commissioning
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
Engineering workflows and best practices

Essential

Skills & Qualifications

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
Low -carbon heating and cooling systems
Proficient in:
Building heat loss and heat gain calculations
HVAC system design and equipment sizing, including:
Heat transfer
Pressure drops
Psychrometrics
Pipework and ductwork sizing
Systems hydraulics and thermodynamics
Very good understanding of:
Heat pump operation, Rankine cycles, mechanical components, and control philosophy
Strong working knowledge of relevant standards and guidance, including:
CIBSE
BSRIA
GSHPA / IGSHPA
HWA
Relevant BS and EN standards
Proficient in:
AutoCAD
GLD / EED
Microsoft Office (Word, Excel, PowerPoint)
Strong technical writing and client presentation skills
Comfortable working in a small consultancy environment with high responsibility
Right to work and live in the UK.

Desirable

Chartered Engineer (CEng) or working towards chartership
Certified GeoExchange Designer (CGD) or working towards certification
Consultancy or client -facing experience
Experience supporting projects through construction, commissioning, and operation
Experience supervising or line -managing engineers
10+ years experience in mechanical building services, geothermal, or heating + cooling / low -carbon energy system design

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About the Company

J

About J&B Hopkins Since 1978, Hopkins has been a business built on family values that has grown from strength to strength. Currently, we have over 200 people working across the business. Some of whom have been with us since the beginning! Our ethos is to promote from within our own team whenever we...

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