Design Engineer - Renewables

Unify; Cardiff; On-site; GBP 35,000 - 40,000; Full time

Benefits offered by this job

Company pension

Company vehicle for site visits

Mobile phone

Job summary

Unify is seeking a technically minded Renewables Design Specialist to lead the design, specification and optimisation of low-carbon energy systems for domestic and commercial installations in South Wales.

You will ensure designs meet MCS, Building Regulations and industry best practice. The role involves collaborating with project teams to deliver load calculations, component spec, and compliant documentation from site surveys to commissioning.

Qualifications

• Minimum 3 years’ experience in renewable energy system design.
• Working knowledge of MCS, PAS 2035, and Building Regulations Part L.
• Proficiency in relevant design software.
• Strong understanding of electrical design principles and grid connection requirements (G98/G99).
• Excellent communication skills and attention to technical detail.
• Ability to manage multiple projects and meet deadlines.
• Experience within retrofit or social housing decarbonisation programmes.
• Understanding of SAP, EPCs, and energy modelling methodologies.

Responsibilities

• Produce detailed technical designs, schematics, and layout drawings for solar PV, battery storage, ASHP, and ventilation systems (PIV, dMEV).
• Carry out load, yield, and performance calculations using specialist design software.
• Specify components and materials to ensure efficiency, quality, and cost-effectiveness.
• Prepare technical documentation for installation teams, subcontractors, and customers.
• Ensure compliance with MCS standards, BS 7671 wiring regulations, and manufacturer requirements.
• Conduct feasibility assessments and energy modelling based on site surveys, EPC data, and client needs.
• Ensure all designs and documentation meet PAS 2030/2035, TrustMark, MCS, and planning standards.
• Review and sign off commissioning documentation and as-built drawings.
• Collaborate with Project Managers, Retrofit Coordinators, and Installers to maintain design intent.
• Provide technical support and problem-solving during installation and commissioning.

Skills

Renewable energy design

Load & performance calculations

Design software proficiency

Electrical design principles

Project management

Communication skills

Tools

Design software

Job description

Renewables Design Specialist

Location: Cardiff

Salary: £35,000 to £40,000 (dependent on experience)

Contract Type: Full-time, Permanent

Reports to: Operations Manager

About the Role

UnifyHQ is proud to be working in partnership with our client, a leading energy efficiency provider delivering grant-funded retrofit solutions across South Wales. Their work spans solar PV, battery storage, air source heat pumps and insulation, with a strong focus on compliance, quality, and carbon reduction.

We are seeking a technically minded Renewables Design Specialist to lead the design, specification, and optimisation of low-carbon energy systems. This role supports domestic and commercial installations, ensuring all designs meet MCS standards, Building Regulations, and industry best practice.

Key Responsibilities

• Produce detailed technical designs, schematics, and layout drawings for solar PV, battery storage, ASHP, and ventilation systems (PIV, dMEV)


• Carry out load, yield, and performance calculations using specialist design software


• Specify components and materials to ensure efficiency, quality, and cost-effectiveness


• Prepare technical documentation for installation teams, subcontractors, and customers


• Ensure compliance with MCS standards, BS 7671 wiring regulations, and manufacturer requirements


• Conduct feasibility assessments and energy modelling based on site surveys, EPC data, and client needs


• Ensure all designs and documentation meet PAS 2030/2035, TrustMark, MCS, and planning standards


• Review and sign off commissioning documentation and as-built drawings


• Collaborate with Project Managers, Retrofit Coordinators, and Installers to maintain design intent


• Provide technical support and problem-solving during installation and commissioning

Candidate Profile

• Minimum 3 years’ experience in renewable energy system design


• Working knowledge of MCS, PAS 2035, and Building Regulations Part L


• Proficiency in relevant design software


• Strong understanding of electrical design principles and grid connection requirements (G98/G99)


• Excellent communication skills and attention to technical detail


• Ability to manage multiple projects and meet deadlines


• Experience within retrofit or social housing decarbonisation programmes


• Understanding of SAP, EPCs, and energy modelling methodologies

What’s on Offer

• Company pension


• Company vehicle for attending site visits


• Mobile phone


• Fast-paced and supportive team environment


• Opportunity to help shape commercial growth in the renewables sector