Principal Sustainability Consultant

Principal Energy & Thermal Modelling Consultant

Job Title:

Principal Consultant - Energy & Building Simulation

Location:

Primary location in Cardiff (Bristol location considered for the right candidate)

Work Type:
Full-time, Hybrid

Salary:
Competitive, dependent on experience (+ benefits)

We are seeking an experienced and ambitious Principal Energy & Building Simulation Consultant to join our expanding team in the Southwest and South Wales region.

This role is a key strategic priority for our team. The successful candidate will act as a technical authority on energy compliance and dynamic thermal modelling, driving net-zero strategies across a diverse portfolio of commercial, residential, and public sector projects. While the primary base for this role is Cardiff, we are also open to applicants based in Bristol.

• Technical Leadership & Operational Modelling:
  Lead advanced dynamic thermal simulation using IES VE to evaluate energy performance, operational energy consumption, and thermal comfort.
• Building Regulations & Compliance:
  Oversee compliance testing and verification across Part L (Conservation of fuel and power) and Part O (Overheating) of the Building Regulations.
• Thermal Comfort & Overheating Assessments:
  Deliver advanced thermal comfort assessments, including TM59 (residential overheating) and TM54 (evaluating operational energy use at design stage).
• Project Management & Client Liaison:
  Manage client relationships, present technical energy strategies to design teams, architects, and developers, and ensure timely project delivery.
• Mentorship & Quality Assurance:
  Mentor junior and mid-level consultants, review IES models, and uphold strict technical standards across all deliverables.
• Net Zero Strategies:
  Advise clients on decarbonisation pathways, net-zero carbon operational strategies, and sustainable building performance optimization.

• Extensive hands-on experience using IES Virtual Environment (IES VE) for dynamic thermal simulation.
• In-depth technical knowledge of Part L, Part O, TM54, and TM59 regulatory standards and methodologies.
• Proven track record in a consultancy environment with strong project leadership capabilities.
• Strong knowledge of building services, thermal performance, and HVAC systems.
• Excellent communication skills, both written and client-facing.

• Relevant energy accreditation (e.g., Low Carbon Energy Assessor - LCEA, NDEA Level 4/5, OCDEA).
• CEng status or working towards Chartered status with a relevant body (CIBSE, Energy Institute, etc.).
• Experience with NABERS UK or Passivhaus standards.

• Flexible hybrid working model balancing office and home working.
• Opportunity to lead high-profile sustainability initiatives across Wales and the Southwest.
• Clear pathway for career advancement to Director level.
• Competitive benefits package including healthcare, generous pension, and professional subscription support