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)

About the Role

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.

Key Responsibilities

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.

Qualifications & Experience

Required:

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.

Desirable

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.

Why Join Us?

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