Principal Sustainability Consultant

Purosearch; Cardiff; Hybrid; GBP 65,000 - 90,000; Full time

Benefits offered by this job

Flexible hybrid working

Healthcare

Generous pension

Job summary

Purosearch is seeking a Principal Energy & Building Simulation Consultant to lead dynamic thermal modelling projects in Cardiff (with Bristol option). The role combines technical authority with client liaison, delivering rigorous energy studies and net-zero strategies within commercial, residential and public sector schemes.

The successful candidate will own IES VE modelling, advise on Part L and Part O compliance, and mentor junior staff while driving high quality outcomes for a growing

Qualifications

• Extensive hands-on experience using IES VE for dynamic thermal simulation.
• In-depth knowledge of Part L and Part O regulatory standards and methodologies.
• Proven consultancy experience with strong project leadership capabilities.
• Excellent communication skills, both written and client-facing.

Responsibilities

• Lead advanced dynamic thermal simulations using IES VE to evaluate energy performance and thermal comfort.
• Oversee Building Regulations compliance testing for Part L and Part O.
• Deliver TM59/TM54 assessments and related design-stage analyses.
• Manage client relationships and present energy strategies to design teams and developers.
• Mentor junior consultants and review IES models to ensure quality.

Skills

IES VE

Part L/Part O

Team leadership

Client communication

Tools

IES VE software

Job description

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