Business Details
Sustainable Building Services & Engineering Consultancy
C B G Consultants are a leading independent, sustainability-led, low-carbon design-focused engineering consultancy delivering mechanical, electrical, and public health (MEP) engineering, sustainability, and specialist lighting consultancy services across the UK. With offices in Oxford, London, Birmingham, Manchester, and Cambridge, we combine over 25 years of collective leadership experience with a team of 60+ professionals, including engineers, designers, and project managers. Our expertise spans building physics, Passivhaus standards, and BIM implementation, with a focus on optimising building efficiency through cutting-edge design solutions. We prioritise collaboration, utilising advanced software tools to ensure projects meet regulatory requirements while exceeding client expectations.Our commitment to excellence is demonstrated through accreditations such as ISO 9001 and ISO 14001, alongside partnerships with institutions like the Passivhaus Trust. By integrating sustainable practices into every project phasefrom concept to completionwe deliver tailored solutions for sectors including commercial, healthcare, heritage, and education. Our acquisition of Light Perceptions Ltd in 2023 expanded our capabilities, enabling comprehensive lighting design services that balance technical precision with environmental responsibility.
Services
MEP Engineering
Specialist Lighting Design
BIM Implementation
Sustainability Consultancy
Building Physics
Passivhaus Standards
Energy Audits
Thermal Modelling
Daylight Analysis
Overheating Risk Assessments
Highlights and features
- We offer 25+ years of collective leadership experience in sustainable engineering
- Our ISO 9001 and ISO 14001 accreditations ensure quality and environmental excellence
- We implement BIM Level 2 for coordinated, data-driven project delivery
- Our team includes Passivhaus-certified consultants and lighting design specialists
- We provide tailored solutions across 7+ sectors including heritage and healthcare
Associations and certifications
- ISO 9001
- ISO 14001
- BSRIA
- CIBSE
- CHAS
- SafeContractor
- Passivhaus Trust
What people say
Successfully completed to deadline
Delivered to budget
Excellent support
High standards
Energy savings
Services
MEP Engineering
Our mechanical, electrical, and public health engineering services integrate sustainable design principles with technical precision. We deliver HVAC, power distribution, and sanitation systems that enhance occupant comfort while minimising energy consumption. Through BIM coordination and compliance with standards like CIBSE TM52, we ensure systems are efficient, maintainable, and future-proof across commercial, healthcare, and educational sectors.
Passivhaus Consultancy
We specialise in German-standard Passivhaus design, achieving 90% energy savings through airtight construction, thermal bridging elimination, and heat recovery ventilation. Our consultants use PHPP software to optimise building envelopes, ensuring compliance with rigorous performance metrics while maintaining occupant comfort and indoor air quality for residential and commercial projects.
Building Physics
Our building physics expertise addresses heat transfer, acoustics, and daylight optimisation using dynamic thermal modelling. We conduct overheating risk assessments, climate-based daylight simulations, and SAP calculations to balance energy efficiency with occupant wellbeing, ensuring compliance with Part L regulations and London Plan requirements.
Specialist Lighting Design
We create lighting schemes that combine functionality, aesthetics, and energy efficiency. Our services include photometric analysis, daylight integration, and TM65 embodied carbon assessments. From historic cathedrals to modern schools, we utilise BIM coordination to deliver lighting systems that enhance architectural features while meeting BS EN 12464-1 standards.
BIM Implementation
We employ BIM Level 2 standards using Revit and Navisworks for coordinated MEP and lighting design. Our COBie-compliant models streamline construction processes, reduce clashes, and support lifecycle management. This approach ensures compliance with ISO 19650 and enhances collaboration across multidisciplinary teams for projects ranging from hospitals to transport infrastructure.
Questions
What is Passivhaus and how does it benefit buildings?
Passivhaus is a German energy efficiency standard achieving up to 90% heating savings through airtight construction, triple glazing, and heat recovery ventilation. Benefits include lower energy bills, superior indoor air quality, and reduced environmental impact.
How does BIM improve construction projects?
BIM enables coordinated 3D modelling of building systems, reducing design clashes and construction delays. It supports data-driven decision-making for cost estimation, material optimisation, and lifecycle management, ensuring compliance with ISO 19650 standards.
What sustainability services do you offer?
We provide BREEAM assessments, energy audits, renewable feasibility studies, and overheating risk analysis. Our services align with net-zero targets through fabric-first design, daylight optimisation, and low-carbon technology integration.
Can you work on heritage buildings?
Yes, we specialise in Grade I and II listed buildings, delivering MEP upgrades and lighting design that preserve historical integrity while meeting modern efficiency standards, as demonstrated in projects at Blenheim Palace and St Paul's Cathedral.
How do you ensure building thermal comfort?
We use dynamic thermal modelling to balance insulation, ventilation, and solar gain. Our solutions prevent overheating, maintain consistent temperatures, and comply with CIBSE TM52 criteria while minimising mechanical cooling requirements.
What sectors do you specialise in?
We serve commercial, healthcare, education, heritage, residential, and transport sectors, offering tailored MEP engineering, lighting design, and sustainability consultancy for projects ranging from new builds to heritage refurbishments.
