We’re the ONLY Sustainability Engineers in Ireland boasting an all-encompassing range of in-house Green Building Accreditations. 

This uniquely positions us to provide the most comprehensive ESG guidance countrywide.


Ciarán McCabe


Chartered Engineer

LEED AP BD+C Domestic and on-Domestic BER assessor LEED Green Rater

Ciarán McCabe

Ciarán is a distinguished Chartered Engineer with over 15 years of expertise as a Building Services Engineer, specialising in Sustainability in the Built Environment. His career to date encompasses roles with various esteemed M&E consultancies across Ireland and the UK, culminating in the founding of Passive Dynamics in 2020.

Ciarán utilises state-of-the-art Building Performance Simulation Software to devise optimal solutions. His profound technical expertise in conceptual energy analysis, building physics, commissioning management, and green building certification consistently delivers exceptional value to building owners, design teams, and corporate clients. Notably, Ciarán was the first to achieve LEED Green Rater accreditation in Ireland.

Ciarán is dedicated to understanding the needs of clients and enhancing design performance beyond mere compliance. For him, it’s not just about meeting minimum standards but achieving the best sustainable design solutions. Ciarán believes in pushing boundaries, adopting International best practice and designing for performance while maintaining practical low carbon solutions.

Eoin Gahan


LEED Commissioning Agent including onsite verification Engineer

HPI Assessor

Eoin Gahan

Eoin joined Passive Dynamics in January 2021 with expertise and has a keen interest in building energy performance. Eoin has a degree in Building Services Engineering and a Post Graduate Diploma in Energy Management from DIT. He has a wide range of experience from engineering design to site-based project management.

Eoin is a commissioning agent with Passive Dynamics and has a keen interest in building optimisation. The commissioning agent role applies systematic method of assuring that all building systems perform according to design standards and meet the needs/desires of the owner. The end goal is to deliver a building where all the building services are operating as intended and as efficiently as possible.

Eoin believes that sustainable engineering focuses on employing strategies which reduce the environmental impact of construction in the built environment.

John Treanor

Associate Director

Chartered Engineer

LEED Modelling & Overall LEED Project Support Engineer Fitwell Ambassador. LEED AP O+M accredited.

John joined Passive Dynamics in February 2021 as a sustainability engineer. John gained experience in sustainable design and green building rating systems whilst working with detailed energy models as part of a sustainability team prior to joining Passive Dynamics.

Having completed a BEng in Building Services Engineering from Technological University Dublin in 2020, John has developed a comprehensive understanding of mechanical and electrical systems within the built environment with a focus on minimising their overall energy use.

Since joining Passive Dynamics, John has broadened his skillset, delivering a wide range of sustainability services to our clients including Advanced Energy Modelling, Net Zero Carbon Analysis, Natural Ventilation/Overheating Analysis, Part L and BER Assessments and Daylight/Sunlight Analysis. John also manages projects pursuing green building certification such as LEED – ensuring that the requirements of the rating system are captured from early design stage through to the commissioning phase and final LEED certification.

He is keen to expand his knowledge in all facets of sustainability within the built environment with a particular interest in supporting project teams in designing net zero carbon buildings through the use of innovative low-energy technologies, ongoing detailed energy modelling and applying Green Engineering Solutions. 


Sustainability engineers

Liam Guinan

Senior Sustainability Engineer

Non-Domestic BER Assessor
LEED Project Support Engineer.

Liam joined Passive Dynamics in June 2022 as a Sustainability engineer. He had gained experience in sustainable design and green building rating systems whilst working across a variety of projects as part of a sustainability team prior to joining Passive Dynamics. 

Having completed a BEng in Energy Systems Engineering from ITT (now Technology University of Dublin) in 2017, Liam has developed a comprehensive knowledge of the built environment with a focus on Reduction of energy use and carbon emissions through thermal modelling of building performance and development of energy strategies to ensure Low Carbon Design is and the key driver in the industry.

Since joining Passive Dynamics, Liam has developed his skillsets in the areas of passive design strategies and Low zero carbon feasibility studies to inform the design performance targets of clients, delivering a wide range of sustainability services to our clients including Thermal Load analysis, TGD Part L / NZEB Compliance assessments, Overheating Risk assessments and mitigation strategies, Daylight Sunlight and Shadow Impact analysis, Visual comfort analysis, Non-Domestic BER assessment and LEED certification across several different project types.

As part of his role Liam manages projects pursuing green building certification such as LEED – ensuring that the requirements of the rating system are captured from inception through to handover and final LEED certification.

He is keen to broaden his knowledge base in the ever expanding and crucial area of Sustainability in the built environment. Liam gets huge satisfaction in delivering sustainable solutions in today’s construction industry.

David Devlin

Senior Sustainability Engineer

HPI Assessor

David joined Passive Dynamics in August 2022 after having previously worked in the HVAC industry for 4 years.

From his previous experience he was involved in HVAC system specifications for a range of residential and commercial projects.

Since joining Passive Dynamics he’s developed his sustainability and building services knowledge by working on overheating assessments, energy modelling and ensuring buildings are compliant with Part L.

David is a registered BER assessor (Domestic and Non-Domestic), Home Performance Index assessor, heat pump technical advisor and a passive house designer. He’s also experienced with other green building accreditations such as LEED and EU Taxonomy alignment. David is keen to work on innovative projects which push the boundaries on energy and carbon performance.

Luke Farrell

Sustainability Engineer

Luke joined Passive Dynamics in July 2021 as a Sustainability Engineer. Having completed a BEng within the Built Environment from Technological University Dublin in 2020. 

Since joining, Luke’s focus has been using IES VE to work on daylight studies, overheating modelling and Building Compliance. In recent months Luke has begun working on many LEED jobs and is currently working towards becoming a LEED GA.

He is keen to expand his knowledge in the wider areas of sustainability and hopes to continue learning about renewable technologies and their applications in building services.


energy engineers

Adrián Bes

Architect & Sustainability Consultant

MS Architecture

Adrian Bés

Adrián is an Architect, he joined our team in September 2023.

His expertise in architecture brings a unique and invaluable perspective to both our clients and our team. This background enables us to embrace a comprehensive approach to sustainability consulting, going beyond the conventional checklist to innovate and redefine the standards of sustainability within the built environment.

Since joining us in the role of Sustainability Consultant, Adrián has made substantial contributions towards achieving our sustainability goals. His dedication and innovative approach have been instrumental in advancing our mission.

His skills include Building Physics, Dynamic Simulation, Energy Modelling and Building Codes.

Adrián has a Masters in Architecture and a Postgraduate Diploma in Architecture, both from Technological University, Dublin. 

Osama AlHanbali

Sustainability Engineer

MS Energy Systems
Civil Engineer

Osama AlHanbali

Osama joined the team in early 2024. He is educated at the University of Galway with a Master’s in Energy Systems and holds a Bachelor’s degree in Civil Engineering from Sultan Qaboos University. 

He brings a wealth of knowledge and experience to our team and has an extensive background in engineering and sustainability. His skillset covers everything from health and safety oversight to energy efficiency projects.

Osama’s hands-on experience in implementing ISO standards and his proactive approach in sustainability consulting help strengthen our position as Ireland’s only in-house team of Engineering Consultants focusing solely on Sustainability.



Ireland’s Only Sustainability Engineering Consultancy to hold all Green Building Accreditations in-house.

Meaning we offer the most comprehensive ESG Guidance in the country.

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