team

David O’Brien began his career in 1975 as a machine operator in the groundworks sector, contributing to major civil engineering projects with Dermot Reilly & Mulcair Civil Engineering (later known as Roadbridge). After gaining extensive experience in infrastructure development, he founded Trimplant in 1989. Under his leadership, the company grew into a well-respected name, successfully completing site development projects across large-scale infrastructure, residential, and commercial sectors, including notable projects like Fiachra’s Garden at the National Stud in Co. Kildare and the development of Citywest Business Park.

In 2003, David ventured into the hospitality industry, embarking on the development of the four-star Trim Castle Hotel. After years of careful planning and construction, the hotel opened in 2006. He successfully managed the hotel for 17 years before selling it in 2023.

Today, David remains an influential figure in the industry, advising and mentoring his son Andrew, who currently serves as the Managing Director of Trimplant. His decades of expertise and commitment have left a lasting legacy in both the construction and hospitality sectors.

Andrew O’Brien developed a strong passion for construction from an early age, growing up surrounded by plant and machinery. Gaining early on-site experience before the introduction of the “Safe Pass,” he was able to immerse himself in the industry firsthand.

After completing his education at Clongowes Wood College in 2008, Andrew faced the challenges of the global economic downturn, which resulted in limited opportunities in the construction sector. However, as the industry gradually recovered in 2012, he re-entered the field, accumulating over a decade of experience in demolition and civil engineering sectors.

In 2023, Andrew relaunched Trimplant, driven by his experience in machinery, demolition, and civil engineering. Under his leadership, the company has grown to be a prominent player in the industry, focusing on modern methods, advanced machinery, and a commitment to quality and safety. Today, he continues to drive Trimplant’s growth while maintaining its high standards.)

Pat Canty graduated in 2001 with a BA honours degree in Civil, Structural & Environmental Engineering and a BA in Mathematics from Trinity College Dublin. He began his career working on the Dublin Port Tunnel, where he contributed to both the design and site management aspects. After three years, Pat joined Trimplant, working under Michael Sheridan’s guidance, where he built a solid foundation in site management, engineering, and construction operations.

Over the past 20 years, Pat has led engineering efforts on numerous residential, commercial, and industrial projects, gaining extensive experience across various developments. Now back at Trimplant, he applies his expertise to efficiently manage sites, ensuring projects are completed with precision, quality, and efficiency. His leadership continues to be a valuable asset to the company.

Gary Woodruffe is an experienced and highly skilled machine operator, specializing in concreting and pipe laying. With over 20 years in the industry, Gary has developed a comprehensive understanding of site operations, which has naturally led to his progression into the role of Site Foreman.

Recognized for his strong communication skills, Gary collaborates effectively with site management, colleagues, and subcontractors to ensure seamless and efficient project execution. His commitment to quality, precision, and site safety is evident in every aspect of his work.

As the first employee to join Andrew in the re-establishment of Trimplant, Gary has played a crucial role in the company’s growth and continued success. He remains a valued advisor and trusted team member, offering leadership, experience, and a hands-on approach that drives Trimplant forward.

Rory is an experienced Senior Quantity Surveyor with a strong commercial track record across civil, structural, and architectural works on high-value projects, including data centres and complex public-realm developments. Beginning his career with hands-on site experience, he has developed into a commercially astute professional known for accuracy, proactive communication, and consistent value delivery.

Rory had lead the commercial management of multiple large hard-landscaping projects in central London, overseeing subcontract procurement, contract administration, change management, monthly CVR reporting, and final account settlement.

Before joining our team, Rory delivered major civil works packages on large-scale data centre projects and managed significant upstream and downstream change accounts. He brings broad contract experience across JCT, NEC, and bespoke forms, along with a strong ability to drive clarity and control throughout the project lifecycle.

Rory was educated in Clongowes Wood College and followed on to completing a B.Sc in Quantity Surveying & Construction Economics from Technological University Dublin, graduating with a Second Class Honours, First Division.

Rory is a key member of the team, playing a central role in driving Trimplant to the next level. With his deep commercial expertise, proactive approach, and commitment to high-quality delivery, he strengthens our capability on every project and contributes directly to the company’s ongoing growth and innovation.

Ben Holden is a Junior Civil Engineer with a long-standing interest in construction, developing a particular passion for civil works and demolition from an early age. He completed his Leaving Certificate in 2020 before progressing to a Level 8 degree in Civil Engineering at Technological University Dublin, graduating with an Honours degree in 2025.

Ben takes a hands-on, practical approach to his work. He is responsible for all of Trimplant’s setting out and surveying, utilising the latest GPS technology to ensure accuracy and efficiency on site. Ben also steps into site management roles on selected projects, overseeing day-to-day operations, site safety, and assisting Rory with project financials.

With ongoing mentorship from Pat and Andrew, Ben is quickly becoming an invaluable asset to Trimplant — contributing directly to the company’s growth and helping solidify its position as a leading force in Ireland’s civil and demolition industry.