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Leadership Team

Cillian Kelly - FLATT Associate Director
Having worked on both sides of the industry, from the tools to engineering consultancy, I understand the importance of designs that work in practice. I'm looking forward to bringing that perspective to FLATT, building a strong team and delivering solutions that work for our clients.
Cillian Kelly
Associate Director
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Cillian Kelly

Associate Director

Qualifications: HND, BEng (Hons) in progress

Flatt Consulting

October 2026
A technically grounded, commercially minded Mechanical Engineer and Team Builder

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Summary of profile:

My career in building services began in the gas trade, where I spent several years developing hands-on experience in heating systems, installations and maintenance. This gave me a strong understanding of how buildings work in practice and provided a solid foundation for my progression into mechanical engineering and building services consultancy.

Since moving into consultancy in 2014, I have spent over a decade delivering mechanical design and managing projects across a range of sectors, including commercial, high-end residential and healthcare. I have worked across the full project lifecycle, from concept through to completion, covering RIBA Stages 1–6. My experience includes major commercial refurbishments and large-scale residential developments, with M&E packages valued at up to £26 million.

Throughout my career, I have taken ownership of projects from early design through to delivery, working closely with clients, contractors and multidisciplinary teams to develop practical, commercially viable engineering solutions. I have also held senior engineering roles, mentoring junior engineers, supporting team development and ensuring projects are delivered to a high technical standard.

Alongside project delivery, I have developed a strong track record in business development and building long-term client relationships. I enjoy identifying new opportunities, developing connections and working collaboratively with clients to understand their needs and deliver the right outcomes. I believe that combining technical expertise with a practical, commercially aware approach is key to successful project delivery.

As an Associate Director at FLATT, I will lead my own team, drawing on my experience in mechanical engineering, project delivery and client development to support the continued growth of the business. I look forward to building strong relationships, developing talented engineers and delivering high-quality solutions for our clients.

Outside of engineering:

Outside work, I am a black belt in Jiu-Jitsu and enjoy spending time outdoors. I also speak four languages: Irish, German, English and Danish.

Key projects:

  • Eastfields Regeneration, Merton. 800 residential units, £26M M&E.
  • Colindale Gardens Phase 3. 1,200 residential units, £24M M&E, as part of a larger team.
  • Guildford Station Regeneration. 432 units, £19M M&E, including the Gateway 2 submission.
  • 150 Cheapside, London. Full CAT B refurbishment, £13M M&E, plus decarbonisation feasibility to RIBA Stage 3.
  • Central Middlesex Hospital, London. £5M M&E healthcare project.
  • H&M stores across the UK and Ireland. £1.5–3.0M M&E per site.
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