About Thomas — the person behind EnviroHill
Independent BREEAM Expert & Assessor helping building owners and consultants certify and improve existing buildings — with practical, well-founded sustainability strategies.
EnviroHill combines my surname with my mission: helping organisations make buildings greener, healthier and more future-proof.
As an independent consultant with certifications in BREEAM, WELL, GPR and LEED, I combine hands-on project experience with a flexible, personal approach. Whether it's a quickscan, expert guidance or support with certification — my goal is to turn sustainability ambitions into achievable steps.
Because I've worked as both an Expert and an Assessor, I know exactly what evidence, quality and wording a credit needs. That makes my assessments run smoothly and my guidance realistic.
How I work on sustainable buildings
Independence
I don't work from standard templates. My advice is tailored to the building, the ambitions and the operational reality — no generic checklist.
Collaboration
I work together with owners, facility managers and consultants to develop clear, workable solutions — no reports that disappear into a drawer.
No greenwashing
My focus is on measurable, realistic improvements and honest assessments — even when that means fewer points are achieved, or progress happens step by step.
Who I typically work with
My projects focus mainly on existing buildings and organisations looking to improve or certify their sustainability performance.
- Property owners and investors looking to certify their buildings or make them future-proof
- Facility managers and property managers who want insight into their buildings' current sustainability performance
- Sustainability and BREEAM consultants who need support with assessments or complex projects
- Project teams working on BREEAM In-Use or New Construction certifications
Vision & mission
VISION
Sustainable and healthy as the standard
A built environment where existing buildings are used sustainably and healthily, without unnecessary demolition or new construction. My goal is to make sustainable and healthy buildings the standard — not the exception.
MISSION
Turning ambitions into achievable steps
Helping organisations translate sustainability ambitions into concrete, achievable improvements — through clear guidance, realistic strategies and reliable certification processes.
Hands-on experience, personally delivered
EnviroHill is deliberately a small, personal practice. You work directly with me — no layers in between, short lines of communication, and someone who knows your project from start to finish.
Outside of work, I enjoy spending time writing, hiking and exploring ideas around the future of the built environment. Those moments away from projects are often exactly where the insights come from that later become practical solutions for my clients.
- Independent, self-employed consultant
- Experience as both Expert and Assessor
- Active nationally & internationally
- In collaboration with GreenBuildingCoach
- Personal contact, from intake to certificate
Qualified across multiple standards
BREEAM-NL Expert
New Construction & Renovation
BREEAM NSO Expert
In-Use
BREEAM NSO Assessor
New Construction & Renovation
BREEAM NSO Assessor
In-Use
WELL AP
WELL Accredited Professional
LEED AP
ID+C & BD+C
GPR Gebouw Expert
New Construction & Renovation / In-Use
GPR Gebouw Assessor
New Construction & Renovation / In-Use
Curious what I can do for your building?
Start with a quickscan or a short introductory conversation. I usually respond within two working days.
tchillman@envirohill.com