About EnviroHill

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.

My approach

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 work with

Who I typically work with

My projects focus mainly on existing buildings and organisations looking to improve or certify their sustainability performance.

What I stand for

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.

 
What EnviroHill stands for

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.

Certifications & accreditations

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