Built on experience, focused on your energy future
Welcome to DOR Energy & Retrofit Assessors. Learn about our journey, our unique approach rooted in over two decades of construction expertise, and our commitment to clear, trustworthy energy and retrofit assessments across North Wales.
A foundation of expertise
I’m Dafydd Roberts, founder of D.O.R Energy & Retrofit Assessors, based in Anglesey, North Wales. With over 20 years’ experience as a builder, roofer and stonemason—including award-winning restoration and barn conversion projects—I understand buildings from the ground up. Becoming a qualified Domestic Energy Assessor and Retrofit Assessor was a natural progression. I’ve spent two decades improving buildings physically—now I help property owners understand and improve their energy performance properly and realistically.
What makes us different
What makes DOR Energy & Retrofit Assessors stand out is the combination of over 20 years of hands-on construction experience with professional energy assessment qualifications. Unlike many assessors who come purely from an administrative or survey background, I have worked on buildings from the ground up—including traditional Welsh stone properties, restorations and barn conversions. This practical experience means I understand how buildings actually perform in real conditions. I provide realistic, experience-led advice rather than generic recommendations.
Personal, professional, reliable
My construction background means: I understand traditional Welsh stone buildings; I know what improvements are practical (and what aren’t); I provide clear, jargon-free advice; and I care about doing things properly. Whether you’re a homeowner, landlord or housing provider, you’ll receive a professional, reliable service with practical insight behind it. As a local independent assessor serving North Wales and the North West of England, clients also benefit from a personal, responsive service with clear communication, transparent pricing and a focus on doing the job properly.
"The most important message we want people to take away is confidence and reassurance. Energy assessments and regulations can feel technical and overwhelming, but the process doesn’t have to be."
Dafydd Roberts, founder of DOR Energy & Retrofit Assessors