About Greenslate Company
North Wales' trusted property compliance and energy assessment specialists — accredited, insured, and built around the needs of homeowners, landlords, and estate agents.
More Than an EPC Provider
Greenslate Company was founded to give property owners, residential landlords, and estate agents across North Wales a single, reliable source for every compliance and energy assessment they need. What began as a focused EPC service has grown into a comprehensive property compliance hub — covering Energy Performance Certificates, PAS 2035 Retrofit Assessments, Legionella Risk Assessments, Electrical Equipment Testing (EET), and professional 2D floor plans.
We are deeply familiar with the North Wales property landscape — from the Victorian terraces of Bangor and the traditional stone cottages of rural Gwynedd to the mix of modern and period homes across Anglesey. That local knowledge, combined with our full suite of accredited services, means you get accurate assessments, legally valid documentation, and a team that genuinely understands the properties it works with.
Accuracy
Every assessment is conducted thoroughly and reported precisely. Correct documentation protects your legal position, your tenants, and your investment.
Speed
We know delays cost money. Certificates and reports are typically issued the same day or next working day after assessment — keeping your projects and listings on schedule.
Transparency
No hidden fees, no jargon. We tell you exactly what to expect before we arrive and deliver precisely what we promise — every time.
Our Accreditations
Our credentials are not just badges — they are your assurance that every report we issue is accurate, legally valid, and professionally delivered.
Elmhurst Energy Accredited
Elmhurst Energy Accreditation SchemeElmhurst Energy is one of the UK's leading accreditation schemes for domestic and non-domestic energy assessors. Our Elmhurst accreditation means we are trained, assessed, and monitored to the highest professional standards — giving you complete confidence in every certificate and report we produce.
TrustMark Government Endorsed
TrustMark Government Endorsed QualityTrustMark is the only Government Endorsed Quality scheme covering work carried out in and around the home. Our TrustMark approval provides independent assurance that we operate to a verified standard of quality, customer service, and professional trading practices.
Fully Insured
Professional Indemnity & Public LiabilityWe carry full professional indemnity insurance and public liability insurance across all of our services. Whether we are conducting an EPC, a Legionella risk assessment, or a retrofit survey, you and your property are fully protected.
Deep Local Knowledge
North Wales has a diverse and distinctive property stock. We know it well.
From the Victorian and Edwardian terraces of Bangor city centre to the traditional Welsh stone cottages of rural Gwynedd, and the varied mix of modern and period properties across Anglesey — North Wales properties have their own characteristics. Solid stone walls, older heating systems, and traditional construction methods all require an assessor who understands what they are looking at. We do. That same local expertise underpins every service we offer, from energy assessments to water safety and electrical equipment testing.
Ready to Work With Greenslate Company?
Accredited, insured, and ready to help across North Wales. Get in touch and we will confirm your appointment quickly.