empowering energy efficiency -
​one home at a time

At Guillan Assessments & Surveys, we specialise in retrofit assessments and Energy Performance Certificates (EPCs) that meet the highest industry standards. As a PAS 2035–compliant, TrustMark-endorsed, and Trading Standards–approved company, we provide reliable, fully accredited services that ensure every project is energy efficient, compliant, and future-ready.
With over 10 years of hands-on experience in the construction industry, our team combines technical expertise with practical insight to deliver accurate assessments, clear reports, and trusted guidance — helping homeowners, landlords, and contractors make confident decisions for sustainable building performance.

Interested to see how we can help to improve your homes energy efficiency?
looking to lower your energy bills?
We cover the whole of Hampshire! 
Contact us through WhatsApp or call us on - 07950 889831 - 

Or you can register your email below and we will contact you within 24 hours. (Monday - Friday)