Overheating Assessments

At Verdant Eco, our Portsmouth-based assessors carry out professional overheating assessments to ensure your building remains comfortable, safe, and fully compliant with Building Regulations Part O. We support domestic, commercial, and retrofit projects in Portsmouth and across the UK, using approved software and advanced 3D dynamic thermal modelling in accordance with CIBSE TM59. Our assessments provide clear guidance to help you meet compliance requirements while improving long-term building performance.

Overheating Assessments We Provide 

Overheating assessments measure how a building performs during warm weather, confirming that effective passive design strategies are in place to control internal temperatures without relying on mechanical cooling. Our qualified assessors analyse key factors including glazing, shading, ventilation, building fabric, thermal mass, orientation, window design, and internal heat gains. Using industry-approved modelling tools, we produce accurate, compliant reports along with practical recommendations to reduce overheating risk, improve occupant comfort, and support efficient, regulation-compliant design.

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What Our Clients Say

  • As a commercial landlord, my previous EPC had expired, so I required a new one to ensure I was compliant. I instructed Verdant Eco to complete the EPC, and I couldn’t be more pleased with the service. They were highly responsive and communicated excellently throughout the entire process. The service was top-notch from start to finish. I would definitely recommend Verdant Eco without hesitation.

    Mr D. Beresford
  • As a charity organization, monies are always tight, but Verdant Eco was incredibly understanding of our situation. We needed an EPC for funding purposes, and Glen from Verdant Eco was kind enough to consult for us free of charge. Their response time was excellent, and they provided a prompt, friendly, and honest assessment. They were transparent and advised that pursuing funding wasn't the most cost-effective option for us, which we truly appreciated. Communication was outstanding from start to finish. I would definitely recommend Verdant Eco for their excellent service and honest advice.

    Annie Clewlow (Manager)
    Communicare in Southampton & Southampton Mental Health Network
  • I was recommended to speak to Glen when I needed an EPC to sell my property, and I'm very glad I followed that advice. The team was highly responsive, communication was clear and professional. I would not hesitate to recommend them to others.

    Andrew Waring
    AWA Consulting Structural & Civil Engineers
  • I recently needed an EPC for my properties at Roxby Garage/Newtown Road MOT Centre, as part of the legal requirements for selling. I was pleasantly surprised by the response from Verdant Eco. Not only was their service quick and efficient, but they also didn’t recommend any unnecessary work since the properties sailed through the testing. I’m 100% satisfied with the service and would highly recommend Verdant Eco to anyone in need of EPC services. The excellent service I received from Verdant Eco was due in no small measure due to the highly professional work carried out by Glen Crump. A truly great experience from start to finish!

    Mr P Trewick
    Roxby Garage/Newtown Road MOT Centre
  • I needed an EPC to renew my rental agreement with the Council and approached the team at Verdant Eco. The response rate was exceptional, and they quickly provided clear recommendations on what could be done to improve the property's rating. I was 100% satisfied with the communication throughout the process, and their knowledge was impressive. I would highly recommend them to anyone else needing similar services.

    Adam Wilde
    Duo Barbers
  • We recently sold an industrial site and were initially unaware that EPCs were required as part of the process. Verdant Eco’s team was outstanding—they provided clear guidance and support every step of the way. Their response times were exceptional, and their overall communication was seamless and efficient. We couldn’t have asked for better service. We’d absolutely recommend Verdant Eco without hesitation.

    N. Jefferies & A. Skillman
    Bridge Industries
  • We needed a commercial EPC for an office property we let, and Verdant Eco delivered exactly what we needed. The service was good, with great response times and clear communication throughout. I’d definitely recommend Verdant Eco for this service.
    Richard Allen
    SLS Construction
  • We would highly recommend Verdant Eco for any concerns, queries and problems relating to Energy Performance Certificates. Glen is an expert in his field, with exceptional experience and knowledge. Verdant Eco are an approachable, professional and solution-focused company - whose principals of sustainability are admirable. We are grateful to work alongside such an exceptional brand, who consistently demonstrate excellent communication.

    Becci Oldman
    Hiltingbury Interiors