An EPC is a formal assessment document that assigns a property an energy efficiency rating from A to G. It is based on its construction, insulation, heating systems, and other energy-related factors. It also estimates annual running costs and recommends targeted improvements. The standard that governs an energy performance certificate in the United Kingdom is applied consistently. This means all assessors use the same approved methodology regardless of where the property is located.
In a city where many properties date back over a century, energy performance ratings often reflect the challenges of older construction. For Portsmouth landlords, this makes obtaining an up-to-date assessment particularly important. The energy rating certificate in the UK system gives owners a clear picture of where their property stands today. A commercial EPC in Portsmouth also points out what investment would be needed to bring it in line with current and forthcoming minimum standards.
Portsmouth’s commercial landscape includes warehousing near the port, office blocks in the city centre, and retail premises spread across Gunwharf Quays and the surrounding areas. Each of these property types carries the same legal obligation. Before any commercial building can be marketed for sale or rent, a valid EPC for commercial property in Portsmouth must be available to prospective buyers or tenants. Tandem Energy handles assessments for all commercial building types and complexity levels.
Missing a valid commercial EPC can result in costly penalties and legal complications. Fines for non-compliance typically range from £500 to £5,000 based on the property’s valuation. Failure to comply can also block property transactions, resulting in delays and potential loss of income.




Tandem Energy is an award-winning sustainability consultancy based in West Sussex, recognised as Sustainability Consultancy of the Year. Our team has been delivering fully accredited commercial assessments across Portsmouth and the wider South Coast since 2015. We have built a reputation on speed, accuracy, and straightforward service.
Here’s why so many people trust us with their EPCs:
Every member of our team holds current non-domestic energy assessor accreditation and commits to ongoing professional development to stay current with regulation changes.
We move efficiently from quote to appointment to certificate. This way your transaction, letting, or compliance deadline is never held up by paperwork.
Our commercial Energy Assessor in Portsmouth plans every visit around the realities of your premises. This can mean early starts, specific access windows, or coordinating with tenants.
Our pricing is based on your actual building, not a generic rate card. So, you always know what you are paying and why.