In Portugal, an Energy Performance Certificate (EPC) is mandatory whenever a property is sold or rented. But far from being just another document, it’s a direct indicator of comfort, efficiency, and market value and it can significantly influence how a property is perceived.
What is the Energy Performance Certificate?
The EPC is an official document issued by qualified experts accredited by ADENE, Portugal’s energy agency. It rates a property’s energy performance on a scale from A+ (highly efficient) to F (poor efficiency), based on its energy consumption for heating, cooling, and hot water.
Each certificate includes:
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Estimated energy use and CO₂ emissions;
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Recommendations for improving efficiency;
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Estimated costs and payback periods for each measure.
It’s valid for 10 years and must be presented whenever a property is placed on the market.
How to get one
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Choose a certified expert – you can find accredited professionals on the ADENE website.
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Schedule a technical visit – the expert will collect data on construction materials, windows, insulation, and energy systems.
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Receive your digital certificate once the report is registered and validated.
💰 Average cost: between €135 and €250, depending on the property’s size and type.
Why it matters and how it affects property value
A strong energy rating can increase a property’s market value by up to 10-20%, according to European studies.
Here’s why:
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Higher market appeal: buyers and tenants prefer energy-efficient homes with lower utility bills.
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Valuation impact: energy class is increasingly factored into professional appraisals.
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Green mortgage incentives: some banks offer lower interest rates for properties rated A or higher.
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Reputation and sustainability: energy efficiency reflects modern construction quality and environmental responsibility.
Conversely, properties with lower ratings (E or F) tend to lose value and may struggle to attract foreign or institutional buyers.
Simple ways to improve your EPC rating
Upgrading doesn’t always require major renovations. There are many small changes you can make that have a big impact. Such as:
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Replace single-glazed windows with double glazing and thermal break frames;
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Add insulation to walls, roofs, and ceilings;
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Install solar thermal panels for water heating;
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Replace old equipment with A+ rated systems or heat pumps;
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Use LED lighting and smart energy management systems.
The Energy Performance Certificate is, ultimately, a technical snapshot of a building’s quality and efficiency. It builds trust, ensures compliance, and adds real value, not just to the property itself, but also to the confidence of those investing in it.