Energy Performance Certificates (EPCs) in Portugal are a legal requirement for all properties being sold or rented. The EPC assesses the energy efficiency of a building, rating it on a scale from A+ (most efficient) to F (least efficient). It also provides recommendations for improving energy performance, which can help reduce utility costs and environmental impact. The certificate must be issued by a certified assessor and is valid for 10 years.

Having a valid EPC is essential during property transactions, as it must be presented to prospective buyers or tenants before the deal is finalized. It also affects a property's market appeal—homes with higher efficiency ratings may attract more interest and potentially higher prices. In Portugal, energy efficiency is becoming increasingly important due to rising energy costs and growing awareness of sustainability, making the EPC not only a legal formality but also a valuable tool for property owners and investors.