The energy certificate (CE) is mandatory in any sale or rental in Portugal and is nonetheless one of the least-read documents. It states how much energy the home consumes for heating, cooling, ventilation and hot water, on a scale from A+ (very efficient) to F.
When it is required
Before listing: the certificate number must appear in the sale or rental advertisement. Selling or letting without a valid certificate is illegal and, in practice, blocks the deed and the contract. It is valid for ten years for housing, but lapses if the property undergoes significant works.
What the class means
The class results from comparing the property's estimated consumption with a reference value. It reflects the insulation of walls and roof, the window frames (double glazing with thermal break or not), the hot-water systems and ventilation. In Madeira's mild climate, comfort relies heavily on ventilation and shading, but the class also reflects envelope quality — and a damp, cold house in the island's higher-altitude winters is not rare.
What improves the rating most
- Window frames with double glazing and a thermal break: usually the improvement with the greatest effect;
- Roof insulation, more accessible than wall insulation;
- An efficient hot-water system, including solar thermal panels;
- Airtightness, which in Madeira also helps against damp.
The assessor lists the improvement measures with the best cost-benefit ratio in the certificate itself — the most useful page of the document.
Points of attention
- The certificate exists and is valid before listing.
- The certificate's area and typology match the property.
- The class in the listing is the certificate's, not the hoped-for one.
- Read the improvement-measures page before planning works.
- After significant works, issue a new certificate.