The Certificado Energético in Portugal in 2026 — A Practical Guide to the Energy Rating You Need to Sell or Rent a Home, the A+ to F Scale, the ADENE Fees, the Perito Qualificado and the Fines for Getting It Wrong

If you are buying, selling or letting a home in Portugal, at some point a single lettered rating — A+ down to F — will decide how your property looks on paper to everyone else. That rating lives on the Certificado Energético, the energy performance certificate, and it is one of the few documents in a Portuguese property transaction that is legally required before you can even advertise. This guide explains what the certificate is, when you must have one, what it costs in 2026, how to get it, and the fines for skipping it.

What the Certificado Energético actually is

The Certificado de Desempenho Energético is an official document that rates how energy-efficient a building is and lists concrete recommendations for improving it. It is issued under the Sistema de Certificação Energética dos Edifícios (SCE, the Energy Certification System for Buildings), which is run by ADENE — Agência para a Energia (the national energy agency). There are two versions: one for residential buildings (habitação) and one for commercial and service buildings (comércio e serviços).

Crucially, you cannot produce one yourself. The certificate can only be issued by a perito qualificado (PQ, a qualified expert) recognised by ADENE. Each PQ registers the finished certificate on the SCE portal, where it is issued digitally with a unique registration number. ADENE keeps a public directory of qualified experts, so you can find and compare them directly rather than relying on whoever an estate agent suggests.

When you are legally required to have one

The certificate is mandatory in more situations than many newcomers expect. You need a valid one:

• When you sell a property — new or existing.
• When you rent or let a property.
• For new construction.
• For major renovations — broadly, works exceeding 25% of the building's value.

Two points trip people up. First, the certificate must exist before the property goes on the market, and the energy class must be shown in every advertisement, whether the listing is placed privately or by an agency. Second, the certificate must be presented to prospective buyers or tenants and handed over when the deal closes. Certain large public and service buildings also have to hold and publicly display a certificate; the exact floor-area thresholds are set in the governing law, so confirm them if you manage commercial space.

Reading the scale: A+ to F

Residential certificates use an eight-step scale: A+, A, B, B-, C, D, E and F, where A+ is the most efficient and F the least. Commercial and service buildings run one grade longer, adding a G at the bottom. New buildings must reach at least B- to be legal.

The class reflects how the building's estimated energy needs compare with a reference value for a building of its type — in essence, a ratio between predicted consumption and a benchmark. The lower your predicted energy demand relative to that benchmark, the higher your letter. It is worth being realistic: Portugal's housing stock skews inefficient, with a large share of buildings rated C or below and much older stock clustered in the D-to-F range, so a modest rating on an older flat is the norm rather than a red flag.

How long it lasts

• Residential buildings and small commercial/service buildings: valid for 10 years.
• Large service buildings (grandes edifícios de comércio e serviços): valid for 8 years.
• Pré-certificado (the pre-certificate issued at the project stage for a new build): 10 years.

A first certificate for a new large service building, or one issued after a major renovation of such a building, is reported to run for a shorter initial period before renewal. In all cases, a new certificate can — and sometimes must — be issued earlier if you carry out significant works or change the building's systems.

What it costs in 2026

The total price has two parts: a fixed ADENE registration fee (taxa de registo, plus VAT) and the PQ's professional fee, which is not regulated and set by the market.

The ADENE registration fees for homes, excluding VAT, are banded by typology:

• T0 / T1: €28.00
• T2 / T3: €40.50
• T4 / T5: €55.00
• T6 or larger: €65.00

For commercial and service buildings the registration fee scales with size, from about €135 for spaces up to 250 m² to roughly €950 for those above 5,000 m². On top of the registration fee, the perito's own fee typically runs between €120 and €300 for a home in an urban area, and more for larger, more complex, coastal or remote-rural properties. Because the professional fee is unregulated, getting two or three quotes is the single easiest way to save money.

The process, step by step

1. Find a perito qualificado through ADENE's SCE portal directory (or via your agent) and request quotes.
2. Book the site visit. The expert inspects the property in person — its construction, windows, insulation, and heating, cooling and hot-water systems.
3. The PQ enters the data into the SCE, calculates the class and drafts the certificate.
4. The certificate is registered and issued digitally with its unique code, typically two to three days after the visit.

Have your paperwork ready. The expert will usually want the caderneta predial urbana (the urban property tax record), the certidão do registo predial (land-registry certificate), and floor plans (plantas). For newer homes, a technical file covering materials, insulation and system manuals speeds things up. The land-registry certificate is easy to pull online — see our guide to the Certidão Permanente de Registo Predial.

The fines for getting it wrong

Skipping the certificate, or advertising a property without stating its energy class, is a formal offence (contraordenação) with real teeth:

• Individuals: fines from €250 to €3,740.
• Companies: fines from €2,500 to €44,890.

In practice, the most common trap for private landlords and sellers is the advertising rule: listing a flat for rent or sale without the class showing is enough to expose you to a penalty, even if you intend to commission the certificate later.

Which buildings are exempt

Not everything needs a certificate. The SCE's own list of exemptions includes industrial, livestock or non-residential agricultural installations; warehouses where people are present two hours a day or less; single-family homes of 50 m² or less; storage rooms and utility spaces; and workshops without heating or cooling for human comfort. Secondary sources also cite temporary buildings, places of worship and certain listed or heritage buildings, though the precise conditions for those sit in the law and are worth checking before you assume an exemption applies.

Why the rating is worth more than a box tick

Beyond the legal requirement, the class is your gateway to money-saving programmes and a signal about running costs. As home cooling and heating demand climbs across Portugal, an efficient home is a cheaper home to run — and the certificate's recommendations are a ready-made improvement list.

The certificate has also been the entry point for renovation grants. The Vale Eficiência scheme gave vulnerable households vouchers worth €1,300 each — up to three per home — toward window replacement, heat pumps, solar thermal systems and rooftop solar. That programme stopped issuing new vouchers in February 2026 as its funding deadline approached; the government then pledged to cover tens of thousands of families left out, and a successor, Famílias + Sustentáveis, is planned under the national Social Climate Plan for 2026 onwards. Anyone weighing efficiency works should track the successor scheme, especially given how much EU renovation money has flowed with uncertain results across the bloc.

What is changing next

The whole system rests on Decreto-Lei n.º 101-D/2020, which set up the current SCE and the residential and commercial performance regulations. The bigger shift is coming from Brussels: the recast EU Energy Performance of Buildings Directive (Directive 2024/1275) must be transposed into Portuguese law, with a deadline in May 2026. It brings a definition of "zero-emission buildings" — required for new public buildings from 2028 and other new buildings from 2030 — along with minimum performance standards, a National Building Renovation Plan, and a "renovation passport" that will work alongside the energy certificate. The lettered scale itself is expected to be reworked, with zero-emission buildings sitting at the top. In short, the certificate you get in 2026 is valid for a decade, but the rules around what a good rating means are about to tighten.

What this means for you

• If you are buying: Read the class before you fall in love with a place. A D or E flat is common and fine, but it flags higher energy bills and a longer improvement list — factor that into your offer. Fold the certificate into the wider transaction, which runs through the Casa Pronta one-stop counter.
• If you are selling: Commission the certificate first, before the listing goes live, and put the class in the advert. It is the cheapest way to avoid a fine and a stalled sale.
• If you are a landlord: The same advertising rule applies to rentals. Keep the certificate valid across the tenancy and remember it is a 10-year document, not a one-off.
• If you are renting: The class is a fair proxy for winter comfort and bills in a country where many older homes are cold and damp. Ask to see it, and weigh a poor rating against the rent.
• Everyone: Keep the PDF and its registration code with your property papers. You will be asked for it again — at sale, at re-letting, and when applying for efficiency grants.

The Certificado Energético is easy to dismiss as another piece of Portuguese bureaucracy, but it is one of the rare ones that pays you back: it is legally unavoidable, it unlocks grants, and it tells you, in a single letter, roughly what a home will cost to live in before you sign anything.