Most overseas buyers arrive in Spain already knowing roughly what an energy certificate is, because their own country has some version of one. That familiarity can be a problem.
Spain's certificado de eficiencia energética looks like the document you know and behaves differently in ways that cost money. It only counts once it's registered with the regional government. A G rating expires in half the normal time.
A técnico competente, usually an architect or a building engineer, visits the property, measures it, and rates it from A to G on two scales: primary energy consumption and CO2 emissions. Behind the letter sits a number, kWh per square metre per year. That number is more useful than the letter, and it comes up again below.
The technician then lodges the certificate with the energy department of the autonomous community. That's the step people skip, and it's the one that counts. A certificate that hasn't been registered regionally has no legal effect, whatever the technician charged for it.
The certificate has been compulsory since 2013. The current rules sit in Royal Decree 390/2021, in force since June that year.
You need one to:
You'll also be asked for one when applying for a mortgage valuation, for energy-efficiency grants, and for a tourist rental licence in several regions, including the Comunidad Valenciana, where it forms part of the Declaración Responsable.
The advertising obligation is worth pausing on. Under the current law, anyone who publishes or allows the publication of a sale or rental listing has to include the energy rating. That binds the seller, the agent and the portal, not just the owner.
In practice you'll see plenty of Spanish listings marked "certificado en trámite", meaning the certificate is being arranged. Strictly the regulations make no allowance for that, but enforcement on listings is close to non-existent and the practice is completely normal. Don't take that as a warning sign, but do take it as a reason to ask for the certificate before you make an offer rather than after, because the rating is information you want while you still have room to negotiate.
Not everything needs one:
The last one has a catch. The exemption has to be declared in the deed, so it's a conversation with your lawyer rather than something you decide informally.
Ten years, with one exception. A G rating is valid for five.
That five-year rule isn't new, whatever you read elsewhere. It's been in the regulations since June 2021, though a number of Spanish certificate providers are currently marketing it as a 2026 change.
If you're buying and the seller produces a certificate dated 2014, it's expired. A new one is needed before completion.
The seller pays. Expect €70 to €150 for a normal home, depending on size, region, and how much the technician has to survey on site. Regional registration fees are extra and vary.
It's a small cost in the context of a Spanish purchase, which matters for what comes next.
The seller has to hand the certificate to the buyer, and the notary records that it happened.
Buyers can legally waive that. Spanish law treats it as a right the buyer can renounce, and buyers are sometimes asked to do exactly that, usually because the seller left it too late and doesn't want to delay the signing.
Don't agree to it. The certificate costs about a hundred euros and a few days. The waiver saves the seller that inconvenience and costs you the document, the rating, and the evidence of what you were told about the property's efficiency. If it comes up at the table, it's a question for your lawyer, not a formality to nod through.
Most Spanish housing stock built before 2007 rates E, F or G. A poor letter on a village house or a 1980s coastal apartment is normal, it isn't on its own a reason to walk away, and anyone telling you otherwise is selling insulation.
Where the certificate earns its keep is comparison. Two similar apartments in the same town, one rated D and one rated G, will differ in running costs, and the kWh per square metre figure tells you roughly by how much. Use it when you're weighing up properties on a viewing trip, and use it when you're pricing up what a place will need spending on it.
Most buyers don't know this, and it's the best reason to care about the letter.
Santander, ING, Unicaja, Bankinter, Cajamar and BBVA all offer green mortgages on energy-efficient homes. The qualifying threshold is the same everywhere: class A or B.
Be realistic about the size of it. Most discounts are around 0.10 percentage points, worth roughly €1,250 per €100,000 borrowed over twenty years, and Spain's consumer association OCU makes the fair point that green mortgages don't generally beat the best standard rates on the market. It's a benefit worth having rather than a reason to choose a property.
The threshold matters more than the discount. Because the cut-off sits at B, the B to C boundary is a cliff edge, and two properties both advertised as C can look identical while sitting in very different places within that band.
So the question worth asking isn't what letter a property has. It's how far off the next band it is. The kWh per square metre figure answers that, which is why the certificate is worth reading rather than glancing at.
If a property is a few points short of B, a targeted improvement can move it across. If it sits in the middle of the band, the same money buys you a warmer house and nothing else. Worth knowing which you're looking at before budgeting for works.
The things that move a rating are the obvious ones: heating and hot water systems, insulation, glazing, renewables. How far any of them takes you depends entirely on where you start, and gains at the top of the scale are harder won than gains at the bottom. So get the certificate, read the number, and work out how close you are to the next band before committing to anything.
The EU rules are being rewritten. The recast Energy Performance of Buildings Directive had a transposition deadline of 29 May 2026. Every member state missed it, and on 15 July 2026 the European Commission opened infringement proceedings against all 27. Once Spain transposes it, the A to G scale is harmonised across the EU, with G redefined as the worst-performing 15% of national housing stock. Ratings will move without anyone touching a building.
Spain has already reformed who can issue certificates. Royal Decree 659/2025 came into force on 23 July 2026. It opens certification to technicians with vocational qualifications alongside university-qualified professionals, and sets up a central national register of competent technicians with annual regional checks. The practical effect should be more capacity and fewer worthless certificates.
Can I sell without one? No. The seller has to produce it and the notary records whether it was delivered.
My certificate is from 2014. Is it still valid? No. Ten years is the maximum, five if the rating is G.
Does a bad rating stop me letting my Spanish property? Not today. Spain has no equivalent of French rental bans on bad ratings, so it's worth watching rather than worrying about.
Who arranges it, me or the agent? Legally it's the seller's obligation. In practice most agents will organise it, but the responsibility and the cost sit with the owner.
Does it transfer to me when I buy? Yes. The certificate belongs to the property and runs until it expires, so you inherit whatever is left of its ten years.
Is it the same as the certificate I'm used to at home? Similar idea, different rules. Several countries now restrict letting on the worst ratings, which Spain doesn't, so landlords sometimes arrive expecting Spanish limits that aren't there yet.
The listing says the certificate is being arranged. Should I worry? No, it's common. Ask for it before you make an offer rather than after.
Will a better rating get me a cheaper mortgage? Only from class B upwards, and the discount is modest, around 0.10 percentage points at most Spanish lenders. Worth asking about if the property qualifies, not worth chasing if it doesn't.
Written by
Nick StoreyNick Storey is the Operations Director at tumaklata.sbs, where he leads platform operations, product delivery, and commercial strategy.
Having lived and worked in Spain for 14 years, Nick began his career as an estate agent on the south coast of Granada and brings first-hand market experience to his work.
He joined Kyero in 2007 and has since played a central role in scaling the business, shaping its product direction, and strengthening how international buyers connect with agents across Spain, Portugal, France, and Italy
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