The Spanish property survey (peritación): why foreign buyers keep skipping it, and the €30,000 mistake it causes

Ask a British buyer what the first thing they do after an offer is accepted, and they'll say "book the survey." Ask a Dutch buyer and they'll say "the bouwkundige keuring — obviously." Ask a Spanish buyer and they'll look at you for a moment, then say "well, my cousin's a builder, we walked through it."

Foreign buyers in Spain almost always adopt the local habit. The estate agent tells them nobody does surveys, the lawyer confirms it, the seller is offended by the suggestion, and by the time the arras is signed the buyer has quietly convinced themselves that Spanish construction must simply be more reliable. Then, six months after completion, they discover that the terrace was built without a permit, the roof beams have carpenter-ant damage the paint was hiding, the "independent" boiler is shared with the neighbour, or the aluminosis nobody mentioned means the whole slab will need replacing in ten years.

None of this is common. All of it is expensive. And almost all of it is cheap to detect before you sign.

This is the 2026 guide to the Spanish property survey for foreign buyers: what a peritación técnica actually is, how it differs from the tasación bancaria you may already have paid for, when it is worth doing and when it isn't, how to hire the right person, and — crucially — how to write your arras contract so that the survey findings can save you money instead of costing you the deposit.

Three words that mean three completely different things

The first source of confusion, before we go any further:

Term	What it is	Who pays	What it's for
Tasación bancaria	An official valuation by a bank-approved appraiser	Buyer (via the mortgage)	Deciding how much the bank will lend against the property
Peritación técnica (or informe pericial)	A structural and legal condition survey by an architect or arquitecto técnico	Buyer	Deciding whether the buyer should proceed, and at what price
ITE / IEE (Inspección Técnica de Edificios / Informe de Evaluación del Edificio)	A mandatory ten-yearly building inspection for older blocks	The community of owners	Compliance with municipal safety rules

A tasación tells you what the property is worth. A peritación tells you what condition it is in. An ITE tells you whether the building is legally habitable. The three overlap on almost nothing.

Foreign buyers who paid €400 for a tasación often believe they have "had a survey done." They haven't. The tasación is a 30-minute visit by someone comparing three photos to the catastro record and a spreadsheet of comparables. It says nothing about whether the roof will hold, whether the wiring is legal, or whether the terrace is registered.

If you are borrowing from a Spanish bank you will get a tasación automatically. It is not a substitute for a peritación.

What a peritación technica actually covers

A proper peritación is done by an arquitecto técnico (formerly aparejador) or an arquitecto superior, registered with the local Colegio and carrying professional indemnity insurance. Expect them to spend two to four hours on-site with a thermal camera, a moisture meter, a plumb line, a mains tester and a torch, then a further one or two working days producing a report.

A serviceable peritación covers:

• Structure. Load-bearing walls, foundations (as far as observable), signs of settlement, cracks — hairline vs. structural, the direction the crack runs, whether it's live or historic.
• Roof and terraces. Waterproofing membrane, tile condition, insulation, drainage slopes, chimney flashings, terrace overloading.
• Damp. Rising damp from the forjado, penetrating damp from façades, condensation from cold bridges, the difference between the three — critical because the remediation for each is completely different and ranges from €800 to €40,000.
• Electrical installation. Whether the cuadro meets the 2002 REBT regulations (the threshold most foreign buyers miss), whether there is proper earthing, whether the diferencial trips correctly. In pre-2002 flats an entire rewire runs €5,000–€12,000.
• Plumbing. Lead pipes (still present in some pre-1980 buildings), pressure, hot-water flow rate, the material of the down-pipes on shared risers.
• Boiler and gas. Age of the caldera, date of the last revisión, presence of the mandatory certificado de gas.
• Legal-physical match. Whether the property on the ground matches the description on the nota simple and the catastro — a check the lawyer does on paper and the surveyor does with a tape measure. Discrepancies of more than 5% are common and can be very expensive to regularise. Our Catastro vs Registro discrepancy guide explains why.
• Unpermitted works. Terraces glazed in, garages converted to bedrooms, mezzanines added, pools with no licencia de obra. The surveyor cross-references the physical property against the nota simple, the ficha catastral and, where relevant, the licencia de primera ocupación.
• Common risks specific to the region. Aluminosis in Catalan blocks built 1950–1970. Seismic reinforcement in Murcia and Granada. Wind-driven rain damage on Atlantic and Cantabrian coasts. Salt corrosion on rebar in seafront properties.

What a peritación does not usually cover, unless you ask explicitly and pay extra: buried drainage runs, hidden pipework behind tiled walls, asbestos testing, radon (relevant in parts of Galicia and Extremadura), and a full electrical certification (that is a separate certificado de instalación eléctrica by an electrician).

Ask, in writing, what is included before you commission. A good surveyor will send a two-page scope document; a cheap one will send a WhatsApp.

When a peritación is worth paying for — and when it isn't

The honest answer, unlike in Britain: not always.

Definitely commission a survey when:

• The property is more than 50 years old, especially in Barcelona, Madrid, Valencia, Bilbao, Seville, or any casco antiguo. Old Spanish construction is often superb, but the failure modes (aluminosis, chestnut-beam rot, poorly reinforced bóveda catalana ceilings) are specific and dangerous.
• You are buying a rural or semi-rural detached property (chalet, casa de campo, finca, cortijo, masía). No community of owners means no shared maintenance history, and often no permits for half the outbuildings.
• The property has visible signs of movement, damp, or amateur repair — freshly painted single walls, unexplained skirting reveals, doors that don't close square.
• The listing mentions or hints at unregistered surface area — "110 m² útiles + 25 m² of glazed terrace not on the catastro". That extra 25 m² is either a legalisation cost or a demolition order waiting to happen. Read our AFO / DAFO guide if you're in Andalusia.
• You are buying sight unseen or through a power of attorney from abroad. The surveyor is your eyes on the ground and your evidence base if something turns up post-completion.
• You are buying a pre-2000 flat and the ITE is either overdue or has "desfavorable" findings. The community may be about to levy a special assessment on all owners for the repairs, and Spanish law makes that levy your problem if you complete before it's voted.
• The bank valuation came in materially below the asking price. That gap is sometimes the market — but sometimes the appraiser has spotted something the agent hasn't volunteered.

A survey may be overkill when:

• You are buying a new build off-plan directly from a developer with a valid Libro del Edificio and 10-year decennial insurance (seguro decenal) in place. Most of what a peritación would find is either covered by the warranty or physically inaccessible.
• You are buying a resale in a well-run, post-2010 building with an up-to-date ITE, a functioning administrador, and no visible warning signs, at a price below €200,000 where the survey fee is a material fraction of the deal.
• The property is being sold to be demolished — you're buying the land and the plot ratio, not the structure.

Even in those cases, a truncated peritación of only the roof, the cuadro eléctrico and the forjado is usually cheap insurance.

What it costs in 2026

Fees are not regulated and vary sharply by region and property type. Ballpark numbers our readers report in 2026:

Property type	Typical fee
Small city flat (60–90 m²)	€350–€550
Larger flat or duplex (100–150 m²)	€500–€800
Village house / terraced (150–250 m²)	€700–€1,200
Detached villa / chalet (250–400 m², garden, pool)	€1,000–€2,000
Rural finca (irregular plot, outbuildings)	€1,500–€3,500
Historic building or protected façade	€2,000–€5,000

Some arquitectos técnicos also charge a travel supplement of €0.30–€0.50 per km beyond a 20 km radius. Add IVA (21%). A survey with thermographic imaging, a moisture map and a nota simple cross-check is at the top of each band; a walk-through and a two-page report is at the bottom.

For context: on a €300,000 purchase, a €700 survey is 0.23% of the price. On a €150,000 village house it is 0.5%. In both cases it is much less than what you'd pay for the tasación bancaria plus the notary plus the gestoría. It is the cheapest professional opinion you will ever buy on the property.

How to find a good surveyor

Two rules that override everything else:

1. Not the one the agent suggests. The same conflict-of-interest problem as with the lawyer applies twice as strongly to the surveyor. Your surveyor will not spend two weeks upsetting a colleague's livelihood to save you €5,000.
2. Colegio-registered, with insurance. Ask for their número de colegiado and the name of their Colegio (each province has one). Ten seconds of Googling confirms it. Uninsured surveys are worthless — the whole point is to have a professional whose indemnity insurance you can claim against if their report missed something material.

Where to look:

• The Colegio Oficial de Arquitectos (COAM in Madrid, COAC in Catalunya, COACV in Valencia, etc.) and the Colegio de Aparejadores y Arquitectos Técnicos — every province has both — publish member directories. Cold-calling three from the list works.
• Your lawyer — the independent one you hired for the purchase, not the agent's — usually knows two or three good local surveyors. They have skin in the game; they don't want their clients discovering post-completion nasties either.
• Ex-pat forums for the region (Costa del Sol, Costa Blanca, Balearic, Mallorca) list surveyors who write reports in English. Expect a €150–€300 language premium.
• If you posted your criteria on Buvivo, some responding agents will have their own list of recommended independent surveyors — take it if the agent understands the point of the exercise, ignore it if the recommendation reads like a favour.

Get quotes from two. If the price is more than 20% apart on the same property, either the scope is different or one of them is guessing.

The arras clause that turns a survey into leverage

Here is where most foreign buyers give away all the value of the survey they just paid for.

The standard sequence is: sign the arras penitenciales, pay 10%, book the survey, receive the report a week later, discover a €22,000 roof issue — and then discover that the arras has no clause that lets you renegotiate or withdraw without losing the deposit. Which means the seller now knows two things: the roof needs €22,000 of work, and you cannot walk away without losing €30,000. Which side of that table would you rather be on?

The fix is a single sentence in the arras, drafted by your lawyer before you sign:

Este contrato queda sujeto a la realización de una peritación técnica del inmueble a cargo del comprador dentro de un plazo de X días naturales desde la firma. En caso de que el informe pericial identifique defectos estructurales, patologías constructivas, incumplimientos urbanísticos o discrepancias registrales cuya reparación o regularización exceda de €Y, el comprador podrá optar por (a) resolver el contrato con devolución íntegra de las arras, (b) renegociar el precio en la cuantía necesaria, o (c) exigir al vendedor la reparación previa a la escrituración.

Translated: the contract is conditional on a survey within X days. If the surveyor finds problems whose remediation exceeds €Y, the buyer can (a) walk away with the deposit back, (b) renegotiate the price down, or (c) require the seller to fix the issue before completion.

Typical values: X = 14 to 21 days, Y = €3,000 to €10,000 depending on the size of the deal. The seller may resist. Two responses:

• "If there's nothing to find, this clause costs you nothing." This tests whether the seller is confident in the property.
• "Every professional international buyer's lawyer includes this clause." This is true, and stating it removes the sense that you're trying to invent an escape hatch.

If the seller still refuses, that in itself is a signal worth heeding. Insist. If they walk away over a two-week condition precedent, they were not a serious seller.

Once the clause is in, the peritación becomes the leverage it should have been: the report finds €22,000 of work; you knock €18,000 off the price and the seller does €4,000 of the urgent repairs before completion. Both sides feel they extracted a win. This is how it's meant to work.

Reading the report: the phrases that mean walk away

A Spanish peritación uses a small, standard vocabulary. Learn to read it:

• "Sin patologías aparentes" — no visible defects. This is the good line. It does not mean "perfect"; it means the surveyor saw nothing worrying.
• "Se observa fisuración no estructural" — cracks, but not structural ones. Fine, monitor.
• "Fisuras de asentamiento activo" — active settlement cracks. Not fine. Ask for further investigation.
• "Humedad por capilaridad" — rising damp. Fixable but expensive; €2,000–€8,000 for injection or cámara bufa.
• "Humedad por filtración en fachada" — water penetration through the façade. Often a community-level fix, so budgetary risk depends on the comunidad accounts.
• "Aluminosis" or "cemento aluminoso" — a serious 1950–1970s concrete pathology. Read carefully; a positive finding can require full-slab replacement at five-figure cost per flat.
• "Instalación eléctrica anterior a 2002, no adaptada al REBT" — pre-2002 wiring, non-compliant. Budget €5,000–€12,000 for a full rewire.
• "Terraza / trastero / altillo sin licencia" — unpermitted works. Cross-check with the lawyer whether legalisation is possible; if not, you may inherit a demolition order.
• "Discrepancia catastro / registro superior al 5%" — the property on the ground differs materially from the paperwork. Fixable but slow and sometimes costly; do not close without a plan.
• "Estado general aceptable" — general condition acceptable. The most common closing line. Don't stop there — check what "acceptable" is being contrasted with.

A red report does not always mean walk away. It means renegotiate hard, insist on remediation before completion, and — if the seller resists — walk away with the deposit intact thanks to the arras clause above.

The ITE: the survey the building has to have anyway

While we're here: if the property is in a comunidad de propietarios and the building is more than 45–50 years old (thresholds vary by autonomous community), the ITE — Inspección Técnica de Edificios, also called IEE in some regions — is mandatory. It's renewed every 10 years, done by an arquitecto on behalf of the community, and filed with the town hall.

Before you sign, ask the administrador de fincas for:

1. The most recent ITE.
2. Its verdict: favorable, favorable con deficiencias, or desfavorable.
3. Whether the desfavorable findings have been budgeted, quoted, and voted.

An ITE desfavorable with an approved special levy of €14,000 per flat is a €14,000 line-item you inherit on completion day, whether or not you knew about it. The community actas will show whether a vote has taken place. This is one of the questions your lawyer should be asking before the arras is signed, not after. If it wasn't asked, ask now.

The three-page checklist before you commission

Once you have chosen your surveyor and the survey is booked, hand them a one-page brief before they visit. A good brief includes:

• Full property address, referencia catastral, and the nota simple (obtained by the lawyer).
• The floorplan the seller provided, if any.
• Photos of anything that already worried you on the viewing.
• The date of the last ITE if in a community, or a note that there isn't one.
• Any specific concerns — "is the terrace on the plans?", "is the pool licensed?", "why does the neighbour's wall have a bulge?".
• Confirmation that the arras has a survey-conditional clause, so the surveyor understands the report has teeth.

The surveyor who receives that email will price and prioritise the visit properly. The one who receives "can you go and take a look?" will send back a generic report that reads the same for every property.

The cases where skipping the survey is the €30,000 mistake

Every year, our inbox fills with the same handful of stories. In no particular order:

1. The terrace that wasn't on any plan. A £340k flat in Málaga with a glorious 30 m² glazed terrace, which turned out to have been enclosed by the seller in 2015 without a permit. Legalisation quote from the arquitecto: €18,000. Demolition order in year three because Costas revised the setback line: €14,000 and a smaller flat.
2. Aluminosis in Barcelona. A €480k Eixample flat with hairline ceiling cracks the buyer was told were "just plaster settlement." A €650 survey would have found the cemento aluminoso. The community special levy for structural intervention, voted 18 months post-completion: €62,000 per owner.
3. The village house with a shared boiler. A €90k casa in Segovia where the seller failed to mention that the caldera also heated the neighbour's house. Getting a separate one installed and a shared wall re-plumbed: €8,400.
4. The unregistered pool. A €520k villa in Alicante with a pool built in 2011 and never declared. IBI reassessment plus back-taxes: €3,900. Regularisation: €2,600. Neighbours contest it in local court because the setback shortened their view: another €7,000 in fees.
5. The Barcelona pre-2002 electrics. A pretty renovated flat where the reforma integral had reused the 1978 wiring behind the new plaster. First insurance claim after a fire: rejected, because the installation was non-compliant.

Not one of the sellers in these stories lied. All of them omitted. In Spain, caveat emptor still runs the property market: the buyer's remedy for undisclosed defects (vicios ocultos, Article 1484 of the Civil Code) is real but slow, adversarial, and — because the deposit was already paid — usually settles for pennies on the euro.

The survey is what closes that gap.

If you're still looking, not yet buying

The best time to think about the survey is before you find the property, not after you've signed the arras. Which means: build the surveyor into your team the same week you hire the lawyer, so that when the offer is accepted the survey books in within days rather than weeks.

If you're still searching, the way to make the survey work harder is to search for the right property in the first place. Post your criteria on Buvivo — region, budget, must-haves, condition tolerance — and only receive matches from agents and owners who have read the brief. The surveys on properly matched properties come back clean twice as often as those on properties buyers found in a Sunday-night portal binge. That's not luck; it's selection.

Related reading:

• The arras contract in Spain: the clause that decides who keeps the money
• Hiring a Spanish property lawyer: the conflict-of-interest trap
• 14 red flags every foreign buyer should spot before signing
• Catastro vs Registro discrepancy: the paperwork mismatch that stalls sales
• Comunidad de propietarios: the foreign buyer's guide
• Renovating a Spanish property: the reformas guide