Building Surveys and Snagging in Spain — Do You Need One?

If you have bought property before in the UK, Ireland or the USA, you probably assume a survey is a normal, almost automatic part of the process. In Spain it is not. Most Spanish buyers never commission one, nobody in the transaction will suggest it, and the purchase will happily complete without anyone ever checking whether the roof leaks. That catches expat buyers out — because the legal checks your lawyer runs and the valuation your bank orders tell you almost nothing about the physical condition of the building. This guide explains why surveys are the exception in Spain, why many expat buyers choose to have one anyway, what a survey covers, what snagging means on a new build, and how the condition of the property connects to your home insurance from day one.

Why building surveys are not standard practice in Spain

In Spain, property is generally sold as seen. The principle that the buyer takes responsibility for checking what they are buying runs deep in Spanish property culture, and the professionals involved in a typical purchase do not fill the gap. The estate agent is marketing the property for the seller. The notary who authorises the deed is an impartial public official — Spain's Consejo General del Notariado describes the notary's role as confirming identity and the legality of the deed, not inspecting the building. Even your own lawyer, whose due diligence is essential, is checking the legal position: ownership, debts, charges and licences. Nobody in the standard chain climbs on the roof or opens the electrical panel.

Spanish buyers themselves rarely commission surveys. Many are buying locally, know the building stock, or rely on family and friends in the trades to look a property over informally. There is no equivalent of the UK's ingrained "get a survey" habit, and agents can be visibly surprised when a foreign buyer asks for time to arrange one.

The result is a genuine blind spot for expat buyers. The purchase process will not stop, or even pause, for the condition of the building. If you want to know what you are actually buying — before you hand over a deposit that you may forfeit by withdrawing — you have to arrange that check yourself.

Survey vs valuation vs legal checks — three different jobs

Buyers often believe the condition of the property has been checked because something official has happened — a bank valuation, a lawyer's report, a notary appointment. It is worth being precise about what each one actually does, because none of them replaces a survey.

If you are buying with a Spanish mortgage, do not confuse the compulsory tasación with a survey. The valuer's job is to give the lender a defensible figure, usually after a short visit focused on size, location and comparable sales. Serious defects can and do pass unremarked. Our guide to mortgages in Spain explains the tasación in more detail. The survey is the only check on this list whose entire purpose is to tell you about the state of the building.

Do you actually need a survey in Spain?

There is no legal requirement to have one, and plenty of purchases complete without problems. Whether a survey is worth commissioning depends on the property and on how much risk you are comfortable absorbing. In practice, a survey earns its fee most clearly in these situations:

• Older properties. Much of Spain's housing stock dates from fast, high-volume construction booms. Buildings from the mid-20th century onwards vary enormously in quality, and original wiring, plumbing and waterproofing may be near the end of their life.
• Rural and village properties. Fincas, casas de pueblo and cortijos frequently combine old construction methods, decades of informal alterations, wells, septic tanks and outbuildings — exactly the mix where hidden problems accumulate.
• Heavily reformed homes. A gleaming renovation can conceal what was — or was not — done underneath. A surveyor looks past the paint at how the work was actually executed.
• Anything with visible warning signs. Cracks, staining, a musty smell, doors that stick, sloping floors or patched render all justify a professional opinion before you commit.
• Coastal and high-exposure locations. Salt air, driven rain and flat roofs are hard on buildings; terraces and roof decks are among the most common sources of water ingress.
• Any purchase where losing the deposit would hurt. Under the usual arras penitenciales deposit contract, a buyer who withdraws forfeits the deposit — commonly around 10% of the price. Discovering a serious defect after signing the arras puts you in an expensive corner. A survey beforehand keeps you out of it.

On a modern apartment in a well-maintained block, some buyers reasonably decide the risk is low and rely on a careful viewing plus their lawyer's checks on the community of owners. That is a legitimate judgement call — the point of this guide is that it should be a decision, not an oversight. For the wider picture of what can go wrong in a purchase, see our guide to the pitfalls of buying property in Spain.

Who carries out building surveys in Spain?

Spain does not use the word "surveyor" the way the UK does, and there is no single profession with that title. In practice, three kinds of professional carry out pre-purchase inspections:

• Arquitecto técnico (also known as an aparejador). This is the closest Spanish equivalent to a building surveyor: a university-qualified construction professional whose training centres on how buildings are actually put together, supervised on site and maintained. Arquitectos técnicos are registered with their provincial professional college, and pre-purchase condition reports are a normal part of their work.
• Arquitecto (architect). Fully qualified architects also produce condition reports, and are a natural choice where the questions are structural or where a reform project is planned after purchase.
• Chartered surveyors. In areas with large international communities, you will also find surveyors trained in the UK system — including RICS-qualified professionals — producing homebuyer-style reports in English. For buyers who want a familiar report format, this can be the most comfortable option.

Whoever you choose, the same independence rule applies as with your lawyer: instruct the surveyor yourself, and be wary of an inspector recommended by the selling agent or the developer. You want a report written for you, with no interest in whether the sale completes. Ask about qualifications and college registration, confirm they carry professional indemnity insurance, and check the report will be delivered in a language you fully understand — or budget for a translation of the key findings.

Types of survey available in Spain

Because surveying is not standardised around a national menu of products the way it is in the UK, the scope of a Spanish inspection is largely whatever you agree with the professional. Most offerings fall into four broad levels:

1. Walk-through or verbal opinion

An experienced professional accompanies you to a viewing, looks over the property and gives you an informal verbal assessment, sometimes with brief written notes. It is quick and inexpensive, useful for filtering candidates early in a search, but it is not a document you can rely on later — and nothing is checked in depth.

2. Standard condition report

The workhorse option, comparable to a UK homebuyer report. The surveyor makes a visual, non-invasive inspection of the accessible parts of the property — structure, roof coverings, façades, damp indicators, carpentry, and a functional look at the electrical and plumbing installations — and delivers a written report describing the condition of each element, the defects found and their apparent severity, and which items need further investigation.

3. Full building survey

A more detailed inspection for older, larger, rural or visibly problematic properties, or where you plan significant reform work. Expect more time on site, closer attention to structural elements and the causes (not just symptoms) of defects, and often an outline of likely repair priorities. Where something cannot be verified visually, a good report says so plainly and recommends the right specialist test.

4. Specialist investigations

Targeted follow-ups when the main survey — or your own eyes — raise a specific concern: structural movement assessments, damp diagnosis, timber inspections for termites and woodworm, electrical installation checks, swimming-pool and septic-tank inspections, or drainage cameras. On period buildings a structural specialist can also test concrete where high-alumina cement (cemento aluminoso) is suspected, a known weakness in some mid-20th-century construction.

Whatever the level, agree the scope in writing before the visit: exactly what will be inspected, whether the surveyor will access the roof and any crawl spaces, what equipment (such as a damp meter) will be used, the delivery time, and the language of the report.

What a surveyor actually checks

A competent pre-purchase inspection works systematically through the building. On a typical Spanish home the surveyor will look at:

• Structure and movement. Cracking patterns in walls and floors, distortion of openings, sloping floors, and signs of settlement or subsidence — with a judgement on whether movement looks historic and stable or active and worth investigating.
• Roofs and terraces. The condition of tiles or flat-roof membranes, drainage outlets, and the waterproofing of terraces and solariums — one of the most frequent sources of leaks in Spanish homes.
• Damp. Rising damp in older solid-wall construction, penetrating damp around façades and terraces, and condensation — three different problems with very different remedies, which is precisely why a diagnosis matters.
• Electrical installation. The age and apparent safety of the consumer unit and wiring, and whether the installation looks original to a period when standards were far less demanding than today's.
• Plumbing and drainage. Visible pipework and water heaters, water pressure, staining that suggests leaks, and — on rural properties — wells, deposits and septic systems.
• Windows, carpentry and finishes. The state of joinery, glazing, render and paint, and what the finishes might be concealing.
• Timber. Beams and carpentry for termite galleries, woodworm and rot, particularly in traditional construction.
• Exterior and plot. Boundary walls, retaining structures, pools and outbuildings — and whether what exists on the ground matches what the paperwork describes.

The report should grade what it finds, distinguish cosmetic wear from genuine defects, and tell you clearly which items are urgent, which are maintenance, and which need a specialist. Treat any report that reads like a list of disclaimers with caution — the value is in the judgement.

Typical problems surveys find in Spanish properties

Every building is different, but surveyors working with expat buyers in Spain see the same families of problems again and again:

• Water ingress from terraces and flat roofs. Failed or ageing waterproofing on terraces, solariums and flat roofs, often showing as staining on the ceiling below. Repairs range from simple re-sealing to full membrane replacement.
• Damp in older and ground-floor properties. Solid walls without damp-proofing, poor subfloor ventilation and hillside construction make damp one of the most common findings — and one of the most misdiagnosed. Dehumidifier-and-paint "fixes" by sellers are common; a surveyor looks for the cause.
• Cracking and movement. Much of it is harmless shrinkage or thermal cracking, but clay soils, slopes and altered structures do produce genuine movement cases. The survey's job is to tell the two apart.
• Tired installations. Original wiring and plumbing in properties from earlier building booms may be decades old. Rewiring and re-plumbing are routine but significant costs that belong in your negotiation, not in your post-completion surprises.
• Poor-quality reforms. Work done without licences, without professional supervision, or by whoever was cheapest — beautiful tiling over questionable plumbing is a classic. Heavily reformed properties deserve more scrutiny, not less.
• Timber problems. Termites and woodworm in beams and joinery, particularly in traditional village and rural houses.
• Unregistered or unlicensed additions. Extensions, extra floors, closed-in terraces, garages and pools that were never licensed or never registered — a physical finding with legal consequences, covered in the next section.
• Septic tanks, wells and rural infrastructure. Systems that do not meet current requirements, or that were improvised long ago and never touched since.

None of these findings necessarily kills a purchase. Most become either a price negotiation, a repair plan, or — occasionally — a reason to walk away before the deposit is at risk. All three outcomes are better than finding out afterwards.

Illegal works and paperwork mismatches — where the survey meets the legal checks

One of the most valuable things a survey does in Spain is physical-versus-paperwork comparison. Spain has two separate official records of a property: the Land Registry (Registro de la Propiedad), which records ownership and charges and can be consulted through the Colegio de Registradores, and the Catastro, the descriptive and tax-focused record accessible through the Sede Electrónica del Catastro. It is very common for the registered description, the catastral record and the physical reality to disagree — a house extended decades ago, a pool that appears in no record, a "three-bedroom" property that is legally a two-bedroom with an unlicensed addition.

The surveyor establishes what physically exists; your lawyer establishes what is legally declared and licensed. Put together, the two reports answer the question that matters: is everything I am paying for legal, and if not, can it be regularised? Some regions operate recognised procedures for regularising older rural buildings, but they take time and money, and not everything can be regularised. Unlicensed works can affect value, insurability, future planning permission and your ability to sell. This is exactly why we recommend running a survey alongside independent legal due diligence rather than instead of it — our guide to using a property lawyer in Spain covers the legal half of the exercise in detail.

Snagging a new build in Spain

On a brand-new property the question changes from "what has gone wrong over the years?" to "what did the builder not finish properly?" — and that is what snagging means: a systematic inspection of a newly built home to catalogue defects, unfinished items and poor workmanship so the developer can put them right. Typical snagging findings are unglamorous but numerous: badly hung doors, scratched glazing, cracked tiles, patchy paint, missing sealant, sticking windows, faulty sockets, slow drains, and terraces that pond water.

When to snag

The ideal moment is before completion. Ask — through your lawyer — for a pre-completion inspection, attend it with a snagging checklist or bring a professional (an arquitecto técnico or specialist snagging inspector), and have the defect list documented in writing with photographs. Developers are generally far more responsive while they are still waiting for your final payment than afterwards. If defects emerge after you move in, report them to the developer in writing and keep copies of everything.

Your legal backstop: the LOE defect liability periods

New builds in Spain sit on a statutory foundation that resale properties do not have. The Building Regulation Act, Ley 38/1999 de Ordenación de la Edificación (LOE), sets out three liability periods for building defects in its Article 17:

• 10 years for material damage caused by defects affecting structural elements — foundations, supports, beams, load-bearing walls and the like — that compromise the building's stability;
• 3 years for defects in elements that breach habitability requirements, such as watertightness and insulation;
• 1 year for defects in finishing elements, for which the builder answers.

To back the ten-year structural liability, the LOE (Article 19) requires a ten-year damage insurance policy — the seguro decenal — for new buildings whose principal use is housing, with a limited exception for individuals who self-build a single family home for their own use. Your lawyer should confirm the seguro decenal exists and obtain the details before completion; it matters if you ever need to claim for structural damage, and it matters again when you sell within the ten-year window.

Two practical cautions. First, the LOE periods are not a maintenance plan: the shorter windows pass quickly, which is why a thorough snag in the first months is so important. Second, the seguro decenal covers serious structural damage — it does not cover your contents, water damage from a burst pipe, liability to neighbours or any of the everyday risks a home policy exists for. Our guide to new build home insurance in Spain explains how the two fit together.

What does a building survey cost in Spain?

There is no national fee scale, so pricing is set by each professional and varies widely. Rather than quote figures that would be out of date or wrong for your area, it is more useful to understand what drives the cost:

• The size and type of property — a village house with outbuildings and land takes far longer to inspect than an apartment;
• The scope — a walk-through opinion, a standard condition report and a full survey are very different amounts of work;
• Location and travel — remote rural properties add time;
• Language and format — a full written report in English may cost more than a standard Spanish report;
• Specialist add-ons — timber, structural or damp investigations are usually priced separately.

Always ask for a written quotation setting out exactly what is included, and compare scope rather than headline price. Whatever the fee, keep it in proportion: measured against the purchase price, the taxes and costs of buying (see our guide to property purchase taxes and buying costs) and the cost of repairing even one significant hidden defect, a survey is one of the cheaper items in the whole transaction — and the only one whose entire job is protecting you from the building itself.

How and when to commission a survey

Timing is the part buyers most often get wrong. The survey protects you fully only if it happens before you are financially committed — which in a Spanish purchase means before you sign the arras deposit contract, or at the very least with the arras made expressly conditional on a satisfactory survey. Conditional clauses are not the Spanish default, but they are negotiable, and your lawyer can draft one. Signing an unconditional arras first and surveying afterwards leaves you choosing between completing on a defective property or forfeiting the deposit.

The practical sequence looks like this:

1. Find your surveyor early — ideally while you are still viewing, so you are not scrambling once you have an offer accepted.
2. Agree scope, fee, timescale and language in writing.
3. Arrange access through the agent or seller. A seller who resists a survey is telling you something.
4. Give the surveyor the paperwork — the nota simple and catastral details help them compare records with reality.
5. Read the report with your lawyer. Physical findings often have legal dimensions (unlicensed works, community responsibilities in apartment blocks) and negotiation consequences.
6. Act on it — renegotiate the price, ask the seller to remedy specific items before completion, budget the repairs, or walk away while you still can.

A bad survey result is not usually the end of a purchase. Sellers know that the next serious buyer may find the same problems, and a documented defect list is a strong, factual basis for a price discussion. Where the full process of a purchase is new to you, our complete guide to buying a house in Spain walks through every stage in order.

How a survey interacts with your home insurance

A survey and a home insurance policy protect you against different things, and understanding the boundary between them is genuinely useful when you buy:

• Insurance is for the sudden and unforeseen — not for pre-existing defects. Home policies are designed around events: fire, storm, theft, escape of water. They commonly exclude gradual deterioration, wear and tear, defective construction and problems that existed before the policy began. In other words, the defects a survey would have found are, broadly, the ones a policy is least likely to pay for. The survey is how you avoid buying an uninsured problem.
• Condition affects cover. When arranging insurance you are expected to answer the insurer's questions honestly — about the property's state, construction and use. A survey gives you accurate information to give the insurer, which protects the validity of your cover.
• A survey helps you insure for the right amount. Buildings cover should reflect the cost of rebuilding, not the purchase price. A detailed report describing the construction, size and quality of the property is a solid basis for setting realistic sums insured and avoiding underinsurance.
• Extraordinary risks have their own safety net. In Spain, damage from certain extraordinary events — such as severe flooding — is compensated by the state-backed Consorcio de Compensación de Seguros, but only where the property has an insurance policy in force. It is one more reason to have cover active from day one.
• New builds still need a policy. The seguro decenal answers for major structural damage in the first ten years, but everything else — contents, water damage, glass, liability — is the job of an ordinary home policy from the day you get the keys.

The practical move is simple: line up your buildings and contents cover so it starts on completion day, with no gap between getting the keys and being covered. Our guide to home insurance when buying property in Spain explains what to arrange and when.

Your quick checklist

• Remember: nobody else checks the building — not the agent, the notary, the bank's valuer or your lawyer.
• Decide on a survey before the arras contract, and make the arras conditional if the survey comes later.
• Choose an independent professional — an arquitecto técnico, architect or chartered surveyor you instruct yourself.
• Agree scope, fee, timescale and report language in writing.
• Ask the surveyor to compare the physical property against the registry and catastral records.
• On a new build, snag before completion and confirm the seguro decenal through your lawyer.
• Use the report to negotiate, plan repairs or walk away — all three beat finding out later.
• Arrange home insurance to start on completion day, informed by what the survey found.

Frequently asked questions