The Step Most Expat Buyers Skip (And Live to Regret): Why a Building Survey in Costa Blanca is Non-Negotiable
- HomeSurveyQuote.com
- Mar 25
- 9 min read
It's a warm Tuesday afternoon in October. You've just had a second viewing on a three-bedroom villa outside Moraira - terracotta tiles, mountain views, mature orange trees in the garden, a pool that glitters like something from a property brochure. The agent tells you there's another offer coming in by Friday.
You like it. Your partner loves it. You've already mentally placed your furniture.
So, you ask: "Do we really need to pay for a survey? It looks fine. The previous owners clearly looked after it."
This is the most common - and most expensive - question in Costa Blanca property buying.
The answer is yes. Always yes. And this post is going to tell you exactly why.
Why Most Expat Buyers Skip the Survey (And Why That Logic Falls Apart)
There are a handful of reasons buyers talk themselves out of a survey, and they're all understandable. None of them hold up.
"It looks well-maintained." Cosmetic presentation tells you almost nothing about structural integrity. A fresh coat of paint, new kitchen tiles, and a recently re-rendered exterior are cheap. They are also effective at concealing damp, cracked render, failing waterproofing, and moisture ingress. The properties that look the best are sometimes the ones that have had the most work done to hide problems rather than fix them.
"The bank is doing a valuation anyway." A mortgage valuation (tasación) assesses the property's market value for lending purposes. It is carried out by a bank-appointed valuer who spends, on average, 20–30 minutes at the property. They are not looking for roof failures, rising damp, or illegal wiring. That is not their job. You need a separate, independent building survey. They are entirely different things.
"Spanish law must protect buyers." It does not - not in the way UK buyers expect. Spain operates on the principle of caveat emptor: buyer beware. Sellers in Spain have no legal obligation to proactively disclose defects. Once you complete and the keys are handed over, what's yours is yours - including the problems.
"It costs money." A building survey in Costa Blanca typically costs between €350 and €800. A roof replacement costs €8,000–€25,000. A structural repair can cost significantly more. The survey is not an expense. It is insurance.
What Can Actually Go Wrong: Real Issues Found in Costa Blanca Properties
The Costa Blanca is not the UK. The climate, the construction methods, the age of the housing stock, and the regulatory history all create a specific set of risks that buyers from northern Europe simply aren't used to looking for.
Here's what surveyors regularly find:
Hidden Damp and Moisture Ingress
This is the single most common finding in Costa Blanca resale properties. The combination of intense summer heat, winter rain, and construction methods that often prioritised aesthetics over waterproofing creates ideal conditions for moisture to get in - and stay hidden.
Damp in Spanish properties often presents differently to damp in northern European homes. There may be no visible staining, no peeling wallpaper, no obvious tide marks. The moisture is behind render, under tiles, inside walls. It only reveals itself through thermal imaging - or, eventually, through the damage it causes.
Left undetected, persistent moisture leads to structural deterioration, mould growth, damage to roof timbers and joists, and costly remedial work.
Roof Failures
Flat roofs are extremely common across Costa Blanca properties - particularly in 1970s–1990s-era builds - and flat roof waterproofing has a limited lifespan. Many properties have roofs that are well beyond their service life, with failed membranes, cracked screed, and compromised flashings.
The problem: a failing flat roof in Spain often shows no visible interior signs until significant water has already entered the structure. By the time you see a stain on the ceiling, the damage is already done.
A surveyor will inspect the roof surface, drainage, upstands, and flashings, and give you a realistic assessment of remaining lifespan and likely replacement costs.
Structural Issues and Settlement
Older villas in the Costa Blanca - particularly those built on hillsides or with terraced gardens - can have issues with ground movement, inadequate foundations, or retaining walls that are failing under load. These are not always visible from a casual inspection, but the signs are there for a trained eye: diagonal cracking at window and door openings, stepped cracking in blockwork, doors and windows that no longer close properly.
A structural assessment will identify active movement versus historic cracking - a distinction that matters enormously for remediation costs.
Illegal Extensions and Unlicensed Structures
This is a Costa Blanca-specific risk that buyers from the UK and northern Europe frequently underestimate. Extensions, outbuildings, pool houses, barbecue areas, extra bedrooms - an enormous number of these were built without planning permission, particularly in rural areas and in the building boom of the 1990s and 2000s.
An unlicensed structure can be ordered for demolition. It may not be insurable. It may create problems when you come to sell. And crucially, the seller may not always know (or volunteer) that the paperwork doesn't match the property.
A good building survey will flag any structures that appear to fall outside the scope of the original planning licences, allowing your lawyer to verify the legal position before you complete.
Electrical and Plumbing Installations
Spanish electrical regulations have changed significantly over the decades, and older properties may have wiring that is outdated, undersized, or non-compliant. Aluminium wiring (common in 1970s builds), inadequate earthing, overloaded distribution boards, and substandard amateur additions are all found regularly.
Plumbing issues are equally common: corroded pipework, failing water heaters, inadequate pressure, and DIY modifications that don't comply with current standards.
Neither of these is visible without inspection. Both can be costly to rectify and, in the case of electrics, represent a genuine safety risk.
Pool and Outbuilding Condition
Many Costa Blanca properties include a pool, storage buildings, garden walls, and terracing. These are rarely inspected by buyers who are focused on the main villa, and they can be expensive. Pool structural issues - cracking, delamination, failing waterproofing - are not uncommon. Retaining walls that look solid can be moving. Outbuildings can have asbestos-containing materials in older roof sheets.
A comprehensive survey covers all of these, not just the main dwelling.
What a Professional Building Survey Actually Covers
A thorough building survey in Costa Blanca by a qualified, RICS-accredited surveyor will inspect and report on:
Structural assessment Foundations, load-bearing walls, lintels, columns, beams, roof structure. Identification of cracking, movement, and settlement - with an assessment of severity and recommended action.
Roof inspection Roof coverings (tile, flat roof membrane, terrace waterproofing), drainage, flashings, parapets, gutters and downpipes, roof timbers and joists where accessible.
Damp and moisture Full assessment using moisture meters and, where included, thermal imaging cameras to identify hidden damp, interstitial condensation, and active leaks not visible to the naked eye.
Electrical installations Visual inspection of the distribution board, wiring condition, earthing, socket types, and compliance with current standards. Note: a full electrical certificate (boletín eléctrico) requires a separate registered electrician, but a surveyor will flag significant concerns.
Plumbing and water systems Condition of visible pipework, water heater, pressure, drainage, and any obvious defects.
External areas Pool condition, outbuildings, retaining walls, boundary walls, terracing, steps, external drainage, external render condition.
Windows and doors Condition, operation, draught-sealing, and any evidence of water ingress at frames.
Envelope and thermal performance Identification of cold bridges, poor insulation, and areas of heat loss - relevant both for comfort and for understanding future energy costs.
Remedial cost schedule A good survey doesn't just identify problems - it gives you a realistic estimate of what each issue will cost to fix. This is one of the most practically useful parts of the report.
How Thermal Imaging Changes Everything
Standard visual surveys miss what's behind surfaces. Thermal imaging - using an infrared camera to detect temperature differentials - reveals what the naked eye cannot.
In practical terms, this means:
Hidden damp shows as cold spots within walls, floors, and ceilings, even when the surface appears dry
Electrical hotspots - overloaded circuits or failing connections - generate heat signatures detectable before they become fires
Missing or failed insulation creates temperature patterns that identify exactly where energy is being lost
Active roof leaks produce distinctive thermal signatures even when no visible staining has yet appeared
For a region like the Costa Blanca where moisture ingress is the leading cause of structural deterioration, thermal imaging is not a luxury add-on. It is the difference between finding a problem before you buy and finding it six months after.
When Should You Commission the Survey?
The ideal time is after your offer is accepted but before you sign the contrato de arras (the private purchase contract where you commit 10% of the purchase price).
This gives you:
Full information before any significant financial commitment
Negotiating leverage — if the survey finds issues, you can renegotiate the price or request that works are carried out before completion
The option to walk away — before the arras is signed, you can withdraw without penalty
Some buyers commission a survey after signing the arras, using the findings to negotiate price adjustments. This is possible, but you are now negotiating from a weaker position - you've already committed 10% and the clock is running.
A small number of buyers wait until after completion and then discover what a survey would have found. This is not a strategy. This is a very expensive lesson.
Can't I Just Get a Local Builder to Take a Look?
You can. Many expat buyers do exactly this - ask a builder they've met through an online expat forum to walk around the property and give an informal opinion.
The problem is that a builder is looking at the property through the lens of work they can carry out. They may identify things that fall within their trade, but they're not trained in structural assessment, they're not looking for moisture with meters, they're not assessing the roof membrane or the condition of the electrical installation. And critically - they have no professional indemnity insurance. If they miss something significant and you suffer a loss as a result, you have no recourse.
A RICS-accredited building surveyor carries professional indemnity insurance, is bound by a code of professional conduct, and produces a written report that forms part of your due diligence paper trail.
These are not equivalent.
How to Use the Survey Report
Your survey report is a working document, not something to read once and file. Here's how to use it properly:
Prioritise findings by severity. A good report will categorise issues by urgency — immediate action required, monitor and maintain, or noted for information. Focus your attention (and negotiation) on the high-priority items.
Get quotes for remedial works. Use the surveyor's cost estimates as a starting point, then get two or three quotes from local contractors. This gives you hard numbers for negotiation.
Go back to the seller. Armed with a professional report and remedial cost estimates, you can legitimately request either a price reduction or that works are completed before completion. Sellers of properties with issues often expect this conversation.
Share with your lawyer. Any issues with unlicensed structures, planning compliance questions, or concerns about the property's legal description should be flagged with your lawyer immediately.
Make an informed decision. Sometimes a survey reveals issues that are manageable and already reflected in the price. Sometimes it reveals issues that fundamentally change the economics of the purchase. Either way, you are making a decision based on facts - not crossed fingers.
What Does a Building Survey Cost in Costa Blanca?
Survey fees vary depending on the size and complexity of the property. As a general guide:
Property Type | Approximate Survey Cost |
Apartment (up to 100m²) | €350–€450 |
Townhouse / semi-detached (100–200m²) | €450–€550 |
Detached villa (200–400m²) | €550–€700 |
Large villa with pool, outbuildings (400m²+) | €700–€850+ |
These are fixed-fee quotes with no hidden extras. The report is delivered in English within 5–7 working days of the inspection.
At Home Survey Quote, we connect buyers across the Costa Blanca with experienced, UK-qualified, RICS and CIOB-accredited building surveyors - English-speaking, locally based, and covering the entire stretch from Dénia and Jávea in the north to Alicante and Villajoyosa in the south.
One Final Thought
The buyers who skip the survey are not careless people. They're excited people. They've found a property they love; they're worried about losing it, and they're looking for reasons to say yes and move forward.
We understand that entirely.
But a building survey doesn't slow the process down - it takes a few days to arrange and a few hours to complete. What it gives you is something that no amount of viewing trips, agent reassurances, or gut feelings can provide: an independent, professional, written assessment of exactly what you're buying.
That is worth far more than the cost.
This article is for informational purposes only and does not constitute legal or financial advice. Always instruct a qualified Spanish lawyer for advice specific to your transaction.
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