# Marbella Pre-Purchase Technical Survey: What an Arquitecto Técnico Actually Checks 2026

A UK private equity principal commissioned a Marbella pre-purchase survey on a €6.5M Sierra Blanca villa in March 2025. He expected a 60-page report in RICS Building Survey format with explicit traffic-light defect ratings and detailed photographic documentation. He received a 16-page report from a senior arquitecto técnico that ran a different format — concise findings organised by building area, key issues highlighted, judgment-based recommendations, fewer photographs and less defensive caveating. His initial reaction was that the survey was thin. After a 45-minute call with the surveyor, who walked through the findings room by room with the property history and context, his view shifted: the Spanish report was differently structured but covered the operationally meaningful issues clearly. He used the survey's three documented findings to negotiate a €185,000 price reduction; the survey cost €1,950.

This article walks through what a Marbella pre-purchase technical survey actually covers, how it differs from a UK chartered surveyor's RICS report, what it costs, when to commission it in the transaction sequence, and what findings should kill deals versus negotiate price reductions.

## The arquitecto técnico profession in Spain

The Spanish pre-purchase technical survey is conducted by an arquitecto técnico (technical architect), a regulated profession under Real Decreto 1837/2008 with provincial Colegios across Spain. The Colegio Oficial de Aparejadores y Arquitectos Técnicos de Málaga regulates the profession in the Marbella area.

The arquitecto técnico's training is a 3-4 year degree in Building Engineering or Technical Architecture (Ingeniería de Edificación or Arquitectura Técnica) plus practical experience and continuing professional development requirements. Mandatory professional indemnity insurance is in place under Colegio rules.

The profession is distinct from the arquitecto (architect), who handles design, planning, and overall project direction. The arquitecto técnico focuses on construction execution, building condition assessment, and installations. For property buyer purposes the arquitecto técnico is the right professional for pre-purchase surveys; the arquitecto would be engaged later for major renovation design or for new-build design.

The arquitecto técnico is also distinct from the tasador homologado (officially homologated valuer) who produces formal property valuations (tasaciones) approved by the Bank of Spain for mortgage purposes. The tasador's valuation is a different document with different regulatory standing; for a non-financed cash purchase a buyer may not need a tasación at all, but always needs the technical survey.

For the broader Spanish pre-purchase survey framework see also [pre-purchase building survey article](/article-marbella-pre-purchase-building-survey-en); this article focuses on the operational practice of commissioning and interpreting the survey.

## Cost structure: tier-based pricing

Survey cost scales with property size, complexity, and the depth required.

**Tier one (€800-€1,400).** Apartments up to 200 sqm, townhouses up to 250 sqm, straightforward villas up to 250 sqm. Basic technical survey covering visible structural condition, principal installations (electrical, plumbing, HVAC), envelope and roof, regulatory documentation review. The on-site time is typically 2-4 hours and the report is 8-16 pages. Common for the €1-2.5M Marbella property segment.

**Tier two (€1,400-€2,200).** Villas 200-500 sqm with pool, garden, multiple installations. More comprehensive survey including pool plant inspection, garden infrastructure review, additional installation systems, more detailed envelope inspection, often two visits or extended single visit. On-site time 3-6 hours; report 15-25 pages. Common for the €2-5M Marbella property segment.

**Tier three (€2,200-€3,000+).** Villas 500-1,500+ sqm with complex installations, full pool plant, generator, smart-home systems, security infrastructure, possibly multi-level basement, substantial outbuildings, helipad-compatible structures, indoor pools. Full comprehensive survey, often two arquitectos técnicos on site over 4-8 hours, sometimes split across two visits. Report 25-50 pages. Common for the €5M+ Marbella property segment.

**Specialised engineering supplements.** For very large or very specialised villas (above €15M, with complex security infrastructure, helipad-compatible structures, marine-adjacent properties), specialised consulting engineers may supplement the core arquitecto técnico survey. Examples: structural engineer for unusual structural systems, M&E engineer for complex installations, geotechnical engineer for hillside or coastal sites with stability concerns. Supplement cost ranges €3,000-€15,000 depending on scope.

**Comparison with UK RICS surveys.** UK chartered surveyor RICS Building Survey on a comparable property runs €1,800-€4,500 depending on size and specification. The Spanish technical survey is generally cheaper but also narrower in some respects (less detailed defect taxonomy, less defensive caveating). For Marbella properties above €5M, many international buyers commission both: the Spanish arquitecto técnico survey for the regulatory and structural baseline, and a UK RICS-style survey from a bilingual surveyor experienced in Spain for the more granular defect documentation. Combined cost €4,000-€8,000; the duplication produces meaningfully different findings often.

## What the survey actually inspects

Standard scope of a Marbella pre-purchase technical survey covers four areas.

**Area one: structural.** Visible structural condition is the foundation of the survey. The arquitecto técnico observes: foundation evidence at accessible points (no excavation), principal load-bearing elements (visible beams, columns, walls), beam-and-column condition where exposed, evidence of settlement (visible cracks at predictable settlement locations, evidence of differential movement, floor levelness), retaining wall condition for hillside properties (a frequent significant finding in Marbella villas on slopes), basement condition if applicable.

Note that the structural inspection is visual, not invasive. No opening up of walls, no concrete coring, no laboratory analysis of materials, no excavation. Buyers who want invasive structural verification need to negotiate access with the seller (rare and difficult) or commission additional specialised engineering work (potentially destructive, requiring seller agreement and reinstatement).

**Area two: installations.** Electrical: distribution board condition and labelling, evidence of certification (boletín eléctrico), visible cable condition where accessible, RCD and breaker functionality, contracted power adequacy versus actual usage profile, evidence of prior DIY modification. Plumbing: visible pipe condition where accessible, evidence of leaks (water staining, damp patches), water pressure assessment, hot water adequacy (storage tank or on-demand system condition). HVAC: boiler condition and last service date, air conditioning units condition and service history, ductwork visible portions, ventilation adequacy. Pool plant if applicable: pump condition, filtration system condition, chlorination or saline system condition, heating system if applicable, evidence of leakage at pool surface or returns.

**Area three: envelope and exterior.** Roof visible condition typically from ground or accessible balcony — full roof access is sometimes excluded depending on safety; a buyer should confirm with the surveyor whether roof access is included. Exterior walls: cladding condition, render integrity, evidence of damp through the envelope, drainage adequacy of overflow and storm water systems. Windows and doors: frame condition, glazing integrity (double or triple glazing condition, evidence of seal failure), opening mechanism functionality, security fitment quality. Terraces and balconies: tile condition, waterproofing membrane condition, drainage slope adequacy, structural support condition. Boundary walls and fences: condition, evidence of movement, boundary integrity.

**Area four: regulatory and documentation.** Cross-reference of cedula de habitabilidad or equivalent first-occupation licence, the energy certificate, the IEE/ITE if applicable for older buildings, evidence of unauthorised modifications relative to original licensed construction (extensions, enclosed terraces, basement conversions, pool houses, casitas), basic urbanism status check (the more detailed urbanism analysis is part of the lawyer's due diligence stack — see [due diligence stack article](/article-marbella-property-due-diligence-stack-en)).

For documentation specifics see [cédula de habitabilidad article](/article-marbella-cedula-de-habitabilidad-en).

## What the survey typically does NOT inspect

Setting realistic expectations matters. Standard Marbella technical surveys typically do not include:

Detailed market valuation (separate tasación by tasador homologado; required for mortgage purposes, optional for cash purchases)
Detailed defect rating taxonomy in RICS Building Survey format (Spanish reports are more concise and judgment-based)
Asbestos survey (separate specialised inspection; rarely applicable for modern Marbella villas but may apply for pre-1970s construction)
Radon survey (rarely relevant in coastal Marbella; potentially relevant for some inland or mountain properties)
Drainage survey with camera inspection (separate specialised service if needed; not standard for residential)
Tree survey (separate specialised arborist service if applicable to mature gardens)
Detailed environmental contamination assessment (separate specialised service; rarely relevant for residential)
Detailed pool engineering survey (the standard survey covers visible pool plant; structural pool engineering for an aging pool may need separate engineering)
Cultural heritage and listing assessment (relevant for very small subset of historic properties; not standard)
Underground tank or buried service inspection (visible only; ground-penetrating radar is separate specialised service)

A buyer who suspects a specific concern outside the standard scope should commission the specialised supplement explicitly. The arquitecto técnico will typically advise during the initial consultation if specialised supplements are warranted given the property profile.

## Commissioning timing in the transaction sequence

The survey should fire after offer acceptance and during the 14-21 day due diligence window between contrato de reserva (reservation contract) and arras (10% binding deposit) signing.

**Why not earlier.** Earlier-stage survey (commissioned before offer or before reservation contract) is operationally inefficient. The seller is unlikely to grant access for a thorough 4-8 hour survey without commitment; the buyer is paying for survey work on a property that may not become the buyer's transaction; and the survey findings cannot translate to negotiation power if the buyer has not yet engaged with the seller.

**Why not later.** Later-stage survey (between arras and escritura) is too late. The 10% binding deposit has already moved (typically €200K-€800K on Marbella transactions). The survey findings can translate only to seller-financed remediation, buyer absorption, or specific-performance dispute — not to clean withdrawal with capital intact. The buyer's negotiation position is weak because withdrawal carries the deposit forfeit risk.

**The right window.** The 14-21 day period between reservation contract signing and arras signing is the structural moment. The reservation contract should include a resolutive condition covering the survey: if the survey surfaces material adverse findings above an agreed threshold, the buyer can withdraw with reservation deposit return. The buyer's lawyer drafts this condition (see [hiring Spanish lawyer article](/article-marbella-property-hiring-spanish-lawyer-en)).

**Operational timing within the window.** Commission the survey within 48 hours of reservation contract signing. Survey site visit typically within 3-7 business days. Report delivery typically 5-10 business days after site visit. Total elapsed time 10-15 business days, fitting comfortably within the 14-21 day window when commissioned promptly.

## Findings that should kill deals vs negotiate

The survey produces findings that should be triaged by impact and remediation cost.

**Deal-killing findings (typical walkaway zone).**

Confirmed major structural movement: significant settlement with active monitoring required, displaced load-bearing elements, retaining wall failure with imminent collapse risk on hillside properties. Remediation cost typically €50K-€500K+ with uncertain success.

Confirmed unauthorised construction that cannot be regularised: major extensions without licence in zones where regularisation is precluded by current urbanism plan, structures violating boundary regulations or coastal protection lines (Ley de Costas). May face demolition order; cannot be cleanly transferred at marketable title.

Confirmed serious electrical safety issues indicating systemic problem: whole-house rewire needed (€25K-€80K), contracted power fundamentally inadequate for property use, multiple safety violations indicating prior DIY work suggestive of broader hidden issues.

Systemic water ingress affecting multiple rooms requiring envelope rebuild: roof replacement plus envelope waterproofing (€40K-€200K+), with operational disruption of 3-9 months and ongoing risk of recurrence.

Pool structural failure requiring complete reconstruction: pool that has structural failure of the basin (€40K-€150K reconstruction depending on size and finish), plus garden disruption.

Aggregate condition profile indicating systemic deferred maintenance: when multiple major issues are present simultaneously, the cumulative remediation cost often exceeds 15-25% of purchase price plus opens uncertainty about hidden issues. Better to walk than to navigate.

**Negotiate-down findings (typical price reduction zone).**

Localised structural cracks that need remediation: typically €2K-€15K cost; price reduction reflecting the cost plus a modest risk premium.

Aged electrical installation that should be upgraded but is currently functional: €8K-€25K typical full upgrade cost; price reduction reflecting half to full cost.

Aged plumbing with isolated leaks: €2K-€10K isolated repairs; price reduction reflecting cost.

Roof in declining condition with 3-7 year remaining life: €10K-€40K eventual replacement; price reduction reflecting present-value remediation cost.

HVAC at end of useful life: €8K-€25K equipment replacement; price reduction reflecting cost.

Pool surface or plant needing renewal: €8K-€30K (€8-15K for surface render, €15-30K for full plant); price reduction reflecting cost.

Cedula de habitabilidad expired or never issued: administrative remediation typically €1K-€4K; price reduction reflecting hassle and time.

For the broader cost framework of remediation see [Marbella property renovation cost article](/article-marbella-property-renovation-cost-en).

**Walk-through findings (no action required).**

Minor cosmetic issues that are normal for the property's age
Isolated tile cracking that is not symptomatic of broader issue
Normal wear and tear consistent with recent maintenance pattern
Documentation gaps that are administratively resolvable in 1-4 weeks
Decorative dating that the buyer was already planning to refresh

## Using the survey in negotiation

The survey's value compounds when used in structured negotiation. Generic "the survey raised some concerns, can we discuss price?" produces weak negotiation outcomes. Specific "the survey documents three findings requiring remediation cost of approximately €185K — itemised here — we request a corresponding price reduction" produces better outcomes.

**Documentation discipline.** Each negotiation point should reference the specific survey page, the specific finding language, the specific remediation cost estimate (ideally cross-referenced to a contractor quote or industry-standard pricing), and the requested price adjustment. The package — survey extract, contractor quotes or pricing references, requested price reduction — is the buyer's negotiation deliverable.

**Realistic adjustment ranges.** Sellers typically accept 50-100% of documented remediation costs as price reduction, depending on negotiation context. A finding with €25K documented remediation cost typically converts to €15-25K price reduction. Sellers rarely accept more than 100%; sellers in soft-market or motivated-seller positions sometimes accept above 100% on individual items as concession.

**Walking versus reaching.** If the survey finds material adverse issues and the seller refuses reasonable price adjustment, the buyer's discipline is to walk. The reservation deposit forfeit (typically €6-30K) is the small insurance cost of avoiding a problematic property. Buyers who reach to close gaps on properties with documented adverse survey findings typically learn within 12-18 months that they overpaid or bought a problem.

For the construction defect framework if findings emerge post-purchase, see [construction defect claims article](/article-marbella-property-construction-defect-claims-en).

## When to call Muse

Before commissioning the survey, ideally before signing the reservation contract that triggers the survey window. The choice of surveyor (firm, individual seniority, scope specification) materially affects survey quality and negotiation outcomes. Founder Max Bykov maintains professional relationships with three preferred Marbella arquitecto técnico firms with consistent quality across hundreds of surveys, plus several bilingual UK-RICS-experienced surveyors for the dual-survey approach common at the €5M+ tier.

WhatsApp Max on **+34 600 231 113** or email **maxim@musemarbella.es**. Two offices in Marbella; the team coordinates survey commissioning and the post-survey negotiation strategy as standard buyer-side service. For the broader due diligence framework see [due diligence stack article](/article-marbella-property-due-diligence-stack-en) and the second-viewing observations that feed into survey commissioning in our [second viewing checklist](/article-marbella-property-second-viewing-checklist-en).