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Methodology

How we source the data behind BuyaProp

BuyaProp is an independent intelligence platform for international buyers in Spain. Every figure on the platform is grounded in a clear source hierarchy — official registries first, market data second, advisory research third. This page documents the sources, their current integration status and the rules our AI follows when answering.

Independent, buyer-side 3-tier source hierarchy Cited, never invented

Platform status

BuyaProp is in active build. Most figures currently shown across the platform are illustrative placeholders while we integrate the sources listed below. Each source has a clear status: Live (connected and refreshed), Planned (integration in progress) or Roadmap (committed, not yet started). Nothing on the platform should be relied on for financial, legal or tax decisions until a source is marked Live and dated.

Tier 1 — Official sources

Tier 1 — Official sources

Core truth layer. Government registries and central institutions. Used for transaction volumes, registered prices, demographics and macro indicators.

Colegio de Registradores de España

Planned

Official property registry. Closest source to ground truth for completed Spanish property sales.

Used for

  • •Foreign buyer transaction volume
  • •Nationality breakdowns
  • •Province statistics
  • •Quarterly sales data
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Consejo General del Notariado

Planned

Notarial deed data — actual signed transaction prices, mortgage usage and non-resident buyer behaviour.

Used for

  • •Average prices paid by foreigners
  • •Non-resident buyer behaviour
  • •€/m² statistics
  • •Cash vs mortgage purchases
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INE — Instituto Nacional de Estadística

Planned

National statistics: demographics, migration, tourism and property transfer data.

Used for

  • •Migration trends
  • •Foreign population growth
  • •Tourism statistics
  • •Demographics
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Ministerio de Vivienda y Agenda Urbana

Roadmap

Housing policy, construction permits, new-build supply and national housing market data.

Used for

  • •Housing policy
  • •Construction permits
  • •New-build supply
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Banco de España

Planned

Central bank data: mortgage market, interest rates, credit conditions and affordability.

Used for

  • •Mortgage rates
  • •Financing trends
  • •Housing affordability
  • •Credit conditions
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Tier 2 — Market intelligence

Tier 2 — Market intelligence

Live market sentiment and pricing. Asking prices, demand signals, valuations and rental benchmarks.

Idealista Data

Roadmap

The most comprehensive real-time Spanish market source — asking prices, demand and rental yields per micro-market.

Used for

  • •Asking prices
  • •Demand trends
  • •Rental yields
  • •Foreign buyer search interest
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Tinsa by Accumin

Roadmap

Independent valuations — appraisal-based pricing, regional comparisons and long-term trends.

Used for

  • •Valuation-based pricing
  • •Regional comparisons
  • •Long-term trends
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Fotocasa Research

Roadmap

Buyer sentiment surveys, rental affordability and demand-side research.

Used for

  • •Buyer sentiment
  • •Rental affordability
  • •Demand surveys
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Tier 3 — Institutional & luxury

Tier 3 — Institutional & luxury

International advisory research for the prime and luxury segments — Marbella, Mallorca, Ibiza, Barcelona prime.

Savills Spain Research

Roadmap

Prime and luxury market intelligence with strong Costa del Sol and Balearic coverage.

Used for

  • •Luxury buyers
  • •Marbella & Costa del Sol prime
  • •International investment
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Knight Frank Research

Roadmap

Global wealth and prime residential reports — UHNW buyer flows into Spain.

Used for

  • •UHNW trends
  • •Wealth Report
  • •Branded residences
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CBRE Spain

Roadmap

Commercial and residential investment research across Spanish markets.

Used for

  • •Investment market
  • •Capital flows
  • •Residential development
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JLL Spain

Roadmap

Living and residential capital markets research with Spanish focus.

Used for

  • •Living sector
  • •Residential capital markets
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AI source-priority rule

How the BuyaProp AI is instructed to handle data

When the platform's AI assistant answers questions about the Spanish property market, it follows this fixed rule. It is part of the system prompt — not a suggestion.

When answering questions about Spanish real estate statistics:
1. Prioritise official Spanish government and institutional sources.
2. Use Registradores and Notariado as primary transaction sources.
3. Use INE and Banco de España for macroeconomic and demographic analysis.
4. Use Idealista and Tinsa for market pricing and demand trends.
5. Always distinguish between asking prices, completed transaction prices and registered transactions.
6. Never invent statistics or estimates.
7. Cite the source used for every numerical claim.
8. If multiple sources conflict, prioritise official registries.

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