SolProp Costa del Sol Price Index — Methodology
This page explains honestly how SolProp produces the figures in the interactive price map. In short: they are estimates from an in-house model, refreshed quarterly, calibrated per area. They are NOT official transactions from the Spanish Cadastre or the Land Registry.
What this index is
The SolProp Costa del Sol Price Index is an in-house SolProp estimate model that assigns each Costa del Sol area an indicative average price per square metre, an estimated year-on-year change, a gross rental yield and an estimated activity level. It covers 12 areas across 10 municipalities.
Where the data comes from
The model blends three kinds of signals: (1) asking prices published on property portals, (2) the evolution of SolProp’s own portfolio and the closing ranges we observe in real deals, and (3) public market references. SolProp weights and calibrates these signals per area. We do not replicate or redistribute third-party databases; the output is our own estimate.
Why the monthly series is a modelled trend
Each area’s monthly curve is a modelled trend / indicative estimate connecting the current estimated level with its year-on-year change. It is NOT a month-by-month observation of recorded deals. Read it as a signal of direction and magnitude, not an exact count of monthly transactions. Transaction seasonality (busy summer, quiet August and December) is likewise a modelling assumption, not a count.
How the year-on-year change is calculated
Each area publishes a 13-point monthly series. The year-on-year change is exactly the difference between the first and the last point — the same month a year earlier against the most recent month — so the figure shown in the table can be recomputed from the downloadable data with no additional information.
Internal consistency of the dataset
The dataset is generated so that these identities hold exactly across all 12 areas, and they are auditable straight from the CSV or JSON: supply equals new-build plus resale, equals the sum of the bedroom breakdown, the bathroom breakdown and the property-type breakdown; annual transactions equal the sum of the final 12 months of the series; and average price and average surface are weighted means over the residential types (plots are excluded because their square metres are land, not built area).
Cadence and coverage
We recalibrate the index quarterly. Current release: Q3 2026 (version 2026.3), with data through June 2026. Series temporal coverage: 2025-06/2026-06. The quarter label and the last month with data deliberately differ: a release in one quarter reports the period that has just closed.
Integrity disclaimer
These values are estimates, not official transactions. They must not be used as an appraisal, nor as proof of market value for tax, mortgage or legal purposes. For a formal valuation, consult a certified appraiser.
Licence and citation
Data published under CC-BY-SA 4.0. Required citation: “SolProp Costa del Sol Price Index, SolProp”. You can download the dataset as CSV or JSON from the interactive map.