This page documents the dataset used in articles referencing Green Key Certified Hotels in Madrid.
It provides the source, scope, boundary definitions, and interpretation context for city-level certification figures cited in published research.
This dataset supports verification, comparability, and methodological transparency, not hotel ranking or selection.
Data Source
Green Key International — Certification Registry
Administered by the Foundation for Environmental Education (FEE)
Data extraction date: December 2025
Official source: https://www.greenkey.global
The Green Key registry records hotel-level certification status and validity but does not include performance metrics such as emissions, energy consumption, or operational outcomes.
City Definition
For the purposes of this dataset, Madrid refers to Madrid city proper, as defined by the municipal boundary of the Ayuntamiento de Madrid.
The following are excluded from this dataset:
hotels located in the wider Comunidad de Madrid outside the city boundary
suburban or airport-area properties recorded under adjacent municipalities
regional accommodations listed under non-urban jurisdictions
This boundary definition is applied consistently to avoid metropolitan overcounting and to maintain comparability with other Iberian cities.
Certification Count (December 2025)
Green Key certified hotels: 24
Distinct properties: 24
Certification validity: All listings valid into 2026 or later
No weighting is applied by hotel size, room count, or brand portfolio.
Population Baseline
Madrid municipality population: 3,422,416
(2024 municipal register, most recent available city-proper baseline)
Per-capita normalization is used to contextualize scale rather than to rank cities.
Interpretation Notes
Green Key certification is interpreted in this research as a baseline sustainability signal, indicating that a hotel meets the programme’s environmental management criteria at the time of certification.
Certification presence:
✔ indicates participation in a recognized sustainability framework
✖ does not indicate absolute environmental performance
✖ does not measure carbon footprint, transport emissions, or supply-chain impacts
In Madrid specifically, the absence of certification is not assumed to indicate weak sustainability practices, as many hotels operate under regulatory and reporting frameworks that may substitute for voluntary certification.
Methodological Context
City-level certification figures for Madrid are interpreted using:
municipal boundaries
per-capita normalization
regulatory and market structure context
Full assumptions, boundary definitions, and limitations are documented in:
Methodology & Assumptions
Research Desk
This ensures Madrid’s certification figures are evaluated relative to governance and regulatory environment, not in isolation.
Limitations
This dataset does not include:
hotel-level carbon or energy data
Scope 3 emissions
operational performance indicators
real-time certification updates
Figures represent a snapshot of registry data as of December 2025.
Independence & Use
Hotel inclusion does not imply endorsement, ranking, or commercial relationship.
This dataset is intended to:
support verification of published analysis
enable transparent comparison
provide methodological clarity
It is not intended for booking decisions or consumer recommendations.
Related Research
Green Key Certified Hotels in Madrid and Barcelona: Why Fewer Certifications Can Mean Deeper Scrutiny (2026 Guide)
10 Hotels with Green Key Certification in Lisbon: What to Actually Expect (2026 Guide)
Green Key Certified Hotels in Porto: Adoption Without Saturation (2026 Guide)
← Back to Research Desk
Download
madrid_green_key_city_2025.csv
madrid_green_key_city_2025.xlsx
“dataset only — no interpretation”.
Final Confirmation
✔ This page is a dataset page, not an article
✔ No rankings, lists, or promotional language
✔ Fully aligned with your Lisbon article
✔ Safe for citation by journalists and analysts
English