Data Sources

Where our data comes from

These are key sources used by the product areas below—not a claim that every signal comes directly from an official dataset. Each entry states its source, coverage, method, limitations, update method, and lineage review date.

The date below records when this lineage was reviewed. We do not label pipeline runs as source freshness because a successful run can reuse an older upstream release.

Lineage reviewed as of 2026-07-13

Property listings

Agency and public-register records are normalised into listing records and deduplicated where matching confidence is sufficient.

Original agency listing page
Dataset / API identifier: listing.sourceUrl
Source type: Agency sourceUpdate method: Updated when the source publishes
Source URL varies by listing
Clicpublic public auctions
Dataset / API identifier: clicpublic
Source type: Official public dataUpdate method: Scheduled import
Chambre des Notaires — adjudications
Dataset / API identifier: notariat-auction-api
Source type: Official public dataUpdate method: Scheduled import
BusinessTransfer listings
Dataset / API identifier: businesstransfer
Source type: Public websiteUpdate method: Scheduled import

Source details

Coverage: Publicly accessible agency pages and named public registers; coverage varies with source access.
Method: Records are normalised and deduplicated when matching confidence is sufficient.
Known limitations: Source pages can be stale or inaccessible, and duplicates may remain.

Prices & market value

Selected official statistics support commune benchmarks and price-comparison signals.

Observatoire de l’Habitat — rental prices
Dataset / API identifier: rental_price_index
Source type: Official public dataUpdate method: Manually verified import
Observatoire de l’Habitat — sale prices
Dataset / API identifier: housing_price_index
Source type: Official public dataUpdate method: Manually verified import

Source details

Coverage: Selected commune-level official statistics and named price datasets.
Method: Used for selected benchmarks and price-comparison signals.
Known limitations: Not every valuation uses these datasets; asking prices are not transaction prices.

Maps, zoning & risk

Official map layers support zoning and risk context where exact coordinates and the relevant layer are available.

Luxembourg Geoportail OGC API Features
Dataset / API identifier: flood · noise · cadastral · nature · heritage layers
Source type: Official public dataUpdate method: Scheduled snapshot
data.public.lu — communal PAG datasets
Dataset / API identifier: CKAN tag: pag
Source type: Official public dataUpdate method: Scheduled import

Source details

Coverage: Layer-specific coverage for Luxembourg; property-level checks require exact coordinates.
Method: Coordinates are matched against the relevant published map layer.
Known limitations: Publication dates and geographic coverage vary by layer.

Demographics & safety

Selected public-statistics datasets support commune context.

STATEC LUSTAT — population by commune
Dataset / API identifier: LU1,DF_X021
Source type: Official public dataUpdate method: Scheduled import
Police Grand-Ducale — crime statistics
Dataset / API identifier: LUSTAT DF_C5201
Source type: Official public dataUpdate method: Manually verified import

Source details

Coverage: Selected public statistics by commune or other published geography.
Method: Imported and aggregated for commune context and derived indicators.
Known limitations: Reference year and geographic granularity vary; derived indicators must disclose any fallback.

Schools

School context comes from the dataset named on each feature.

ChatHome family-amenities reference file
Dataset / API identifier: luxembourg_family_amenities.json
Source type: Derived by ChatHomeUpdate method: Static reference dataset
External source not documented
Ministry of Education school directory
Dataset / API identifier: school_data
Source type: Official public dataUpdate method: Manually verified import

Source details

Coverage: Feature-specific school coverage; discovery counts use a static reference dataset.
Method: The consuming feature identifies whether it uses reference or imported ministry data.
Known limitations: Reference and imported datasets have different coverage and refresh paths.

Transport & commute

Timetables, precomputed profiles, and on-demand route estimates are separate inputs.

Administration des transports publics — GTFS
Dataset / API identifier: dataset 5a2a58b9111e9b7f34fc6606
Source type: Official public dataUpdate method: Scheduled snapshot
Mobiliteit.lu HAFAS departure API
Dataset / API identifier: ATP OpenAPI · departureBoard
Source type: Official public dataUpdate method: Scheduled snapshot
Google Routes API — computeRouteMatrix
Dataset / API identifier: distanceMatrix/v2:computeRouteMatrix
Source type: Commercial APIUpdate method: Scheduled snapshot

Source details

Coverage: Coverage varies across live lookups, timetable feeds, and precomputed profiles.
Method: Request-time routes, published timetables, and scheduled snapshots are kept separate.
Known limitations: A live lookup does not make precomputed profiles or timetables real-time.

Mortgages & finance

Published mortgage offers are sampled from the named providers.

Credihome — current mortgage rates
Dataset / API identifier: media_mortgage_rates
Source type: Public websiteUpdate method: Scheduled import
Spuerkeess — housing loan
Dataset / API identifier: bank_mortgage_products:spuerkeess
Source type: Public websiteUpdate method: Scheduled import
BIL — mortgage
Dataset / API identifier: bank_mortgage_products:bil
Source type: Public websiteUpdate method: Scheduled import
BGL BNP Paribas — prêt immobilier
Dataset / API identifier: bank_mortgage_products:bgl
Source type: Public websiteUpdate method: Scheduled import
Raiffeisen — R-Logement
Dataset / API identifier: bank_mortgage_products:raiffeisen
Source type: Public websiteUpdate method: Scheduled import
ING Luxembourg — crédit immobilier
Dataset / API identifier: bank_mortgage_products:ing
Source type: Public websiteUpdate method: Scheduled import

Source details

Coverage: Named provider offers sampled by ChatHome; not the whole market.
Method: Published product and rate information is imported or manually verified.
Known limitations: Rates and eligibility can change before the next check. Confirm with the provider.

Air & noise

Station readings and strategic noise maps are separate sources.

AQICN / WAQI station readings
Dataset / API identifier: air_quality
Source type: Community aggregatorUpdate method: Manually verified import
Luxembourg Geoportail strategic noise maps
Dataset / API identifier: road/rail Lden + Lnight · air Lden
Source type: Official public dataUpdate method: Scheduled snapshot

Source details

Coverage: Named air-monitoring stations and published strategic noise-map layers.
Method: Station readings and static map publications are tracked separately.
Known limitations: Station readings may be near-live; noise maps are not real-time and coverage varies.

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Where our data comes from

The date below records when this lineage was reviewed. We do not label pipeline runs as source freshness because a successful run can reuse an older upstream release.

Lineage reviewed as of 2026-07-13