Cadastral reference - 14 characters or 20
Twenty characters identify one specific dwelling; the first 14 identify the parcel, which is the building. That is why a 14-character reference cannot name one flat: it is missing the very part that separates one unit from another inside the same building. Fourteen answers building questions; twenty answers dwelling questions.
The 20, and the 14 inside them
A dwelling's cadastral reference is 20 characters and is unique per property. Its first 14 identify the parcel - the plot and the building standing on it. Whatever comes after those 14 is what distinguishes one unit from another inside the same parcel, and it is exactly what is missing when somebody hands you a 14-character reference.
One very useful property follows. Two dwellings are in the same building if, and only if, their references start with the same 14 characters. No interpreting addresses, no comparing street names. Either the prefix matches or it does not.
Why 14 characters cannot name a flat
Because a parcel under horizontal division holds many properties, and all of them share those 14 characters. Asking a 14-character reference to identify one flat is asking it to choose between twelve equally valid answers. It usually turns up that way on undivided properties or in older paperwork.
We do not choose for you. On the energy-certificate check, when all we have is the 14 we return the match level and leave the rating columns blank, on purpose: a building's certificate is not each dwelling's certificate, and filling that letter in would be inventing a fact nothing backs. The same discipline applies to the tourist licence.
Which question each one answers
- 20 characters - does this dwelling have a tourism registration, and is it current?
- 20 characters - what energy certificate is on record for this dwelling?
- 14 characters - how many registered holiday lets are there in this building?
- 14 characters - does this building sit inside a moratorium zone?
Where the rules demand it
In the Valencian Community an individual cadastral reference must appear in the responsible declaration and in the rental contract, and properties already registered had to supply it by 31 December 2024 or be struck from the register. "Individual" is the word doing the work: that is the 20-character one, not the parcel's.
The same region's municipal urban-planning compatibility report must also identify the property by its cadastral reference, along with the land classification and the permitted uses. So the identifier is not a convenience of ours - the file itself asks for it.
Which registers publish it, and why that limits the answers
Only three regional registers publish a cadastral reference per entry: Andalusia carries one on 94% of the rows in our mirror, the Valencian Community on 99% and Murcia on 72%. Every other Spanish register publishes none at all.
So the building question only has an answer in those three regions. That is not a product decision: with no published reference there is no prefix to group on, and any count built on addresses would be a presentable invention. The figures move with every overnight load, so they carry a date.
Where to find it, and how not to break it
On the IBI (council tax) bill, in the deed, and at the Catastro's online office. In portal feeds it is sometimes there and sometimes not - they are marketing exports. Resales Online usually carries it; Kyero and Idealista carry it when the advertiser filled it in.
- A 14-character reference pasted into the dwelling field - it names the building, not the flat
- Spaces or hyphens copied out of a PDF, which make the match fail without saying why
- The garage or storeroom reference instead of the dwelling's
- Two flats in the same building given the same full reference
Check a licence number
Free, no sign-up, nothing stored. Try VUT/MA/102186.
Sources
- Catastro online office - cadastral reference lookup — 20 characters per property, the first 14 per parcel
- Decree-Law 9/2024 (Valencia region) — individual cadastral reference in the responsible declaration and the contract, and the 31 December 2024 deadline for those already registered
- Real Decreto 390/2021, energy performance certification of buildings (consolidated) — art. 6.6, the regional register the reference is matched against
- Registro de Turismo de Andalucía (OpenRTA), open data CC BY 4.0
- Registre de Turisme de la Comunitat Valenciana, GVA open data (CC BY)
- ITREM public register
Verified against the sources above on 2026-09-27. LicenceDesk is operational guidance, not legal advice.
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