Dar de alta una división en Propiedad Horizontal en el Catastro

What you need to have at hand

1. Cl@ve or certificado digital (if you use a certificado, have AutoFirma installed).
2. Escritura de división horizontal complete (and obra nueva if applicable), preferably with Registro de la Propiedad entry note.
3. Referencia catastral of the finca matriz and the recibo del IBI.
4. Planos by floor with superficies of each unit, and the cuadro de coeficientes (must add up to 100%).
5. Licencia de obra/primera ocupación or municipal document if there was obra nueva or an extension.
6. Modelo 900D if you act as representative and the document of appointment (president/administrator/power of attorney).

Documentation

• Escritura (división horizontal and, if applicable, obra nueva). Upload the full PDF, with indexes and annexes.
• Planos legibles (PDF): by floors, with superficies construidas and útiles, and list of anejos.
• Cuadro de cuotas per private element. Check it adds up to exactly 100%.
• Referencia catastral of the finca matriz and IBI (to identify without mistakes).
• Licencia municipal or certificado final de obra if you declare obra nueva (902N).
• DNI/NIF of the declarant and Modelo 900D if you present for someone else.

Step by step

1. Check if it's already there: go to https://www.sedecatastro.gob.es > Identify yourself > Mis inmuebles. If the flats/units don't appear, continue.
2. Start the 903N: Trámites > Declaraciones catastrales > División/Segregación/Agrupación (Modelo 903N). Select the finca matriz and enter its referencia catastral.
3. Add the elements: for each flat/shop, set uso, planta, superficies and coeficiente. Add anejos (garage, storage) and link them to the correct element.
4. Attach evidence: upload the full escritura, planos and cuadro de cuotas. If there's obra nueva not yet in Catastro, also submit 902N (same Sede, trámite “Nueva construcción/Ampliación”) and attach obra nueva paperwork and certificado final.
5. Sign and register: sign with Cl@ve Firma or certificado. If you act as representative, add 900D and the appointment document. Save the justificante.
6. Subsanaciones: check “Mis expedientes”. If they ask for clarifications on superficies/planos, reply from there within the deadline (don’t leave it to the last day).
7. Result: when they resolve, download the Consulta descriptiva y gráfica for each element. Check superficies, usos y anejos match the escritura. If you spot an error, request rectificación from the Sede.

Tricks that save you time

• Clear, small PDFs: split escritura and planos into files <10 MB so uploads don't fail.
• Name files clearly ("Escritura_division.pdf", "Planos_planta1.pdf"). Avoid confusion in subsanaciones.
• If the notario already communicated, Catastro can still delay. Submitting the 903N yourself usually unblocks things.
• Check the uso of each element (vivienda, local, garaje) matches the licencia and the escritura.
• If there are many elements, prepare a list with superficies and cuotas beforehand so you don't mistype.

Common mistakes that can derail the procedure

1. Cuotas that don't add to 100%: the expediente is stopped automatically.
2. Mixing useful surface with built surface: Catastro works with construida; check what you enter.
3. Forgetting the 902N when there's obra nueva not catastrada: without it they won't create the elements correctly.
4. Not providing clear planos: if the floor isn't readable or measurements are missing, they'll ask for subsanación and you'll lose weeks.
5. Submitting without representation: if you act for the community/another owner and don't add 900D and the appointment, it will be inadmissible.
6. Signing with an old browser: AutoFirma fails on outdated browsers. Use current Chrome/Edge or Cl@ve Firma.