Building works: obra menor / obra mayor

Documents to prepare

• Property identification: address, cadastral reference, photographs and available existing plans. A cadastral record alone does not prove planning legality.
• Applicant identity and, where applicable, representation. Ask separately about owner permission and the community of owners for shared elements.
• A complete work description and an itemized budget: measurements, materials, labour and taxes shown separately. Ask which amount is the presupuesto de ejecución material (PEM).
• The municipality's current form and a drawing of existing versus proposed conditions where requested. Ask whether a memoria descriptiva, memoria técnica or full proyecto técnico is needed.
• A list of required fees, ICIO, deposits and additional permissions, with payment evidence only when the correct procedure and amounts are confirmed.
• Contractor and technical-team details, waste arrangements and safety documentation appropriate to the work; request the municipality's exact checklist.

Steps in order

1. 1Define the entire project before choosing a category. Include external works, installations, common parts and changes of use; do not split one project to make it appear minor.
2. 2Ask Urbanismo to confirm land classification, permitted use and heritage/protection status for this property. Describe any existing works whose authorization is uncertain.
3. 3Obtain the current municipal classification and document checklist. Record the official procedure name and reference; an informal label from a contractor is not confirmation.
4. 4Ask a competent professional whether a technical project, structural checks, technical direction or other specialist documents are required. Agree who prepares and signs each document.
5. 5Check the municipal fee and ICIO rules, any refundable waste/public-space deposit and professional fees separately. Confirm assessment basis, payment timing and possible final adjustment; there is no single Spain-wide quote.
6. 6Arrange additional heritage, public-space or other sector permissions and private consents where applicable. Confirm which must be obtained before the main submission or before work starts.
7. 7Review the official application or declaration and all attachments. File only through the competent municipality; keep the complete submitted version and receipt. Never sign a declaration of compliance that has not been checked.
8. 8Before scheduling the start, confirm the enabling document, any required waiting period, prior notices and conditions. Payment or filing alone does not establish that every project may start immediately.
9. 9Keep the approved scope, required documents and permits accessible during the works. Check working hours, waste removal, inspections and expiry; ask about amendments before changing the project.

After submitting

• Ask which completion notice and technical completion certificates apply. Record whether a first-occupation/use procedure or installation certificates are needed before occupation or use.
• Keep waste delivery records, final invoices and inspection results. Request return of applicable deposits through the specified procedure.
• Confirm any final ICIO adjustment and whether the changed building details require a cadastral declaration or land-registry update; completion does not update those records automatically.
• Keep the final authorized drawings, certificates, warranties and maintenance instructions together with the original decision and all amendments.

Useful question in Spanish

Quisiera confirmar el título habilitante para estas obras en este inmueble. ¿Corresponde licencia de obra menor o mayor, declaración responsable o comunicación previa? ¿Qué proyecto, documentos, autorizaciones adicionales, tasas, condiciones de inicio y trámites de finalización se exigen?