Note
Renovation permits in Spain: obra mayor and obra menor
Quick answer
Permits for works are set by the municipality within regional law, and the names and thresholds vary. Obra mayor and obra menor are the common terms for big and small works. Ask the town hall in writing what your works need, and do not start before you have it.
Applies toOwners and buyers planning repairs, alterations or extensions in Spain.
On this page: 12 sections
§ 1Who decides
Planning and building permission in Spain is mostly a municipal matter, within a framework set by regional law and national law. That is why the names, forms and thresholds differ between towns. This page belongs to the chapter in renovation projects in detail. We did not read the rules for any particular municipality.
§ 2Obra mayor and obra menor
Spanish usage separates larger works, obra mayor, from smaller works, obra menor. Larger works usually involve structure, facades, extensions, new floors, changes of use or changes in the number of homes, and they need a technical project signed by a qualified professional. Smaller works usually involve repairs and finishes without changing structure or use. Some regions have replaced the older licence for certain works with a statement by the owner, called a declaración responsable. Ask the town hall which applies.
§ 3Ask in writing
Ask the town hall, in writing, what permission your planned works need, what documents to file and how long it normally takes. Ask whether other bodies must approve, for example for heritage, coastal or rural land. Keep the reply. If you are buying, ask before the deed and ask your lawyer to read the answer.
§ 4Heritage and coast
Protected buildings, historic centres and properties near the coast can have extra rules. Works in the protected zone near the shore are limited, as the page on coastal law explains. Older farm buildings can be listed. The rural property chapter explains the points for a cortijo.
§ 5Communities
In a flat or an estate, the community may have to agree to works that affect the facade, the structure or common parts. Ask the administrator before you plan, and read the statutes.
§ 6Taxes and fees
Permits can carry municipal taxes and fees, and the amount varies by town. Ask the town hall for the scale. The costs of the permit belong in your budget, as renovation cost explained explains.
§ 7Contractors
Builders should work to the permit. Ask to see it. Do not let a contractor start on the promise that it will be arranged later.
§ 8Regularising
If work was done without permission, the owner may be able to regularise it, depending on the rules. The legal process section explains irregular properties and the risks.
§ 9After the works
Keep the plans and the completion certificate, and ask your architect whether the registry and the cadastre need updating.
§ 10Neighbours
Works affect neighbours through noise, dust and scaffolding. Tell them before you start, and ask the town hall about working hours and rules for skips and street occupation. Good relations help if something goes wrong.
§ 11Keep a file
Keep every form, receipt, reply and permit in one file, in date order. If the town hall asks a question years later, or you sell, the file shows that the works were authorised. Ask your architect for a copy of everything they filed.
§ 12More on this topic
Restoring a ruin explained explains the steps of restoring a ruin.
FAQRelated questions
What is obra mayor and obra menor?
Common terms for larger and smaller works. Structural changes, extensions and changes of use are generally larger, while painting and small repairs are generally smaller. The exact thresholds and the type of permission vary by municipality.
Who gives the permission?
The town hall decides for most works, within regional and national rules. Some properties also need approval from a regional authority, for example for heritage, coast or rural land. Ask the town hall which bodies must agree.
What if I start without a permit?
The town hall can stop the work and fine you, and the building may become irregular, which affects insurance, sale and financing. If work has begun, stop and ask your lawyer how to regularise it.
Sources
- Boletín Oficial del Estado: Texto refundido de la Ley de Suelo y Rehabilitación Urbana (RDLeg 7/2015) (official source, opens in a new window), Arts. 15, 17 and 21: duty to conserve; rural and urbanised landLast checked 17 October 2026
- Boletín Oficial del Estado: Ley 38/1999 de Ordenación de la Edificación (official source, opens in a new window), Articles 17 and 19; disposiciones adicionales primera y segundaLast checked 17 October 2026
- Boletín Oficial del Estado: Ley 22/1988 de Costas (BOE-A-1988-18762) (official source, opens in a new window), Arts. 7, 8, 12 to 15, 23 to 28 and 13 bis; text read to article 44, transitional provisions not readLast checked 18 October 2026
Legal note. How the process works in general. It is not legal advice, and it never replaces an independent Spanish lawyer acting for you.