Renovating a property in Spain is one of the most common decisions among property owners who want to improve comfort, update installations, or increase the value of their property. However, behind any renovation lies a complex legal framework that must be understood before starting. It is not just about choosing a modern design or hiring a construction company: the legality of the renovation conditions the entire process, from the initial planning to the possibility of selling or renting the property in the future.
Here, we will explain the main legal considerations for renovating a property in Spain, so that any owner can understand what must be complied with to avoid fines and legal problems.
Types of Works: Major and Minor Works
The first step in legally renovating is to identify whether it is a minor work or a major work, since the procedure, documentation, and license cost will depend on this.
- Minor works: simple interventions that do not affect the structure or common elements. Examples include painting, changing flooring, replacing tiles, or changing interior carpentry. In most municipalities, it is enough to submit a prior notification or a sworn declaration to the town hall. In cities like Madrid or Barcelona, this procedure even allows work to begin immediately, under the owner’s responsibility.
- Major works: include any action that alters the structural distribution of the property, modifies façades, affects load-bearing walls, increases the surface area, or involves a change of use (for example, converting a commercial premises into housing). In these cases, a technical project prepared by an architect or building engineer and endorsed by their professional association is required, along with a major works urban planning license granted by the town hall.
Royal Legislative Decree 7/2015 on Land and Urban Rehabilitation establishes the basic legal framework in Spain, and each municipality develops these categories in its General Urban Planning Plan (PGOU) and municipal ordinances. This means that what may be considered a “minor work” in one municipality could be considered “major work” in another.
Example: closing a terrace in Seville is usually processed as a major work because it affects the façade, while in other municipalities it may be accepted as minor with just a sworn declaration. Therefore, it is always essential to check local regulations.
The Urban Planning License: An Essential Requirement
The urban planning license is the authorization granted by the town hall to carry out works, renovations, or demolitions. Its purpose is to ensure that the project complies with urban planning, safety, energy efficiency, and sometimes environmental regulations.
The usual procedure for obtaining it is:
- Preliminary consultation with the town hall’s urban planning department to check viability and the type of license required.
- Preparation of the technical project (for major works) or descriptive report (for minor works).
- Payment of municipal fees and the Construction, Installations, and Works Tax (ICIO), which usually ranges between 2% and 6% of the total budget.
- Submission of the application, accompanied by property documentation (deed or rental contract), plans, and compliance justifications.
- Assessment by municipal technicians, who may request corrections.
- Granting of the license, valid for a limited period to start and finish the works.
- Start of the works, always within the license validity period.
- Final inspection and certificate of works: issued by the supervising architect, necessary for the occupancy certificate or first occupancy license.
Starting works without a license may result in fines, immediate suspension of the works, demolition orders for what has been executed, and even criminal liability. Article 319 of the Spanish Criminal Code defines unauthorized construction or renovation on non-developable or protected land as an urban planning crime.
Renovations in Homeowners’ Associations
If the property is part of a building governed by the Horizontal Property Law (LPH), a distinction must be made between works on private and common elements:
- Article 7.1 LPH allows each owner to carry out works inside their dwelling, provided they do not alter common elements or cause harm to other neighbors.
- Any modification of façades, courtyards, roofs, staircases, load-bearing walls, or general installations requires prior authorization from the homeowners’ association.
- Article 10 LPH obliges the community to undertake certain necessary works, such as structural repairs or accessibility improvements requested by a person with a disability or someone over 70 years of age.
Example: if a neighbor decides to open a hole in a load-bearing wall, not only do they need a major works license, but also the community’s approval, since it is a structural common element. If done without consent, the community may demand legal restoration to the original state.
Renovation of Protected Buildings and Historical Heritage
Spain has many buildings with heritage protection. When a property is classified as a Bien de Interés Cultural (BIC) or included in the municipal Urban Catalogue, renovations are subject to additional restrictions:
- Interventions on façades, exterior carpentry, roofs, or unique elements require authorization from the regional Historical Heritage Commission.
- Only materials and finishes that respect the original aesthetic are allowed.
- In some cases, even the interior layout is restricted.
Law 16/1985 on Spanish Historical Heritage and regional regulations establish sanctions for unauthorized works on protected buildings.
Noise and Working Hours Regulations
Neighborhood coexistence is another critical issue, since renovations inevitably cause disturbances. For this reason, each town hall regulates working hours and noise levels in its acoustic protection ordinances:
- In most municipalities, works are only allowed Monday to Friday from 8:00 a.m. to 9:00 p.m., and Saturdays from 9:30 a.m. onwards.
- Maximum noise levels are usually set at 35 dB during the day and 30 dB at night.
Violating these rules may lead to fines and the suspension of the works. It is advisable not only to comply with the legal hours but also to notify the most affected neighbors in advance to reduce conflicts.
Waste Management and Occupation of Public Space
All works generate rubble and waste that must be managed in accordance with Law 22/2011 on Waste and Contaminated Land:
- The owner must hire an authorized manager to remove and process waste.
- If a container is needed on public roads, a permit from the town hall is required.
Failure to comply may result in fines and the obligation to repair damage to public space or third parties.
Energy Certification and Compliance with the Technical Building Code
When the renovation affects the thermal envelope (façades, roofs, windows) or HVAC systems, the Energy Efficiency Certificate must be updated, as regulated by Royal Decree 390/2021.
In addition, the Technical Building Code (Royal Decree 314/2006) requires all interventions to meet safety, habitability, energy efficiency, and accessibility standards. For example:
- Window replacements must demonstrate appropriate thermal transmittance values.
- In larger renovations, ramps, elevators, or adapted bathrooms may be required to comply with the General Disability Law (Royal Decree-Law 1/2013).
Owner’s Responsibilities During Renovation
The owner promoting the renovation assumes the role of developer under the Building Act (Law 38/1999 – LOE). This entails responsibilities such as:
- Being liable for material damages that may arise during execution.
- Ensuring the safety of workers and neighbors, in line with occupational risk prevention regulations.
- Hiring qualified professionals with liability insurance.
Consequences of Non-Compliance
Failing to comply with legal requirements has serious consequences:
- Administrative fines ranging from €600 to over €6,000, depending on the municipality.
- Immediate suspension of works.
- Demolition of illegally executed constructions.
- Criminal liability in the most serious cases, under Article 319 of the Criminal Code.
- Difficulties in selling or mortgaging the renovated property, since notaries and the Land Registry may require proof of legality.
In conclusion, renovating a property in Spain is not an improvised process. Every renovation is legally required to comply with urban planning licenses, building regulations, and community coexistence rules. Failing to do so exposes the owner to fines, delays, and economic losses.
Therefore, before starting any renovation it is advisable to:
- Consult the PGOU and municipal ordinances.
- Hire a registered architect or building engineer to supervise the work.
- Obtain the necessary authorizations from the homeowners’ association.
This way, the project will not only be an aesthetic and functional success but also a safe and fully legal process, increasing the value of the property and preventing future problems.