Did you know that more than 10,000 minor works permits (comunicats and assabentats) are requested in Barcelona every year? Often, when we visit apartments with our clients, I see the fear in their eyes at the thought of the Ajuntament de Barcelona bureaucracy.
Processing a license is the fundamental step to ensuring your home is safe, legal, and sustainable. In this post, we detail exactly what you need so that your renovation does not turn into an administrative nightmare. We accompany you through this process so that you only have to worry about choosing the finishes.
What is a Building License and Why is it Mandatory in Barcelona?
A building license is the official document that validates that your project complies with current urban planning regulations, as well as applicable technical regulations (including the Technical Building Code and habitability conditions for housing) and structural safety requirements.
It is mandatory because it guarantees the safety of the inhabitants, respect for the city’s architectural heritage, and neighborly coexistence. According to the Ordenança Reguladora dels Procediments d’Intervenció Municipal (ORPIMO), any physical intervention requires prior communication or a license.
You can consult the full text of the ordinance at the Electronic Office of the Ajuntament de Barcelona.
Types of Permits for Home Renovations in Barcelona
There are three levels of permits depending on the magnitude of the work and how it affects the building’s structure or distribution.
1. Assabentat d’obres (Notice of Works): Basic Aesthetic Renovations
The Assabentat d’obres is the permit for maintenance works that do not modify the distribution, the structure, or the common elements of the building.
It is used for changing the flooring, painting walls, renovating the kitchen, or replacing bathroom fixtures without moving the installations. It is a free and immediate procedure carried out electronically.
2. “Comunicación previa” (prior notification): Minor Works with Distribution or Minor Structural Changes
A comunicación previa is requested when you are going to modify the interior distribution of the home, such as knocking down a partition wall to join the living room and kitchen.
This permit requires a professional to prepare the necessary technical documentation. It is mandatory to pay the corresponding municipal fees and the ICIO tax before starting work. Within the comunicación previa regime in Barcelona, there are two types:
- Comunicat immediat: Requires documentary validation by the Col·legi d’Arquitectes de Catalunya (COAC) or an Entidad Colaboradora de la Administración (ECA). Once the favorable report is obtained and fees are paid, works can start almost immediately.
- Comunicat diferit: Also undergoes an initial review (COAC or ECA), but is subsequently subject to a municipal technical verification by the corresponding district. The start of works is deferred until the administrative verification period has passed (usually about one month), provided there are no requirements for corrections.
Generally, comunicats immediats correspond to smaller, less complex actions, while comunicats diferit apply to interventions with greater technical or urban impact, such as work on facades, roofs, or foundations.
3. Licencia de Obra Mayor: Major Works or Heritage Impact
The Licencia de obra (mayor) is the permit required for actions of greater technical complexity or significant urban impact, such as interventions in protected buildings, new construction, extensions, changes of use, or actions that significantly affect the building’s configuration.
In the case of buildings or elements protected by heritage status, works are usually subject to a license, requiring more exhaustive control by the City Council. While theoretical granting periods are a few months, in current practice in Barcelona, obtaining a license usually takes around 6–9 months or more.
Other Complementary Permits for a Comprehensive Renovation
Beyond the work itself, there are logistical matters we always recommend settling before starting.
Occupancy of Public Space (Debris Bags and Containers)
This permit is necessary to place containers or debris bags (Sacas de escombros) on the street. It is only required when these elements occupy public space (sidewalks or parking zones). If they are located within the private area of the site, it is not necessary. The cost depends on the surface area occupied and the duration.
Notice to the Community of Owners
According to the Horizontal Property Law, the owner must formally notify the community of any works. If the works affect common elements (structure, facades, general installations), approval by the community board is required—often requiring a qualified majority of 4/5 for structural interventions.
Technical Documentation and Requirements
For any procedure other than a simple Assabentat, the City Council will require documents that provide technical proof of your project.
When is it mandatory to present a project signed by an architect?
A project drafted by a competent technician (usually an architect) is necessary when the work:
- Affects structural safety (beams, pillars, load-bearing walls).
- Involves changes to the interior distribution.
- Alters the exterior configuration (facades, roofs).
- Involves a change of use (e.g., from commercial premises to housing).
In Barcelona, technicians must provide documentation ensuring compliance with habitability conditions and the Technical Building Code. You can find more information at the Col·legi d’Arquitectes de Catalunya.
Costs and Processing Times
| Permit Type | Estimated Time | Main Costs |
| Assabentat | Immediate | Free |
| Comunicat Immediat | Immediate (after validation) | Administrative Fees + 4% ICIO + COAC/ECA |
| Comunicat Diferit | ~1 month | Administrative Fees + 4% ICIO + COAC/ECA |
| Licencia Obra Mayor | 6–9 months | Administrative Fees + 4% ICIO + COAC/ECA |
- Tasa por servicios urbanísticos: A fixed administrative fee of approx. €50–€100.
- ICIO (Impuesto sobre Construcciones, Instalaciones y Obras): 4% of the PEM (Presupuesto de Ejecución Material).
- COAC/ECA Fees: Usually between 0.7% and 1.8% of the PEM.
Warning: Performing works without a permit in Barcelona can lead to significant fines, immediate halting of work, and the legal obligation to return the property to its previous state.
From our side, we strongly advise against carrying out any works (beyond what is covered by an Assabentat) without the proper permit. We are currently working with several clients to resolve urban planning compliance proceedings that arise in such cases, and we can confirm that these processes are neither quick, nor inexpensive, nor straightforward.
Frequently Asked Questions
Do I need a permit to paint my apartment?
Yes, you need an Assabentat d’obres, which is free and obtained instantly online.
Can I start the renovation immediately with an Assabentat?
Yes, but only for finishes. You cannot change the distribution or structural elements with this permit.
What happens if a neighbor reports me?
You will receive a visit from a municipal inspector who can stop the work and open a sanctioning file.
Is an architect necessary for a Comunicación Previa?
Yes, if the work involves a change in distribution or affects common elements.
As you can see, Barcelona has its rules, but following them is the best way to increase the value of your home with total peace of mind.
