Short answer: where to look and what to order
Before a renovation it pays to check two things: whether the building is in the architectural heritage catalogue and what the planning rules allow on that plot. In Barcelona both show up on the Ajuntament's Portal d'Informació Urbanística (PIU, urban information portal): type the address and you get the plot's record with zoning, plans, licence suspensions and protection level. It is free and needs no login, but what the portal shows is for information only.
If you need a document you can rely on, for a purchase, a project or a dispute, you order it through the Oficina Virtual: an informe urbanístic (planning report), a certificat urbanístic (planning certificate) or a plànol d'alineació (alignment plan). Any individual or company can request one and no documents are required. For other towns in the province there is the Generalitat's Mapa urbanístic de Catalunya, although the local Ajuntament has the final say.
Why it matters before a renovation
Barcelona uses four protection levels. Level A (Bé Cultural d'Interès Nacional) is set by the Generalitat. Level B (Bé Cultural d'Interès Local) by the Ajuntament and ratified by the Generalitat. Level C (Bé d'Interès Urbanístic) is entirely the Ajuntament's call. Level D is Bé d'Interès Documental. For A, B and C maintenance is compulsory and demolition is not possible; for D demolition is allowed once a historical and architectural study has been approved. The PIU also shows E1, E2 and E3 codes.
In practice, as the portal itself explains, licences for buildings at levels A, B, C or D, or inside a protected sector or ensemble, need a prior heritage report (informe previ de patrimoni), and some works become major works. Renovating a flat in a modernista block in the Eixample or replacing facade windows in Ciutat Vella can be harder than in an ordinary building. In Ciutat Vella the whole district has at least level D unless a building is individually listed as A, B or C.
The planning classification answers different questions: how many storeys and what building depth the plan allows, which uses are permitted, and whether the plot is earmarked for a road, green space or public facility. It matters if you want to add a floor, extend a house or change the use of a premises.
How to check it for free on the PIU
Open the Portal d'Informació Urbanística (ajuntament.barcelona.cat/informaciourbanistica). Type the address in the search box on the left or click the plot on the map. A drop-down lists the sections available, which vary by plot: plot identification, addresses, planning classifications, planning areas, licence suspensions, court rulings, architectural heritage and Municipal Archive files.
Listed plots appear on the map with a brown dotted hatch and the level letter in the middle. You can find the catalogue record by address, by ID number or by name. It describes the element and the interventions the protection plan allows. There is also a themed map showing only the heritage catalogue.
If your question is narrow, such as whether a flat can legally be a home, the PIU has a quick check called Afectacions de finques per a ús d'habitatge existent. You only need the street and number. A result of El planejament ADMET l'ús d'habitatge means the plan allows residential use on that plot. It only works for existing homes, though, and does not check the cèdula d'habitabilitat, whether the cadastre and licences match, or what works a listed building allows.
The Pla General Metropolità rules used to read the classification are published by the AMB.
How to order an official document
The procedure is called Informes i certificats de qualificació urbanística i plànols d'alineació. The three documents differ in who signs them and what they are for. The planning report is signed by a planning technician and is usually enough for sales of existing flats. The planning certificate is signed by the Ajuntament's secretary general and is worth getting for undeveloped plots or if you plan to extend a building. The alignment plan is also signed by a technician and is normally requested for a project, especially when the plot is affected by a road or another system such as green space.
Fees according to the procedure page in 2026: planning certificate 280 EUR, planning report 140 EUR, alignment plan 80 EUR.
How to apply: on the procedure page click to start, sign in with one of the accepted methods, fill in the form and confirm, sign it to file it in the Ajuntament's electronic registry and pay the fee generated. If you pay online, save the application and receipt as PDF and you are done. If not, print the self-assessment form and pay at one of the partner banks listed on the back; you do not need to bring the receipt to the Ajuntament.
After you apply: timing and delivery
Delivery takes one month in every case, counted from the date of registration and payment of the fee. A planning certificate is valid for six months from notification.
Watch the payment rules. For a planning certificate the file opens regardless, and if you have not paid the self-assessment within 15 days the Ajuntament issues its own bill. For the planning report and the alignment report nothing happens until you pay, and after 15 days without payment the request is treated as withdrawn.
Delivery. Those required to deal with the Ajuntament electronically (companies, professionals) receive it through electronic notification and must sign up to that service. Private individuals can choose electronic notification or post. If you ever need to collect it in person, bring your original DNI, NIE or passport, and if you act for someone else, a power of attorney or a signed authorisation with a copy of their ID.
If you would rather speak to someone, the urban information page lets you book a phone or in-person appointment with a technician from the Departament d'Informació i Documentació Urbanística, or send a basic question through Atenció en línia. Those answers are for guidance only.
Outside Barcelona
For Castelldefels, Sitges or any other Catalan town there is the Mapa urbanístic de Catalunya (MUC) from the Generalitat's territory department. Its viewer lets you search by municipality, address or cadastral reference, see the classification and jump to the Registre de planejament urbanístic de Catalunya, which holds the full texts of plans in force. It is a good first step, but the official answer about a plot and the local protection catalogue come from that town's Ajuntament, usually through its planning department or by requesting a planning report or cèdula urbanística.
For buildings of wider significance, the Inventari del Patrimoni Arquitectònic de Catalunya lists BCIN, BCIL and other buildings of interest. Being in the inventory does not by itself mean legal protection, so rely on the municipal catalogue and plan.
Common mistakes
Treating a PIU screenshot as an official document. The portal itself warns that its information has no legal force. For a sale or a project you need the report or the certificate.
Ordering the wrong document. For buying an ordinary flat the 140 EUR report is usually enough; the 280 EUR certificate makes sense in more complex cases such as a vacant plot or an extension.
Paying late. An unpaid report is treated as withdrawn after 15 days, and you start over.
Checking the flat but not the building. Protection covers the whole building, so limits on the facade, windows or balconies apply to you even if your flat's interior is unremarkable.
Rules and fees change, so check the current procedure page before ordering. If you would rather not deal with it, BCN YARD checks the building's status and handles the paperwork as part of the renovation.