Catastro: descriptive and graphic certification, declaring building work (900D) and appealing

It is the official document from the Directorate General for the Cadastre that proves the physical, legal and economic data of a property (owner, surface area, use, cadastral value, cadastral reference) along with its graphic representation: the plot plan. It has the status of a public document (arts. 39 to 41 of the texto refundido de la Ley del Catastro Inmobiliario (recast text of the Real Estate Cadastre Act), RDLeg 1/2004).

It is requested for deeds of sale, inheritance and new building work, to register a property for the first time or to register its graphic representation in the Land Registry (arts. 199 and 205 of the Ley Hipotecaria (Mortgage Act), following Ley 13/2015 on Catastro-Registry coordination), for boundary demarcations and to check exactly what is recorded in the Catastro before selling or declaring building work.

Obtained online through the Catastro Electronic Office, it is free and issued instantly as a PDF with a secure verification code (CSV). The owner accesses it with a digital certificate or Cl@ve (the Spanish state electronic identification system); non-owners must prove a legitimate interest. Outside the online system (on paper, at the Management Office), you pay the cadastral accreditation tasa (official fee), the current amounts of which are shown in the table.

For registry use, it should be recent: the implementing regulations set a validity of 1 year from issuance provided there are no changes to the property. Managora obtains it for you, in the format required by the destination (registry, administrative or judicial), and delivers it ready to use; you can see the updated amount on the procedure page.

Art. 16.2 of the texto refundido de la Ley del Catastro (recast text of the Cadastre Act) makes it mandatory to declare the construction of new buildings and the extension, rehabilitation, renovation, demolition or tearing down of existing ones (mere conservation works are excluded), changes of use or destination, and segregations, divisions, aggregations and groupings. A swimming pool, a garage, 1 extra floor or a change from commercial premises to housing fall squarely into this category.

The deadline is 2 months counted from the day following the date of the event (usually, the completion of the building work). The cadastral owner declares using form 900D, approved by Orden HAC/1293/2018. Submission does not accrue any tasa (official fee): declaring is free; what costs money is not declaring.

Usual documentation: new building work deed if there is one, municipal licence or responsible declaration, project or final building certificate, plans of what has been built and photographs of the current state. Since the 2018 reform, you do not have to resubmit documents that are already in the possession of the Catastro, and electronic submission generates a receipt with a CSV.

If the town hall of your municipality is adhered to the communication procedure (art. 14 of the recast text), events with a municipal licence can reach the Catastro without the need for a declaration by the owner; it is advisable to check this before considering the building work regularised, because if the communication does not cover your case, the obligation to declare remains yours.

Failing to submit the 900D or doing so late is a simple tax infringement (arts. 70 and 71 of the recast text), punishable by a fine of €60 to €6,000. When the declaration is submitted with false, omitted or incomplete data, the penalty is quantified differently: from €6 to €60 for each omitted, falsified or incomplete piece of data, with the same cap of €6,000 (art. 71.1 of the recast text). Alternatively, the Catastro can incorporate the undeclared construction ex officio through the cadastral regularisation procedure, which accrues a regularisation tasa (official fee) of €60 per property and excludes the application of the penalty regime for the lack of declaration: you pay the fee or you are penalised, not both. Managora prepares and submits your 900D with the technical documentation properly assembled; the amount is on the procedure page.

The declaration incorporates the new construction into the cadastral description and the Catastro assigns a new cadastral value that includes it. The cadastral effects are backdated to the date of the declared event (art. 17 of the recast text), but in the IBI (local property tax) the alteration is noticed in the immediately subsequent accrual: the tax accrues on 1 January, so building work completed in 2026 is reflected in the 2027 bill (art. 75.3 of the texto refundido de la Ley de Haciendas Locales (recast text of the Local Tax Agencies Act)).

Declaring late avoids nothing: if the Catastro incorporates the building work ex officio years later, the town hall can settle the IBI for the non-prescribed financial years with the corrected value. Added to this is the regularisation tasa (official fee) of €60 per property if the incorporation is done through the cadastral regularisation procedure (which in that case excludes the penalty), or the fine for lack of declaration if the Catastro acts through the penalty route. Declaring on time only brings forward the inevitable and eliminates that risk.

The updated cadastral value also has repercussions in other areas: it serves as a base or reference for the plusvalía municipal (local land value tax) for the land portion, for income imputations in the IRPF (personal income tax) and in administrative checks. And having the Catastro in agreement with reality unlocks sales and inheritances, because the notario (civil law notary) and registrar require that what is in the deeds matches what is in the Catastro.

Against Catastro decisions (alteration of the description, new cadastral value, regularisation, changes of ownership, penalties) there are 2 mutually exclusive routes: the optional appeal for reconsideration before the Catastro Management Office that issued the act, or the economic-administrative claim before the Regional Economic-Administrative Tribunal. In both cases the deadline is 1 month from the day following the notification, and it cannot be extended: after 1 month, the act becomes final.

The appeal for reconsideration is resolved within 1 month; if there is no response, the silence is negative and the economic-administrative claim remains open (arts. 222 to 225 of the Ley General Tributaria (General Tax Act) and RD 520/2005). When the amount is very high (cadastral value over €1,800,000) the claim can go directly to the Central Economic-Administrative Tribunal.

Typical reasons that succeed: erroneous built surface area, incorrectly assigned use or category of the construction, incorrect age, wrong ownership and errors in valuation or application of the valuation report. Filing the appeal does not by itself suspend the effectiveness of the act or the bills that are issued: the suspension must be expressly requested and requires a guarantee (art. 224 LGT).

Managora studies your notification, drafts the appeal with legal reasoning, submits it on time to the Management Office and advises you on what evidence should be attached (plans, technical report, photographs). You can see the updated amount on the cadastral appeal for reconsideration procedure page.

It depends on the origin of the error. If the data is wrong for reasons beyond your control (the Catastro attributes more square metres to you than the real ones, a wrong use or a construction that does not exist), the route is the discrepancy correction procedure of art. 18 of the recast text: it is free, carries no penalty and can be initiated at any time by bringing the discrepancy to the attention of the Management Office with the corresponding evidence. The resolution issued is effective from the day following the one on which the Administration had documented proof of the discrepancy (art. 18.4 of the recast text), a date that can be earlier than the resolution itself.

If the mismatch is due to building work not being declared at the time, the correct route is not the correction but submitting the 900D even if it is past the deadline: voluntary regularisation brings the property into agreement, avoids the ex officio regularisation procedure with its €60 tasa (official fee) and leaves the file in the best possible position against a possible penalty.

For purely material, factual or arithmetic errors by the Catastro itself, there is also the rectification of errors provided for in art. 220 of the Ley General Tributaria (General Tax Act), which applies to tax management acts and can be initiated as long as the limitation period has not expired. Managora diagnoses which procedure corresponds to your case (correction, late declaration, rectification or appeal) and processes it from start to finish.

The reference value is not the cadastral value: it is the value that the Catastro publishes every year for each property and which since 2022 operates as the minimum taxable base for Property Transfer Tax and Inheritance and Gift Tax. The 2026 reference values were announced in the BOE on 16 December 2025 and can be consulted on the Catastro Electronic Office from 1 January 2026.

It is not appealed in the abstract: it is challenged when it produces tax effects. If you self-assessed ITP or ISD for the reference value and consider it higher than the real value, you can request the rectification of the self-assessment with a refund of undue income; if the Administration issues you a settlement, you can file an appeal for reconsideration or an economic-administrative claim. In both cases the Catastro issues a binding report that ratifies or corrects the value, and you can provide an expert appraisal of the property as evidence.

The contradictory expert appraisal itself (art. 57.2 LGT) is intended for value checks by the Administration, which today only come into play when there is no reference value or when a higher value is declared. The Catastro Office also has a specific channel to submit documents and written submissions (alegaciones) regarding the reference value of the property you own. Managora analyses whether it is worth challenging in your case and prepares the rectification or appeal.