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AltUrb

Glossary

Brussels permits have a vocabulary of their own, most of it from administrative procedure rather than everyday language. This page explains the terms that appear on this site: the stages of a case, the kinds of permit, and the few notions we add ourselves. For the exact legal meaning of a term, the Brussels planning code and the relevant administration remain the reference.

The stages of a case

Permit application
The filing of the case with the commune or the region. Its date is when the project becomes publicly known; on this site that is the reception date or, failing that, the sending date.
Acknowledgement of a complete file
The act by which the administration records that the file holds every required document. That, and not the filing, starts the review clock. An acknowledgement of an incomplete file interrupts the process until the missing pieces arrive.
Special publicity measures
The regime triggered when a project departs from a rule or passes certain thresholds. It leads to a public inquiry and, usually, to the consultation committee.
Public inquiry
The period during which the file can be consulted and anyone may submit observations. It is announced by red notices on site, and its length is set by the applicable procedure.
Consultation committee
The body bringing together the commune, the region and, depending on the project, other administrations. It sits in public, hears the applicant and the objectors, and issues an opinion. That opinion informs the decision without replacing it.
Review period
The time the authority has to decide once the file is complete. It varies by procedure and can be suspended, for instance while an opinion is awaited. The durations we publish are measured on cases that were actually decided.
Decision
The grant or refusal of the permit, notified to the applicant. A case can also be withdrawn by the applicant, cancelled, or taken over by the delegated official.
Planning charges
Contributions, in money or in kind, imposed on projects above a certain size: housing, facilities, public space. A missing amount does not mean there are none.
Lapse
The expiry of a permit whose works have not started, or not been finished, within the period set by the rules. Validity dates published by the source are sometimes plainly wrong and are then neutralised.

The kinds of case

Planning permit (PU)
The authorisation required to build, transform, change the use of a property, fell trees or alter the external appearance. It is in principle granted by the communal college.
Permit granted by the delegated official (PFD)
A case reviewed and decided by the region's delegated official rather than by the commune, notably for public projects or projects of regional interest.
Referral to the delegated official (SFD)
If the commune does not decide within the deadline, the applicant may refer the case to the delegated official. The communal case then carries the label “Saisi par FD” and a new case appears at the same address. This site links the two.
Modification permit
A permit that modifies an already granted one. Its description usually cites the parent permit's reference, which we use to link the two cases.
Regularisation
An application covering works already carried out without a permit, or not in line with the permit obtained.
Environmental permit
The authorisation to operate an installation, classified by the nuisance it may cause: classes 1A and 1B, the heaviest, sit with Bruxelles Environnement; class 2 with the commune; class 3 is a simple declaration.
Mixed case
A project needing both a planning and an environmental permit. The two cases are linked and reviewed in parallel; this site shows them as one project.
Urban-planning information (RU)
The document describing the planning situation of a property: its use, the permits granted, any infringements. It is requested almost systematically before a sale, which is why we never show it at address level.
Communal authorisation (AC)
A communal register that is not a permit register: information requests, complaints, alleged infringements. These cases almost never receive a decision and are excluded from every statistic on this site.

The official sub-type and status labels shown on each page come straight from the source, in both national languages, and are never re-translated by us.

This site's own vocabulary

Work type
Our classification of the description into 21 categories — new build, extension, change of use, façade, roof and so on. It is produced automatically and carries no administrative weight.
Net m²
The area actually added or removed per use: authorised area, or projected when there is none, minus the existing area. The surfaces published by the source are totals after the works, not the size of the job.
Case outcome
Our normalised reading of the status: granted, refused, withdrawn, transferred, lapsed or pending. It is derived from the status label first and the status code second, because the code alone conflates several situations.
Observed event
A change we saw between two nightly loads. We know its date to within a day.
Reconstructed event
A step inferred from the case's date fields, for what happened before we were watching that case. The date is the one published by the source.
Reason code
The explanation shown in place of a missing value: absent from the source, not declared, not applicable to this kind of case, implausible, or an unusable description.

Abbreviations

AbbreviationMeaning
PUPermis d'urbanisme — planning permit
PFDPermit granted by the delegated official
SFDReferral to the delegated official
ACCommunal authorisation
RUUrban-planning information
FDFonctionnaire délégué — the delegated official
CoBAT / BWROThe Brussels planning code
PRAS / GBPThe regional land-use plan

Updated on 13 September 2026