Before buying or designing on a plot, three questions decide everything: what the law lets you build there, what stops it, and how much. This page explains, in plain language, the pieces a Trueplot dossier assembles to answer them — and where each one can be confirmed.
Portuguese land is governed by a chain of planning instruments. The Municipal Master Plan (PDM, Plano Diretor Municipal) covers the whole municipality and classifies and qualifies every piece of land; it is the plan that answers at most points. Below it, an Urbanisation Plan (PU) develops one area (a town centre, a waterfront) and a Detailed Plan (PP, Plano de Pormenor) goes almost to project level — alignments, heights, uses per parcel. Where a PU or PP is in force, its rules add to the PDM's and prevail in what they detail.
UOPG (Unidades Operativas de Planeamento e Gestão) are areas the PDM itself marks to be handled as a whole, with their own objectives, usually through a plan or an Execution Unit (UE) — an implementation agreement between the council and the owners. A UOPG is not, by itself, a buildability regime: it signals extra rules and steps before licensing.
These instruments are governed by the Legal Regime of Territorial Management Instruments (RJIGT), Decree-Law 80/2015 of 14 May, which also abolished the old operative category of "solo urbanizável" (land to be urbanised).
All land has a classification: urban (meant for urbanisation and building) or rustic (meant for agricultural, forestry or natural uses, with building allowed only under restricted conditions). Within each class the PDM qualifies land into categories — central, residential, economic-activity, green, agricultural, forest, natural spaces — and, in some municipalities, into subcategories with their own parameters.
The category (and subcategory, where it exists) is what says what can be done and how intensively: permitted uses, floor-area ratio, height, setbacks. Each category has one or more articles in the PDM regulation; the dossier always cites that article and, in the paid tier, shows its full text.
Category names are whatever each municipality chose — two municipalities can call the same kind of space different things. That is why Trueplot adds, next to the official name, one of the eight uses of its taxonomy (residential, central/mixed, economic activities, industry, tourism, facilities, green, agricultural/forest), stable across all municipalities.
Even on urban land, several public-utility restrictions can forbid or condition building. The National Ecological Reserve (REN) protects areas with ecological functions — flood beds, unstable slopes, headwaters, the coastal strip — and, as a rule, admits no new construction outside the listed exceptions (Decree-Law 166/2008). The National Agricultural Reserve (RAN) protects the best farmland and limits building to farm-related uses or authorised exceptions (Decree-Law 73/2009).
Administrative easements come from infrastructure and facilities: power lines, gas pipelines, roads and railways, airports (aeronautical easement), military installations, geodetic marks. Each has its own strip and regime, set in the act that creates it — the dossier cites it whenever the municipal source states it.
The public water domain (beds, banks and adjacent zones of rivers, lakes and the sea) subjects works to a water-use title (Law 54/2005 and Law 58/2005). Classified cultural heritage, or heritage in the process of classification, and its protection zones require the heritage authority's opinion and limit alterations (Law 107/2001). Beyond these families there are protected areas and Natura 2000 sites, hazards (flooding, wildfire, instability), and assorted protection strips.
A restriction does not "cancel" the PDM category: it adds to it. A residential plot with a REN strip may be buildable outside the REN and not inside it. That is why the dossier lists every restriction touching the point or parcel, each with its legal basis.
Planning parameters turn the category into numbers. The floor-area ratio (Iu, índice de utilização, also called índice de edificabilidade) is the ratio between the permitted gross floor area and the plot area — an Iu of 0.8 on a 1,000 m² plot allows up to 800 m² of floor area. The site-coverage ratio (Io) caps the building footprint relative to the plot. The cércea is the façade height measured from the ground to the eave; the number of storeys is what it says; setbacks (afastamentos) are the minimum distances to plot boundaries and neighbouring buildings.
The technical concepts these parameters use are standardised by Regulatory Decree 5/2019 of 27 September. Each PDM sets the values in its regulation, article by article, and some set them by reference to the surroundings (the "mode" of the frontage height, the street width) instead of by number — Porto is the best-known case.
Trueplot only shows a number when it was extracted from the article; when it was not, it writes "not extracted — see article" and keeps the reference. A gross floor-area estimate (Iu × area) is only computed when there is an official parcel area and a numeric ratio — and it is always indicative: it ignores height, setbacks, REN/RAN and the general building regulations (RGEU).
The Legal Regime of Urbanisation and Building (RJUE, Decree-Law 555/99, as amended, including by Decree-Law 10/2024) organises licensing. The prior information request (PIP, pedido de informação prévia) is the formal question to the council about the feasibility of an operation — a favourable answer binds the municipality for a period. Prior communication (comunicação prévia) is the lighter procedure, for operations fully compliant with the applicable plan and rules; the licence (licença) is the full procedure, with appraisal of the project.
A Trueplot dossier is reference information: it helps decide whether to proceed and what to ask. It does not replace the PIP, the land-registry certificate, or a consultation with the municipality — and the data of DGT's Land-Use Regime Map (CRUS) have the purpose DGT declares, which is not licensing.
Zoning comes from the CRUS (Directorate-General for Territory, DGT, CC BY 4.0) or, where the council publishes its own cartography, from the cited municipal service. Restrictions come from the municipal maps and from DGT's national charts (SRUP). Plan boundaries (PP/PU/UOPG) only enter with an official vector origin. Parcels and their areas come from the Digital Cadastral Map (SNIC/DGT, CC-BY 4.0) — never from collaborative maps.
Every municipality has a recorded legal chain: the act that approved the PDM, later amendments, corrections and suspensions, with links to the Diário da República. The dossier states the latest act incorporated in the data and whether a revision or amendment is in progress — a plan under revision may change the answer. The accuracy of the category → article link is measured by sampling (10 mappings per municipality, checked one by one) and the measured error rate is printed in the dossier; where it has not been measured yet, the dossier says so.
Reference text, not legal advice. Check the consolidated version of each act in the Diário da República. Trueplot, 2026-09-08.