Porto PDM: the plan in force in 2026 and how to check your plot

The Plano Diretor Municipal (PDM) is the plan that zones all the land in a municipality; the general PDM guide explains how it works. In Porto, the plan in force is the 2nd revision, approved by the Assembleia Municipal (the municipal assembly) at an extraordinary session on May 31, 2021, with 21 votes in favor, 17 against and 8 abstentions. It was published as Aviso n.º 12773/2021 in Diário da República no. 131, 2nd series, on July 8, 2021, and took effect the next day (article 161 of the regulations). It replaced the 2006 PDM, which the Câmara Municipal (the city council) keeps in a separate viewer for reference.

The plan is made up of regulations, a planta de ordenamento (land-use map) with seven maps and a planta de condicionantes (constraints map) with two (article 2). Since 2021 it has been amended three times, and the 2025 adaptation republished the regulations in full; that is the updated version the council posts on its PDM page. The table sums up the history.

Aviso n.º 25098/2026/2 of October 12, 2026 announced that the Porto council decided, at its public meeting on September 29, 2026, to start the 2nd amendment of the PDM to allow the National Proton Therapy Center at IPO Porto (the Portuguese Oncology Institute) to go ahead. According to the terms of reference, the area covered is limited to what that project needs, next to IPO's current radiotherapy building. The procedure has 9 months to be completed and was exempted from environmental assessment.

Preliminary public input runs for 15 working days, from October 13 to November 2, 2026, through a form on the Portal do Munícipe. On the Plataforma Colaborativa de Gestão Territorial (PCGT) of the Direção-Geral do Território, the national planning authority, the procedure is at the monitoring stage, with no draft yet out for public consultation. Until it is approved and published, the amendment changes no rules, and outside that site the 2021 plan with the amendments in the table still applies.

When an amendment or revision goes out for public consultation, article 145 of the RJIGT (Regime Jurídico dos Instrumentos de Gestão Territorial, Portugal's planning instruments law) suspends PIPs, prior notifications and permit applications in the areas covered by the new rules until the plan takes effect; if it has not taken effect within 180 days, the suspension ends. Because this amendment is limited to one project, that effect is confined to its site. Before filing, check the council's PDM page for any new procedure.

The regulations classify the entire municipality as urban land, including the areas of the municipal ecological structure (article 9). So the rustic-land rules you will find in other PDMs do not apply in Porto: the question is not whether a plot is urban, but which category it is in and which maps cover it. A plot zoned as a protective green area or as Atlantic and riverside waterfront can have construction banned even though it is urban land.

The plan zones land in two ways (article 11). Operationally, it separates consolidated areas, where street patterns and building types are preserved, from areas under consolidation, which need deep restructuring, such as obsolete industrial zones or large, sparsely built plots. Functionally, it divides land into central areas, economic activity areas, green areas and Atlantic and riverside waterfront, low-density urban areas and special-use areas for facilities and infrastructure. The maps are read together and the most restrictive rule prevails (article 10); a plot only changes category through an amendment or revision of the PDM, an urbanization or detailed plan, or a simplified amendment (article 162).

The council publishes the plan in three places. The PDM site (pdm.cm-porto.pt), under Documentação, has the regulations in their updated 2025 version, the land-use and constraints maps as PDFs and the reports that accompany the plan. The Mapas do Porto portal (mapas.cm-porto.pt) has a page for the 2021 PDM, with the interactive map and the GeoPDM viewer. The easements and public-interest restrictions currently in force are on a dynamic constraints map, separate from the map published in July 2021.

The maps are reference tools: if they differ, the plan published in the Diário da República prevails. If you use the national SNIT geoportal run by the Direção-Geral do Território, check the date of the version you are viewing. The steps:

• Find the property on the 2021 PDM interactive map and make sure you are viewing the plan in force, not the 2006 PDM, which is still available in another viewer.
• Read the land qualification map to find the category and subcategory and whether the plot is in a consolidated area or one under consolidation.
• Open heritage maps I and II. They show buildings and ensembles of heritage value, historic cores and areas of known or potential archaeological value.
• Check the natural risks map in the version from the 2025 adaptation, along with the municipal ecological structure map.
• Check the constraints in force on the dynamic map of easements and public-interest restrictions.
• Get a location map. The Mapas do Porto portal has an app that issues topographic location maps, which the council describes as free and issued instantly.
• Open the regulations at the subcategory's article and also read the chapters on the environmental and heritage systems that apply to the property.

Read every map, not just the land qualification map. The table shows what to look for in each, with the articles of the regulations as republished in 2025.

Heritage carries a lot of weight in Porto. In buildings and ensembles of heritage value, conservation work is allowed and, where the building type permits, rehabilitation, alteration or extension; demolition is only allowed for safety, sanitation or public-interest reasons (article 90). In areas of known or potential archaeological value, if the work involves excavation or earthmoving, the council will say whether prior archaeological assessment or monitoring is needed (article 97).

In Porto, the rules depend mostly on the shape of the street. In historic areas and continuous street-front areas, the regulations set no ratio: new building follows the building lines, the prevailing building height and the rear building line of the street front, and back yards must stay permeable, with one outbuilding of up to 10 m² allowed as long as a permeability ratio of 0.3 is kept (articles 24 to 28). Numeric ratios apply to free-standing blocks, economic activity areas and low-density areas, and several can be changed within a UOPG (a planning and management unit). The guide how much can I build on my land explains the concepts.

The PDM also has financial rules. Each plot has an abstract building allowance, which in the Central Area is the greater of 1.0 m² per m² of plot or 1.7 m² per m² within 30 m of a serviced road; in the Western Area and Outer Arc, 0.6 and 1.0; in the Eastern Area, 0.2 and 0.35 (article 134). If a project exceeds that figure, the developer cedes land or pays the council compensation; if it falls short for planning reasons unrelated to the property, the council pays (article 135). In the inclusionary zoning area, new construction, extensions or changes of use from 1,500 m² of floor area must set aside a share for affordable housing for at least 25 years (article 142).

The 2021 PDM protects what already had a permit. Pre-existing situations include buildings and activities that needed no permit when the plan took effect and rights legally protected while they remain valid, such as permits, effective prior notifications, favorable PIPs and approved architectural designs (article 5). If they do not comply with the new plan, work is allowed that reduces the non-compliance or, without making it worse, improves the building's fit with its surroundings or its architectural quality, but not changes of use the category does not allow. A favorable PIP that is still valid counts as pre-existing; check the validity of the PIP.

For buildings without a permit, article 6 sets up a special legalization regime for what demonstrably existed in 1979; doubts are settled using the aerial survey of the city the council carried out that year. A favorable opinion requires the use to be compatible with the land-use category, the non-compliance not to cause unacceptable harm to its surroundings and the easements to be met. The process is explained in the guide on how building legalization works.

Fees are set in the Tabela de Taxas of the Código Regulamentar do Município do Porto (Annex G-1), in the version available on November 1, 2026. PDM extracts and topographic location maps ordered from the council carry low fees, and the Mapas do Porto portal issues location maps online at no cost. Check the amounts in the table in force before paying.

Reading the PDM gives you an interpretation; a decision on a pedido de informação prévia (PIP) gives you an answer that binds the council. Under the RJUE (Regime Jurídico da Urbanização e Edificação, Portugal's planning and building code) as revised by Decree-Law 108/2026, in force since October 1, 2026, a simple PIP confirms feasibility and constraints, and an extended PIP assesses the project in more detail. The council has up to 20 days for its initial check and then decides within 15 days (simple) or 30 days (extended; 45 for subdivisions); without a decision in time, the PIP is tacitly approved, and a favorable answer is valid for 2 years. The PIP guide explains the rules, and the guide to the PIP in Porto covers documents, filing on the Portal do Munícipe and costs.

In Porto, a PIP is worth it when:

• What you can build depends on the prevailing height, the most common height or the rear building line of the street front, and you need to know which height and depth the council will accept.
• The property is in a historic area, a historic core or a building or ensemble of heritage value, where demolition and extension have their own limits.
• The natural risks map shows flood risk or unstable slopes, or the property is on the coast.
• The project exceeds the plot's abstract building allowance, or sits in the inclusionary zoning area, and you want to know the compensation or affordable-housing share before investing.
• There is an old building without a permit and you need to know whether it fits the legalization regime in article 6.
• You are buying and want the promissory contract to depend on the answer: see PIP before buying land. Apto Group prepares and follows up your PIP in Porto.

The official sources are in Portuguese. Check the version in force before preparing a notice, project or application.

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