Portugal keeps a tight lid on detecting: Lei n.º 121/99 (metal detector act) bans using a metal detector to search for anything of historical, artistic, numismatic or archaeological interest, unless you hold a licence granted on scientific grounds. Hobby detecting is banned on the shore areas of the public maritime domain, whatever you look for, and any archaeological find must be reported within 48 hours.
Can I detect in Portugal?
The short answer for each kind of land. Tap a card for the detail and the rule’s own words.
- Anywhere: national heritage lawResearch permits onlythe law does not address hunting for modern lost itemsChecked against the source Oct 8, 2026
- Beaches & foreshoreProhibitedChecked against the source Oct 8, 2026
- Protected monumentsResearch permits onlythe detector and any finds can be forfeited (art. 6)Checked against the source Oct 8, 2026
- National parks & nature reservesResearch permits onlyChecked against the source Oct 8, 2026
- State forestsResearch permits onlyChecked against the source Oct 8, 2026
- Seas, rivers & lakesResearch permits onlyChecked against the source Oct 8, 2026
- Private landResearch permits onlyChecked against the source Oct 8, 2026
Open in many areas without a permitPermit, registration, or designated beaches onlyProhibited or effectively closed
The rules, land by land
Anywhere: national heritage law
Research permits onlyPortugal bans using a metal detector to search for objects of historical, artistic, numismatic or archaeological interest. The only way around it is a one-year licence from the government's heritage body, which weighs the applicant's scientific suitability. Coins count too: numismatics is named in the ban.
- the ban is in Lei n.º 121/99 (metal detector act), art. 1; coins count, since numismatics is named
- a licence is granted by the member of government for culture through the heritage protection body, according to the aims, the places to be surveyed and the applicant's scientific suitability; it lasts one year, and the application gives your identity, aim, places and detector specifications (art. 2)
- the framework heritage act, Lei n.º 107/2001, also makes detectors used for archaeological investigation depend on a prior licence (art. 75, n.º 6)
- breaking art. 1 is an administrative offense punished by a fine (amounts set in escudos in the 1999 text), negligence and attempts included; the detector and any archaeological, historic, artistic or numismatic finds can be forfeited (art. 5, art. 6)
- detector ads, and a document handed to every buyer, must reproduce the ban and its penalties (art. 3)
- the law does not address hunting for modern lost items
- hobby detecting is banned on the shore areas of the public maritime domain, whatever you look for (see beaches)
- rules specific to the Azores and Madeira autonomous regions were not checked
What the rule says
“É proibida a utilização de detectores de metais na pesquisa de objectos e artefactos relevantes para a história, para a arte, para a numismática ou para a arqueologia.”
Keeping finds
No verdict yetWho owns an archaeological find made on land in Portugal could not be confirmed from the laws we read. What is clear: a chance find of movable archaeological goods with commercial value earns the finder a reward, and finds made with an unlicensed detector can be forfeited.
- the discovery by chance of movable archaeological goods with commercial value gives the finder a right to a reward under the law (Lei n.º 107/2001, art. 78, n.º 2)
- goods recovered through archaeological works are national heritage (art. 74, n.º 3)
- gov.pt says a finder who does not declare the find loses the reward, in favor of the State
- finds made in breach of the detector ban can be forfeited along with the detector (Lei n.º 121/99, art. 6)
- underwater cultural heritage, including heritage goods washed ashore, belongs to the State when no owner is known (DL n.º 164/97, art. 1-2; see the underwater-heritage row)
- gov.pt calls movable and immovable archaeological goods national heritage (património nacional)
Reporting finds
Must be reportedAnyone who finds archaeological remains in Portugal, on public or private land or underwater, must report them within 48 hours to the heritage authority or the police.
- report within 48 hours to the competent heritage administration or a police authority, which secures the find and informs the heritage administration (Lei n.º 107/2001, art. 78, n.º 1)
- gov.pt says anyone can report, within 48 hours of the discovery, and that a find not declared loses the finder's reward in favor of the State
- underwater and shore finds can also be reported to customs or the maritime authority, within 48 hours (DL n.º 164/97, art. 12)
- destroying or damaging archaeological goods can be punished with up to three years in prison or a fine of up to 360 days (gov.pt)
What the rule says
“Quem encontrar, em terreno público ou particular, ou em meio submerso, quaisquer testemunhos arqueológicos fica obrigado a dar conhecimento do achado no prazo de quarenta e oito horas à administração do património cultural competente ou à autoridade policial”
Beaches & foreshore
ProhibitedUsing a metal detector is banned on Portugal's beaches and shore in the public maritime domain, whatever you look for: the underwater-heritage decree prohibits detectors on areas there that are permanently, temporarily or intermittently above water.
- the ban covers areas of the public maritime domain that are permanently, temporarily or intermittently above water, and every recognised underwater archaeological site in the official inventory and records (DL n.º 164/97, art. 8, n.º 2)
- the ban opens 'Sem prejuízo do estabelecido no número anterior' (without prejudice to the preceding paragraph), which refers to the heritage body's authorization for detecting archaeological goods in art. 8, n.º 1; the captures do not settle whether that authorization still opens these areas to archaeologists, but no hobby route exists
- the nationwide detector ban for historic objects applies too (Lei n.º 121/99, art. 1)
- underwater and washed-up heritage goods with no known owner belong to the State (see the underwater-heritage row)
What the rule says
“Sem prejuízo do estabelecido no número anterior, a utilização de detectores de metais é proibida na área de todos os sítios de valor arqueológico subaquático reconhecidos e constantes do inventário e dos registos do IPA, assim como nas áreas permanente, temporária ou intermitentemente emersas das zonas do domínio público marítimo.”
Keeping finds
ProhibitedUnderwater cultural heritage in Portugal, including goods washed ashore, belongs to the State when no owner is known. Report a chance find within 48 hours; if it is inventoried, the finder is paid half its value.
- covers movable or immovable goods with historical, artistic or scientific value in the territorial sea, rivers, lakes, lagoons, marshes and other waters listed in the decree, with their beds and banks, plus goods washed up (arrojados) (DL n.º 164/97, art. 1)
- goods not recovered by their owner within five years of losing them count as having no known owner (art. 2, n.º 2)
- collecting underwater heritage is allowed only in licensed underwater archaeological work (art. 7)
- report a chance find within 48 hours to customs, the local maritime authority, any police authority or the heritage body (art. 12)
- the finder is entitled to half the value of a chance find that is inventoried (art. 17, n.º 1)
What the rule says
“Os bens referidos no artigo anterior sem proprietário conhecido constituem propriedade do Estado.”
Protected monuments
Research permits onlyAt Portugal's classified monuments and archaeological sites, even using or carrying an unlicensed metal detector for searching is banned, on top of the nationwide ban on detecting for historic objects.
- Lei n.º 121/99 bans both using and transporting unlicensed detectors for searching at monuments and archaeological sites that are classified or being classified (art. 1, n.º 2)
- licences go only by aims, places and the applicant's scientific suitability (art. 2)
- the detector and any finds can be forfeited (art. 6)
What the rule says
“É igualmente proibida a utilização e o transporte de detectores de metais não licenciados para efeito de pesquisa em monumentos e sítios arqueológicos classificados ou em vias de classificação,”
National parks & nature reserves
Research permits onlyNo rule of its own turned up for national parks and nature reserves, so the national ban applies: in Portugal you may not use a metal detector to search for objects of historical, artistic, numismatic or archaeological interest without a licence tied to scientific suitability.
- no detector rule specific to national parks and nature reserves was found in the sources read
- Lei n.º 121/99 bans using metal detectors to search for objects relevant to history, art, numismatics or archaeology, anywhere in the country (art. 1)
- the only route is a one-year licence from the government's heritage body, granted according to the aims, the places to be surveyed and the applicant's scientific suitability (art. 2)
- the rule covers searching for historic, artistic, numismatic or archaeological objects; the law does not address hunting for modern lost items
What the rule says
“É proibida a utilização de detectores de metais na pesquisa de objectos e artefactos relevantes para a história, para a arte, para a numismática ou para a arqueologia.”
State forests
Research permits onlyNo rule of its own turned up for state forests, so the national ban applies: in Portugal you may not use a metal detector to search for objects of historical, artistic, numismatic or archaeological interest without a licence tied to scientific suitability.
- no detector rule specific to state forests was found in the sources read
- Lei n.º 121/99 bans using metal detectors to search for objects relevant to history, art, numismatics or archaeology, anywhere in the country (art. 1)
- the only route is a one-year licence from the government's heritage body, granted according to the aims, the places to be surveyed and the applicant's scientific suitability (art. 2)
- the rule covers searching for historic, artistic, numismatic or archaeological objects; the law does not address hunting for modern lost items
What the rule says
“É proibida a utilização de detectores de metais na pesquisa de objectos e artefactos relevantes para a história, para a arte, para a numismática ou para a arqueologia.”
Seas, rivers & lakes
Research permits onlySearching Portugal's seas, rivers and lakes for archaeological goods with a metal detector, magnetometer or sonar needs authorization, sought with a reasoned application that names the specialists involved.
- applies in the waters covered by the underwater-heritage decree, among them the territorial sea, rivers, lakes, lagoons and marshes, with their beds and banks (DL n.º 164/97, art. 1)
- the application must be reasoned and identify the specialists and organizations involved (art. 8, n.º 1)
- art. 8, n.º 2 bans using detectors at recognised underwater archaeological sites and on the shore areas of the public maritime domain
- the nationwide detector ban for historic objects applies too (Lei n.º 121/99, art. 1)
What the rule says
“A utilização de aparelhos de detecção aproximada ou remota, como sejam detectores de metais, magnetómetros, resistivímetros, sonares de varrimento lateral e de sísmica de reflexão e penetração, para fins de detecção de bens arqueológicos carece de autorização do IPA,”
Private land
Research permits onlyYour own field or a friend's farm is no loophole in Portugal: the national ban on detecting for historic, artistic, numismatic or archaeological objects applies on private land too, and only a licence tied to scientific suitability opens it.
- Lei n.º 107/2001 makes the reporting duty apply on public or private land alike (art. 78, n.º 1)
- Lei n.º 121/99 bans using metal detectors to search for objects relevant to history, art, numismatics or archaeology, anywhere in the country (art. 1)
- the only route is a one-year licence from the government's heritage body, granted according to the aims, the places to be surveyed and the applicant's scientific suitability (art. 2)
- the rule covers searching for historic, artistic, numismatic or archaeological objects; the law does not address hunting for modern lost items
What the rule says
“É proibida a utilização de detectores de metais na pesquisa de objectos e artefactos relevantes para a história, para a arte, para a numismática ou para a arqueologia.”
Even where detecting is allowed, archaeological and historic sites are protected, and you must fill every hole and follow posted rules. Always confirm the current rule with the land manager.
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Open data: every rule in our Portugal guide, with its quote, source and check date, free to reuse (CC BY-SA 4.0). Download the data →
A ban with a scientific door
Article 1 of Lei n.º 121/99 is short: using metal detectors to search for objects and artifacts relevant to history, art, numismatics or archaeology is prohibited. Coins count, since numismatics is named. The rule is about historic objects; the law doesn't address hunting for modern lost items.
The only way in is a one-year licence from the member of government for culture, through the heritage protection body, granted according to the aims, the places to be surveyed and the applicant's scientific suitability. The application gives your identity, your aim, the places and the detector's specifications. The framework heritage act, Lei n.º 107/2001, also makes detectors used for archaeological investigation depend on a prior licence.
Breaking the ban is an administrative offense punished by a fine, negligence and attempts included, and both the detector and any archaeological, historic, artistic or numismatic finds can be forfeited. The law even reaches the shop counter: detector ads, and a document given to every buyer, must reproduce the ban and its penalties.
Monuments, beaches and the water
At monuments and archaeological sites that are classified or being classified, even using or carrying an unlicensed detector for searching is banned.
On the coast, the underwater heritage decree (Decreto-Lei n.º 164/97) bans using metal detectors at recognised underwater archaeological sites and on areas of the public maritime domain that are permanently, temporarily or intermittently above water. That ban is worded 'without prejudice to' the decree's authorization for detecting archaeological goods, so whether authorized archaeologists may still work there is open; for hobbyists there is no route.
In the sea, rivers and lakes, using detectors, magnetometers or sonar to detect archaeological goods needs authorization, sought with a reasoned application that names the specialists involved. Underwater cultural heritage, including heritage goods washed ashore, belongs to the State when no owner is known. Report a chance find within 48 hours; if it is inventoried, the finder is paid half its value.
Found something? You have 48 hours
Anyone who finds archaeological remains, on public or private land or underwater, must report them within 48 hours to the heritage authority or the police, who secure the find and pass the report on. The gov.pt service page adds that a finder who doesn't declare a find loses the reward, in favor of the State.
Underwater and shore finds can also be reported to customs or the local maritime authority. Destroying or damaging archaeological goods can be punished with up to three years in prison or a fine.
Who owns a find on land?
That we could not confirm from the laws we read. What is clear: a chance find of movable archaeological goods with commercial value gives the finder a right to a reward under the law, goods recovered through archaeological works are national heritage, and finds made in breach of the detector ban can be forfeited along with the detector.
Sources
Official and statutory sources this page is based on (source check: October 8, 2026):
- Lei n.º 121/99, de 20 de Agosto: Utilização de detectores de metais (metal detector use act), Diário da República I Série-A n.º 194, p. 5527
- Lei n.º 107/2001, de 8 de Setembro: Lei de Bases do Património Cultural (cultural heritage framework act), Diário da República I Série-A n.º 209
- Decreto-Lei n.º 164/97, de 27 de Junho: património cultural subaquático (underwater cultural heritage decree), Diário da República I Série-A n.º 146, pp. 3140-3144
- Comunicar achado arqueológico (report an archaeological find)
- Legislação (arqueologia) (the agency site blocks automated checks; read it directly)
Once you’ve confirmed where you’re allowed to hunt, LuckyFind helps you make the most of it — track your route on the map, log each find with its location, and revisit your saved hunt records. LuckyFind does not verify land access or grant detecting permission. Free for iPhone and Android.
New to LuckyFind? Follow the first-hunt checklist, then learn how to record a hunt and add finds.
Frequently Asked Questions
- Is metal detecting legal in Portugal?
- Not to look for anything of historical, artistic, numismatic or archaeological interest without a licence, and licences go by the applicant's scientific suitability. The law doesn't address hunting for modern lost items.
- Can I metal detect on Portuguese beaches?
- No. The underwater heritage decree bans metal detectors on the shore areas of the public maritime domain, whatever you look for, and at recognised underwater sites.
- Can I detect on my own land in Portugal?
- The ban has no land-type limit, so it applies on private land too. Only a licence opens it.
- What do I do if I find something old?
- Report it within 48 hours to the heritage authority or the police. A chance find with commercial value can earn you a reward, which you lose if you don't declare it.
Find more, remember where
Download LuckyFind — free for iPhone and Android — to track your routes, log your finds, and keep your permitted spots organized.
