Keeping Chickens and Other Small Livestock in Portugal in 2026: A Practical Guide to the Three-CN Ceiling on Detenção Caseira, the 4.50 Euro Registration, the Flock Declaration Due by 30 September, and the Bird-Flu Rules That Can Confine Your Hens

Half the point of moving to rural Portugal, for a good number of people who do it, is the idea of a few hens at the bottom of the garden. The eggs are better, the kitchen scraps stop going in the bin, and nobody imagines paperwork. There is paperwork. Portuguese law has a specific category for keeping a small number of farm animals for your own use, it is called detenção caseira, it has a ceiling, a form, a fee and a registry, and September is one of the two months in the year when poultry keepers are required to tell the state how many birds they have.

This guide sets out where the line falls between a household flock and a livestock holding, what registering costs and involves, the declaration due by 30 September, the avian influenza rules that can confine your birds indoors, and what changes the moment you sell an egg to anyone outside your own family.

The legal category: detenção caseira

The framework is the Novo Regime do Exercício da Atividade Pecuária (New Regime for the Exercise of Livestock Activity), approved by Decreto-Lei n.º 81/2013 of 14 June and amended several times since, most recently by Decreto-Lei n.º 144/2026 of 17 July 2026.

Article 5 defines the household category by size. Detenção caseira applies only where the holding's installed capacity does not exceed 3 CN, and where no single livestock species exceeds 2 CN. CN stands for cabeça normal, the livestock unit used across European agricultural law to compare animals of different species by age, live weight and productive purpose. One adult horse is 1.00 CN. A laying hen is a very small fraction of one.

The DGAV describes the purpose test simply: the animals are held for the leisure or the supply of the holder and their family. There is one commercial exception, and it is narrow. Birds and rabbits may be sold at local producers' markets, within the limits set out in Annex I of the decree.

What 3 CN looks like in animals

The conversion table published by the regional agriculture services translates the abstract ceiling into countable animals. The practical reading of detenção caseira runs:

• Poultry: up to 100 birds
• Rabbits: up to 80
• Sheep or goats: up to 6
• Pigs: up to 4
• Cattle: 2
• Equines: 2

The underlying conversion values, for anyone doing the arithmetic on a mixed yard, put a broiler or guinea fowl at 0.006 CN, a laying hen at 0.013 CN, a duck or first-phase female turkey at 0.02 CN, a male turkey or goose at 0.03 CN and an ostrich at 0.20 CN. On the rabbit side, a breeding doe in lactation counts 0.04 CN and a rabbit being reared for meat 0.009 CN.

Two cautions. First, the 2 CN per-species cap binds before the 3 CN total does, so a yard with hens, rabbits and two goats hits its limits species by species rather than in aggregate. Second, the annexes were touched by the July 2026 amendment, so if your flock is anywhere near a threshold, confirm the current figures with the veterinary service covering your parish before you buy more birds.

What changed in July 2026

Decreto-Lei n.º 144/2026 of 17 July rewrote how installed capacity is measured, and the change matters most to people just over the household line. Capacity now corresponds to the maximum herd or flock authorised for the holding in a Plano de Produção (Production Plan) drawn up by the vet responsible for its health and validated by the DGAV. Previously the figure could be read off the theoretical capacity of the buildings, which meant a large old barn could push a modest holding into a higher class than its animals warranted. Licensing now follows the animals actually planned for, not the shed.

Registering a detenção caseira

Being under the ceiling does not mean being invisible. The DGAV operates a registration procedure for household holdings, and it is a short one.

• Where: the DAV or NAV, the veterinary service covering the location of the holding. Contact them first; they confirm what your particular case needs.
• The form: Modelo 1340/DGAV, the application for registration of detenção caseira.
• Prerequisite: an IB registration (Identificação de Beneficiário, Beneficiary Identification) with a valid IFAP number. IFAP is the agricultural payments agency, and its number is the key that opens most agricultural registries in Portugal, including this one.
• Land documents: either the IFAP parcel models iE and P3, or proof that you hold the land: the registo predial, the deed, or a lease contract.
• Personal documents: identification and tax documents, which vary depending on whether you register as an individual or through a company.
• The fee: 4.50 euros, paid by bank transfer to IBAN PT50 0781 0112 0000 0007 7849 6, with the reference "Registo de Detenção Caseira" and the regional service concerned. The charge rests on Despacho n.º 3044/2024 of 21 March 2024 and Despacho n.º 23298/2008 of 15 September.

Above the ceiling: class 3 and the fine that follows

Cross the household limits and you are carrying on a livestock activity, and the smallest of the three regulatory classes applies. Class 3 requires prior registration under Article 19, made on a form with the content set out in Annex III and accompanied by proof of the fee. For class 3 the fee is 20 percent of the base rate, and the base rate is 54 euros, renewed automatically each 1 March in line with mainland consumer price inflation excluding housing.

Running an unregistered class 3 holding is not a technicality. Article 46(1)(d) makes the installation or operation of a class 3 livestock holding without prior registration a serious economic contraordenação, punished under the Regime Jurídico das Contraordenações Económicas (Legal Regime for Economic Administrative Offences). Failing to update a registration when the declared details no longer describe the holding is a lighter offence under Article 46(2)(a), but still an offence.

There is also a trapdoor for household keepers. Article 5(2) allows the Director-General of Veterinary, faced with potential risks or exceptional health conditions, to order the compulsory census of household keepers as class 3 activity, by species or by region. In practice that is a disease-outbreak power, and poultry is the species it is most likely to be used on.

The September declaration

This is the obligation most new keepers do not know exists, and its window is open now. Poultry holders must periodically declare changes in their flocks. The declaration is made twice a year, in February and in September, by the last day of the month, and it reports the number of birds present on the 1st of that month. So the count that matters was taken on 1 September 2026, and the declaration is due by 30 September 2026.

It is filed through the AviDec online application, or in person at the DSAVR, the regional veterinary service. Access credentials for AviDec are requested from your regional service, which is worth doing before the last week of the month rather than during it. The obligation sits under Decreto-Lei n.º 142/2006 of 27 July and Despacho n.º 293/2015 of 12 January.

Beekeepers will recognise the pattern. Portugal runs the same September rhythm for hives, and our guide to keeping bees in Portugal covers the 1 to 30 September declaration of holdings and what missing it costs. If you keep both, you have two deadlines in the same month.

Bird flu, and the rules that can shut your hens indoors

Avian influenza is the reason the state wants to know where every backyard flock in the country is. Portugal's measures are issued as editais and avisos by the DGAV, and they are revised as the epidemiological picture moves.

The current framework is Edital n.º 49 of 10 April 2026, which replaced Edital n.º 48. It was issued in light of what the DGAV described as a favourable turn in the situation, so it is a relaxation rather than a tightening, but it keeps the essential obligations: reporting suspicion of disease, meeting biosecurity requirements, and complying with the rules that apply to fairs and markets selling live birds. Aviso n.º 21 of 19 December 2025 carries the annex that matters geographically, the list of municipalities and freguesias making up the high-risk zones, with the map.

Portugal's first confirmed case of 2026 came on 29 May, when H5N1 was detected in a yellow-legged gull collected at Gafanha da Nazaré, in Ílhavo. The seasonal risk runs the other way from the calendar you might expect: autumn and winter migration, not summer, is when wild birds bring the virus back, and it is in those months that the DGAV has historically imposed confinement, requiring birds in high-risk zones, household flocks included, to be kept in their housing so they cannot mix with wild birds. If you are buying point-of-lay pullets this month, build for the possibility that they may not be allowed outside later in the season.

The biosecurity basics that the editais require are unglamorous and effective: keep feed and water where wild birds cannot reach them, do not use surface water from a pond or stream as drinking water, keep new birds separate before introducing them, and report unexplained deaths rather than assuming a fox.

Selling eggs changes everything

Giving eggs to neighbours is one thing. Marketing them is another, and it moves you out of the household category entirely. Establishments with laying hens must be registered with the DGAV before starting up, under Article 6 of Decreto-Lei n.º 72-F/2003 of 14 April, by submitting a completed form to the DGAV unit covering the location.

Registration produces the producer code stamped on every egg sold for human consumption, and its structure is worth understanding because it is also how you read the eggs you buy:

• First digit, the production method: 0 for organic, 1 for free range, 2 for barn, 3 for cage
• Then PT, for Portugal
• Then a region digit: 1 and 2 for the North, 3 and 4 for the Centre, 5 for Lisboa e Vale do Tejo, 6 for the Alentejo, 7 for the Algarve, 8 for Madeira, 9 for the Azores
• Then a sequential number identifying the individual establishment

The narrow exception remains the one in the decree itself: birds and rabbits from a household holding may be sold at local producers' markets within the Annex I limits. Anything beyond that, including a regular stall or supplying a shop or restaurant, is a commercial operation with the registration to match.

Your neighbours and your câmara

National law sets the animal ceilings; the municipality and the civil code handle everything that happens at the boundary fence. Cockerels are the usual flashpoint, and they fall squarely inside the Regulamento Geral do Ruído (General Noise Regulation), with its protected night period from 23:00 to 07:00. Our guide to noise and neighbours in Portugal sets out how that regime works and how a complaint is actually made to stick.

Municipal posturas frequently add local conditions on distances from dwellings, wells and watercourses, on manure storage, and sometimes on keeping livestock inside urban perimeters at all. These are genuinely local, they are not published in any national database, and the only reliable way to find out is to ask your junta de freguesia or the câmara's environment department before you build the coop.

If your holding relies on its own water, a borehole is its own regulated matter, covered in our guide to sinking a water borehole. If the land itself is not yet properly registered, and a surprising amount of Portuguese rural land is not, our guide to registering rural land on BUPi covers a free window that also closes on 30 September.

What this means for foreign residents

• A dozen hens is well inside the household category, but it is still a registration. The 4.50 euro registo de detenção caseira is cheap, quick and done once. Skipping it is the sort of omission that surfaces at the worst moment, usually during a disease control operation.
• Get the IFAP number first. Almost nothing agricultural in Portugal proceeds without an IB registration and a valid IFAP number, and obtaining one is the slowest step in the process. Start there, not with the form.
• Diarise 30 September, every year, and 28 February. The poultry declaration is not sent to you as a reminder. It is your obligation to file, based on the birds present on the 1st of the month.
• One hundred birds is the ceiling, not a target. Cross it and you become a class 3 holding, with prior registration required and a serious economic offence waiting if you do not do it.
• Plan the coop for confinement. A run your birds cannot leave for weeks at a time is a bird-flu requirement waiting to happen in a high-risk zone. Building enough covered space now is cheaper than improvising it in December.
• The moment money changes hands, the rules change. Eggs for your own table and eggs for sale sit in different legal worlds. The producer registration and the stamped code are not optional for the second.
• Ask the junta before you build. The national ceilings are uniform across the country. The distances, the smells and the cockerel are local, and your neighbours will find the local rules faster than you will.

Portugal makes small-scale animal keeping genuinely easy by European standards: no licence, no inspection, a form and a coin. What it asks in return is that you are on the register and that you count your birds twice a year, so that when something arrives on the wind from a migrating flock, the veterinary service knows which gardens to knock on. That is not much to ask for eggs this good.