Most overseas buyers looking at the western Algarve concentrate on the property and the price, and leave the paperwork to the lawyer. Two documents sit at the centre of that paperwork, and it helps to understand what each one actually proves before you commit to a home between Alvor and Sagres.
One is the caderneta predial, the tax register entry for the property. The other is the certidão permanente, the land registry certificate. They answer different questions, and a purchase is only as sound as the checks made against both. What follows is a general guide rather than legal advice, since the due diligence itself sits with your own lawyer.
The Caderneta Predial and What It Records
The caderneta predial is the property’s entry in the tax register held by the Portuguese Tax Authority. It identifies the property for tax purposes and carries the matrix reference, the artigo, that every Portuguese property is filed under. Your lawyer will pull a current copy early in the process.
It sets out the taxable value, the valor patrimonial tributário or VPT, which is the figure the annual IMI is calculated on rather than the price you actually pay. It also lists the registered owner, the location, the built and plot areas and the year of the last official valuation.
- The matrix article number that identifies the property in the tax system
- The taxable value, the VPT, used to work out the annual IMI bill
- The registered owner and the property’s location and areas
- The date of the last official valuation, which affects the VPT
Why the VPT Rarely Matches the Price
The VPT is an administrative figure and it usually sits well below the market price, particularly on older homes that have not been revalued for years. That gap matters, because a low VPT keeps the IMI down while the price you agree reflects what the market is doing on the day. A transaction can coincide with an assessment or update of the property’s VPT in circumstances provided for by the tax rules, so buyers should not assume that an existing VPT will remain unchanged indefinitely.
For a sense of scale, idealista price data put the Algarve regional median at around 3,139 Euros per square metre on 2025 figures published in 2026, and prime coastal spots around Lagos and Praia da Luz tend to run above that. The caderneta will not show those market numbers, so treat the VPT as a tax reference and read the price separately.
The Land Registry Certificate and What It Proves
The certidão permanente do registo predial is the document that proves who owns the property and what is registered against it. It is issued through the land registry, overseen by the Instituto dos Registos e do Notariado, and it can be pulled online with a subscription code that stays valid for a set period.
This is where any charge shows up. A mortgage, a lien, a right of way, a usufruct or a pending court action would all be recorded here, and a clean certificate close to completion is one of the main things your lawyer confirms before the deed is signed.
The certificate also carries the registry description of the property, the descrição predial, which sets out the boundaries and how the property is defined. On rural plots that description can be brief and dated, which is one reason a survey and a careful reading of the boundaries earn their place on older homes.
- The current registered owner and how they came to own the property
- Any mortgage or charge secured against the property
- Easements or rights of way that run with the land
- Any registered court action or attachment that could affect the sale
How the Two Documents Work Together
The caderneta and the certidão should describe the same property, and a mismatch between them is a reason to slow down rather than press on. Differences in the areas, the boundaries or the description can point to unregistered building work or an old clerical error that needs correcting before the deed.
Older rural properties in the far west, around Vila do Bispo and Sagres, are more likely to carry these discrepancies, since the paperwork can lag behind what was actually built on the ground. Our guide to property law in the Algarve sets out how these checks fit into the wider buying process.
Common Points Worth Checking
- That the seller named on the certidão is the person actually selling, and that any co-owners are accounted for
- That no mortgage or charge remains without an arrangement to discharge it at completion
- That the built area on the caderneta matches what you have viewed, since extensions are sometimes never registered
- That the description of the plot lines up with the boundaries you can see on site
None of this is unusual, and most sales in the western Algarve clear these checks without difficulty. The point is to have them done properly rather than assume the file is in order, because putting a problem right after the deed is far harder than catching it before.
Summary
The caderneta predial tells you how a property is taxed and what the authorities have on record, while the certidão permanente tells you who owns it and what is registered against it. Read together, and checked close to completion, they are the backbone of a safe purchase in the western Algarve.
If you are weighing up a home between Alvor and Sagres and want to see what is available, you can browse our current Algarve property for sale or speak to the B&P sales team about finding the right property. The legal due diligence sits with your own lawyer, and we are glad to work alongside them as your purchase moves ahead.
