Works without a permit are not always a dead end. Extensions, outbuildings, canopies, pools or changes of use carried out without a permit are common in Portugal’s building stock. In many cases, it is possible to legalise them — provided the planning framework allows.
Why legalisation matters
An unlegalised structure constrains financing, letting and sale, and exposes the owner to administrative offences and reinstatement orders. Regularising restores value and security to the property.
How to legalise
The route depends on the type of works and the applicable municipal plan: it may involve a legalisation request to the council, a prior notification or a licence, often with an architectural project and specialities demonstrating that the existing works conform. In some cases, it must be shown that the works comply with the rules in force — or those in force at the time of construction.
When it is not possible
If the construction breaches insurmountable constraints — for example, sitting within the National Ecological Reserve (REN), the National Agricultural Reserve (RAN) or the public domain, or exceeding the permitted development capacity — legalisation may not be viable, requiring correction or partial demolition. This is why prior analysis is decisive.
Before buying (or selling) a property with works, confirm legalisation
Confirming the planning status, identifying unlicensed works and assessing the feasibility of legalisation — case by case — protects both buyer and seller.
Do you have works to legalise, or are you buying a property in that situation? Paulo Silva Silva, Lawyer, assesses feasibility and handles the regularisation process with the council. Book a meeting or contact paulosilvasilva.adv@gmail.com · 916 055 901.
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New Land Law · Urban-planning licensing 2026 (new RJUE) · Urban planning lawyer in Sintra, Amadora and Loures
The information in this article is general and institutional in nature; it does not constitute legal advice and does not create a client relationship. The feasibility of legalisation depends on the specific framework; always confirm with the municipal council and in the version in force of the applicable statutes (dre.pt).