Which procedure applies to a ruin, what changes from 1 October 2026, how IMT, VAT and the rehabilitation exemptions work for a non-resident, and what to ask the council before you sign.
Our guide to ruins and abandoned houses in Portugal covers where the ruins are and why undivided inheritance is the main risk. This article is the next step: once the title is clean, what does it take to get permission, what does the tax side look like for a non-resident, and what should the budget include besides the builder? Rules here changed during 2026, and several points below are still being interpreted, so we mark what you must confirm.
Step zero: ask the council before you buy
The câmara municipal is the authority for any work. Before you sign anything, you can ask it for a prior information request (informação prévia) about the specific building: what the municipal masterplan (PDM) allows, whether the old footprint can be rebuilt, whether the plot is in a protected or historic area. The answer is far more useful than any agent's promise. For land classified as rural or agricultural, rebuilding rights are often narrower than on an urban plot, and a ruin that is only partly standing may be treated differently from a house with a roof. We could not find a general rule for this, so treat it as a question to put in writing.
Which procedure applies
Portuguese law distinguishes three levels of control. Full licensing applies to the heaviest operations. A simplified prior communication (comunicação prévia) covers many ordinary works. Some interior works that do not touch structure, façades or shared services are exempt from prior control. For a ruin, expect structure, roof and façade work, so plan for licensing or prior communication, not exemption.
A new decree-law (DL 108/2026), which amends the urban development and building regime, was published in May 2026. Its entry into force was postponed, and according to law-firm and press summaries it applies from 1 October 2026; until 30 September the previous rules continue. As summarised by lawyers, the point for buyers is that under prior communication you can start works without waiting for a council decision once the file and fees are submitted, but you and your technician carry full legal responsibility for compliance. One summary adds that a reconstruction which increases volume or floor area is treated as an extension, which changes the procedure. Because these are secondary sources, ask your architect to confirm the procedure under the text in force on the day you file.
The architect and the project
In practice you need a licensed architect or engineer, since the project and the responsibility statements come from them. Published fee figures are scattered: a services marketplace gives an average of about EUR 5,500 for an architecture project, with a very wide range (EUR 550 to EUR 20,000); a forum post from the Algarve mentions EUR 6,000 to EUR 8,000 for a full house project; the architects' association argues that fees are roughly 1% to 1.9% of construction cost. These are indicative, not survey data. A typical payment schedule is by stages, from signing through preliminary study, licensing project, specialist projects and execution design to site support. Ask for a fixed fee and a stage schedule in writing.
Construction budget
Our earlier figures still hold as a base: roughly EUR 700 to EUR 900 per m² for a basic restoration and EUR 1,100 to EUR 1,600 per m² for a full rebuild from a ruin. Other published numbers are wider: a promotional range of EUR 1,000 to EUR 2,500 per m², and a Tavira builder quote of about EUR 1,300 per m² mentioned in a forum thread. Quotes in Portugal are often turnkey, so compare scope and finishes, not only the price. Get at least three itemised quotes, and add a contingency, because hidden structural problems usually appear after demolition.
Taxes: what a non-resident pays
IMT, the purchase tax, is charged at a flat 7.5% on residential property for most non-resident buyers since 25 May 2026 (Decree-Law 97/2026), with exceptions reported for buyers who become Portuguese tax residents within two years or who put the property into qualifying moderate-rent use. One source gives a slightly different start date, so confirm with the notary. Stamp duty is added.
Rehabilitation exemptions exist in the tax benefits statute: an IMT exemption on buying a building for rehabilitation, if works start within three years, and an IMI (annual property tax) exemption for five years after the works, renewable once. Both depend on the building's conservation level rising by two levels to at least good. We could not confirm whether a non-resident buying for rehabilitation keeps the IMT exemption under the new 7.5% rule, and the sources we found predate it. Get written confirmation from a tax adviser or the council's urban rehabilitation office before you rely on it.
VAT on the works
A reduced VAT rate of 6% applies to rehabilitation contracts in a legally defined urban rehabilitation area (ARU). Law 48/2026 of 17 August 2026 clarified that an approved rehabilitation operation (ORU) is no longer required, and the tax authority has applied this retroactively. However, according to a law-firm summary the authority may still refuse the reduced rate where the ARU is more than three years old and has no ORU, and that reading is contested. So ask the council whether the building lies in an ARU, the date of its delimitation, and have the contractor invoice the correct rate in writing.
Funding
We did not find a verified grant that a non-resident buyer of a rural ruin can count on. The energy-efficiency programme Casa Eficiente received 78,052 applications in a 2023 call, far above its budget, and we found no current terms. Read the latest call notice (aviso) before assuming support, and do not build the budget around it.
Sequence that avoids expensive mistakes
- Confirm all heirs and the registered title (see the earlier guide).
- Ask the câmara for prior information on the building and check ARU status.
- Get a structural survey and three itemised quotes.
- Confirm in writing the IMT treatment and the VAT rate with a tax adviser.
- Sign the purchase only after these answers; see also mortgages for foreigners and property prices and buying costs.
FAQ
Can I start works before I get a licence? Under prior communication you may start without waiting for a decision, but only once the file and fees are submitted, and you carry the responsibility; ask your architect. Is 6% VAT automatic for a ruin? No, it depends on the building being in a valid ARU and on the contract being a rehabilitation contract. Does the 7.5% IMT apply to me? Most likely yes as a non-resident, unless an exception applies; confirm before signing. Can I get a grant? We found none we could confirm for non-resident buyers. See also the investment risks in Portugal.
How we help
We help you ask the right questions of the council, find independent local architects and lawyers, and compare quotes in your language. This guide is informational only and not legal, tax or construction advice; rules changed in 2026, so verify the current text before you commit.