A bank appraiser may leave an unlicensed pool out of the valuation, and since the as-built dimensions often differ from the approved plan, a buyer can find a financing gap and a licensing question late in the purchase. A swimming pool is the most expensive feature most buyers never have checked, and in Portugal nobody is required to check it: there is no national safety law for private pools, no public body checks a pool's condition at sale, and since Decreto-Lei n.º 10/2024, de 8 de janeiro (DL 10/2024) the licence is no longer checked at the deed either, so the buyer and their lawyer have to find these questions before signing. An InspectOS pre-purchase inspection reads the pool alongside the rest of the property, recording the structure, waterproofing, plant-room safety and the physical signs of a licensing gap before you sign. It is part of the wider Algarve property inspection picture, where villa pools concentrate.
Table of Contents
- What does a swimming pool inspection check before you buy?
- Is the pool legal, and why does that matter to the bank?
- What are the structural and electrical risks in a villa pool?
- Why does Portugal have no private pool safety law?
- How a pool is assessed in a pre-purchase inspection
- Frequently Asked Questions
- Conclusion
What does a swimming pool inspection check before you buy?
A pool inspection checks the shell structure, the waterproofing, the plant-room electrical safety, and whether the pool's dimensions and existence match the approved plans.
A swimming pool inspection looks at four things, and only one of them is visible from the sun loungers. The first is the structure: cracks in the shell walls and floor that cause water loss and signal poor construction or ground movement. The second is the waterproofing: the membrane or lining that keeps the water in, which degrades under UV and thermal cycling. The third is the plant room (casa de máquinas), the small, often poorly ventilated space where the pumps, filters, and electrics live, and where most of the safety risk hides. The fourth is licensing, whether the pool legally exists in the form it is built.
A quick look stops at whether the pump runs and the water is clear. That misses the failures that cost real money: a cracked shell that leaks thousands of litres, a plant room with no residual current device on a circuit next to water, or a pool that is 20% larger than the plan the câmara approved. This is dedicated work, which is why it pairs with the Algarve property inspection where villa pools are most common, rather than being a line item on a generic checklist.
Is the pool legal, and why does that matter to the bank?
A pool requires prior notification (comunicação prévia) under the RJUE, and a bank may not value an unlicensed pool, which can leave a financing gap to cover in cash.
Pool construction in Portugal requires prior notification, comunicação prévia, to the câmara municipal under the Regime Jurídico da Urbanização e Edificação (RJUE, Decreto-Lei n.º 555/99). This is a simplified pathway, but it is mandatory, and the pool must appear in the property's registered description (descrição predial). When it does not, or when what was built differs from what was declared, the buyer needs to know before signing. An unlicensed pool the seller did not disclose may support a claim for a defective sale under Art. 913 of the Código Civil, but the buyer carries the burden of proof, and your lawyer should advise on your rights and any inspection condition before you commit.
The recurring issue is what local agents call the property that "engordou", got fat. The pool was built larger than the approved plan, or it exists where the stamped plans (plantas carimbadas) show no pool at all. A bank appraiser may leave the unlicensed part out of the valuation, which can cut what the bank will lend and leave the buyer to make up the difference in cash, or abandon the purchase.
What DL 10/2024 changed is the deed: from 1 January 2024 the notary no longer checks the licence there. It did not remove the licensing obligation, unlicensed works still face fines under RJUE Art. 98, and the câmara can still order legalisation or demolition. The full mechanics of that change sit in the Simplex Urbanístico guide, and the broader unlicensed-construction picture in the Algarve unlicensed construction guide. A structure in a RAN or REN protected zone may have no legalisation pathway at all.
What are the structural and electrical risks in a villa pool?
The most serious pool risks are structural cracks that leak, UV-degraded waterproofing, and plant rooms with no residual current device protecting electrics next to water.
Structural cracking is the costliest pool defect. Cracks in the walls of a pool usually trace back to poor ground preparation or an inadequate concrete or steel specification, the kind of failure that drains the pool and the repair budget together. Cracks that cause water loss the plumbing cannot explain are a structural finding, not a maintenance one, and they connect to the same reinforced-concrete corrosion that the structural and seismic inspection covers for the building.
The plant room is where the danger concentrates. These rooms are often small, semi-buried, and poorly ventilated, so chlorine vapours build up and corrode metal and electrical contacts, while leaks and condensation keep the space damp. The findings that matter most for safety are no residual current device (RCD) on the pool equipment circuits, exposed or water-damaged wiring, standard junction boxes where pool-rated fittings are required, and earthing deficiencies. Water and unprotected electrics in the same room is the single most safety-critical thing a pool inspection finds.
The waterproofing sits between the two. Bituminous membranes degrade under the Algarve's intense UV, becoming brittle and lifting at the edges, and tile or lining detachment follows. None of this shows when the pool is full and blue for a summer viewing, which is exactly why it needs an engineer rather than a glance.
Why does Portugal have no private pool safety law?
Portugal has no national safety law for private pools, unlike France's loi piscine, so safety devices and barriers are not legally required and are frequently absent.
Portugal is unusual in having no mandatory safety regime for private swimming pools: only pools in water-recreation venues have their own rules, as DECO, APSI and the pool professionals' association APP pointed out when they proposed one to Parliament in 2023. France's loi piscine requires every private in-ground pool to have one of a defined set of safety devices, a barrier, alarm, cover, or shelter. Portugal has no equivalent, so a private villa pool can legally have no barrier, no alarm, and no cover, and a buyer with young children inherits whatever the previous owner chose, which is often nothing.
The human cost is not abstract. Drowning-prevention bodies including APSI and emergency data from INEM identify pools as a primary location for child drowning, and the absence of a safety-device law means the only barrier is the one a buyer decides to install. A pool inspection records what safety provision exists so the buyer knows what is missing before, not after, completion.
How a pool is assessed in a pre-purchase inspection
The pool is assessed by an OE-registered engineer as part of an InspectOS Pre-Purchase Inspection, with a bilingual report within 48 hours of the visit, once the required documents are received.
The check is built to slot into a purchase. An engineer registered with the Ordem dos Engenheiros inspects the shell, the waterproofing, the plant room and its electrical safety, and the licensing signs, then delivers a bilingual report carrying the engineer's cédula within 48 hours of the visit, once the required documents are received. The pool is read inside a full pre-purchase inspection rather than beside it, because the questions a pool raises, ground movement, waterproofing failure and unlicensed structures, are the questions the rest of the property raises too.
What the report does not do is replace a lawyer. The inspection records the physical evidence, the as-built dimensions against the plans, the structures present but absent from the registered description, and recommends that the buyer confirm the legal status with the câmara municipal. The physical observation identifies the risk; the legal professional assesses the remedy.
Frequently Asked Questions
Is a swimming pool inspection necessary when buying in Portugal?
It is not legally required, but it is one of the highest-value checks for any property with a pool, because the pool is expensive to repair and can be unlicensed. A superficial walkthrough will not cover pool structure, plant-room electrical safety and licensing in depth. A pre-purchase inspection by an OE-registered engineer does, and the pool sits inside its scope.
What makes a pool "unlicensed" in Portugal?
A pool needs prior notification (comunicação prévia) to the câmara municipal under the RJUE and must appear in the property's registered description. A pool is effectively unlicensed when it was never notified, when it was built larger than the approved plan, or when it sits in a protected RAN or REN zone where it cannot be legalised. The inspection flags the physical signs; a lawyer confirms the legal status.
Does an unlicensed pool affect my mortgage?
It can. A bank appraiser may leave the unlicensed part out of the valuation, which lowers what the bank lends against and can leave a financing gap you must cover in cash. DL 10/2024 removed the licence check at the deed, not the licensing obligation: unlicensed works still face fines under RJUE Art. 98, and the câmara can still require legalisation or demolition, so find out before you sign.
What is the most dangerous thing a pool inspection finds?
The plant room electrics. Pumps and equipment running on circuits without a residual current device, in a damp room next to water, is the most safety-critical defect, because it creates a real electrocution risk. The inspection checks for RCD protection, the condition of wiring, the rating of fittings, and earthing, and flags anything that needs immediate work.
Does the inspection cover pool safety for children?
It records what safety provision exists, because Portugal has no law requiring it. There is no national mandate for barriers, alarms, or covers on private pools, unlike in France, so the inspection tells a buyer what is and is not in place. Drowning-prevention bodies such as APSI identify pools as a primary child-drowning location, which makes that record worth having before you buy.
Conclusion
A pool is the feature buyers most want and least check, and in Portugal that is a costly blind spot: no safety law requires anything, the licensing is frequently missing or mismatched, and a bank may not value an unlicensed pool. The câmara can still order legalisation or demolition, and DL 10/2024 removed the licence check at the deed, so the time to find out is before you sign. An InspectOS Pre-Purchase Inspection records the pool's structure, waterproofing, plant-room safety and the signs of a licensing gap before you sign, alongside the rest of the property. It costs a fraction of the legalisation or demolition an unlicensed pool can trigger.
→ Book a pre-purchase inspection · get a quote at inspectos.pt/en/home-inspections
Updated October 2026 | Reviewed by the InspectOS engineering team | InspectOS Portugal, Algarve coverage
Sources
- RJUE (Decreto-Lei n.º 555/99)
- Decreto-Lei n.º 10/2024, de 8 de janeiro
- France loi piscine (loi n.º 2003-9)
- APSI and INEM drowning-prevention data
- DECO, APSI and APP proposal for a pool safety regime (Postal do Algarve, 12 July and 25 August 2023)
- Código Civil, Art. 913
- Ordem dos Engenheiros