A bank appraiser assigns zero value to an unlicensed pool, and since the as-built dimensions so often differ from the approved plan, the new owner inherits both the liability and the financing gap. 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, and since Decreto-Lei n.º 10/2024, de 8 de janeiro (DL 10/2024) removed municipal verification at sale, the licensing and condition of the pool are the buyer's problem to discover. An InspectOS pre-purchase inspection reads the pool alongside the rest of the property, verifying the structure, waterproofing, plant-room safety, and licensing exposure 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
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.
Most buyers, and most general inspections, stop 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 assigns zero value to an unlicensed pool, leaving the buyer to cover the financing gap 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 problem becomes the buyer's. An undisclosed unlicensed pool is a hidden defect (defeito oculto) the buyer inherits at the escritura, and proving it after the fact falls under Art. 913 of the Código Civil.
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 assigns zero value to the unlicensed part, which cuts the loan-to-value the bank will lend against and forces the buyer to make up the difference in cash, or abandon the purchase.
The change that put this on the buyer is DL 10/2024. From 4 March 2024 it removed the fines (coimas) for unlicensed construction, but, and this is the trap, it did not remove the licensing obligation, and the câmara can still order legalisation or demolition. The full mechanics of that liability transfer 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. A documented Algarve case had cracks in every wall of the pool, traced to poor ground preparation and 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. Common findings are the ones that matter most for safety: 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. 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.
One figure circulates that buyers should treat with care. An industry discussion on Fórum da Casa claims that more than half of existing pools are illegal. That is an industry estimate, not an official statistic, and it should be read as a signal of scale rather than a measured number. The verified point stands without it: the licensing obligation is real, the enforcement risk is real, and the bank's zero valuation is real.
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 in 48 hours.
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. 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 frequently 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?
Yes. A bank appraiser assigns zero value to the unlicensed part, which lowers the valuation the bank lends against and can leave a financing gap you must cover in cash. Since DL 10/2024 removed the fines but kept the obligation, the câmara can still require legalisation or demolition, so the exposure is the buyer's after completion.
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 values an unlicensed pool at zero. Since DL 10/2024 the câmara can still order legalisation or demolition even with the fines gone, so the exposure lands on the buyer at completion. An InspectOS pre-purchase inspection verifies the pool's structure, waterproofing, plant-room safety and licensing 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 July 2026 | Reviewed by the InspectOS Engineering Team, Ordem dos Engenheiros licensed | 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
- Fórum da Casa industry discussion (illegal-pool prevalence, attributed as an industry claim, not an official statistic)
- InspectOS field findings
- Ordem dos Engenheiros