Simplex Urbanístico (Decreto-Lei 10/2024) eliminated mandatory municipal property verification at sale in Portugal from 1 January 2024, transferring 100% of liability for hidden defects, illegal construction, and missing certificates to the buyer. In 83% of properties inspected by InspectOS, certified engineers found at least one undisclosed defect — averaging €12,400 in hidden costs per transaction (InspectOS inspection data, 2024). This guide explains what changed, what risks you face as a buyer under Portuguese law, and why the Simplex Safe inspection (€450) is the only effective protection before signing your CPCV (promissory purchase contract).
Table of Contents
- What is Simplex Urbanístico and what did it change for property buyers?
- What checks did the Câmara Municipal stop doing before sale?
- Is the buyer responsible for illegal construction found after purchase?
- What is the difference between finding illegal works before and after the escritura?
- How much does it cost to legalise illegal construction in Portugal?
- What is the Simplex Safe inspection and what does it include?
- How do you protect your purchase with the right inspection before the CPCV?
- Frequently asked questions about Simplex Urbanístico for buyers
What is Simplex Urbanístico and what did it change for property buyers?
Simplex Urbanístico (Decreto-Lei n.º 10/2024, of 8 January) removed the licença de utilização (use/habitation licence) as a mandatory requirement for property sales in Portugal, shifting the burden of urban planning compliance verification from the municipality onto the buyer.
Before 1 January 2024, selling any urban property in Portugal required the seller to present the notary with a valid licença de utilização — the document confirming that the Câmara Municipal (municipal council) had inspected the property and verified it met current building and safety regulations. Without it, the escritura (deed of sale) could not proceed.
Decreto-Lei 10/2024 revoked that requirement. Article 19 of the decree now obliges the notary to inform the buyer that the property may lack urban planning titles — but the notary cannot refuse to execute the deed on those grounds. Verification went from mandatory to optional. Responsibility shifted from seller and municipality to buyer.
Simultaneously, the decree abolished the Ficha Técnica de Habitação (DL 68/2004, Art. 9) — the technical data sheet describing the building characteristics of properties constructed after 2004. Another layer of buyer protection, quietly removed.
What the decree did not change
The underlying legal framework remains fully intact. Urban planning regulations still apply. Illegal construction is still illegal. The sanctions under the RJUE (Regime Jurídico da Urbanização e Edificação, DL 555/99) — embargo, demolition orders, use cessation — remain fully enforceable. What changed is who bears those consequences. Before the sale, it was the seller. After the escritura, it is the buyer.
The paradigm shift is from prior control (the municipality verifies before sale) to subsequent control (the municipality may inspect after sale, but the new owner is liable). In practice, no public authority now stands between a buyer and a property's hidden problems.
What checks did the Câmara Municipal stop doing before sale?
Before Simplex Urbanístico, the Câmara Municipal verified up to 14 compliance categories as a condition for issuing the licença de utilização — every single one of those verifications is now the buyer's responsibility after the escritura.
The licença de utilização was not a bureaucratic formality. It was proof that a municipal officer had physically visited the property and confirmed compliance with a defined set of legal requirements. With DL 10/2024, that verification no longer happens. Here is what the municipality used to check — and what only an independent inspection can now confirm:
What the notary still does — and what they do not
Under DL 10/2024, the notary's role has been redefined. The notary must verbally inform the buyer that the property may lack títulos urbanísticos (urban planning titles). But this is an obligation of information, not verification. The notary does not inspect the property, does not consult the municipal archive, and does not check for unlicensed construction.
A buyer who signs the escritura without an independent inspection is acquiring a property whose compliance no public or private body has verified.
Is the buyer responsible for illegal construction found after purchase?
Yes. After the escritura, the buyer becomes the legal owner of the property and inherits all administrative and legal responsibilities attached to it — including illegal works carried out by previous owners, regardless of the buyer's knowledge.
This is the most critical aspect of Simplex Urbanístico for buyers. Liability for illegal construction does not extinguish with the sale. It transfers. When the Câmara Municipal identifies an illegal construction — an unlicensed extension, a basement converted to living space, a terrace enclosed without planning approval — the enforcement notice goes to the current owner, not to whoever built it.
What can happen after the escritura
The urban planning enforcement measures under RJUE, Arts. 102–106 include:
- Embargo (Art. 102): Immediate suspension of any use of the illegal construction
- Demolition order (Art. 106): Order to demolish unlicensed structures, at the owner's expense
- Use cessation (Art. 104): Prohibition on using the property or part of it
- Site restoration: Obligation to restore the land to its pre-infringement condition
Fines for administrative offences under the RJUE — such as occupying a building without a valid licença de utilização — range from €498.80 to €99,759.58 for individuals and up to €249,398.95 for legal entities (RJUE, Art. 98).
The ten-year nullity window
A frequently overlooked risk: the Câmara Municipal has up to ten years to identify and act on urban planning irregularities (legal analysis: Sérvulo & Associados, MATLAW). A property that appears completely regular today can face enforcement action — including embargo or demolition orders — a decade after acquisition.
The liability the buyer inherits is not only immediate. It is long-term.
What is the difference between finding illegal works before and after the escritura?
Finding illegal works before the escritura gives the buyer negotiating power or the right to withdraw without penalty; finding them after the escritura makes the buyer the sole party responsible for all legalisation or demolition costs.
The difference is not merely financial — it is legal and temporal.
Before the escritura: the buyer has a choice
If an independent inspection identifies illegal construction before signing the CPCV (Contrato-Promessa de Compra e Venda — the promissory purchase contract), the buyer has three options:
- Negotiate a price reduction corresponding to the estimated legalisation cost
- Require the seller to legalise the works as a condition of the sale
- Withdraw from the purchase without any financial penalty
If the inspection is conducted after the CPCV but before the escritura, the buyer may still invoke breach of contract conditions to recover the deposit doubled (sinal em dobro) — but only if the relevant protective clause was negotiated into the CPCV.
After the escritura: the buyer has no way out
Once the escritura pública de compra e venda is executed before a notary, ownership transfers in its entirety — including all encumbrances and liabilities. At that point:
- Illegal works are legally the buyer's problem
- The seller has no residual obligation (unless deliberate concealment can be proved, which is difficult)
- Legalisation costs — or demolition costs if legalisation is not viable — fall entirely on the buyer
InspectOS inspection data (2024) shows that 83% of properties contained at least one undisclosed defect. The average cost discovered after purchase is €12,400 per transaction. In cases involving larger unlicensed structures — an additional floor, a garage, or a substantial outbuilding — legalisation costs can reach €50,000 to €250,000.
How much does it cost to legalise illegal construction in Portugal?
Legalising illegal construction in Portugal costs between €5,000 and €250,000, depending on the scale, type, and location of the works — and some irregularities are legally impossible to regularise, in which case the Câmara Municipal can order demolition.
There is no fixed price for legalisation. The cost depends on multiple factors:
Factors that determine legalisation cost
Type of infraction:
- Enclosed balcony, marquise, or unlicensed outbuilding: €5,000–€50,000
- Change of use (basement or attic converted to habitable space without licence): €10,000–€80,000
- Additional floor construction: €30,000–€250,000
- Unapproved structural modification: €15,000–€150,000
Location:
- Properties in classified historic areas (Lisbon, Porto, Sintra) face additional restrictions that can render legalisation impossible
- Land within RAN (National Agricultural Reserve) or REN (National Ecological Reserve) carries specific limitations
Legalisation viability: The RJUE (DL 555/99) permits retrospective legalisation of existing works through a regularisation procedure — but only if the works comply with regulations in force at the time of the application, not at the time of construction. Works that violate the municipality's PDM (Plano Diretor Municipal) or current safety standards may be impossible to legalise, resulting in a mandatory demolition order.
What an inspection costs versus what not inspecting costs
The return on investment from a Simplex Safe inspection is, on average, 2,756% — calculated against the ratio between the inspection cost (€450) and the average hidden defect cost identified (€12,400).
What is the Simplex Safe inspection and what does it include?
The InspectOS Simplex Safe inspection is an in-person technical assessment by a certified Civil Engineer (Ordem dos Engenheiros), specifically designed to cover the risks created by DL 10/2024 — verifying the 47 categories the Câmara Municipal stopped confirming before sale.
The Simplex Safe inspection is not a superficial visual walkthrough. It is a systematic technical assessment conducted by a credentialled professional, using diagnostic equipment, producing a bilingual (PT/EN) report within 48 hours of the visit.
What the engineer verifies across 47 checkpoints
Urban planning compliance:
- Cross-referencing the Caderneta Predial (property tax record) against the physical reality of the property
- Identifying extensions, rooms, or alterations not registered in the land registry (Registo Predial)
- Preliminary assessment of PDM conformity for the relevant municipality
Structure and safety:
- Visual inspection for cracks, damp, structural deformation
- Assessment of roof, floor slabs, and load-bearing walls
- Identification of foundation settlement signs
Installations and certificates:
- Verification of valid gas inspection certificate (DL 97/2017)
- Verification of valid energy performance certificate / EPC (DL 101-D/2020)
- Visual inspection of electrical and plumbing installations
Documentation:
- Cross-referencing the Certidão de Teor do Registo Predial against the physical property
- Identification of registered charges, mortgages, and restrictions
- Flagging discrepancies between the registered description and physical reality
What the report includes
The InspectOS report, delivered within 48 hours, includes:
- Status classification for each checkpoint (Compliant / Non-Compliant / Requires Attention)
- Photographic documentation of every anomaly identified
- Estimated remediation cost per anomaly
- Negotiation recommendation based on the findings
- Executive summary in both Portuguese and English
- List of missing certificates with renewal deadlines
Price and availability
Simplex Safe: €450 — available in Lisbon, Porto, Algarve, Cascais, Sintra, Setúbal, Braga, Coimbra, and all other mainland municipalities. Online booking with confirmation within 24 hours. Inspections are available within 3–7 business days. The optimal timing is after an accepted offer and before CPCV signature — the window in which you have maximum protection and maximum negotiating power.
Don't sign the CPCV without knowing the property's true cost. The Simplex Safe inspection (€450) identifies illegal construction, structural defects, and missing certificates before any legal commitment. Your bilingual report arrives within 48 hours. If we find nothing, you buy with confidence. If we find problems, you negotiate from strength.
→ Book your Simplex Safe inspection — €450 | Choose your date
How do you protect your purchase with the right inspection before the CPCV?
The ideal protection window for a buyer is the period between an accepted offer and CPCV signature — an inspection conducted in that 7–14 day interval allows price negotiation, demands for remediation, or penalty-free withdrawal from the purchase.
The optimal protection sequence for a property purchase in Portugal in 2026 is as follows:
Phase 1: Before any commitment (week 1)
Before making an offer, the buyer should:
- Request the Caderneta Predial and Certidão de Teor do Registo Predial from the seller
- Verify whether a valid energy certificate exists (ADENE registry)
- Verify whether a valid gas inspection certificate exists (DGEG registry), where applicable
- Request a copy of the approved architectural project from the municipality
These documents do not replace a physical inspection — but they allow early identification of discrepancies before committing to a property.
Phase 2: After accepted offer — before CPCV (weeks 1–2)
This is the ideal moment for the Simplex Safe inspection. At this stage:
- No financial commitment has been made (the deposit has not yet been handed over)
- The buyer has complete freedom to withdraw without costs
- Inspection findings form the basis for negotiating the final price or the CPCV terms
An increasingly common practice is including a suspensive condition clause in the CPCV, tying the escritura to the absence of serious irregularities discovered in the inspection — protecting the buyer even when the inspection is scheduled after CPCV signature.
Phase 3: After CPCV — before escritura (weeks 2–8)
If timing requires the inspection after the CPCV, the buyer should ensure the contract explicitly addresses:
- What happens if illegal construction is found
- Who bears the legalisation costs for any identified irregularities
- The right to withdraw with the deposit returned double (sinal em dobro) in cases of serious irregularities
Without those clauses, a buyer who discovers illegal works after signing the CPCV faces legally limited and potentially costly options.
When to add a structural inspection
For properties built before 1983 — when Portugal's first seismic code (RSA, DL 235/83) was introduced — we recommend combining the Simplex Safe with the Structural and Seismic inspection (€850). Pre-1983 buildings in Lisbon were largely constructed with zero seismic design provisions, making structural assessment an essential addition to the compliance check. The Complete Bundle (€2,040) covers all five services in a single visit, saving €830 against individual bookings.
Frequently asked questions about Simplex Urbanístico for buyers
What is Simplex Urbanístico in plain terms?
Simplex Urbanístico (DL 10/2024) is a package of regulatory reforms to Portugal's construction and property sale process, in force from 1 January 2024. Its most significant impact for buyers is eliminating the licença de utilização as a mandatory sale requirement — shifting responsibility for any property irregularities from the seller and the municipality to the buyer after the escritura.
Was the licença de utilização completely abolished?
No. The licença de utilização still exists and is still issued by municipal councils. What DL 10/2024 abolished is the obligation to present it at the time of the escritura. A property can now be sold without a valid use licence — and the buyer inherits all consequences of that absence, including legalisation costs of €5,000–€250,000.
Doesn't the notary protect the buyer?
The notary is now legally required to inform the buyer that the property may lack urban planning titles (DL 10/2024, Art. 19). But the notary cannot refuse the escritura on those grounds and does not physically inspect the property. The protection offered is one of information, not of technical verification — an independent inspection is the only way to confirm the property's actual compliance.
Can I hold the seller responsible for illegal works they didn't disclose?
In principle, a buyer can attempt to prove dolo omissivo — deliberate concealment — if the seller knew about irregularities and hid them. In practice, this proof is difficult, and Portuguese property litigation is slow and expensive. The most effective protection is an inspection before the escritura — preventing the problem rather than trying to resolve it after the fact, with average post-purchase costs of €12,400.
When should I book the inspection — before or after the CPCV?
The optimal window is between the accepted offer and the CPCV signature. At that stage, no financial commitment has been made and the buyer can withdraw without penalty. Inspection findings provide direct negotiating leverage on price or contract conditions. The InspectOS Simplex Safe (€450) can be booked online in 24 hours, with inspections typically available within 3–7 business days.
Is the Simplex Safe inspection enough for every property?
For most properties, the Simplex Safe (€450) provides the right level of protection. For buildings constructed before 1983, where seismic and structural risk is elevated, we recommend combining it with the Structural and Seismic inspection (€850). For properties requiring energy renovation, the Renovation Passport (€1,250) is the natural next step. The Complete Bundle (€2,040) combines all five services in one visit, saving €830.
What if the inspector finds nothing wrong?
A clean report is itself a valuable asset. It confirms the property is compliant and allows the buyer to proceed to the escritura without uncertainty. On a transaction of €300,000–€500,000 — the average price for an apartment in Lisbon or Porto — €450 for technical certainty is the lowest-risk investment in the entire purchase process.
Conclusion: Simplex Urbanístico created a risk that only an inspection eliminates
Simplex Urbanístico (DL 10/2024) did not remove the irregularities from Portuguese properties. It removed the mechanism that identified them before sale. Illegal construction still exists — InspectOS engineers found at least one undisclosed defect in 83% of properties assessed (InspectOS inspection data, 2024). Legalisation costs remain real — €5,000 to €250,000 under RJUE Arts. 98–106. Certificate fines are still enforced — up to €3,740 for a missing energy certificate (DL 101-D/2020, Art. 35) and up to €3,500 for a missing gas inspection (DL 97/2017, Art. 29).
What changed from 1 January 2024 is that these liabilities now fall on the buyer — not the seller, not the municipal council.
The InspectOS Simplex Safe inspection (€450) is the only way to verify, before any legal commitment, whether the property you are considering actually matches what the seller is presenting. An Ordem dos Engenheiros–certified engineer visits in person, verifies 47 checkpoints, and delivers a bilingual report within 48 hours — with cost estimates for every anomaly and negotiation recommendations.
With an inspection, you buy with certainty. Without one, you face an average of €12,400 in hidden costs that most Portuguese buyers discover far too late.
→ Book your Simplex Safe inspection — €450 | Available across mainland Portugal | Choose your date
Updated February 2026 | Reviewed by a certified Civil Engineer, Ordem dos Engenheiros | InspectOS Portugal
Sources: Decreto-Lei n.º 10/2024, of 8 January (Diário da República); RJUE — DL 555/99, of 16 December; DL 97/2017, of 10 August; DL 101-D/2020 (energy certification); InspectOS inspection data, 2024; Sérvulo & Associados, DL 10/2024 legal analysis; MATLAW, urban planning analysis 2024.