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DL 97/2017 · Artigo 14.º

Mandatory Gas Inspection: 5-Year Cycle & Non-Compliance Risks

Mandatory every 5 years by law. In the event of an accident with an expired certificate, insurance may not cover the damage. Learn how to comply and protect your family.

Maximum fine: €3,500 · Home insurance voided in the event of accident

Most insurers automatically void gas damage coverage when the inspection certificate is expired, regardless of the claim amount.

What DL 97/2017 Requires

Mandatory 5-year periodicity

Before

Voluntary inspection — no legally defined deadline

Now

Mandatory inspection every 5 years by DGEG-accredited technician

Certificate with legal validity

Before

No standardised certificate — informal proof

Now

Official certificate with mandatory DGEG registration number

Who Is Required to Comply

Owners

All owners of properties with gas installations (natural gas or propane/butane) are required to conduct the inspection every 5 years.

Landlords

The responsibility falls on the landlord, not the tenant. The certificate must be current regardless of the rental agreement.

Buyers

Before deed, verify the certificate is valid. If expired, negotiate the inspection as a condition of sale.

Common Risks and Issues

IssueFrequencyImpact
Expired certificate (>5 years)Very commonFine €250–€3,500 + insurance voided
Non-compliant pressure regulators20% of installations€300–€800 repair
Corroded or poorly supported piping25% in pre-1990 properties€500–€2,000 repair
Undetected gas leak — critical risk2–3% of inspectionsHospitalisation + property damage

Certified gas inspection companies (EIG)

Authorised by DGEG under Law 15/2015 to carry out inspections of gas networks and installations.

23 companies nationwide

Available in: AMADORA, BARCELOS, COIMBRA, FARO, LEIRIA, LISBOA, LOURES, LOUSADA, MAFRA, MAIA, MATOSINHOS, OEIRAS, PORTO, SEIXAL, SINTRA, VILA NOVA DE GAIA, VILA REAL, VISEU

Book a gas inspection

Gas Certificate with InspectOS

InspectOS works with DGEG-accredited technicians across Portugal. The inspection includes full installation check, tightness test, issuance of the official certificate with DGEG number and notification to home insurance upon request.

From €120
·
Certificate issued same day
Book Gas Inspection

Gas Compliance Checklist

  • Check the date of the last gas inspection (must not be more than 5 years old)
  • Confirm the technician holds a valid DGEG credential
  • Verify the gas installation appears in the property land registry
  • Confirm all combustion appliances work (boiler, hob, water heater)
  • Verify mandatory ventilation in rooms with gas appliances
  • Notify your home insurer of the renewed inspection certificate

Frequently Asked Questions

How often is a gas inspection required?
Portuguese law (DL 97/2017, Article 14) requires gas inspection every 5 years for all residential buildings with gas installations. The deadline runs from the last inspection conducted by a DGEG-accredited technician.
What happens if I don't get a gas inspection?
Fines between €250 and €3,500 for individuals. More seriously: in the event of a gas-related accident (leak, fire, explosion), home insurance may refuse to pay the indemnity if the certificate is expired. Full civil liability can fall on the property owner.
Who can perform a gas inspection?
Only technicians accredited by DGEG (Directorate-General for Energy and Geology). Do not accept certificates issued by technicians without a valid DGEG credential — they have no legal value. InspectOS works exclusively with technicians with an active DGEG credential.
Does the gas inspection cover gas cylinders?
Yes. The inspection covers natural gas grid connections, propane/butane cylinder installations, and LPG. The technician checks piping, pressure regulators, shut-off valves, combustion appliances and mandatory ventilation systems.
Can I sell a property without a gas safety certificate?
Technically the sale is not blocked by the absence of a gas certificate, but the liability for existing risks transfers to the buyer — who can pursue the seller if not informed. It is recommended practice to regularise the situation before sale to avoid subsequent disputes.

Related Services

Electrical InspectionBuilding InspectionHVAC Inspection

Sources: DL 97/2017 — Diário da República · DGEG (dgeg.gov.pt)