Standard NBN D 51-003 – CERGA Accredited Body
Natural gas inspection for installations ≤ 70 kW
Have your natural gas installation inspected by an accredited body. Compliance certificate recognised for meter opening and commissioning.
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What is a natural gas inspection?
The natural gas inspection is a mandatory check of your indoor gas installation. It ensures that your pipework, connections and gas appliances comply with Belgian safety standards.
This inspection is carried out according to the standard NBN D 51-003, which governs indoor installations supplied with natural gas. For central heating boilers under 70 kW, the technical document NBN/DTD B 61-002:2021 specifies the requirements concerning air supply and flue gas evacuation.
This inspection concerns you if:
• You are connected to the natural gas grid
• The total power of your appliances is ≤ 70 kW
• You live in a house, apartment or small building
• You are connected to the natural gas grid
• The total power of your appliances is ≤ 70 kW
• You live in a house, apartment or small building
Individual houses
Boiler, water heater, gas cooker
Apartments
Individual installation in multi-unit building
New installation
Before first commissioning
Meter opening
Certificate required by the DSO
When is the natural gas inspection mandatory?
Belgian regulations require a compliance inspection in several situations. Here are the most common cases where you need to call an accredited body.
New installation
Every new natural gas connection must be inspected before commissioning. The compliance certificate is essential for the Distribution System Operator to open the meter.
Meter opening
When moving into a property where the gas meter has been closed, you must present a valid compliance certificate to obtain reconnection.
Major modification
Any significant change to the installation (adding an appliance, modifying pipework, replacing a boiler) requires a new compliance inspection.
At the request of the DSO
The Distribution System Operator (Ores, Sibelga, Fluvius, Resa) may require an inspection if there is doubt about the installation’s compliance or during a meter reading.
Good to know
Without a valid gas compliance certificate, your Distribution System Operator (DSO) will not be able to open your meter. Schedule your inspection in advance to avoid any delay in your move-in or commissioning.
What does the inspector check during the inspection?
Our accredited inspector carries out a methodical check of your entire installation, in accordance with current Belgian standards.
Reference standards for natural gas inspection ≤ 70 kW
NBN D 51-003:2010+A2:2021
Main standard for indoor installations supplied with natural gas. It applies to pipework downstream of the meter (pressure ≤ 100 mbar, diameter ≤ DN 50) and to all natural gas appliances.
NBN/DTD B 61-002:2021
Technical document for central heating boilers < 70 kW. Defines requirements for the installation space, combustion air supply and evacuation of combustion products.
How does the inspection work?
A simple and transparent process, from booking to obtaining your certificate.
01
Book online or by phone
Choose your slot from our availability. Appointment possible within 48h throughout Belgium.
02
Prepare for the visit
Ensure the gas meter is accessible and that appliances can be switched on for the test.
03
On-site inspection (30-60 min)
The inspector checks tightness, connections, ventilation and flue gas evacuation.
04
Report issued
You immediately receive your compliance certificate or details of points to correct.
Compliant installation
You receive your official compliance certificate. This document is recognised by all Distribution System Operators and allows you to obtain meter opening.
✓ Certificate issued immediately
✓ Official document recognised by DSOs
✓ Usable for meter opening
Non-compliance points
The inspector clearly explains the corrections to be made. After work by a qualified installer, we return for a re-inspection.
→ Detailed report of faults
→ Advice for bringing into compliance
→ Re-inspection at reduced rate
Digital & instant meter opening
Elgacert: the 100% digital gas certificate
Since 2024, only digital documents via the Elgacert platform (Electronic Gas Certificates) are accepted by Distribution System Operators (DSOs) for opening the natural gas meter. No more paper certificates!
What is Elgacert?
Elgacert is the digital platform launched by Gas.be in collaboration with the 4 Belgian DSOs (Ores, Sibelga, Fluvius, Resa). It allows compliance certificates to be created, archived and automatically transmitted securely.
Certinergie × Elgacert: instant opening
Our tools are directly connected to the Elgacert platform. This means that if your installation is compliant and everything is properly prepared in advance:
⚡ Your gas meter opening can be triggered instantly after our inspection
No more waiting days to receive a paper certificate and then forward it to the DSO. The inspection report is generated and transmitted digitally in real time.
How does the Elgacert process work?
The installer creates the certificate
Your CERGA-accredited installer creates the compliance certificate on Elgacert and signs it via itsme®.
Certinergie carries out the inspection
Our inspector checks the installation and validates the inspection report directly on Elgacert.
Automatic transmission to the DSO
The certificate and report are automatically sent to the Distribution System Operator (Ores, Sibelga, Fluvius, Resa).
Meter opening
The DSO receives the documents instantly and can proceed with opening your gas meter.
What you need to prepare for a fast opening
For meter opening to be instant after our inspection, ensure these items are in order before our visit:
Gas EAN code
The EAN code (18 digits) of your gas meter, shown on your bill or energy contract.
Installer’s certificate
The accredited installer (CERGA) must have created their compliance certificate on Elgacert BEFORE our visit.
Access to meter and appliances
The gas meter must be accessible and all gas appliances must be able to be switched on for the test.
Certinergie tip: Contact your installer to make sure they have created the compliance certificate on Elgacert before our inspection visit. This is the #1 condition for a delay-free meter opening.
Natural gas inspection prices
Transparent and competitive prices for your gas compliance inspection.
Subsidies & Insurance
Fire brigade, insurance, subsidies
€165 incl. VAT
Per meter
METER OPENING
Installation acceptance
New installation or CERGA
€170 incl. VAT
Per meter
Additional meter
Same address
€135 incl. VAT
Isometric plan
Optional on request
+€40 incl. VAT
Add when booking
* All prices shown include VAT (21%). Valid for Brussels, Wallonia and Flanders.
Why choose Certinergie?
A trusted inspection body, recognised for its expertise and responsiveness.
CERGA accredited body
Certinergie is officially accredited to carry out natural gas inspections according to standard NBN D 51-003.
Certified inspectors
Our inspectors are specifically trained and qualified for gas installation inspections.
Certificate recognised by all DSOs
Ores, Sibelga, Fluvius, Resa… Our certificate is accepted by all Distribution System Operators.
Appointment within 48h
Need an urgent inspection for meter opening? We respond quickly.
Throughout Belgium
Wallonia, Brussels, Flanders: we cover the whole of Belgium.
Personalised support I
n case of non-compliance, we guide you until you obtain your compliance certificate.
50 000+
Inspections/year
15+
Years of experience
48h
Average appointment time
4.8/5
Customer satisfaction
Frequently asked questions
Everything you need to know about natural gas inspection.
How do I know if my installation is ≤ 70 kW?
The total power of your installation is the sum of the nominal powers of all your gas appliances (boiler, water heater, cooker…). For a standard house or apartment, this is generally below 70 kW. Your boiler’s power is shown on its rating plate. If in doubt, our advisors can help you.
How long is the gas compliance certificate valid?
The compliance certificate has no fixed expiry date for domestic installations. It remains valid as long as the installation is not significantly modified. A new inspection is mandatory for major changes, appliance replacement or at the request of the DSO.
What should I prepare before the inspector’s visit?
Ensure the gas meter is accessible and that all gas appliances can be switched on. Have the technical documents for your appliances ready if possible (manuals, compliance certificates). Clear access to pipework, the boiler and ventilation grilles.
Can I sell my house with a non-compliant gas report?
Unlike the electrical inspection, there is no legal gas compliance obligation for property sales. However, the new owner will need a compliance certificate to open the gas meter. It is therefore advisable to bring the installation into compliance before the sale.
What happens if my installation is not compliant?
The inspector provides a report detailing the faults found and the corrections to be made. Have the work carried out by a qualified installer, then we return for a re-inspection at a reduced rate (€75). Once the corrections are validated, you receive your compliance certificate.
Is the gas inspection different from boiler maintenance?
Yes, these are two different things. The gas inspection checks the installation’s compliance with safety standards (tightness, ventilation, evacuation). Boiler maintenance is a periodic check of the appliance’s operation and efficiency. The two are complementary but meet different obligations.
Need a gas compliance certificate?
Book your inspection online and receive your certificate immediately after the inspection.
€165Standard inspection
48hAverage appointment time
30-60 minInspection duration
ImmédiatOn-site report
WhatsApp • contact@certinergie.be • Mon-Fri 8:30am-17pm