NBN D51-003 · NBN B61-002
Gas inspection
Full inspection of your gas installation (natural gas, propane, butane) to NBN D51-003 — for meter activation, short-term rental, sale, or conversion to rich gas.
The gas inspection exists to make your installation safe and to prevent carbon monoxide poisoning, which is still too common in Belgium. Atlas Contrôle is accredited by BELAC (No. 663-INSP, ISO/IEC 17020) to inspect natural gas, propane and butane installations against the NBN D51-003, D51-004 and D51-006 standards.
The inspection is mandatory before your grid operator activates a meter, required, less than 2 years old, for the short-term rental certificate in Brussels and Wallonia (Airbnb, Booking), and strongly recommended when selling, bringing an installation into compliance, or converting to rich gas in the Brussels region.
ⓘ Language of the report: the official report is issued in French or Dutch, as Belgian law requires. An English summary is available on request, free of charge.
Natural gas meter activation
Mandatory before your grid operator commissions the meter (Sibelga, ORES, RESA, Fluvius). You receive the report and the isometric diagram to forward to them.
Propane & butane
High- and low-pressure inspection for tanks, cylinders and cascade installations. Required before your supplier is allowed to refill your tank.
Short-term rental
Airbnb, Booking, seasonal lets: for accommodation of fewer than ten guests, Brussels and Wallonia issue a simplified inspection certificate, valid for 5 years, based on compliance certificates less than 2 years old, including the gas one.
Boiler room acceptance > 400 kW
In Wallonia, mandatory for boiler rooms with an installed output above 400 kW (Walloon Government Decree of 29/01/2009, art. 11, §2).
Isometric diagram: surveyed on site
For a simple residential installation, the inspector draws up the diagram during the inspection. For any other installation, your installer must provide it.
Transparent pricing
Prices include VAT, no surprises. Personalised quote within 24h.
Re-inspection: this rate applies within one month of our inspection. After that, the new visit is a full inspection at the full rate.
✅ What's included
- ▸ Tightness test of the gas pipework
- ▸ Verification that pipe routing complies with the standard
- ▸ Inspection of every combustion appliance connection (boiler, hob, stove)
- ▸ Inspection of the flue gas evacuation ducts
- ▸ Verification of room ventilation
- ▸ Isometric diagram surveyed on site (simple residential installation)
- ▸ Pressure drop calculation (max 1 mbar at the appliance inlet)
- ▸ Official report issued within 24-48h
⚖️ Legal framework
- ▸ NBN D51-003 — Indoor installations supplied with natural gas
- ▸ NBN D51-004 — Installations for gas lighter than air
- ▸ NBN D51-006 — Butane / propane in gaseous phase (MOP max 5 bar)
- ▸ NBN B61-001/002 — Heating systems in buildings
- ▸ BELAC accreditation No. 663-INSP (ISO/IEC 17020)
Atlas Contrôle ASBL is accredited by BELAC under No. 663-INSP (ISO/IEC 17020) for gas installation inspections (NBN D 51-003, D 51-004, D 51-006).
Frequently asked questions
Is a gas inspection mandatory when selling a property? ▾
What is the difference between natural gas and propane? ▾
How long does the inspection take? ▾
What should I prepare before the visit? ▾
Does the rich gas conversion affect my installation? ▾
In what language is the report issued? ▾
Ready to schedule your inspection?
Free quote within 24h. Fast callouts anywhere in Belgium.