Electrical Compliance in Belgium: When Inspection Is Require

In Wallonia, an electrical installation must be inspected and certified when a legal trigger occurs. The most common trigger is the sale of a residential property. Under rules based on the Belgian General Regulations on Electrical Installations, homes sold after a set date require an electrical conformity certificate delivered by an accredited inspection body. The inspection covers the visible and accessible parts of the installation: wiring condition, protective devices, earthing, and required documentation. It is a safety check, not a renovation, and it does not certify that the installation meets every current technical rule. For readers in Walloon Brabant, Volterre SRL describes renovation work aimed at RGIE compliance and preparing an installation to pass the control, rather than offering round-the-clock emergency repair.

What is the RGIE and why does it apply to homes?

The RGIE, short for Règlement Général sur les Installations Électriques, is the Belgian rulebook for low-voltage electrical installations. It applies to private homes as well as to commercial and public buildings. The regulation sets requirements for wiring, protective devices such as circuit breakers and residual current devices, earthing arrangements, and the documents an installation must carry, including schemas and inspection reports. The rules apply in full to new installations. They also apply to existing installations when they are modified or when a legal trigger occurs. A property sale is the most frequent trigger for private homes in Wallonia. In that case, the seller must have the installation inspected and provide the buyer with a conformity report or, where defects are found, a report listing them. The inspection concerns the parts of the installation an inspector can access without dismantling finishes. Details of what varies by region and installation type are set out in the regulation and its regional annexes.

When is an inspection mandatory?

In Wallonia, an electrical installation must be checked for conformity in several defined situations. The most common trigger is the sale of a residential property. A conformity inspection is also required when a new installation is commissioned and after certain modifications to an existing one. Periodic checks apply to some installations, and the rules differ between residential premises and non-residential premises such as offices or workshops. The inspection is carried out by an accredited body. It cannot be performed by the electrician who did the work, which is meant to keep the check independent. Local practice varies. Municipalities and grid operators may apply their own requirements, and the exact documents they ask for can differ. Owners should confirm which trigger applies to their situation before scheduling a visit. This publication does not track those local variations. General guidance on electrical conformity in Belgium comes from regional housing regulations and the standards issued by standardisation bodies, and the details change over time. An owner preparing a sale should ask the notary or the accredited inspection body which version of the rules applies to the property.

What does the inspector actually verify?

A residential conformity visit follows a checklist based on the applicable Belgian standard for low-voltage installations. Inspectors start with protection against electric shock. They check residual current devices, also called differential circuit breakers, which cut power when current leaks to earth. The typical requirement is 30 mA protection for socket circuits and bathroom circuits, with a 300 mA device at the main level. The earthing system is measured next. A common rule of thumb is an earth resistance of 30 ohms or less, though the acceptable value depends on the configuration of the installation. The inspector also verifies that circuits are correctly labelled at the distribution board, that the board itself meets the standard, and that surge protection is present where it is required. Items that are missing or non-compliant are listed in a written report. The report states a deadline for correction and serves as the reference for the follow-up visit if one is needed.

What does renovating an old house involve?

An electrical renovation in an older Walloon house follows a fairly standard order. Work usually starts with the distribution board, then continues with rewiring circuits, and ends with earthing and differential protection brought up to standard. The board is replaced first because every later circuit connects to it. Differential devices, known as residual current devices, cut power when leakage current is detected. Earthing gives fault current a safe path to the ground.

Owners choose between single-phase and three-phase supply according to the meter and the appliances in use. Heat pumps, charging stations, and other high-power equipment often justify a three-phase connection. The existing meter and the network operator's rules also constrain the choice.

The certificate obtained on sale is usually valid for a defined period. The exact validity window should be confirmed at the time of the transaction, because practice varies.

Before signing a quote, a buyer can ask for the work plan, the list of circuits, and confirmation that the installation will be delivered ready for control. These documents make later inspection and certification straightforward.

How are new demands changing home installations?

New uses of electricity are reshaping what home installations must carry. A home charging point for an electric vehicle normally requires a dedicated circuit and a study of the available power. The study checks whether the existing connection can absorb the extra load or whether an upgrade is needed. Charging points are treated as fixed equipment under general electrical safety rules, so their circuits fall within the scope of inspection.

Grid connection and metering in parts of Wallonia are managed by the network operator ORES. The operator handles its own steps and lead times, which can be longer than the electrical work itself. Requests for a new meter or a supply change should be made early.

Home automation can be wired or radio based. Wired systems cost more to install during renovation but allow easier changes later. Radio systems avoid new cabling but depend on signal quality.

Lighting plans are usually drawn room by room during renovation rather than added afterwards. Planning them early lets the electrician place ceiling boxes, switches, and circuits before walls are closed.

What should you ask your electrician before signing?

A few questions protect the owner before a contract is signed. Ask whether the quoted price includes preparation for the conformity control and the cost of any corrections. Ask for the circuit list, the earthing plan, and the location of differential devices. Ask who books the accredited inspection body and who pays if items fail. Walloon firms such as Volterre SRL commit to labelled installations ready for control at a fixed announced price; that commitment is a reasonable benchmark when comparing quotes.