Installing a wallbox: what to check first

You do not need to notify the building authority about a wallbox, because it needs no classic building permit. A different point matters: every private wallbox must be registered with the grid operator (Netzbetreiber) before installation. If the charging power is above 11 kW, the grid operator's approval is required on top. Either way, it is always installed by a qualified electrician.

What is a wallbox?

A wallbox is a fixed charging station for electric cars. It is connected to your home's electrical installation and charges at a much higher power than a normal socket. Typical private wallboxes are rated at 11 kW or 22 kW.

For safety reasons, electric cars should not be charged permanently through a household socket, because existing wiring in residential buildings is not designed for high charging currents over long periods. For charging at home, a wallbox is therefore the safe solution.

Does a wallbox have to be registered?

Yes. A private wallbox must be registered with the competent grid operator, regardless of its power. Important: the grid operator is not your electricity supplier. Your supplier sells you the electricity, the grid operator runs the local network.

In practice the electrical contractor often handles the registration. Still, as the owner you should know whether the registration has happened and whether an approval is also needed.

When does a wallbox need approval?

Here is the key difference:

For a wallbox above 11 kW the grid operator checks whether the connection, fuses, and cables on site are suitable for the higher power. It must respond within about two months. Since 2024 it may also no longer refuse the connection merely by pointing to high grid load. Important: this approval comes from the grid operator, not the building authority. It is not a building permit.

If you buy a 22 kW wallbox but have it permanently limited to 11 kW, the grid operator may assess the matter differently. Clarify that in advance with the electrical contractor and the grid operator.

11 kW or 22 kW: which power makes sense?

For most households an 11 kW wallbox is enough. It usually charges an electric car fully overnight or during longer idle times. A 22 kW wallbox charges faster, but only helps if your car can accept that power and your connection is suitable for it.

For everyday use the maximum power matters less. More important is when your car is at home, how many kilometres you drive per day, and whether you want to charge with your own solar power.

Controllable wallboxes under § 14a EnWG

Since 1 January 2024, new rules apply to controllable consumption devices. These include private wallboxes with more than 4.2 kW connection power that are newly commissioned in the low-voltage grid.

The grid operator may briefly reduce the power draw of a controllable wallbox in certain situations to avoid an overload in the local grid. With direct control, a minimum power of 4.2 kW is generally kept. In return, you get reduced grid fees. So with a new wallbox, do not look only at price and charging power, but also at whether it is controllable and how your grid operator implements this.

Can I install a wallbox myself?

No. A wallbox needs proper installation, suitable protection, and testing by a qualified electrician. The contractor is liable for the installation and often handles the registration with the grid operator.

Especially in older houses the existing electrical installation should be checked. Not every garage or exterior wall already has a suitable cable. Sometimes a separate circuit, a residual-current device, or changes in the meter cabinet are needed.

Wallbox at the carport or in the driveway

Many people want the wallbox right at the carport, garage, or in the driveway. Plan the location and mounting well:

• Is the wallbox suitable for outdoors and weatherproof?
• Is the charging cable long enough without becoming a trip hazard?
• Is the cable run from the house connection to the wallbox sensible?
• Is the wallbox protected from vehicle damage?
• Should a second charging point be possible later?

If you are planning a carport anyway, think about the wallbox early. Empty conduits and cable routes are easier to allow for during planning than afterwards.

Does the wallbox need a building permit?

For the wallbox itself you usually need no building permit. It is a technical device on the house, garage, carport, or parking space. It only becomes relevant in building law when you build around it, for example a new carport, a roof, or an extra parking space. Then the usual rules for that structure apply.

In a homeowners' association, a rented flat, or with shared parking spaces, consent or a resolution may also be needed. That is not a classic wallbox topic, but often decisive in practice.

Checklist before installation

• Which grid operator is responsible?
• 11 kW or 22 kW, and can your car use the power?
• Registration only, or approval as well?
• Is the wallbox controllable under § 14a EnWG?
• Is the home's electrical installation suitable?
• Is a separate circuit planned?
• Is the mounting spot weatherproof and easy to reach?
• Should the wallbox run with photovoltaics or energy management?
• Do a landlord, co-owners, or neighbours need to be involved?

Conclusion

Your own charging station makes an electric car much more convenient in daily life. Before installation, though, you should clarify registration, approval, power, the electrical installation, and controllability. In many cases an 11 kW wallbox is the pragmatic choice. If you want 22 kW, check especially carefully in advance whether the car, the connection, and the grid operator go along with it.

Check your project in a few minutes with BauErlaubt, especially when you plan wallbox, carport, and parking space together: Start the free pre-check.

This article is for general information only. It does not replace electrical planning, legal advice, or a binding statement from the grid operator or an authority.