KNX or wireless: which smart home system suits your house?

KNX: the backbone for new builds and full renovations

KNX is an international standard for building automation that has existed for more than 30 years. All switches, sensors and actuators share one control cable, laid alongside the power cable. Hundreds of manufacturers make compatible devices, so you are not tied to a single supplier.

Because communication runs over its own cable, KNX is very reliable and lasts for decades. Lighting, blinds, heating, ventilation and a weather station can be connected cleanly in one system.

• Ideal for new builds and full renovations, when walls are open anyway
• Very stable, no batteries, no radio interference
• Independent of manufacturers and expandable in the long term
• Higher initial costs, because planning and cabling are needed

Wireless: get smart without opening walls

Wireless systems such as Zigbee, Z-Wave, EnOcean or the new Matter standard communicate by radio. You replace an existing switch or place an actuator behind the switch box, without pulling new cables. Especially practical: EnOcean switches need neither cable nor battery, they take their energy from the press of the button.

In rented apartments or homes that are lived in, wireless is often the only realistic option. The devices usually form a mesh in which they pass signals on, so distant rooms are reached too.

• Ideal for retrofits in existing houses and rented apartments
• Quick to install, lower entry costs
• Batteries in sensors need changing from time to time
• Good planning needed so the radio network is stable everywhere

In practice: often a combination

Many houses use both. KNX controls the built-in functions such as lighting, blinds and heating, while wireless devices are added later, for example a window sensor in an extension or a water sensor in the laundry room. A shared control unit connects both worlds, so you operate everything in one app.

What matters is that the control unit runs locally in the house. Light switches and heating then keep working when the internet is down, and your data stays with you.

How to decide

Whatever the system, the network is the foundation. Well-planned Wi-Fi and separate networks for devices, cameras and guests make every smart home safer and more reliable.

• New build or full renovation: KNX as the base, wireless for additions
• Existing house without renovation: wireless, well planned
• Rented apartment: wireless, so everything moves with you
• Office or commercial building: usually KNX, combined with access control