First, clarify the comparison
KNX is a building automation standard that can use different communication media. KNX TP uses a dedicated cable; KNX RF is wireless. Wi-Fi, Zigbee and Thread are wireless technologies, while Matter is an application standard that can operate over supported networks. They are not all interchangeable categories.
New villa or existing home?
In a new build or major renovation, a dedicated KNX TP bus can be planned alongside electrical work. For an occupied property, wireless devices may reduce the need for new control cabling. KNX RF can also extend a KNX installation; check the available products and required couplers.
Reliability depends on design
A wired bus avoids reliance on radio coverage for its connected functions. Wireless performance depends on signal conditions, device placement and network design. A site assessment should consider walls, interference, power availability and the consequences of a failed component.
Local control and remote access
Ask which actions remain available if the internet or a controller fails. Some wireless and Matter configurations support local control; other features may depend on a hub, vendor cloud or internet access. KNX functions can operate locally, while remote access usually needs additional infrastructure.
Compatibility and ongoing ownership
Check exact device models, functions, controllers and integrations before committing. Confirm who will provide configuration backups, documentation, user access and support. KNX installations commonly use ETS for configuration; wireless ecosystems have their own setup and maintenance requirements.
Compare total cost, not only device price
Compare design, cabling, devices, gateways, installation, programming, testing and maintenance. A smaller wireless upgrade and a complete wired installation have different scopes; neither has a universal price advantage. Request an itemised proposal based on the site.
Can both approaches work together?
Yes, a hybrid design may be appropriate when its components and integrations are verified. Define exactly which features cross between systems and who will support them; interoperability should be demonstrated for the specific devices rather than assumed.
Sources
KNX technology · Connectivity Standards Alliance: Matter FAQ