I come to clients when the building is ready and finished and I hear: "now we want to make a smart home." It can be done - but it will cost twice as much and look half-baked. Key decisions in an intelligent building are made before the ceiling is poured, not after the tiles are laid.
This article is for those who are in the design or shell phase. If you are just planning construction - this is the best time to read this.
Podstawowe pytanie: przewodowy czy wireless?
This is the decision that determines everything else.
Wired system (KNX, Loxone, Fibaro HC3 with wired modules) – more expensive to install, but reliable for decades. There is no radio interference, the batteries do not run out, and there is no loss of range through thick walls. It is a standard in commercial facilities, office buildings and premium homes. Requires wiring at the construction stage - after finishing, it is practically impossible to implement without forging.
System wireless (Z-Wave, Zigbee, Matter) – cheaper, more flexible, can be implemented in a ready-made building. Suitable for apartments and smaller houses where it is not possible to interfere with the walls. Cons: batteries need to be replaced every few years, potential interference, limited range due to reinforced concrete.
My recommendation: if you are building a house and you have the opportunity, invest in cabling for a wired system. Cable is cheap, the work to lay it on open walls is cheap. Later capabilities and reliability are unmatched.
What to wire at the construction stage
Structured network (twisted pair cat. 6A) – this is the absolute basis. Each room should have at least two RJ-45 sockets. Cameras, TVs, networked speakers, smart TVs, consoles - anything that can be connected via cable should be. WiFi is a supplement, not a foundation.
Trasy kablowe do wszystkich kamer – plan the placement of cameras before the walls are closed. Camera at the entrance, at the gate, on every corner of the building, in the garage. Run conduits or direct UTP cables to each location. Cost at the construction stage: minimal. Cost after: forging, plastering, painting.
Sterowanie roletami – if you plan electric blinds (and you should - this is one of the most frequently used automation elements), each window should have a 230 V control cable connected to the collective box or directly to the KNX controller.
Underfloor heating with zone controllers – each zone (room) should have a separate thermostat and actuator. Wiring to the central controller at the screed stage is a trifle. The ability to manage the temperature in each room separately is a great convenience and real energy savings.
Punkt centralny (szafka techniczna) – plan a place for a 19-inch cabinet or technical cabinet where all the cables will meet: network, control and alarm. Preferably in a garage or basement, with access to electricity and ventilation. Here you will find a PoE switch, a recorder, an alarm panel, a KNX controller and a UPS.
Integration with photovoltaics and heat pump
This is an increasingly common topic. An intelligent energy management system can automatically shift electricity consumption to hours of overproduction from PV - charging a car, heating a water heater, air conditioning. However, it requires a communication interface between the inverter, heat pump and building controller. It is worth planning this already at the electrical installation design stage.
Protocols – what to choose?
KNX – European standard, over 500 manufacturers, devices from different companies work together without problems. If you want to replace one switch with another in 10 years, it is possible without replacing the entire system. More expensive equipment, but a guarantee of longevity.
Loxone – the Polish market loves Loxone. One manufacturer, consistent ecosystem, relatively easy configuration. A good option for single-family homes.
Home Assistant – open source system, runs on a local server (e.g. Raspberry Pi or mini-PC). Integrates with thousands of devices from various manufacturers. It requires more technical knowledge to configure, but gives you full control and zero subscriptions.
The most common mistake I see
The customer buys expensive devices (Philips Hue, Sonos, Somfy), installs them himself or with the help of an amateur, and then it turns out that the systems do not talk to each other, the control is via five different applications and half of the functions do not work as they should.
Smart building is not a collection of gadgets. It is a designed system where each element knows about the others and reacts as a whole. It's a good idea to plan this with someone who understands both electrical installation and system integration - before the construction crew comes in.