Adding smart home to an existing house without opening the walls

What can you add without opening up the walls?

The short answer: most of the functions people actually use day to day. Shelly-level smart devices typically fit behind an existing switch or socket and run on the wiring that's already there. No wall needs to come down, because the device uses the existing wiring; it just makes the switching smarter.

Lighting control

A module fitted behind a standard wall switch lets you control lighting from an app, on a schedule, or by voice, while the physical switch stays in place and works exactly as it did before.

Heating and thermostats

Smart thermostats can be fitted to an existing heating system, radiator-based or underfloor, and allow room-by-room, schedule-based heating control, which is especially useful for holiday homes or properties used less often.

Sockets and appliances

Smart plugs and relays let you switch certain appliances, a water heater or a pool pump, for example, remotely, and keep an eye on their consumption.

Blinds and shading

Existing motorized blinds or shutters can also be upgraded with a smart module, enabling scheduled opening and closing, for instance timed to sunrise or sunset.

When do you actually need new wiring?

If you want a function that never had wiring in the first place, a switch or sensor in a new location, for example, some electrical work is unavoidable. The same applies if the goal is a full KNX-level, centrally controlled system: that's genuinely worth it for a new build or a full renovation, where wiring can still be planned freely rather than adapted to what's already there.

What does the installation process look like?

It starts with a short needs assessment: which functions you want to control, and what the existing electrical setup looks like. That determines whether a Shelly-level retrofit is enough, or whether a Loxone-level, centrally controlled system makes more sense, since Loxone can also integrate Shelly-level devices into one interface. Installation itself typically takes a day or two, depending on the number of functions, followed by testing the system and walking you through how to use it.

Common misconceptions

Many people assume smart-home features only make sense in a new build. That's not true: a large share of the devices on the market were designed specifically for existing properties, precisely so the upgrade doesn't require renovation or opening up walls. Another misconception is that a system like this is complicated to set up. In practice, most functions are configured through a simple app, and the system can grow at your own pace.