May 26, 2025
Acquired old buildings rarely appear "smart" at first glance. However, existing properties are ideal playgrounds for modern building automation: The basic structure is in place, the purchase price is often low, and any retrofitting solution that enhances comfort, security, and energy efficiency significantly increases market value. This guide shows you how to integrate a smart eco-system into your newly purchased property step by step, without dust and demolition work.
"The combination of a low purchase price and smart retrofitting is the biggest lever for green returns in the Swiss old building segment."
System | Typical Products | Advantages for Old Buildings | Disadvantages |
---|---|---|---|
Matter / Thread | Aqara, Eve, Nanoleaf | Secure mesh wireless networks, very low power consumption | First generation of devices still limited |
Zigbee 3.0 | Philips Hue, Bosch Smart Home | Wide ecosystem, affordable sensors | Bridge required, moderate range |
Z-Wave Plus | Fibaro, Aeotec, Heatit | Encrypted home automation (Security S2) | License fees → higher device costs |
KNX RF / TP | ABB, Gira, Hager | Industry standard, long life cycles | Planning effort, more expensive |
• DIY: Battery-operated sensors, purely plug-in actuators.
• Professional Service: Everything that involves the distribution board or 230 V wiring (SVG, NIV).
A combined approach can save up to 40% on installation costs.
Note: Check for combinability, cantonal programs are often stackable with federal funds.
Investor Bührer purchased a six-family house in Aarau in 2024.
Measures: Zigbee thermostats, PV-connected heat pump, wallbox cluster, Home Assistant.
Investment: 41,000 CHF (after subsidies 28,500 CHF).
Outcome: Heating energy down 27%, electricity consumption down 38%, 0% vacancy rate since then. Market value according to Wüest Partner increased by +190,000 CHF ROI > 6 times in 18 months.
Yes, KNX IP gateways (e.g., ABB i-BMS) export group addresses to Home Assistant, which connects devices via the Matter Bridge.
Pay attention to EN 15684 Class 4 and S2-encrypted protocols (Z-Wave S2, Thread 1.3). Rule: Prefer two-factor authentication + local access.
On the contrary: Many Swiss insurers (Mobiliar, Helvetia) offer 5-10% premium discounts for certified water sensor or security packages.
Forced auctions provide the physical basis, Smart Home technologies provide the digital turbo. With manageable capital, funding, and a clear system choice, you can transform an older building into an energy-efficient, desirable, and profitable investment, ready for the next decade.