According to new figures from the Federal Statistics Office, only 1% of the country’s housing stock was vacant on June 1st - down for the fifth year in a row.
Geneva remains the tightest market, with just 0.3% of homes available, followed by Zurich at 0.4%.
Only Solothurn and Jura report vacancy rates above 2%.
Nationwide, 37,194 rental properties stood empty - 3,200 fewer than a year earlier, an 8% drop.
Properties for sale also fell, with just over 11,200 unoccupied.
A second team of 33 firefighters from French speaking Switzerland will travel to south-western France this weekend to relieve colleagues battling the wildfires.
Two Annemasse municipal officers have been attacked by a woman this week, in the latest incident to fuel concerns about violence in the cross-border town.