As of April 1, 2026, the partial revision of the Federal Law on Environmental Protection (LPE) and the Noise Protection Ordinance (OPB) has been in force. In practice, cantonal and communal authorities can now authorize the construction of housing in noisy areas even if the immission limit values are slightly exceeded in front of the windows. Until now, these limits blocked thousands of projects near roads, train tracks or tram lines, especially in Geneva, Vaud and Zurich, where the lack of apartments has been the favorite topic of any conversation between neighbors for years.
The new rule is not a blank check. When the limit values cannot be respected with reasonable efforts, the building permit is only granted if appropriate compensatory measures are installed in the rooms, such as controlled ventilation to avoid having to open the window, or specific protections on the facades. The stated idea of the Federal Council is to better coordinate the fight against noise with urban development towards the interior, which is the official line since the revision of the LAT.
For those looking for an apartment, this changes little in the short term, but it is worth knowing that a perfectly legal new building can be in an area where permission would not have even been given before. If the ad says "lumineux et calme" but the property faces a busy road, mechanical ventilation and reinforced glass are now the norm, not a luxury. Before signing, it is worth asking the owner for the project's acoustic report, opening the window during rush hour and asking what ventilation system the home is equipped with.
For those considering buying or investing in a new project, the reform opens the door to more offerings in well-connected neighborhoods that until now were frozen. The Confederation speaks of some tens of thousands of potential homes throughout Switzerland. The measure will take time to be noticed in the market, because between planning, oppositions and construction, in this country no one builds a building in six months, except in electoral speeches.