Noise Abatement Ordinance
(NAO)

¹ The pro­ject own­er of a new build­ing shall en­sure that the sound­proof­ing of the ex­tern­al build­ing ele­ments and par­ti­tions of rooms sens­it­ive to noise, and of the stairs and build­ing fa­cil­it­ies com­plies with re­cog­nised codes of build­ing prac­tice. These are in par­tic­u­lar, for noise from civil aero­dromes that are used by heavy air­craft, the stricter re­quire­ments, and for noise from oth­er sta­tion­ary in­stall­a­tions, the min­im­um re­quire­ments, of SIA Stand­ard No 181 of the Swiss So­ci­ety of En­gin­eers and Ar­chi­tects.³⁰

² If the im­pact thresholds are ex­ceeded but the re­quire­ments of Art­icle 31 para­graph 2 for grant­ing plan­ning per­mis­sion are ful­filled, the en­force­ment au­thor­it­ies shall im­pose stricter re­quire­ments for the sound­proof­ing of the ex­tern­al build­ing ele­ments ap­pro­pri­ately.

³ The re­quire­ments also ap­ply to the ex­tern­al build­ing ele­ments, par­ti­tions, stair­ways and build­ing fa­cil­it­ies that are con­ver­ted, re­placed or newly in­stalled. On re­quest, the en­force­ment au­thor­it­ies grant re­lief if com­pli­ance with the re­quire­ments would in­volve un­reas­on­able cost.