Noise Abatement Ordinance
(NAO)

¹ If the re­quire­ments spe­cified in Art­icles 7 para­graph 2 and 8 para­graph 2 or in Art­icle 9 are not ful­filled by new or sig­ni­fic­antly mod­i­fied pub­lic or li­censed sta­tion­ary in­stall­a­tions, the en­force­ment au­thor­it­ies shall re­quire the own­ers of ex­ist­ing build­ings ex­posed to noise to sound­proof the win­dows of rooms sens­it­ive to noise in ac­cord­ance with An­nex 1.

2 With the ap­prov­al of the en­force­ment au­thor­it­ies, build­ing own­ers may carry out oth­er struc­tur­al sound­proof­ing meas­ures provided these re­duce the noise with­in the rooms to the same ex­tent.

³ Sound­proof­ing meas­ures need not be taken if:

a.

no per­cept­ible re­duc­tion of the noise level in the build­ing is to be ex­pec­ted;

b.

they con­flict with the over­rid­ing in­terest of pre­serving loc­al char­ac­ter or monu­ments;

c.

the build­ing is due to be de­mol­ished with­in three years of put­ting the new or mod­i­fied in­stall­a­tion in­to ser­vice, or the rooms con­cerned will be con­ver­ted to pur­poses not sens­it­ive to noise with­in this peri­od.