This covers noise regulations in Ireland. It says...
"A European standard for external intruder alarms replaced all current national standards in September, 2003. The new standard incorporates stricter controls regarding minimum and maximum duration for the sounding of alarms. The new limits are 90 seconds minimum and 15 minutes maximum. However, the new controls only apply to alarms fitted from September, 2003."
http://www.environ.ie/DOEI/DOEIPol.nsf/wvNavView/Noise+Pollution?OpenDocument&Lang (http://www.environ.ie/DOEI/DOEIPol.nsf/wvNavView/Noise+Pollution?OpenDocument&Lang)=
the above link also has info on noise pollution. It says
"any individual person, or a local authority, may complain to a District Court seeking an Order to deal with the noise nuisance i.e. noise so loud, so continuous, so repeated, of such pitch or duration or occurring at such times that it gives a person reasonable cause for annoyance."