My local council offers this advice on what constitutes a noise nuisance.
What is a noise nuisance?
This cannot be easily defined, but could be described as an unreasonable interference with the normal enjoyment of your property. It will usually be something that is occurring regularly and/or continuing for a period of time that makes it unreasonable.
The following are unlikely to be a statutory nuisance:
a one-off party
neighbours arguing
a lawnmower being used
a baby crying or dogs barking occasionally
Noise that we have no control over:
road traffic/engine noise on the public highway
people shouting/laughing or screaming on a public road or footpath
air traffic noise
There is no maximum noise level (decibel level) that relates to noise nuisance. Each case is judged on what might be reasonable and normal for the situation. We will take into consideration factors such as:
when the noise is happening (noise can be a nuisance at any time of the day or night)
the duration of the noise
how often it is happening
the type of noise
whether there is social acceptance (for example, bonfire night or church bells)
Unfortunately there is no added protection for shift workers or people who are studying or ill, and may want or expect a great degree of peace and quiet in the day than might be the norm.