Starlings are protected under the Wildlife and Countryside Act 1981, which makes it illegal to intentionally kill, injure or take a starling, or to take, damage or destroy an active nest or its contents. Because they are on the red list of birds causing concern they are further protected by a class licence.
In the unlikely event a homeowner is troubled by large numbers of starlings then the only course to control would be to use bird spikes as deterrents.
Except in very specific circumstances, Starling population control is illegal and any effort to reduce inconvenience should be limited to dissuading the birds from using specific roosts that have a direct impact on human health and safety.
They nest in loose colonies and do not establish and defend a proper territory - only the immediate area around the nesting cavity is defended. The whole colony feeds communally in what is termed a home range.
To attract a mate, the male builds the base of the nest from dry grass and leaves in a hole and sings from perches close to the nest entrance. The female completes the nest by making a nest cup and lining it with fine grasses, moss and feathers.