A quick Google search revealed the item below.
Australian Civil Aviation Order 20.9
5.1.4 An aircraft engine shall not be started or operated:
(a) within 5 metres (17 ft) of any sealed building; or
(b) within 8 metres (25 ft) of other aircraft; or
(c) within 15 metres (50 ft) of any exposed public area; or
(d) within 15 metres (50 ft) of any unsealed building in the case of an aircraft with a maximum take-off weight exceeding 5 700 kg (12 566 lb); or
(e) within 8 metres (25 ft) of any unsealed building in the case of an aircraft with a maximum take-off weight not exceeding 5 700 kg (12 566 lb);
There is probably something similar in the EASA system, or in the more general Health & Safety legislation, but my search did not find it.