Article 12 4.

In exceptional cases, where the nature, complexity, location or size of the proposed project so require, Member States may extend the time limit referred to in paragraph 3 by a maximum of 20 days, before its expiry and on a case-by-case basis. In that event, the single point of contact concerned shall inform the project promoter in writing of the reasons justifying the extension and of the deadline for its reasoned conclusion.