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Assessing cumulative effects at the screening stage A series of individually low-level impacts may, in combination, produce a significant impact. When determining likely significant effects, the combination with other plans and/or projects should also be considered to take account of cumulative impacts during the assessment of the plan or project. The in-combination provision concerns other plans or projects that have been already completed, approved but uncompleted, or proposed (i.e. for which an application for approval or consent has been submitted). In addition, it is important to note that the assessment of cumulative effects is not restricted to the assessment of similar types of plans or projects covering the same sector of activity. All types of plans or projects that could, in combination with the plan or project under consideration, have a significant effect, should be included during the assessment. Similarly, the assessment should look at the cumulative effects, not just between projects or between plans but also between projects and plans (and vice versa) . For example, a new project to build a major motorway may on its own not adversely affect the site, but when considered in combination with an already approved housing development plan for the same area, the impacts may become significant enough to adversely affect the site. By contrast, a plan may have no significant impact on Natura 2000 sites on its own but may be assessed differently if considered in combination with an already proposed or authorised major development project not included in that plan. See further details in the Article 6 Guide – section 4.5.3.

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Source: EUR-Lex (Cellar) · retrieved 2026-09-25 · Text as adopted (Official Journal); later amendments are not incorporated in this text.