Timing is one of the most critical factors in ecological planning. Missing a survey window can delay a planning application by months or, in some cases, up to a full year. For developers, understanding the ecological survey calendar is essential for keeping projects on track.
Different protected species require surveys at specific times of year. Bat activity surveys are typically undertaken between May and September, with peak reliability during the summer months. Great crested newt surveys are generally carried out between mid-March and mid-June. Reptile surveys are most effective between April and September, while dormouse surveys extend from April through to November.
These seasonal constraints exist because surveys rely on detecting species when they are active and under suitable environmental conditions. Surveys carried out outside these windows are often inconclusive and unlikely to be accepted by Local Planning Authorities.
A common issue arises when surveys are commissioned too late in the planning process. Developers sometimes wait until an LPA requests ecological information, by which point the appropriate survey window may have passed.
However, not all ecological work is restricted by season. Preliminary Ecological Appraisals can be carried out year-round and provide a valuable starting point. Desk studies, habitat mapping, and initial assessments can also progress projects outside peak survey periods.
By planning ahead and engaging ecologists early, developers can align project timelines with ecological requirements and significantly reduce the risk of delay.
