Designing Projects that Avoid Licensable Impacts: Practical Strategies
Avoiding licensable impacts is one of the most effective ways to reduce ecological risk, programme uncertainty, and project cost in Scottish development. Under the Conservation of Habitats and Species Regulations 2017 (as amended in Scotland) and the Wildlife and Countryside Act 1981, many species and their resting places are strictly protected. When impacts cannot be avoided, a NatureScot licence may be required, which can influence design, timing, and construction methods.
This article outlines practical design and planning strategies that help site teams and project managers avoid triggering licensable impacts, reducing risk before it reaches the construction phase.
Why avoiding licensable impacts matters
Licensable impacts typically arise when a project risks:
damaging or destroying a breeding site or resting place;
disturbing protected species at critical times;
obstructing access to roosts, holts, setts, or other resting places (NatureScot 2020; Scottish Government 2019).
Licensing introduces additional evidential requirements, design complexity, seasonal constraints, and monitoring commitments. Where impacts can be avoided through design, the project benefits from:
reduced programme uncertainty;
fewer dependencies on ecological survey windows;
simplified contractor documentation;
reduced enforcement risk.
Avoidance is also central to NatureScot’s application of the licensing tests, particularly “no satisfactory alternative”.
Early identification of ecological constraints
Avoidance relies on understanding constraints early enough to influence design. Key steps include:
Preliminary ecological assessment during feasibility
Screening at feasibility stage allows ecological risk to be integrated before design decisions are fixed. Early assessment identifies roost features, habitat corridors, and protected species that may otherwise be discovered too late.
Integrating ecological survey findings into iterative design
Survey data should feed directly into layout planning, engineering design, and utilities routing. Where updated survey results arise, designs must be reviewed accordingly.
Flagging potential licence triggers early
Species such as bats, otter, water vole, badger, and certain nesting birds may trigger licences if impacts cannot be avoided. Identifying these early helps determine whether design adaptation is a feasible alternative to licensing.
Practical avoidance strategies in building projects
Retaining roost features in place
Where buildings contain bat roosts, minor design changes (such as retaining small sections of roof fabric, maintaining access gaps, or avoiding works to specific elevations) may remove the need for a licence.
Avoiding disturbance at sensitive periods
Programme design can avoid maternity seasons for bats, breeding bird periods, or sensitive phases of otter breeding. Timing avoidance is often sufficient to prevent licensable disturbance.
Managing lighting early in design
Lighting is a common cause of licensable disturbance for bats (BCT 2023). Avoiding illumination of roost entrances or commuting routes prevents roost abandonment and may remove licensing requirements entirely.
Avoidance strategies in infrastructure and linear works
Micro-siting of infrastructure
Shifting paths, trenches, or columns by small distances can avoid holts, couches, setts, or roost trees.
Retaining riparian habitat connections
For otter and water vole, linear connectivity is essential. Designing crossings, culverts, or riparian regrading to maintain functional connectivity supports compliance and reduces impact-based licensing.
Protecting mature trees
Retaining mature or veteran trees, especially those with roost features, is often more straightforward than replacing their ecological function through compensation.
Construction-phase measures that support avoidance
Clear demarcation of exclusion zones
Temporary fencing, signage, and marked buffers help ensure that contractors avoid sensitive areas identified in the ecological constraints plan.
Pre-works checks
Targeted pre-works ecological checks ensure that conditions have not changed since earlier surveys, reducing the risk of unexpected licensable impacts.
Toolbox talks aligned with ecological risks
Brief, task-specific communication ensures that site teams understand ecological restrictions in operational terms.
Stop-work protocols
Robust protocols prevent accidental offences when unexpected ecological issues arise.
When avoidance is not possible
In some cases, engineering or planning constraints prevent avoidance. If impacts on protected species cannot be avoided through design or timing adjustments, licensing becomes unavoidable. In these scenarios, avoidance must still be demonstrated as part of Test 2 (“no satisfactory alternative”) in the licensing process (NatureScot 2020). Documenting design evolution is therefore essential.
Why avoidance supports successful planning and licensing
Avoiding licensable impacts where feasible strengthens the defensibility of the planning submission and reduces the risk of planning conditions requiring additional ecological information. Where licences are needed, demonstrating that avoidance was attempted (through design changes, micro-siting, or timing alterations) supports compliance with the Habitats Regulations.
Conclusion
Designing projects to avoid licensable impacts is both a legal and practical priority in Scottish development. Early ecological assessment, iterative design, precise communication, and robust on-site procedures enable project teams to reduce ecological risk, avoid delay, and maintain compliance with protected species legislation. When applied from feasibility through construction, avoidance is the most effective strategy for delivering predictable ecological outcomes.
References
Bat Conservation Trust 2023. Bats and On-site Working Practices: Guidance for Professionals. Bat Conservation Trust, London.
NatureScot 2020. Protected Species Licensing: Guidance for Applicants. NatureScot, Inverness.
Scottish Government 2019. Wildlife Crime and Protected Species. Scottish Government, Edinburgh.
JNCC 2019. European Protected Species and Conservation Status Assessments. Joint Nature Conservation Committee, Peterborough.