Understanding Shadow Analysis for Planning Applications in Ireland

What is Shadow Analysis?

Shadow analysis studies how a building or structure casts shadows at different times of the day and year. It’s crucial for developers, architects, and planners to assess the impact of new constructions on neighboring properties, gardens, public spaces, and protected areas.When conducting a shadow analysis, there are several important factors to consider. Seasonal variation plays a significant role, as shadows change noticeably between winter and summer due to the sun’s differing angles. The time of day is also critical shadows are much longer in the morning and evening compared to midday. Finally, building height and orientation can dramatically influence shadow impact, with taller structures or certain orientations casting more extensive shadows on neighboring properties, public spaces, and gardens.

• Compliance with Local Guidelines – Many Irish local authorities require shadow studies for taller developments.

• Protecting Residents & Public Spaces – Ensures sunlight access for homes, parks, and communal spaces.

• Better Design Decisions – Helps architects optimize building placement, height, and orientation.

PrePlanning.ie makes shadow analysis quick and accurate:

• 3D Shadow Simulations: Visualize shadow impact for any site in Ireland.

• Time-Specific Views: Analyze shadows for different times of day and year.

• Pre-Planning Reports: Include shadow analysis in professional reports for councils or clients.

This digital approach saves time, reduces errors, and ensures planning applications are comprehensive and compliant.

Shadow analysis is essential for responsible planning in Ireland. With PrePlanning.ie, developers, architects, and planning professionals can visualize potential impacts, optimize designs, and submit high-quality pre-planning reports—all in minutes.

The OPR’s call for digitalisation in pre-planning isn’t just about efficiency it’s about accessibility and fairness. Digital tools like PrePlanning.ie help level the playing field by giving every applicant access to the same high-quality baseline data that planners rely on. They also help authorities deliver on wider digital planning goals, such as those outlined in the National Planning Framework and Public Service ICT Strategy. When used together with existing local authority GIS and e-planning systems, PrePlanning.ie forms part of a new, more connected digital ecosystem one that makes pre-planning engagement simpler, faster, and more evidence-based.

You can easily use Shadow Analysis on your own pre-planning reports directly through PrePlanning.ie. For multiple reports or team use, contact us to set up a business account. Local authorities can also implement PrePlanning.ie as a Council-branded service to streamline pre-planning consultation clinics. To see the platform in action, call us at (056) 7820020 to request a Teams or Zoom demo of the service.