1. Select a location
Search for the address or area you want to assess. The map loads nearby buildings, since these are normally the ones that affect local shade.
Building shadow guide
Building shadow calculator: how it works
From sun position and building height to a useful shade map.
The length and direction of a building shadow are mainly determined by the sun's position, the building's height and its location. Shadowly lets you explore those factors directly on a map.
Calculate shade for an address2. Compare date and time
The sun is lower in winter, so shadows are longer. Direction also changes substantially in the morning and evening. Test the moments relevant to your question.
3. Read the result in context
A map calculation is a practical indication, not an official report. Consider vegetation, terrain, extensions and the quality of the underlying source data.
Frequently asked questions
What data is needed to calculate building shadows?
At minimum: location, date, time and building height. Roof shape and more precise geometry improve the result.
Why are shadows longer in winter?
The sun is lower in the sky in winter, so the same building height projects a longer shadow on the ground.
Can I estimate shade for solar panels or a garden?
The map helps explore obstacles and different moments quickly. For a final design or yield calculation, use an additional professional analysis.
Explore shade on the map
Choose an address and compare hours and dates on the interactive shadow map.
Calculate shade for an address