What is a blue line boundary?

The blue line boundary is a secondary boundary that you can identify on a location plan. It highlights any additional owned land or property that is relevant to the application. You do not have to draw a blue line boundary, although it is helpful for Local Authorities if you show other owned land.

Read our guidance for more information¹.

1. https://www.planningportal.co.uk/services/help/location-plan-feature/drawing-a-site-boundary