Sunlight & Overshadowing Assessment
BRE Guide BR 209 — Sun Hours on Ground & Overshadowing Analysis
BRE
Compliant
50%
Sun-on-Ground
Mar 21
Test Date
Proposed Building Details
Enter details of the proposed development to assess potential overshadowing impacts on neighbouring properties and open spaces.
Neighbouring Properties
Add up to 4 neighbouring properties. Expand each section to enter details.
Open Spaces Assessment
Enter details of amenity spaces that may be affected by overshadowing.
Shadow Analysis Summary
Estimated shadow lengths at key times on March 21st (52°N latitude, sun altitude at noon: 38°)
09:00
Calculating...
12:00
Calculating...
15:00
Calculating...
Shadow calculations based on solar geometry for UK latitude (52°N) on the spring equinox (21 March).