About the Project
We were appointed to carry out a daylight, sunlight, and overshadowing assessment for the surrounding properties that were adjacent to the proposed development at Hoop lane, London.
The methodology used for the assessment followed the most recognised guidance document for daylight and sunlight within dwellings titled ‘Site Layout Planning for Daylight and Sunlight – A Guide to Good Practice’ Second Edition 2011.
The following daylight, sunlight, and overshadowing assessments were carried out with the use of computer modelling software in order to provide the most accurate results possible.
- Vertical Sky Component (VSC)
- Annual Probable Sunlight Hours
- Overshadowing Assessment
The VSC results showed that the proposed extension to the rear of Hoop Lane would only cause a negligible impact to the amount of daylight received by the windows of the neighbouring properties. As each of the windows were within 0.8 times of their former values, they therefore satisfied the requirements.
The results for the windows within neighbouring properties showed that Window W1 would receive a minor adverse impact to its annual amount of sunlight hours, and window W3 would receive a minor adverse impact to its amount of winter sunlight hours.
However, as windows W1, W2 and W3 all serve the same room the overall impact was likely to be negligible. Also, as each of the windows total amount of annual and winter sunlight hours received were still considerably above the minimum requirements of 25% and 5% respectively, they therefore satisfied the sunlight requirements.
The overshadowing results showed that the proposed development will have no impact on the amount of overshadowing experienced by the neighbouring rear garden areas, therefore satisfying the guidelines in terms of overshadowing.
In summary our assessment showed that the proposed rear extension to Hoop Lane, London would have no impact to the amount of overshadowing within neighbouring gardens and only a negligible impact to the amount of daylight received by neighbouring windows. Although there was a very small minor adverse impact to the amount of annual and winter sunlight hours received to two neighbouring windows, the sunlight hours received in total would still be considerably above the minimum target values.
As the overall requirements of the daylight and sunlight Guide were satisfied, we considered the proposed extension as acceptable in terms of daylight and sunlight.
