Daylight and Sunlight Assessment

When will you require a Daylight & Sunlight Assessment?

  • At design stage to ensure optimum daylight standards
  • Home Quality Mark (HQM) or Code for Sustainable Homes (CSH)
  • BREEAM Visual Comfort HE 01
  • Planning requirement

There are two types of Daylight & Sunlight Assessments. The first is for the development itself which is covered here. The second is the Daylight & Sunlight analysis carried out to test the impact of your proposal on the neighbouring or surrounding buildings.

Providing an environment with sufficient daylight is very important. This is for both the visual comfort and the emotional well-being of the occupants and users. Moreover, adequate amounts of daylight can reduce the dependence on artificial lighting reducing the energy demand.

Daylighting calculations are essential during design stages, to help designers achieve optimum results. They are part of the Home Quality Mark and BREEAM assessments. Although visual comfort is not a mandatory credit, it is an important aspect of good design.

Local authorities sometimes require a Sunlight and Daylight report to confirm adequate light levels within the proposed development itself. Where site constraints exist, these can be overcome by ensuring sufficient window sizes, limiting room depths, and use of light-coloured interiors. Our analysis will help in determining the best solutions for your specific project.

We use dynamic simulation with hourly weather files. Modelling takes into account all the factors that are essential in providing accurate results, such as orientation, geometry, location, surrounding buildings and even vegetation. Accompanied by clear and concise reports.

What would a Daylight and Sunlight report contain?

A Sunlight & Daylight within a development report will typically contain the following tests:

  • Average Daylight Factor
  • Daylight Distribution (No Sky Line)
  • Room Depth (if required)
  • Annual Probable Sunlight Hours (depending on the orientation)

An Overshadowing Assessment to Gardens and Open Spaces section might be required as well.

Pro Sustainability Daylight and Sunlight

Why Pro Sustainability?

We collaborate with your design team to reach optimum solutions
We study several options to meet the guidelines
We can advise on more holistic approach such as thermal comfort or energy demand if required

The Sun does not realise how wonderful it is until after a room is made.

– Louis Kahn