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Daylight & Sunlight Assessments

Daylighting and sunlight assessments are requirements for certain planning applications, BREEAM, and sustainability assessments. They determine the available natural daylight to enter the proposed development and surrounding buildings.

What are Daylight assessments?

Daylight assessments are the process of dynamically modeling the proposed development to assess the available natural light within the proposed rooms. Access to natural light can reduce energy & carbon usage, and improve the quality of the lighting within the space. Although not a mandatory requirement for all planning applications, a number of planning authorities will request a daylight and sunlight assessment to ensure that the development is meeting the minimum standards. Additionally, sustainability assessments such as BREEAM or LEED can set credits against the daylight performance of the proposed development.

How are daylight and sunlight assessments calculated?

To calculate and assess the daylight and sunlight performance of a proposed development, a dynamic simulation model is created through modeling software such as IES or Designbuilder. The software allows for accurate models incorporating adjacent buildings, local shading, opening sizes and orientations to be modeled to understand the levels of available natural light.

As part of this process, recommendations can be made to ensure the ADF figures are being met.

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Sustainability & Building Compliance

Vision Energy are a leading Sustainability & Energy consultancy working nationwide. We specialise in calculations & reports covering Building Regulations, Planning Permission and all other sustainability or energy needs within the construction sector. With a vast amount of knowledge and experience having worked on thousands of projects across the UK one of our engineers would be more than happy to assist you on your project. SAP Calculations | SBEM Calculations | Energy Statements | BREEAM Pre-Assessments | M&E Design | EPC's | Water Efficiency | Air Permeability

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What are the Average Daylight Factor (ADF)?

BRE Guidelines have been set for minimum standards of daylight factors, also known as the ADF, the ADF is defined as  ‘A ratio of total daylight flux incident on a reference area to the total area of the reference area, expressed as a percentage of outdoor luminance on a horizontal plane, due to an unobstructed sky of assumed or known luminance distribution’

The ADF method takes into account:

  • The diffusible visible transmittance of the glazing to the room in question (how much light gets through the window glass)
  • The net glazed area of all the windows in the room
  • The total area of the room surfaces (floor, walls, ceiling and windows)
  • The angle of visible sky reaching the window/windows in question

The recommended ADF value is dependent upon the use of the room in question. The BRE Guidelines suggest % ADF value for each of the following rooms:

  • Kitchens – 2%
  • Living Room – 1.5%
  • Bedrooms – 1%

If the given room meets its relevant criteria, then it will be regarded as having adequate daylight.

How long do daylight and sunlight assessments take?

The turnaround time on this assessment will vary depending on the size and complexity of the project, however, our turnaround times start at 5 working days

Can I gain BREEAM credits from this report?

our consultants are all trained and competent in providing assessments and reports to satisfy the requirements of HEA01, we also have in-house BREEAM assessors in case you need to check requirements or additional advise

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