Daylighting Modelling

We have a specialist team experienced in carrying out daylighting assessments. These assessments are undertaken in support of planning applications for new build projects or extensions which could impact on adjacent developments.

The Daylighting Team are also involved in projects to maximise the daylighting in buildings and we are experienced in conducting climate-based daylight modelling assessments.

Daylight & Sunlight Impact Assessments for Planning

Most new urban developments require a daylight and sunlight impact assessment for submission to the local planning authority. These assessments ensure that new buildings do not significantly reduce daylight or sunlight for neighbouring properties, gardens, or public spaces.

Our daylight analysis includes:

Reviewing proposed and existing skyline views
Assessing internal daylight quality within the new building
Predicting daylight and sunlight impact on windows of adjacent buildings
Evaluating effects on public areas, gardens, or development land
Conducting Right of Light assessments for existing dwellings (England only)

We use advanced 3D daylight modelling software to create accurate models of the proposed development and surrounding areas. This allows us to calculate Vertical Sky Component (VSC) values before and after construction.

Spatial Daylight Autonomy (sDA) and Annual Sun Exposure (ASE)

For projects targeting the WELL Building Standard, we calculate sDA and ASE to balance natural light and glare. sDA measures the percentage of floor area receiving adequate daylight, while ASE identifies areas with excessive sunlight.

Our team uses 3D simulations to ensure compliance and improve occupant wellbeing.

Average Daylight Factor (ADF) Calculation

ADF calculations compare indoor light levels to outdoor conditions and are often required for BREEAM Health and Wellbeing credits. We perform detailed daylight analysis to demonstrate compliance and enhance user comfort.

Climate Based Daylight Modelling (CBDM)

For education projects, such as those under the ESFA Priority School Building Programme, we deliver CBDM assessments. This advanced method evaluates daylight throughout the school day and year, influencing internal layouts and façade design. Metrics include Useful Daylight Index (UDI) and Spatial Daylight Autonomy (sDA), ensuring classrooms receive optimal daylight.

Related
projects

The Swan School, Oxford

KJ Tait were appointed by Galliford Try to carry out an assessment of the daylight available to a proposed new 3FE Secondary School in Oxford including a separate sports hall.

St John’s College Student Hub, Cambridge

KJ Tait were appointed by St John’s College to carry out an assessment on how to increase the daylight levels within the student hub.

KJ Tait