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DAYLIGHT & SUNLIGHT

We assist developers with pre-planning Daylight & Sunlight assessments in line with the BRE 209  Guide: Site layout planning for daylight and sunlight: a guide to good practice. Our previous work has included a wide range of residential and commercial schemes predominately located in London and surrounding counties. 

Daylight & Sunlight assessments Explained

When seeking planning permission, the local council may expect a Daylight & Sunlight assessment to be included in the application. This planning consideration will assess the lighting levels to surrounding properties and provide details on the impact on light quality. 


At Blackacre we work closely with developers and their team from an early stage in the planning process to provide design steering and prepare Daylight Sunlight Assessments ready for application. These are prepared in line with the Building Research Establishment, (BRE 209 guidance) which advises on the expected standards for developers to achieve and is recognised by Local Planning Authority as the national standards. 

We are at the forefront of this industry and ensure that we are up to date with the latest policy guidance, legal environment and technical abilities.

Daylight 3d modeling

Have you considered a Daylight Sunlight Assessment?

All our Daylight and Sunlight assessments are prepared in line with the Building Research Establishment (BRE) Good Practice Guidance 209: Site layout planning for daylight and sunlight, recognised by planning authorities. 

It is advisable to establish if your scheme will require a Daylight and Sunlight assessment early in the process and you should speak to the Local Planning Authority about this to understand their requirements.

Being proactive and getting a surveyor to prepare an assessment early on is advisable, as it can save significant time and costs in obtaining approval for your scheme.

Typically, a surveyor will need plans and drawings of your scheme to build a three dimensional model ready for software testing. The report will then be able to interpret the results against the required standard noted in the BRE 209 best practice guidance.

What does the assessment involve?

A number of Daylighting and Sunlighting methodologies are used in the testing of a 3D model of the proposed development and surrounding buildings. These are noted below and will be compared to the minimum standard guidance set out by the Building Research Establishment. 

Daylighting

Vertical Sky Component (VSC)

No Sky Line (NSL) 

Average Daylight Factor (ADF)

Sunlighting

Annual Probable Sunlight (APSH)