EN 17037 UK Annex — Daylight Factor

Standards

EN 17037 adapted for UK planning

The UK national annex to EN 17037 applies UK-specific sky model parameters and threshold values. It provides 50% and 95% space coverage analysis, as required by BRE documentation for planning authorities in the UK.

DL-Light produces the full UK annex synthesis report directly applicable to UK planning submissions, covering Minimum, Medium, and High performance levels with the UK-specific thresholds.

UK sky model and threshold values
50% and 95% space coverage levels (BRE doc section 32)
Three EN 17037 performance levels
Full synthesis report for UK planning
Applicable to the UK

Frequently asked questions

What is Daylight Factor per EN 17037 (UK)?

Daylight Factor per EN 17037 UK annex is the British adaptation of the European standard for climate-independent daylight assessment. It incorporates UK-specific requirements and building classification criteria while maintaining the overcast sky methodology.

How does DL-Light compute it?

DL-Light implements the UK annex of EN 17037 Method 1, calculating Daylight Factor at working planes using Radiance under the CIE overcast sky. It applies UK-specific compliance criteria and generates reports formatted for UK building standards.

What thresholds or standards apply?

The UK annex adapts EN 17037 DF thresholds for British building types and contexts. Requirements vary by room function and building classification: residential areas 2%, offices 1.5%, other spaces 1%, with additional uniformity and minimum criteria per UK standards.

Going further

Read the full DL-Light user-guide reference for EN 17037 UK Annex — Daylight Factor: Windows guide · macOS guide.

EN 17037 UK Annex — Daylight Factor

EN 17037 adapted for UK planning

Frequently asked questions

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