Home lighting experts put definable limits on the extent of useful daylighting that can penetrate a space. These limits can be found in, for example, Lighting Design Basics by Mark Karlen and James Benya, John Wiley & Sons, Inc., 2004, p.34 and Interior Lighting For Designers 4th Edition by Gary Gordon, John Wiley & Sons, Inc., 1957, p.53ff. While this daylight penetration aspect of daylighting analysis can be judgmental, consideration of related adjustment to natural illumination is, in the author's opinion, well worth the effort as a pre-emptive design alert to convenience and safety.

The home Daylighting Design Schedule presents several bases of or inputs to home design analysis – 16 in all. 1. Of itself for natural light, in the house's compass orientation and, possibly, its adjustment and in personal assessment of infiltration and adequacy in daylighted spaces. 2. Ventilation as a quality control cross-check in cross-venting of sleeping areas and longer occupied rooms, plus sizing and indicative siting of both supplies and returns. 3. UV intrusion indicator of where it may be determined as less welcome and its power diminished. 4. Natural heat-build indicator for HVAC professional attention and various design means to lessen. 5. Daylight glare definition especially in areas, such as stairways, where glare threatens safety. 6. Qualification for code-compliance of aggregate glazing area to space surface area in sleeping areas, notably more problematic in such spaces within story-and-a-half structures at L2. 7. Suggestive guide to artificial lighting throughout, particularly ambient lighting and lighting controls. 8. Definitive cross-check on window and door size and site in elevations, plan view(s), and window schedule (and, possibly, door schedule). 9. Excellent perspective on the consequences of exterior design on interior functionality, occasionally leading to design changes ranging from marginal to major. 10. Guide to increased layering in low-daylight spaces. 11. Guide to continuous service rating in no- and very low-daylight spaces. 12. Guide to altering fenestration dimensions. 13. Guide to altering fenestration siting. 14. Motivation in single-storied deep spaces with exterior covers to penetrate those covers with niches in the roof, sunscreen, skylight, clerestory, etc. 15. Motivation in single-storied deep spaces with or without exterior covers to add clerestories and light wells by way of dormers and other fenestration design modifications. 16. Motivation, particularly in story-and-a-half designs, to necessarily add dormers, skylights, skylight tubes, clerestories, light wells, and other fenestration design modifications.

Comment: Note, please, that latter-day fixing of major mistakes to attain convenient and safe sizing and siting of windows, exterior door composition, luminaires, and light-reflecting and -absorbing features can be a remediation expense and physical inconvenience bigtime.

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