Under Step 2, delete the last sentence of first bullet (delete: Consider the required measurement schedule: the second measurement must be taken at least five months after the first.).
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Ashwini Arun
WSP
Senior Sustainability Manager
SPECIAL REPORT
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Establishment
Option 1. Daylight Measurement (2 points)
Achieve illuminance levels between 300 lux and 3,000 lux for at least 50% of the regularly occupied floor area. With furniture, fixtures, and equipment in place, measure illuminance levels as follows:- Measure at appropriate work plane height during any hour between 9 a.m. and 3 p.m.
- Take one measurement in any regularly occupied month, and take a second as indicated in Table 1.
- For spaces larger than 150 square feet (14 square meters), take measurements on a maximum 10-foot (3-meter) square grid.
- For spaces 150 square feet (14 square meters) or smaller, take measurements on a maximum 3-foot (900-millimeter) square grid.
- multiple lines of sight to vision glazing in different directions at least 90 degrees apart;
- views that include at least two of the following: (1) flora, fauna, or sky; (2) movement; and (3) objects at least 25 feet (7.5 meters) from the exterior of the glazing;
- unobstructed views located within the distance of three times the head height of the vision glazing; and
- views with a view factor of 3 or greater, as defined in “Windows and Offices; A Study of Office Worker Performance and the Indoor Environment.” Include in the calculations any permanent interior obstructions. Movable furniture and partitions may be excluded. Views into interior atria may be used to meet up to 30% of the required area.
Table 1. Timing of measurements for illuminance
If first measurement is taken in … |
take second measurement in … |
|---|---|
January |
May-September |
February |
June-October |
March |
June-July, November-December |
April |
August-December |
May |
September-January |
June |
October-February |
July |
November-March |
August |
December-April |
September |
December-January, May-June |
October |
February-June |
November |
March-July |
December |
April-August |
AND/OR
Option 2. Quality Views (2 points)
Achieve a direct line of sight to the outdoors via vision glazing for 50% of all regularly occupied floor area. View glazing in the contributing area must provide a clear image of the exterior, not obstructed by frits, fibers, patterned glazing, or added tints that distort color balance. Additionally, 50% of all regularly occupied floor area must have at least two of the following four kinds of views:Performance
None.What does it cost?
Cost estimates for this credit
On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.
Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.
This information is also available in a full PDF download in The Cost of LEED v4 report.
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What is the “view factor” and how do I calculate it?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
Addenda
1/10/2020 – Updated: 1/10/2020
Reference Guide Correction
Description of change:
Campus Applicable
No
Internationally Applicable:
No
7/1/2014 – Updated: 2/14/2015
Rating System Correction
Description of change:
Under the third paragraph remove the text: "(e.g. lab hoods, fixed partitions, demountable opaque full- or partial-height partitions)".
Campus Applicable
No
Internationally Applicable:
Yes
7/1/2014 – Updated: 2/14/2015
Reference Guide Correction
Description of change:
Under the third paragraph remove the text: "(e.g. lab hoods, fixed partitions, demountable opaque full- or partial-height partitions)".
Campus Applicable
No
Internationally Applicable:
Yes
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Establishment
Option 1. Daylight Measurement (2 points)
Achieve illuminance levels between 300 lux and 3,000 lux for at least 50% of the regularly occupied floor area. With furniture, fixtures, and equipment in place, measure illuminance levels as follows:- Measure at appropriate work plane height during any hour between 9 a.m. and 3 p.m.
- Take one measurement in any regularly occupied month, and take a second as indicated in Table 1.
- For spaces larger than 150 square feet (14 square meters), take measurements on a maximum 10-foot (3-meter) square grid.
- For spaces 150 square feet (14 square meters) or smaller, take measurements on a maximum 3-foot (900-millimeter) square grid.
- multiple lines of sight to vision glazing in different directions at least 90 degrees apart;
- views that include at least two of the following: (1) flora, fauna, or sky; (2) movement; and (3) objects at least 25 feet (7.5 meters) from the exterior of the glazing;
- unobstructed views located within the distance of three times the head height of the vision glazing; and
- views with a view factor of 3 or greater, as defined in “Windows and Offices; A Study of Office Worker Performance and the Indoor Environment.” Include in the calculations any permanent interior obstructions. Movable furniture and partitions may be excluded. Views into interior atria may be used to meet up to 30% of the required area.
Table 1. Timing of measurements for illuminance
If first measurement is taken in … |
take second measurement in … |
|---|---|
January |
May-September |
February |
June-October |
March |
June-July, November-December |
April |
August-December |
May |
September-January |
June |
October-February |
July |
November-March |
August |
December-April |
September |
December-January, May-June |
October |
February-June |
November |
March-July |
December |
April-August |
AND/OR
Option 2. Quality Views (2 points)
Achieve a direct line of sight to the outdoors via vision glazing for 50% of all regularly occupied floor area. View glazing in the contributing area must provide a clear image of the exterior, not obstructed by frits, fibers, patterned glazing, or added tints that distort color balance. Additionally, 50% of all regularly occupied floor area must have at least two of the following four kinds of views:Performance
None.In the end, LEED is all about documentation. LEEDuser’s Documentation Toolkit, for premium members only, saves you time and helps you avoid mistakes with:
- Calculators to help assess credit compliance.
- Tracking spreadsheets for materials purchases.
- Spreadsheets and forms to give to subs and other team members.
- Guidance documents on arcane LEED issues.
- Sample templates to help guide your narratives and LEED Online submissions.
- Examples of actual submissions from certified LEED projects.
What is the “view factor” and how do I calculate it?The answer to this question is available to LEEDuser premium members. Start a free trial » (If you're already a premium member, log in here.) |
1/10/2020 – Updated: 1/10/2020
Reference Guide Correction
Description of change:
Under Step 2, delete the last sentence of first bullet (delete: Consider the required measurement schedule: the second measurement must be taken at least five months after the first.).
Campus Applicable
No
Internationally Applicable:
No
7/1/2014 – Updated: 2/14/2015
Rating System Correction
Description of change:
Under the third paragraph remove the text: "(e.g. lab hoods, fixed partitions, demountable opaque full- or partial-height partitions)".
Campus Applicable
No
Internationally Applicable:
Yes
7/1/2014 – Updated: 2/14/2015
Reference Guide Correction
Description of change:
Under the third paragraph remove the text: "(e.g. lab hoods, fixed partitions, demountable opaque full- or partial-height partitions)".
Campus Applicable
No
Internationally Applicable:
Yes
LEEDuser expert
Ashwini Arun
WSP
Senior Sustainability Manager
