For Part 5b, remove: "Project develops a plan to upgrade current mercury-containing lamp". Add: _“Project does not install any lamps not compliant with the low-mercury limits specified in Appendix C, Table A5. Project develops a plan to upgrade any existing non-compliant lamps to low-mercury or mercury-free lamps.”

In part description, remove: "following guidelines". Add: "below guidelines, and a policy is put in place for future work"

Add: "and Policy Document" after "Remediation Report"

In feature background, remove: "(Please refer to Table A3 for additional details.)"

The Dutch Working Conditions Legislation (including the Decree, Act, and Regulation) has been approved as an alternative to AHERA for Feature 11, Part 3. Note that projects must maintain a copy of the records produced by the asbestos investigator/abatement contractor, which should be made available to the building occupants.

S.I. 386/2006, 589/2010, and 291/2013 have been accepted as an equivalent for AHERA and 40 CFR part 763 of Feature 11 Part 3. Note that inspection by an accredited professional is conducted every three years.

Remove: "Not more than 100 ppm (by weight) added lead". Add: "Not more than a weighted average of 0.25% lead in wetted surfaces of pipes, pipe fittings, plumbing fittings, and fixtures, and 0.20% for solder or flux used in plumbing for water intended for human consumption"

The New York Department of Environmental Protection Asbestos Control Program and Asbestos Rules and Regulations has been approved as an equivalent to AHERA for Feature 11, Part 3.
Note that projects must maintain a copy of the records produced by the asbestos investigator/abatement contractor, which should be made available to the building occupants.

Add MEP Letter of Assurance as required documentation.

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To limit the potential for bacteria and mold growth within buildings from water infiltration and condensation.'

In system diagram, add: "Immune" to list under diagram of body system

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To remediate construction-related indoor air contamination.'

NEN-EN 13829 has been accepted as an equivalent for ASHRAE Guideline 0-2005 and the NIBS Guideline 3-2012 of Feature 14 Part 1 and 2.

In 26 Jul, 2017 Equivalency, remove: "Thernal". Add: "Thermal"

Previously published as AAP:
The ISO 9972-2015 - Thermal performance of buildings - Determination of air permeability of buildings - Fan Pressurization method is an acceptable alternative to meet WELL Feature 14 Part 1a.

Previously published as AAP:
In lieu of performing envelope commissioning in accordance with ASHRAE Guideline 0-2005 and NIBS Guideline 3-2012 for new construction or structural renovation), the project may complete a thermographic survey, airtightness test, and inspection and correction of defects in accordance with ATTMA TSL2 guidelines.

CIBSE Guide A is not accepted as an alternative to the requirements of Feature 15 Part 1. Note that the ventilation rates specified are generally not 30% above those required in ASHRAE 62.1-2013.

Remove: "Exceed ASHRAE outdoor air supply rates met in the WELL Ventilation Effectiveness feature by 30%". Add: "Exceed outdoor air supply rates met in Feature 03, Part 1a by 30%".

CEN Standards EN 15251:2007 and EN 16798-3:2017 may be used in lieu of ASHRAE 62.1-2013 for Feature 15, Part 1. ​​​​

The project must meet Category I ​or II​ (described in Table 1)​ and must calculate the ventilation rate based on ​either of the below calculation methods​,​ referenced in EN 15251: 2007​, ​section B.1.3​ ""Method based on ventilation rate per person or per m² floor area​:"" ​
​1​) the addition of the ​occupant and building ​values ​(see section B.1.2).
2​) the highest value (maximum of the calculated value based on per person and the value based on per m² floor area from Table B.3).

​Additionally, the requirements of CEN Standard EN 15251-2007 must be met and the performance requirements of CEN Standard EN 16798-3:2017 related to ventilation and room conditioning systems must be met (excluding section 7.3, Thermal Environment; section 7.6, Acoustic Environment; section A.16; and section A.17).

AS 1668.2 may be used in lieu of ASHRAE 62.1 for Feature 15, Part 1. Note that projects that wish to comply with AS 1668.2 must increase ventilation by 50% rather than the 30% increase required when complying with ASHRAE 62.1.

In Part 1, change "The following is required in terms of the rate of fresh air supply to all regularly occupied spaces:" to "The following is required in terms of the rate of outdoor air supply to all regularly occupied spaces:"

In part description, remove: "locker rooms". Add: "changing rooms"

Projects situated in countries where local or regional standards do not pose strict requirements for relative humidity control (e.g. EN-15251) cannot earn points by not complying with the requirements of Feature 16, Part 1. Projects without dehumidification or humidification systems may earn points through Part 1b.

Are closed from adjacent spaces, such as by using with self-closing doors.

In part title, remove: "Locker Rooms". Add: "Changing Rooms". In part description, remove: "Locker rooms". Add: "Changing rooms"

Under Part 1, change the beginning of the first line to 'All cleaning and chemical storage units, all bathrooms and all rooms that contain printers and copiers…"

Add annotated mechanical and architectural drawing as required documentation, remove MEP Letter of Assurance, remove on-site spot checks.

For Part 2a, remove: "the Air Quality Standards feature". Add: "Part 1: Indoor Air Monitoring"

Add: "(measured at 1.2-1.8 m [4-6 ft] above the floor)" after "once an hour"

The requirements of Part 3 (Environmental Measures Display) may be met by hosting the required data on a website accessible to occupants and in locations where the physical display would be located, placing signage indicating the website where the data may be accessed.

Add on-site spot checks as required verification.

In 27 Apr, 2017 AAP, remove: "tenant space" after "a. Must be directly accessible from the". Add: "project"

For Feature 19, Part 1, a dedicated outdoor terrace can be provided. The terrace must satisfy the following requirements:
a. Must be directly accessible from the project
b. Must have seating for a minimum of 15% of the total regular project occupants
c. Must be adequately shaded to allow occupants to perform their work without significant glare
d. Feature 19, Part 2 and Part 3 must be addressed

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To increase the supply of high quality outdoor air and promote a connection to the outdoor environment by encouraging occupants to open windows when outdoor air quality is acceptable.'

Add Architect Letter of Assurance as required documentation, remove annotated architectural drawing.

Add Owner Letter of Assurance as required documentation, remove Architect Letter of Assurance.

For Part 1, remove: "Dedicated outdoor air systems are used for heating and/or cooling systems". Add: "Dedicated outdoor air systems are used for ventilation"

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To allow buildings to control the outdoor air supply independently from the heating/cooling needs of the building.'

REHVA Guidebook No. 1 (Displacement Ventilation in non-industrial premises) may be used in lieu of the System Performance Evaluation and ASHRAE Guidelines RP-949 for Feature 21, Part 1.

Replace “One of the following is met for projects implementing a displacement ventilation system for heading and/or cooling:” with “Projects implement a displacement ventilation system for heating and/or cooling in which one of the following is met:”

For Part 1c, add: "(except paper recycling bins)" after "cans"

Remove: "Inspections". Add: "Visual inspections during performance verification"

Change Part 1 verification type from Visual Inspection to Operations Schedule and Spot Check.

In introduction language, remove "and furniture be covered in washable covers" from the last sentence in the second paragraph. The last sentence becomes: "To minimize allergenic pests, this feature requires that pest inspections be conducted regularly and food be stored and sealed."

For Part 1a, add: "or combination particulate/carbon filters" after "Activated carbon filters"

In part description, remove: "(whether primary or back-up) must meet" after "...heating or power generation". Add: "(including back-up if used more than 200 hours per year) meets"

Add: "for construction occurring within one year prior to Performance Verification:" after "...the following requirements are met"

The emission standards of Central Pollution Control Board (Government of India) has been accepted as an alternative for California’s South Coast Air Quality Management District rules for pollution in Feature 24 Part 2.
However, combustion equipment for which there are no CPCB emission standards must meet California’s South Coast Air Quality Management District rules for pollution.
This equivalency may only be used for projects in India.

The following European local emission standards have been approved as an acceptable equivalent for Feature 24, Part 4:
1. European Stage IV standard for non-road diesel engine vehicles or the use of non-road diesel engine vehicles equipped with diesel particulate filters (DPF).
2. Euro VI emission standards for on-road engine vehicles or the use of on-road diesel engine vehicles equipped with diesel particulate filters (DPF).

The following standards have been approved as an acceptable alternative for F24, Part 4:
1. China standard GB20891-2014 for non-road diesel engine vehicles
2. China standard GB17691-2005 for passenger vehicles and heavy duty trucks
Note that that NOx limits in the China standards are higher then US EPA limits.
This Equivalency may only be used for projects in China.

Add Owner Letter of Assurance as required documentation, remove Architect Letter of Assurance.

d. Sound Duct, pipe, acoustic and thermal insulation.

Global GreenTag Standard v4.0 and PhD Methodology have not been accepted as an alternative for the requirements of Feature 25 Part 2, 3, 4 and 5.

Products certified under Good Environmental Choice Australia (GECA) Furniture & Fittings (Level B) (FF v3.0-2017) standard have not been accepted as alternatives for the requirements of Feature 25 Part 3.
Note that this GECA standard does not account for all the phthalates stated in this requirement.