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NC-v4 EAp2:Minimum energy performance

ASHRAE 90.1 mandatory requirement for daylight dimming not met in many projects

Hi,

We have been facing this problem on each and every new project in the region.

There are multiple LEED certified projects in the region (Middle East) where spaces quality for daylight dimming sensors as per ASHRAE 90.1 mandatory requirements but they are not desgined or installed.

On some projects, reviewers comments are recieved that energy model should reflect the penalty by not modelling the daylight dimming sensor in proposed and modelling them in the Baseline. This approach was accepted on project by project basis.

However no interpretation exists for this approach. From the guides to the Forums, everywhere its clearly mentioned that if space qualifies, daylight sensors are mandatory requirements to be incoporated in the proposed design.

Based on the past projects, we are getting a lot of pushback from design teams on this on every new project. They have done some project in the past which is certified without daylight dimming sensors and want to do same for all the projects.

Do we have any clear guidance on this ? Either this should be mandatory on all the projects or energy modelling penalty approach should be accepted for all the projects.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 12/08/2025 - 20:20

The guidance is very clear on this. Projects are required to adhere to all mandatory provisions. Since these requirements are mandatory, LEED has granted an exception to meeting the mandatory provision that allows projects to take an energy penalty by modeling these requirements in the baseline. It is possible that individual reviewers did not enforce or missed this on a project here and there. They are human after all. There is definitely no except that allows projects to ignore this mandatory provision. So it is mandatory and the exception granted is the modeling penalty approach. The same holds true for the plug load controls mandatory provision. I thought this was in a LEED Interpretation but I could not find it quickly.

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