Pamela,
With respect to #5, we generally use the following definition, as provided on the 2030 FAQ at the link below.
https://www.architecture2030.org/about/faq/#toggle-id-18
"A Major Renovation is any renovation of a building where (a) the total cost of the renovation related to the building envelope or the technical building systems is higher than 25 % of the value of the building, excluding the value of the land upon which the building is situated, or (b) more than 25 % of the surface of the building envelope undergoes renovation."
This definition is still a bit confusing to us, as the building "value" is a somewhat vague term - does that mean market value, original cost to build, cost to build it today, etc.? Ultimately we make a judgement call whether or not to include it in the DDx loosely based on this. Personally, I would not include an open-air structure or restroom, but would include a naturally ventilated building if it had a typical occupancy use type. Hope this helps and best of luck.
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Kevin Miller AIA
Architectural Nexus
Salt Lake City UT
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Original Message:
Sent: 08-25-2025 04:30 PM
From: Pamela M. da Graca AIA
Subject: Project Eligibility for DDx Reporting
Hello,
I am trying to create - or find - some guidelines to share with the project managers in my firm to help them determine which of their projects they should and should not include when reporting work to the DDx related to energy use and lighting density. We haven't made it to embodied carbon yet.
I do remember at least one discussion like this on the forum from some time back, but can't recall a resolution or find the thread so hope everyone will forgive me posing the following questions:
1) Should we include non-enclosed structures in the whole building category? Eg: pavilions with an electrical load of some lighting and perhaps a couple of convenience outlets
2) Should we include enclosed, but non-conditioned structures? Eg: naturally ventilated buildings
3) Does anyone set threshold limits? Eg: "we only report structures over 'x'sf" or other criteria which might rule out typically very low energy intensity projects (sheds, barns, restrooms, similar)
4) Has anyone tried reporting a stand-alone restroom building and, if so, what area use type did you classify it as for establishing the baseline EUI?
5) Is there a resource which defines what makes a renovation a "major renovation"? Or is that left to us to define a percentage of building area/cost value/change in energy load?
6) Have I overlooked a resource which already establishes all of these things?
Thanks to anyone who has input on any of these or can point me to what I've missed.
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Pamela da Graca AIA
The Arkitex Studio, Inc.
Bryan TX
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