by Lauren Breckenridge, LEED AP
Sustainability Associate at Green Badger
Somewhere in California right now, a project engineer on a 55,000-square-foot tilt-up is Googling “what is a GWP limit” three weeks before a submittal deadline. Here’s how to make sure that’s not your team.
CALGreen’s embodied carbon requirements now apply to any nonresidential project of 50,000 square feet or more, down from the old 100,000 SF threshold. And while that trigger flipped for permit applications on January 1, 2026, the real crunch is happening now. Projects permitted in the first quarter are just reaching buyout, which is exactly when embodied carbon stops being a checkbox on the drawings and becomes a procurement problem: EPDs to chase, GWP limits to verify, substitutions to track.
In other words, the question isn’t “did you know the threshold changed?” It’s “Is your team set up for the projects hitting this requirement for the first time this quarter, and on every California pursuit from here on out?”
Here’s what the change actually means for your team and how to stay ahead of it.
Why the threshold dropped
This wasn’t a surprise move; the 50,000 SF trigger was baked into the code from day one as a planned second phase. Phase one kicked in on July 1, 2024, for projects of 100,000 SF and up (and schools at 50,000 SF). Phase two — everything down to 50,000 SF — was always scheduled for January 1, 2026. The state gave the industry a two-year on-ramp. Now we’re on the highway.
The key detail: applicability is based on your permit application date, not your construction start date. If your permit application went in before January 1, 2026, the old threshold applies. If it goes in now and your project is 50,000 SF or larger, you’re in.
New to embodied carbon rules entirely? Start with our breakdown of the CALGreen Title 24 embodied carbon requirements, which covers the three compliance pathways and their tiers in detail.
Who’s newly affected
The old 100,000 SF threshold mostly captured large distribution centers, big campuses, and major towers — projects that usually had a sustainability consultant on speed dial anyway.
At 50,000 SF, the rules reach a different slice of your portfolio. If your team has done LEED work, EPDs aren’t new — but until now, materials documentation was something you did on certification projects. Under CALGreen, it’s required on every qualifying project, whether the owner is pursuing a plaque or not. The suburban office building, the flex-industrial shell, the grocery-anchored retail center that never would have touched LEED, now carry the same EPD and GWP documentation burden, with the building department as your reviewer.
If that sounds like you, good news: compliance is very manageable. The catch is that you have to plan for it before buyout, not after.
One clarification worth knowing: healthcare and residential buildings aren’t simply “exempt” from Title 24. They’re fully regulated — just under their own tailored subchapters, distinct baselines, and specific carve-out exceptions. This post focuses on nonresidential projects under the base CALGreen code, which is where the 50,000 SF threshold applies.
Don’t forget local reach codes
The state code is the floor, not the ceiling. Several California cities have adopted reach codes that go beyond CALGreen’s requirements — including Berkeley, San Jose, San Luis Obispo, Santa Cruz, and Palo Alto. Depending on the jurisdiction, that can mean lower square footage triggers, tighter GWP limits, or Tier 1 and Tier 2 measures adopted as mandatory.
We won’t unpack every local ordinance here. The takeaway is simpler: never assume base CALGreen is the whole story. Confirm requirements with the local building department before you price the job.
What compliance looks like on paper
Whichever pathway your project takes (building reuse, whole building life cycle assessment, or the prescriptive EPD path), the documentation ends up in the same place: your construction documents and your closeout package.
Three things plan checkers will look for:
- Compliance calculations on the construction documents. Your design team needs to show the math — which pathway you’re using and how you meet it.
- Worksheet WS-5, signed by the design professional of record. This is the official CALGreen compliance form for embodied carbon. It’s not optional, and it can’t be an afterthought at permit submission.
- Updated EPDs at closeout. Here’s the part that lands squarely on the contractor: EPDs for the products actually installed must be provided to the owner at the close of construction and to the building department if they ask. The EPDs referenced at design might not match what your subs actually buy, so someone has to track substitutions all the way through.
Why the prescriptive path gets harder at this scale
Most mid-size projects will gravitate toward the prescriptive path — collecting EPDs for materials like ready-mix concrete, structural steel, rebar, flat glass, and mineral wool insulation, and confirming they fall under the code’s GWP limits.
Sounds simple. If you’ve ever chased EPDs from subcontractors, you know the drill: you send a friendly request, you wait, half the PDFs that come back are the wrong document, and the deadline doesn’t move. On a 100,000+ SF project, a sustainability consultant was often absorbing that pain. On a 55,000 SF tilt-up, it lands on your project engineer on top of everything else they do.
A few things make it easier: request EPDs in your subcontracts and purchase orders (not after delivery), and centralize your EPD tracking in one place so closeout isn’t a scavenger hunt. For concrete, the code offers a weighted-average exception (Equation 5.409.3.1): instead of qualifying every mix individually, the GWP-weighted average across all mixes on the project just has to come in under the allowed average — so a high-volume optimized mix can offset a specialty mix that runs hot. Our guide on how to collect EPDs without losing your mind covers the process step by step.
What to do on your next pursuit
Three questions to ask at kickoff for any California project going for permit this year:
- Is the project 50,000 SF or larger? If yes, embodied carbon compliance belongs in your budget, your schedule, and your subcontract language from day one.
- Which pathway fits? If there’s an existing structure, reuse might be your cheapest option. New construction usually comes down to WBLCA versus prescriptive EPDs — and for most mid-size teams, prescriptive is the practical answer.
- Who owns the documentation? Assign it. EPD collection that starts at buyout takes weeks. EPD collection that starts at closeout takes months you don’t have.
How Green Badger aligns with CALGreen’s documentation requirements
Embodied carbon is the newest CALGreen requirement, but it’s not the only one that generates paperwork. Look at the AIA California mandatory measures checklist, and a pattern jumps out: nearly every division ends with a documentation requirement owed to the enforcing agency. Green Badger was built for exactly that kind of tracking.
Embodied carbon (Section 5.409). Green Badger’s EPD database and GWP tracking let your team verify products against the prescriptive path limits, flag substitutions that break compliance, and assemble the closeout EPD package that the code requires you to hand to the owner.
Construction waste (Section 5.408). CALGreen requires a construction waste management plan, a minimum 65% diversion rate, and documentation “available during construction for examination by the enforcing agency.” Green Badger tracks diversion by weight in real time, so your CWM plan is a living record instead of a binder you scramble to reconstruct at final.
Low-emitting materials (Section 5.504). Adhesives, sealants, coatings, carpet systems, and composite wood all carry VOC and formaldehyde limits — and each requires product certifications or specs on request. Green Badger’s materials tracking captures that documentation at submittal, the same workflow teams already use for LEED low-emitting credits.
Verification (Section 703.1). CALGreen compliance ultimately comes down to construction documents, certifications, and inspection reports that demonstrate conformance. Keeping all of it in one platform means plan checkers, special inspectors, and owners get answers in minutes, not weeks.
If your team already uses Green Badger for LEED, the good news is that CALGreen documentation runs on the same rails.
The bottom line
The 50,000 SF threshold isn’t news anymore — but for most mid-size teams, the first project it applies to is still ahead of them. Teams that treat EPD collection like any other submittal process will barely feel it. Teams that discover Worksheet WS-5 at plan check will feel it a lot.
Request a demo to see how Green Badger automates CALGreen compliance from permit to closeout.
