About CalgreenCX
Built on expertise. Driven by results.
For over 18 years, CalgreenCX has partnered with California government agencies to deliver rigorous commissioning oversight and LEED certification management — on time, on budget, and to the highest technical standard.
Our mission
Advancing sustainable, high-performance buildings for California's public sector.
We exist to close the gap between design intent and operational reality. Every system we commission, every certification we manage, and every report we deliver is grounded in one commitment: buildings that perform as promised — for the agencies that own them and the communities that depend on them.
How we got here
CalgreenCX was founded in 2006 by a team of licensed mechanical engineers who saw a persistent problem in California public construction: buildings that earned certifications on paper but underperformed in practice.
We built our practice around independent verification — third-party commissioning that holds every system accountable to its design specifications, not just its permit drawings. Over time, that reputation for rigor attracted larger and more complex government projects.
Today we operate across the full project lifecycle, from pre-design energy modeling through post-occupancy performance verification, serving school districts, municipal utilities, transit agencies, and state departments throughout California.
Our values
What guides our work
Technical rigor
We verify every system against its design intent. No shortcuts, no assumptions — only documented, defensible results.
Public accountability
Government projects are funded by taxpayers. We treat every dollar of public money with the same scrutiny we apply to every BTU.
Independent perspective
As a third-party commissioning authority, our loyalty is to the owner — not the contractor, not the design team, not the schedule.
Continuous learning
LEED standards evolve. California energy codes evolve. We invest in ongoing education so our clients always benefit from current best practice.
Our team
The people behind the work
Sandra Reyes, PE, CxA
Principal & Commissioning Authority
Sandra leads all commissioning engagements and has overseen more than 120 government building projects since founding the firm. She holds a PE license in mechanical engineering and is a certified commissioning authority.
Marcus Tran, LEED AP
Director of LEED Services
Marcus manages LEED documentation and certification strategy for all active projects. He has guided 60+ projects through LEED Gold and Platinum certification under LEED v4 and v4.1.
Priya Nair, EIT
Senior Commissioning Engineer
Priya specializes in HVAC and controls commissioning for large institutional facilities. She brings deep expertise in BAS integration, functional performance testing, and energy measurement and verification.
James Okafor, PE
Energy & Retro-Commissioning Lead
James leads all retro-commissioning and energy audit engagements. His work has identified over $4M in annual energy savings across California school districts and municipal facilities.
Firm credentials
Ready to work with California's commissioning experts?
Whether you're planning a new government facility or need retro-commissioning on an existing building, our team is ready to help.