Colorado Regulation 28 performance deadline: December 31, 2026 for buildings 100,000+ sq ft. Start your audit →
Colorado Building Compliance

Knowledge Base

Colorado Building Compliance Resources

Practical guides on Regulation 28, energy auditing, compliance pathways, and Colorado energy incentives. Written for building owners and property managers, not engineers.

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Compliance Guide April 24, 2026

Regulation 28 Pathway 4: Using Renewable Energy Credits and Solar for BPC Compliance

How Colorado building owners can use on-site solar, RECs, green tariff programs, and virtual PPAs to satisfy Regulation 28 Pathway 4 building performance compliance by 2030.

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Compliance Guide April 21, 2026

What to Expect from a Building Energy Audit for Regulation 28 Compliance

What an ASHRAE Level 2 energy audit covers, what it costs, how long it takes, and how to find a qualified auditor in Colorado for Regulation 28 / BPC compliance under Pathway 2.

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Compliance Guide April 16, 2026

Colorado Regulation 28 Penalties: What Happens If You Don't Comply

A clear breakdown of Regulation 28 penalty exposure for non-compliant Colorado buildings — civil penalties, enforcement timeline, the variance process, and what CDPHE can actually do starting in 2030.

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Compliance Guide April 14, 2026

How to Benchmark Your Colorado Building in ENERGY STAR Portfolio Manager

Step-by-step guide to setting up ENERGY STAR Portfolio Manager, entering energy data, and submitting your annual benchmarking report to CDPHE under Colorado Regulation 28.

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Incentives & ROI February 5, 2025

Colorado Energy Incentives for Regulation 28 Compliance

Xcel Energy, Black Hills Energy, Colorado C-PACE, and CEO grants available to Colorado building owners pursuing Regulation 28 compliance. Dollar amounts and eligibility details.

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How-To Guide January 22, 2025

Regulation 28 Compliance Pathways: Which One Is Right for Your Building?

Colorado Regulation 28 offers four compliance pathways. This guide compares EUI targets, GHG reductions, and real-world scenarios to help building owners choose correctly.

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Compliance Guide January 10, 2025

Colorado Regulation 28 Explained: What Building Owners Need to Know

A plain-English breakdown of Colorado Regulation 28 (5 CCR 1001-32): what buildings are covered, the compliance deadlines, pathway options, and what happens if you miss it.

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Quick Regulation 28 Answers

When is the Regulation 28 benchmarking deadline?
Starting in 2026, the annual benchmarking report is due November 1 each year. Buildings must submit energy use data through ENERGY STAR Portfolio Manager or an equivalent tool approved by CDPHE.
Does Regulation 28 apply to all Colorado buildings?
No. Regulation 28 applies specifically to commercial, multifamily residential, and public buildings at or above 50,000 square feet. Buildings below that threshold are not currently covered by the mandate.
What is the Colorado Energy Office's role in Regulation 28?
The Colorado Energy Office (CEO) provides technical assistance, compliance resources, and coordinates with building owners and utility partners. Actual enforcement authority sits with the CDPHE Air Quality Control Commission.
Can Colorado C-PACE financing help with Regulation 28 improvements?
Yes. Colorado's Commercial Property Assessed Clean Energy (C-PACE) program allows building owners to finance energy efficiency and renewable energy improvements through a property assessment — meaning no upfront capital required. Improvements identified in your audit are often C-PACE eligible.