Washington State's Clean Buildings Act (HB 1257) sets mandatory energy efficiency targets for commercial buildings. Deadlines begin June 1, 2026. This guide covers everything property managers and building owners need to know to achieve compliance and avoid penalties.
Washington State's Clean Buildings Act, enacted in 2019 as House Bill 1257, establishes the Clean Buildings Performance Standard (CBPS) — the most comprehensive building energy efficiency law in the Pacific Northwest. The law requires privately owned commercial buildings above 50,000 square feet to meet mandatory Energy Use Intensity (EUI) targets specific to each building type.
The Washington State Department of Commerce administers the program, setting EUI benchmarks calibrated to the 25th percentile of national energy performance for each building category. Simply put, your building must perform at least as well as the bottom quarter of similar buildings nationwide — a threshold most well-maintained buildings can meet with targeted improvements.
Unlike voluntary programs such as ENERGY STAR certification, CBPS compliance is legally required. Building owners who miss their deadline face escalating financial penalties, and non-compliance is tied to building permits and future transactions. Starting the process early is far less expensive than paying penalties or scrambling for last-minute compliance.
The CBPS establishes two tiers based on building size, with phased deadlines within Tier 1. Determine your tier and confirm your deadline below.
| Tier | Building Size | Compliance Deadline | Status |
|---|---|---|---|
| Tier 1 — Phase 1 | Greater than 220,000 SF (nonresidential / hotel / motel / dorm) | June 1, 2026 | Immediate action required |
| Tier 1 — Phase 2 | 90,001 – 220,000 SF | June 1, 2027 | Begin benchmarking now |
| Tier 1 — Phase 3 | 50,001 – 90,000 SF | June 1, 2028 | Start planning |
| Tier 2 | 20,001 – 50,000 SF (all types); multifamily ≥ 50,000 SF | July 1, 2027 | Begin benchmarking now |
Square footage is measured as gross square footage of the entire building, including all heated and cooled spaces. If you own multiple buildings on a single parcel, each building is assessed individually. Mixed-use buildings containing both commercial and residential space generally apply the predominant use type for the EUI target.
Compliance is demonstrated by submitting a full calendar year of energy data through ENERGY STAR Portfolio Manager. For the June 2026 deadline, that means your 2025 energy data must show performance at or below the applicable EUI target.
Each building type has a specific maximum EUI target. Your building must meet or beat this number to comply. Lower EUI = better energy performance.
| Building Type | EUI Target (kBtu/SF/yr) — Zone 4C¹ | Notes |
|---|---|---|
| Office | 63 – 66 | Administrative/Professional: 63; Government/Other: 66. Medical office: 60 |
| Retail Store | 68 | Excludes grocery / food service |
| K–12 School | 49 | Elementary; high school: 48 |
| Multifamily Residential | 32 | Common areas and whole-building consumption |
| Warehouse / Distribution | 36 | Nonrefrigerated; refrigerated: 121 |
| Hospital / Acute Care | 215 | Operations-intensive use type |
| Hotel / Motel | 68 | All full-service hotel types |
| College / University | 102 | Varies by research intensity; lab-heavy campuses may qualify for adjustments |
¹ Zone 4C = Western Washington (Seattle / Tacoma area). Zone 5B = Eastern Washington (Spokane area) targets are slightly higher for most building types. The full 113-type table with both climate zone columns is published in Table 7-2a of the WA Commerce CBPS standard.
Washington's CBPS offers three routes to compliance. The right path depends on your building's current performance, capital budget, and timeline.
Demonstrate that your building's actual annual EUI meets or beats the target for your building type. This is achieved through energy efficiency improvements: lighting upgrades, HVAC optimization, building controls, envelope improvements, or operational changes.
Implement a defined set of required energy efficiency measures without needing to demonstrate an EUI improvement. This path may be available when the performance path is not achievable within the compliance period due to capital constraints or technical limitations.
Pay a fee to the state in lieu of meeting the EUI target. The fee structure is designed to be more expensive than making the actual improvements — so this option is not financially advantageous in most cases and does not address underlying energy costs.
Missing your compliance deadline is not a paperwork issue — it carries significant and escalating financial consequences.
Penalties are assessed and collected by the Washington State Department of Commerce. Non-compliance may also affect building permit applications and is likely to become a material disclosure item in real estate transactions — affecting property value and marketability.
The cost of proactive compliance — benchmarking, gap analysis, and targeted energy improvements — is almost always a fraction of the penalties for non-compliance, and comes with the added benefit of permanently lower operating costs.
Washington CBPS requires involvement from a Qualified Energy Manager (QEM) or qualified professional at key stages. Here is what the full compliance engagement looks like.
Set up your building in Portfolio Manager, collect 12 months of utility data for all energy sources (electricity, natural gas, steam, etc.), and establish your baseline EUI. Tenant data collection and landlord-metered space reconciliation are handled at this stage.
Compare your building's current EUI against the statutory target. If your building already meets the target, we document compliance and prepare the required report. If there is a gap, we quantify it and identify which end uses are driving excess consumption.
Evaluate the performance path, prescriptive path, and alternative compliance payment against your building's capital budget, lease structure, and timeline. Recommend the optimal path with a clear cost-benefit analysis.
Identify and prioritize energy efficiency measures with the best return on investment. Coordinate with your facilities team or contractors. For eligible measures, identify utility incentive programs (PSE, Puget Sound Energy, Avista, Seattle City Light, etc.) to offset project costs.
Prepare and submit the annual compliance report to the Washington Department of Commerce. Monitor your building's ongoing EUI to maintain compliance year over year, and flag any operational changes that could affect performance.
Green Check Solutions specializes in exactly this work — practical, cost-focused compliance support for commercial building owners across Washington State.
John Slagboom holds the Certified Energy Manager (CEM) credential and meets Washington State's Qualified Energy Manager requirements for CBPS compliance reporting.
Over a decade working directly with commercial building portfolios — office, retail, multifamily, industrial — across the Pacific Northwest and nationally.
All benchmarking, analysis, and reporting is handled remotely. No site visits required in most cases, no disruption to tenants or operations. Fast turnaround.
We often identify utility billing errors and tax exemptions that offset the cost of compliance work entirely. If we don't find savings, you pay nothing for that service.
We translate regulatory requirements into a clear action plan with specific costs, timelines, and ROI. No jargon, no unnecessary complexity — just a path to compliance.
Washington's major utilities offer substantial incentives for qualifying energy improvements. We identify and help you capture every available rebate to reduce your net project cost.
Answers to the questions we hear most often from building owners and property managers navigating the Washington Clean Buildings Act.
Find out where your building stands, what it will take to comply, and how much it will cost — before your deadline arrives. No obligation, no jargon.
