# Seattle BEPS Compliance Guide: 2027 GHG Verification, 2031 GHGI Caps & WA CBPS

> Canonical URL: https://bcesg.org/seattle-beps-building-emissions-performance-standard-guide/
> Jurisdiction: Seattle, WA | Status: Live (Annual Benchmarking Active · 2027 GHG Verify >=90k · 2031 GHGI Caps) | Reviewed: 2026-11-14

**Short answer:** Commercial and multifamily landlords inside Seattle city limits face layered municipal and state mandates. Alongside annual Portfolio Manager disclosures under SMC § 22.920, Seattle's [Building Emissions Performance Standard (BEPS, SMC § 22.925 / Ord. 126973)](https://www.seattle.gov/environment/climate-change/buildings-and-energy/building-emissions-performance-standard) subjects non-residential and multifamily buildings **>20,000 sq ft** to emissions verification beginning in **2027 (>=90,000 sq ft wave)** and stepped **GHGI (greenhouse gas intensity)** limits starting in **2031** through net-zero 2050.

Crucially, complying with Seattle BEPS does NOT exempt a building from [Washington State's Clean Buildings Performance Standard (CBPS)](https://bcesg.org/washington-clean-buildings-performance-standard-cbps-guide/) — and meeting WA CBPS's energy-efficiency Site EUI rule does not automatically satisfy Seattle BEPS's fossil-fuel decarbonization schedule. Clean Seattle City Light hydroelectric power keeps electric buildings' carbon intensity low, spotlighting gas space heating and service water systems as the primary Seattle compliance risk.

### Statutory Status at a Glance
- **Covered Scope (>20,000 sq ft):** Non-residential commercial and multifamily residential buildings >20k heated/conditioned floor area (excluding manufacturing/industrial per OSE definitions).
- **Staggered Cohorts (2027–2050):** Wave 1 (>=90k sf) opens GHG reporting/verification in 2027 with Cycle 1 GHGI caps in 2031–2035; smaller 50k–90k and 20k–50k cohorts follow through 2050.
- **Annual Benchmarking Remains Active:** SMC § 22.920 Portfolio Manager reporting continues annually every spring/summer (~May 1 / June 1 OSE schedule).
- **Flexibility Options:** Standard building-type GHGI limits, portfolio averaging, alternative compliance payments, and decarbonization extensions for equipment replacement constraints.

## Coordinating Seattle BEPS Carbon Limits With WA CBPS Site EUI Targets

Seattle City Light supplies predominantly hydroelectric grid electricity, giving Seattle properties a dramatically lower electric emission factor than fossil natural gas or steam heat. As a result, a building running electric resistance boilers might struggle to meet Washington State CBPS's kBtu/sq ft Site EUI target while easily clearing Seattle BEPS's 2031–2035 GHGI ceiling — whereas an efficient condensing-gas building could pass WA CBPS early while facing escalating Seattle carbon gaps through 2040.

Owners preparing CY2026 utility baselines ahead of 2027 third-party GHG verification should audit submeter splits between tenant retail and multifamily domestic hot water plants before selecting heat-pump conversions or compliance extensions.

- **Verify Dual Reporting Timelines:** Keep Washington Commerce CBPS Tier 1 (>=50k sf 2026–2028) milestones aligned alongside Seattle's 2027 (>=90k sf) verification kickoff.
- **Multifamily Early Prep:** Unlike WA CBPS Tier 1 (commercial-focused until Tier 2 benchmarking), Seattle BEPS places multifamily >20,000 sq ft directly on a net-zero emissions path.

| Obligation & Code | Covered Floor Area | Key 2026–2031 Timeline | Primary Compliance Metric |
| --- | --- | --- | --- |
| Seattle Benchmarking (SMC 22.920) | Nonres & multifamily >20,000 sf | Annual spring/June Portfolio Mgr | Whole-building Site EUI + ENERGY STAR |
| Seattle BEPS (SMC 22.925) | Nonres & multifamily >20,000 sf | 2027 GHG verify (>=90k); 2031 caps | GHGI (kgCO2e/sf) to net-zero 2050 |
| WA State CBPS Overlay | Tier 1 >=50k nonres; Tier 2 >=20k/multi | 2026–2028 Tier 1; 2027 Tier 2 | Weather-normalized Site EUI + EMP/O&M |

![Timeline comparing Seattle BEPS (>20,000 sq ft, 2027 GHG reporting, 2031–2050 GHGI net-zero caps) alongside Washington State CBPS Site EUI rules.](https://bcesg.org/wp-content/uploads/2026/11/infographic-seattle-beps.png)

## Compliance Execution Checklist

| Step | Owner / Team | Auditable Deliverable |
| --- | --- | --- |
| 1. Cohort Confirmation | Compliance / Legal | Confirm property gross sq ft tier (>90k vs 50k–90k vs 20k–50k) under OSE rules. |
| 2. Dual Utility Feed Audit | Property Ops | Lock Seattle City Light & Puget Sound Energy PM aggregation prior to spring close. |
| 3. Fuel-Switching CapEx | Engineering / Asset Mgmt | Model heat-pump / domestic hot water electrification to satisfy GHGI + Site EUI together. |

## Frequently Asked Questions

### Does complying with Washington's statewide CBPS satisfy Seattle BEPS?

No. Washington State CBPS regulates energy consumption (Site EUI) whereas Seattle BEPS (SMC § 22.925) caps carbon emissions intensity (GHGI) toward net-zero 2050 and covers multifamily properties >20,000 sq ft.

### When do Seattle BEPS requirements start taking effect?

Annual energy benchmarking under SMC § 22.920 is active now, third-party GHG reporting begins in 2027 for buildings >=90,000 sq ft, and mandatory 5-year GHGI emissions limits start in 2031.

## Primary Authorities & Official Resources

- [City of Seattle OSE — Building Emissions Performance Standard (BEPS)](https://www.seattle.gov/environment/climate-change/buildings-and-energy/building-emissions-performance-standard)
- [Washington State CBPS Guide (Dual-Metric Context)](https://bcesg.org/washington-clean-buildings-performance-standard-cbps-guide/)

*Informational notice: This guide summarizes enacted statutes, regulations, or pending legislative records from the primary authorities linked above as of November 14, 2026. It is not legal, accounting, or licensed engineering advice.*