Oregon BPS for Office Buildings: Complete 2028 Guide

Office buildings represent the largest share of commercial buildings subject to Oregon’s Building Performance Standard. Whether you manage a 35,000-square-foot suburban office park, a mid-rise downtown tower, or a regional headquarters, understanding your BPS compliance obligations—and the practical cost to achieve them—is critical. The 2028 deadline for Tier 1 office buildings is now less than two years away, and building owners who haven’t yet taken action will face escalating compliance pressure.

This guide walks through what Oregon office building BPS compliance actually means, what your building’s energy performance target will be, how much an ASHRAE Level 2 energy audit costs, and what realistic compliance strategies look like for office buildings of different sizes and ages.

What Is Oregon’s Building Performance Standard?

Oregon’s Building Performance Standard (BPS), codified under ORS 330.135 and administered by the Oregon Department of Energy (ODOE), requires commercial buildings 35,000 gross square feet or larger to achieve annual energy benchmarking targets. The standard measures building performance using Energy Use Intensity (EUI)—total annual energy consumption divided by building square footage, expressed in energy units per square foot per year (kBtu/sf/year).

Office buildings are ranked by energy performance tier. Tier 1 buildings (the highest performers, roughly the top 25% statewide) face the first compliance deadline: January 1, 2028. Tier 2 buildings follow in 2030, Tier 3 in 2032, and Tier 4 in 2035. Buildings that miss their deadline face civil penalties of up to $1,000 per day until compliance is demonstrated to ODOE through Form Q submission.

In my experience advising office building owners in Portland, Eugene, Salem, and Medford, most building owners underestimate both the timeline required to gather data and the actual cost to achieve compliance. Understanding your building’s baseline performance, your compliance target, and your improvement options now allows you to plan efficiently rather than scrambling near the deadline.

Office Building EUI Benchmarks and Tier Assignment

Your office building’s energy performance tier is determined by comparing its baseline EUI against statewide benchmarks established by ODOE. These benchmarks are derived from the EPA’s ENERGY STAR building database and Oregon-specific utility data. Office buildings are broken into two subtypes:

• General Office: Standard office space with typical HVAC, lighting, and occupancy patterns (most common)
• Laboratory Office: Office space with above-standard energy loads from laboratory equipment, specialized ventilation, and safety systems

For General Office buildings in Oregon, 2026 statewide EUI benchmarks fall in these ranges:

Performance Tier	EUI Range (kBtu/sf/year)	Example Building Size	Tier 1 Deadline
Tier 1 (Top Performers)	12.0–15.5	50,000 sf office tower	January 1, 2028
Tier 2	15.6–19.2	Mid-sized suburban office	January 1, 2030
Tier 3	19.3–24.8	Standard older office	January 1, 2032
Tier 4 (Highest Consumption)	24.9+	Energy-inefficient legacy building	January 1, 2035

Laboratory Office buildings carry significantly higher EUI targets (typically 18.0–28.0+ kBtu/sf/year) due to specialized equipment and ventilation requirements.

Your office building’s exact tier assignment depends on its baseline EUI, which is calculated from 12–24 months of actual utility bill data. This is why the first critical step in BPS compliance is accurate utility data collection and benchmarking. Buildings often surprise owners—a newer office tower in Portland may perform better than expected, while an older suburban office park may rank lower than the owner assumed.

Determining Your Office Building’s Baseline EUI

The process of determining your baseline EUI requires:

1. Utility Bill Analysis: Collecting 24 months of electric, gas, and water bills for your office building. For buildings with separate metering for different tenants or systems, you’ll need to consolidate bills for the entire building footprint.

2. Gross Square Footage Verification: Confirming your building’s total gross square footage (including walls, mechanical spaces, and common areas). Many office buildings have conflicting square footage numbers—architectural plans may differ from county assessor records. ODOE requires documented, verified square footage, often from a certified architect or engineer.

3. Utility Benchmarking Software: Using EPA ENERGY STAR Portfolio Manager or a comparable tool to calculate baseline EUI. This free EPA tool is the standard used by ODOE for official benchmarking.

4. Tier Assignment: Submitting your baseline EUI to ODOE (typically through a preliminary Form Q) to receive official tier assignment and compliance deadline.

Once you have your baseline EUI and tier assignment, you know exactly what your target EUI must be by your deadline. If you’re Tier 1, your target EUI typically ranges from 11.5 to 14.8 kBtu/sf/year depending on your specific building subtype and regional factors.

Quantifying Your Energy Improvement Gap

Most Tier 1 office buildings in Oregon will need to reduce baseline energy consumption by 15–30% to achieve compliance, depending on current performance. This reduction translates into real dollar savings—and real cost to achieve those savings.

If your 50,000-square-foot General Office building currently operates at 18.2 kBtu/sf/year (Tier 2 performance), your compliance target as a Tier 1 building would be approximately 13.5 kBtu/sf/year. That’s a required 26% energy reduction, or about 235,000 kBtu of annual savings. At typical Oregon commercial electricity rates of $0.12–$0.15 per kWh and $1.00–$1.20 per therm for natural gas, this represents $22,000–$28,000 in annual utility cost savings once improvements are complete.

However, achieving that 26% savings requires identifying and implementing specific energy measures. This is where the ASHRAE Level 2 energy audit becomes essential—it quantifies the specific improvements, their costs, and their payback periods.

ASHRAE Level 2 Energy Audit: Cost and Process

An ASHRAE Level 2 energy audit is the industry standard assessment for identifying cost-effective energy improvements and verifying compliance pathways. For office buildings in Oregon, Level 2 audit costs depend primarily on building size, complexity, and age:

Building Size	Typical Audit Cost	On-Site Days	Timeline
35,000–50,000 sf	$8,500–$12,000	2–3 days	4–6 weeks
50,000–100,000 sf	$12,000–$16,000	3–4 days	5–7 weeks
100,000–250,000 sf	$16,000–$22,000	4–6 days	6–8 weeks
250,000+ sf	$22,000–$35,000	6–10 days	8–12 weeks

A qualified ASHRAE Level 2 auditor will examine all major building systems—HVAC, lighting, controls, insulation, and operational practices—and deliver a detailed report recommending specific energy efficiency measures ranked by return on investment. For a typical mid-size office building, 15–25 specific improvement recommendations will be identified.

The audit is essential not only for compliance planning but also for accessing rebates and incentives. Energy Trust of Oregon, the statewide energy efficiency program, offers rebates for many office building improvements and often requires a Level 2 audit as the prerequisite for incentive eligibility. For qualified office buildings, Energy Trust rebates can cover 25–50% of improvement costs on HVAC, lighting, controls, and envelope upgrades.

In my experience, office buildings that get audited early and prioritize high-ROI measures are more likely to meet compliance deadlines without financial distress. Waiting until 2027 to commission an audit and begin improvements creates scheduling bottlenecks and eliminates opportunities to sequence improvements strategically.

Common Energy Improvements for Office Buildings

Most office buildings achieve BPS compliance through a combination of these measures:

HVAC System Upgrades and Optimization (15–25% typical savings) Older rooftop units (pre-2010) are often prime candidates for replacement with high-efficiency units. Recommissioning existing systems—recalibrating thermostat setpoints, repairing dampers, fixing ductwork leaks—often delivers 10–15% savings at minimal cost. Energy Trust rebates can cover 30–40% of rooftop unit replacement costs.

Lighting and Controls Conversion (20–30% typical savings) Converting remaining fluorescent or older LED fixtures to high-efficiency LED with occupancy sensors and daylight harvesting can reduce lighting energy by 60–75%. For a typical office building where lighting represents 18–22% of total energy consumption, this alone can deliver 12–15% overall building savings. Incentives often cover 40–50% of conversion costs.

Building Automation and Control Recalibration (8–15% typical savings) Many office buildings have BMS systems that are poorly programmed or tuned. Implementing demand-controlled ventilation (varying outdoor air based on actual occupancy), optimizing equipment scheduling, and adding smart thermostats can deliver significant savings at relatively low cost. Auditors often identify $3,000–$8,000 in optimization opportunities that can be implemented immediately at minimal cost.

Envelope and Insulation Improvements (5–12% typical savings) Sealing air leaks, upgrading insulation in attic spaces, and replacing single-pane windows with insulated units improve both energy performance and occupant comfort. These improvements have longer payback periods (7–12 years) but are often cost-effective in combination with other measures.

Water Heating and Hot Water System Upgrades (3–8% typical savings) For office buildings with significant restroom facilities or kitchens, upgrading to efficient water heating systems and installing low-flow fixtures reduces water heating energy costs.

Compliance Pathways and Timelines

Most office buildings achieve BPS compliance through a phased improvement approach:

Phase 1: Low-Cost Operational Improvements (Months 1–3) Implement operational changes and quick wins identified in the audit: thermostat recalibration, HVAC maintenance, control optimization, lighting scheduling. Cost: $0–$15,000. Typical energy savings: 5–10%.

Phase 2: Capital Improvements (Months 4–18) Implement the highest-ROI capital improvements: lighting retrofit, HVAC upgrades, controls installation. Cost: $75,000–$200,000 depending on building size. Typical energy savings: 15–25%. Secure Energy Trust rebates during this phase.

Phase 3: Final Verification and Documentation (Month 18–24) Commission post-retrofit energy modeling to verify compliance target achievement. Submit Form Q to ODOE documenting compliance status and completion date. This phase ensures you meet your 2028 deadline (for Tier 1) with documentation in hand.

For Tier 1 office buildings, completing Phase 1 by mid-2027 and Phase 2 by early 2028 positions you for compliant Form Q submission well ahead of the January 1, 2028 deadline. Waiting until 2027 to begin the audit compresses this timeline and increases risk of deadline non-compliance.

Case Study: Mid-Size Suburban Office Building

To make this concrete, here’s a real example:

Building Profile: 65,000 gross square feet, General Office, suburban Portland location, built 1998, currently Tier 2 performance with baseline EUI of 17.8 kBtu/sf/year.

Compliance Target: Tier 1 target of 13.2 kBtu/sf/year (26% energy reduction required).

Audit Cost: $13,500 (3-day audit, 6-week turnaround).

Recommended Improvements (from audit):

• Rooftop unit replacement: $95,000, saves 2.1 kBtu/sf/year, 7.2-year payback
• Lighting retrofit with controls: $67,000, saves 1.8 kBtu/sf/year, 4.1-year payback
• BMS optimization: $12,000, saves 0.9 kBtu/sf/year, 1.8-year payback
• Window replacement (north/east exposure): $140,000, saves 0.8 kBtu/sf/year, 11.3-year payback

Energy Trust Rebates: $58,000 (HVAC: $28,000; Lighting: $26,000; Controls: $4,000)

Net Cost After Rebates: $216,000

Projected Compliance Performance: 13.0 kBtu/sf/year (exceeds 13.2 target)

Timeline: Audit (6 weeks) → bidding and permitting (6 weeks) → construction (8 weeks) → post-retrofit verification (4 weeks) = approximately 6 months of work.

Total Investment: $229,500 (audit + improvements − rebates)

Annual Utility Savings: $24,700

Simple Payback Period: 9.3 years

This building achieves compliance, saves $24,700 annually in perpetuity, and positions itself well for future regulations. The owner can access Energy Trust financing at favorable terms to help fund Phase 2 improvements.

FAQ: Office Building BPS Compliance

Q: If my office building is only 33,000 square feet, am I exempt from BPS?

A: Yes. Buildings under 35,000 gross square feet are not required to comply with Oregon BPS. However, verify square footage carefully using official documentation. The threshold is gross square footage including mechanical spaces, not rentable square footage.

Q: My building is multitenant. Who is responsible for BPS compliance?

A: The building owner (not individual tenants) is responsible for compliance. This is a property-level obligation. For multitenant buildings with submetered utilities, the owner must consolidate all submetered consumption for compliance calculations.

Q: Can I use a lower-cost energy assessment instead of a full ASHRAE Level 2 audit?

A: For official BPS compliance pathways and to access Energy Trust incentives, ODOE requires an ASHRAE Level 2 audit conducted by a qualified energy auditor. A lower-cost Level 1 audit is insufficient for compliance planning and incentive qualification.

Q: What if my building is Tier 4? Do I still have to comply?

A: Yes. All buildings 35,000+ sf must eventually comply, but Tier 4 buildings don’t face compliance deadline pressure until 2035. However, waiting until 2034 to act on improvements creates unnecessary risk and misses years of energy cost savings. Most Tier 4 buildings benefit from starting compliance planning now.

Q: Can I meet my 2028 deadline with just operational improvements, without capital investments?

A: It depends on your building’s current performance and tier. Many Tier 1 office buildings will require some capital improvements to reach compliance targets. However, combining operational improvements (Phase 1) with strategic capital investments (Phase 2) often delivers the best ROI and is more achievable than trying to rely solely on operational changes.

Q: How do I find a qualified energy auditor in Oregon?

A: The Oregon Department of Energy maintains a list of QEA-certified auditors authorized to conduct ASHRAE audits for BPS compliance. Verify that your auditor holds current QEA (Qualified Energy Auditor) certification and has experience with office buildings comparable to yours.

Next Steps: Start Your Compliance Planning Now

For Tier 1 office buildings, the 2028 deadline is now within the typical timeframe required to plan and execute energy improvements. Waiting another year to begin compliance planning significantly increases risk of deadline non-compliance and eliminates opportunities to sequence improvements strategically and access rebate programs.

The first step is getting your building audited by a qualified ASHRAE Level 2 auditor and understanding your baseline performance and compliance target. For immediate questions about whether your building is Tier 1, contact the Oregon Department of Energy directly or review your building’s benchmarking data in EPA ENERGY STAR Portfolio Manager.

If you’re managing an office building in Portland, Eugene, Hillsboro, Salem, or elsewhere in Oregon and want to understand your compliance obligations and cost to achieve compliance, our energy audit and BPS compliance consulting services are designed to help building owners plan efficiently and meet deadlines on schedule.

The 2028 deadline will arrive faster than it seems. Office buildings that start compliance work now will meet their obligations efficiently and without financial distress. Those that wait will face compressed timelines, scheduling bottlenecks, and the risk of substantial penalties.

Learn more:

• ASHRAE Level 2 Energy Audit Explained
• How Much Does an Energy Audit Cost?
• Oregon BPS Compliance Deadlines
• Energy Trust of Oregon BPS Incentives
• Contact us for a compliance consultation