Stack House Apartments (W & Se Bldgs Combined)
Multifamily Housing in Seattle, WA · 420 PONTIUS AVE N · 98109
At a glance
Stack House Apartments (W & Se Bldgs Combined) is a 391,461-square-foot multifamily housing building at 420 PONTIUS AVE N in Seattle, Washington, built in 2013. In its 2025 Seattle benchmarking disclosure it reported a site energy-use intensity of 23.7 kBtu/ft² and 78 tCO₂e of greenhouse-gas emissions.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | 23.7 kBtu/ft² |
| Source EUI | 61.6 kBtu/ft² |
| GHG emissions | 78 tCO₂e |
| GHG intensity | 0.3 kgCO₂e/ft² |
| Electricity | 1,820,114 kWh |
| Natural gas | 8,006 therms |
| Gross floor area | 391,461 sq ft |
| Source record | seattle:26080:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | 23.7 kBtu/ft² | 78 tCO₂e | |
| 2024 | 94 | +23 | 15.7 kBtu/ft² | 60 tCO₂e |
| 2023 | 71 | 29.1 kBtu/ft² | 37 tCO₂e | |
| 2022 | — | — | — | |
| 2021 | — | — | — | |
| 2020 | 98 | +1 | 37.8 kBtu/ft² | 79 tCO₂e |
| 2019 | 97 | -3 | 28.4 kBtu/ft² | 83 tCO₂e |
| 2018 | 100 | +1 | 23.7 kBtu/ft² | 34 tCO₂e |
| 2017 | 99 | +1 | 23.5 kBtu/ft² | 29 tCO₂e |
| 2016 | 98 | -1 | 23.0 kBtu/ft² | 30 tCO₂e |
| 2015 | 99 | 21.4 kBtu/ft² | 26 tCO₂e |
Compliance context
Seattle Energy Benchmarking Ordinance (SMC 22.920)
Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 420 PONTIUS AVE N
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.62245, -122.33146
Within ~1 km
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See also: most efficient in Seattle · biggest emitters
How does Stack House Apartments (W & Se Bldgs Combined) compare with other multifamily housing buildings in Seattle?
The latest disclosures cover 1,971 multifamily housing buildings in Seattle, out of 3,871 buildings citywide. Its site EUI of 23.7 kBtu/ft² is about 32% below the average of 34.9 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.3 kgCO₂e/ft² is about 63% below the group average of 0.7 kgCO₂e/ft².
At 391,461 sq ft, it is about 353% above the average floor area of 86,468 sq ft for those buildings. It was built in 2013, 30 years later than the group's average year built (1983). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has Stack House Apartments (W & Se Bldgs Combined)'s energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Stack House Apartments (W & Se Bldgs Combined), covering report years 2015–2025. Its ENERGY STAR score went from 99 in 2015 to 94 in 2024 (-5 points); its best year on file was 2018, at 100. Site EUI moved from 21.4 kBtu/ft² (2015) to 23.7 kBtu/ft² (2025), an 11% increase. Reported emissions went from 26 tCO₂e to 78 tCO₂e over the same span (up 196%).
What does a site EUI of 23.7 kBtu/ft² mean?
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. Stack House Apartments (W & Se Bldgs Combined)'s 23.7 kBtu/ft² across 391,461 sq ft works out to about 9.3 billion Btu (2,719 MWh-equivalent) in 2025. Its source EUI of 61.6 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,820,114 kWh of electricity and 8,006 therms of natural gas for the year.
Which law requires Stack House Apartments (W & Se Bldgs Combined) to report its energy use?
Stack House Apartments (W & Se Bldgs Combined) reports under the Seattle Energy Benchmarking Ordinance (SMC 22.920), the legal basis of Seattle's Building Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2025 disclosure (source record seattle:26080:2025). Seattle's Building Emissions Performance Standard (adopted 2023) applies to buildings over 20,000 sq ft: benchmarking verification is due 2027–2030 and initial emissions targets 2031–2035, reaching net zero by 2041–2050, with fines for non-compliance.
More multifamily housing buildings in Seattle
- Juxt Apartments (2017)· 391,386 sq ft · score 100 (A)
- Broadstone Lexington South· 390,855 sq ft · score 99 (A)
- Station At Othello Park· 387,971 sq ft · score 93 (A)
- Assembly118 Apts· 381,161 sq ft · score 72 (B)
- Graystone Condos· 376,935 sq ft · score 98 (A)
- Tressa Apartments 1 & 2 Combined· 375,502 sq ft · EUI 38.4 kBtu/ft²
- Multifamily Housing buildings in Seattle· 1,971 benchmarked
- All Seattle benchmarked buildings· Seattle Energy Benchmarking Ordinance (SMC 22.920)
- Most efficient large buildings in Seattle
- Least efficient large buildings in Seattle
- Biggest emitters in Seattle
Frequently asked questions
What is Stack House Apartments (W & Se Bldgs Combined)'s energy grade?
Stack House Apartments (W & Se Bldgs Combined) did not report an ENERGY STAR score in its 2025 disclosure, but its site energy-use intensity was 23.7 kBtu/ft².
How much energy does Stack House Apartments (W & Se Bldgs Combined) use?
Its 2025 site energy-use intensity was 23.7 kBtu/ft² (61.6 kBtu/ft² source) across 391,461 sq ft, including 1,820,114 kWh of electricity and 8,006 therms of natural gas.
What are Stack House Apartments (W & Se Bldgs Combined)'s carbon emissions?
Stack House Apartments (W & Se Bldgs Combined) reported 78 tCO₂e of greenhouse-gas emissions (0.3 kgCO₂e/ft²) for 2025.
Where is Stack House Apartments (W & Se Bldgs Combined)?
Stack House Apartments (W & Se Bldgs Combined) is at 420 PONTIUS AVE N, in Seattle, Washington 98109. Its coordinates are 47.62245, -122.33146 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Stack House Apartments (W & Se Bldgs Combined) and when was it built?
Stack House Apartments (W & Se Bldgs Combined) has 391,461 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 2013 as its year built. It is classed as multifamily housing.
Is Stack House Apartments (W & Se Bldgs Combined) covered by the Seattle Energy Benchmarking Ordinance (SMC 22.920)?
Yes — it appears in the 2025 Building Energy Benchmarking disclosure, which lists the buildings reporting under the Seattle Energy Benchmarking Ordinance (SMC 22.920).
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About this data
Source: Building Energy Benchmarking (Seattle Energy Benchmarking Ordinance (SMC 22.920)), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Stack House Apartments (W & Se Bldgs Combined), Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/stack-house-apartments-w-se-bldgs-combined-35467929 (data as of October 2, 2026).