Delmont Apartments
Multifamily Housing in Seattle, WA · 403 ROY ST · 98109
At a glance
Delmont Apartments is a 22,344-square-foot multifamily housing building at 403 ROY ST in Seattle, Washington, built in 1910.
Seattle Energy Benchmarking Ordinance (SMC 22.920) · reporting year 2025
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | — |
| Site EUI | — |
| Source EUI | — |
| GHG emissions | — |
| GHG intensity | — |
| Electricity | 58,666 kWh |
| Gross floor area | 22,344 sq ft |
| Source record | seattle:27656:2025 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2025latest | — | — | — | |
| 2024 | — | — | 1 tCO₂e | |
| 2023 | — | 22.8 kBtu/ft² | 19 tCO₂e | |
| 2022 | — | 26.2 kBtu/ft² | 23 tCO₂e | |
| 2021 | — | 24.5 kBtu/ft² | 21 tCO₂e | |
| 2020 | — | 27.0 kBtu/ft² | 23 tCO₂e | |
| 2019 | — | 27.8 kBtu/ft² | 24 tCO₂e | |
| 2018 | — | 29.8 kBtu/ft² | 24 tCO₂e | |
| 2017 | — | 27.8 kBtu/ft² | 24 tCO₂e | |
| 2016 | — | 25.2 kBtu/ft² | 21 tCO₂e | |
| 2015 | 100 | 25.0 kBtu/ft² | 19 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
- 403 ROY ST
- City
- Seattle
- State
- Washington
- ZIP
- 98109
- Coordinates
- 47.62517, -122.34860
Within ~1 km
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- Dexter Station Officescore 83
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See also: most efficient in Seattle · biggest emitters
How does Delmont Apartments 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.
At 22,344 sq ft, it is about 74% below the average floor area of 86,468 sq ft for those buildings. It was built in 1910, 73 years earlier 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 Delmont Apartments's energy performance changed over time?
BuildingCensus holds 11 Seattle disclosures for Delmont Apartments, covering report years 2015–2025. Site EUI moved from 25.0 kBtu/ft² (2015) to 22.8 kBtu/ft² (2023), a 9% decrease. Reported emissions went from 19 tCO₂e to 1 tCO₂e over the same span (down 95%).
Which law requires Delmont Apartments to report its energy use?
Delmont Apartments 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:27656:2025). 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
- Queens Oaks· 22,331 sq ft · score 98 (A)
- Avante Apts· 22,326 sq ft · score 91 (A)
- La Paz Apartments· 22,320 sq ft · score 78 (B)
- Grex Apts· 22,320 sq ft · score 100 (A)
- Bristol Apartments· 22,308 sq ft · score 65 (C)
- The De Selm Apts· 22,284 sq ft · score 56 (C)
- 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 Delmont Apartments's energy grade?
Delmont Apartments did not report an ENERGY STAR score in its 2025 disclosure.
How much energy does Delmont Apartments use?
No energy-use intensity was reported for 2025.
What are Delmont Apartments's carbon emissions?
No greenhouse-gas emissions figure was reported for 2025.
Where is Delmont Apartments?
Delmont Apartments is at 403 ROY ST, in Seattle, Washington 98109. Its coordinates are 47.62517, -122.34860 (latitude, longitude), as published in the Building Energy Benchmarking file.
How big is Delmont Apartments and when was it built?
Delmont Apartments has 22,344 sq ft of gross floor area, as reported in its 2025 disclosure. The disclosure lists 1910 as its year built. It is classed as multifamily housing.
Is Delmont Apartments 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, “Delmont Apartments, Seattle, Washington — 2025 benchmarking disclosure”, https://buildingcensus.com/buildings/seattle/delmont-apartments-de7786f9 (data as of October 2, 2026).