Aegis West Seattle

How does Aegis West Seattle compare with other senior living community buildings in Seattle?

The latest disclosures cover 48 senior living community buildings in Seattle, out of 3,871 buildings citywide. Aegis West Seattle's ENERGY STAR score of 98 compares with an average of 72 across the 40 that report a score; it scores higher than 85% of them and lower than 10%. Its site EUI of 37.3 kBtu/ft² is about 44% below the average of 66.7 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 0.2 kgCO₂e/ft² is about 87% below the group average of 1.7 kgCO₂e/ft².

At 78,232 sq ft, it is about 43% below the average floor area of 136,458 sq ft for those buildings. It was built in 2018, 27 years later than the group's average year built (1991). Across all 24 jurisdictions BuildingCensus covers, the 1,181 senior living community buildings average an ENERGY STAR score of 71 and a site EUI of 73.6 kBtu/ft².

How has Aegis West Seattle's energy performance changed over time?

BuildingCensus holds 7 Seattle disclosures for Aegis West Seattle, covering report years 2019–2025. Its ENERGY STAR score went from 57 in 2019 to 98 in 2025 (+41 points). Site EUI moved from 72.2 kBtu/ft² (2019) to 37.3 kBtu/ft² (2025), a 48% decrease. Reported emissions went from 139 tCO₂e to 15 tCO₂e over the same span (down 89%).

What does an ENERGY STAR score of 98 mean?

ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 98 means the building performs better than about 98% of its national peers. BuildingCensus bands the score into report-card grades; 98 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. In Seattle, 69% of scored buildings are at 75 or above.

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. Aegis West Seattle's 37.3 kBtu/ft² across 78,232 sq ft works out to about 2.9 billion Btu (855 MWh-equivalent) in 2025. Its source EUI of 104.4 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 738,943 kWh of electricity for the year.

Which law requires Aegis West Seattle to report its energy use?

Aegis West Seattle 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:50543:2025). 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.