Zero Energy Certified

KING STREET

VITAL STATS

Certification StatusZero Energy Certified
Date of CertificationSeptember 21, 2017
Version of LBC3.1
LocationSeattle, WA, USA
TypologyBuilding
Project Area3,680 SF
Start of OccupancyJune 2016
Owner OccupiedNo
Occupancy TypeOffice
Number of Occupants18

PROJECT TEAM

Owner1257 King, LLC
Project ManagerJulian Weber
General ContractorBelotti + McHugh Design and Construction Services
ArchitectJulian Weber Architects, LTD.
Lighting DesignJaidee Weber

PROJECT LEADERSHIP AND STORY OF PROJECT

JW Architects has been on a four-year journey to design, build and achieve Net Zero Energy in their new office building, located at 1257 South King Street in Seattle. Their office is the only second office building in Seattle to achieve certification. In 2014, JW Architects selected the site in the urban core of Seattle for its proximity to their homes, projects, and transit options. The project supports alternate transit with bike parking, showers and clothes storage.

“We worked as a team to create a building we could all stand behind,” said Julian Weber, Founding Principal. “Our vision included net-zero energy use, balanced daylighting and flexibility for future growth. Every employee at the firm had a role in the building, making it a uniquely collaborative process.”

The 2-story, 3,600 SF office building has blown-in insulation, LED lighting, a tight envelope, and windows placed for views but minimal heat loss or gain. The natural light that floods the building also allows the occupants to go through their workdays with minimal overhead light. The saw-tooth roofline and clerestory windows support energy efficiency goals and complement the industrial nature of the food manufacturing buildings in the neighborhood.

The architecture and landscape were inspired by Japanese minimalism. Simple lap siding covers the east and west facades, and traditional Japanese Shoji screens influenced the design of the north and south facades.

To make the journey come full circle, King Street was awarded an Honorable Mention at the 2017 AIA Seattle Honor Awards.

Photo courtesy of Lara Swimmer.

ENERGY PERFORMANCE

Actual energy use during performance period18,822 kWh
Actual energy produced during performance period28,187 kWh
Net Energy Use-9,365 kWh
EUI17.5 kBTU/sf/yr

BUILDING SYSTEMS INFORMATION

Roof R-Value75.9
Floor R-Value18.1
Wall R-Value40.3
Wall Section Description2×8 stud wall with blown-in fiberglass insulation and 2 inches of rigid insulation.
Window-Wall Ratio19.4%
Window U-Valve0.25
Window SHGC0.37
Window DescriptionAluminum Clad Wood – Double pane Advanced Low-E Insulating Glass with Argon
LightingLED Lights, Daylighting, Occupancy Sensors, Vacancy Sensors, Furniture-based Lighting Systems
HVAV System CharacteristicsPassive Cooling, Passive Thermal Mass
VentilationHeat Recovery Ventilation (HRV), Natural Ventilation
OccupancyOccupant Training, Occupant Engagement Strategies, Occupant Feedback from Monitoring System
Photo courtesy of King Street Project Team.

RENEWABLE PRODUCTION SYSTEMS INFORMATION

Solar Electric (PV). 24.26 kW DC/STC, 77 panels x LG Neon, 3 x String Inverters. Located on roof and owned by JW Architects.

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