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King County Parks Central Maintenance Facility
King County Parks Central Maintenance Facility
Renton, WA, United States
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Other Projects by McLennan Design | Bainbridge Island, WA, USA | Perkins&Will
King County Parks Central Maintenance Facility
Renton, WA, United States
STATUS
Built
YEAR
2023
SIZE
25,000 sqft - 100,000 sqft
BUDGET
$50M - 100M
King County Parks Central Maintenance Facility
Renton, WA | Civic, Industrial, Public Works
McLennan Design led the design of the King County Parks Central Maintenance Facility, creating a resilient, human-centered operations hub on a 5.7-acre site in Renton. The project replaces outdated infrastructure with five new buildings that expand offices, meeting spaces, and maintenance areas while improving circulation, safety, and staff well-being. Sustainability is central: the facility targets Net Zero Energy with 1,100 rooftop solar panels, air-to-water heat pumps, hydronic floor systems, mixed-mode ventilation, daylight harvesting, and a 50 kVA battery backup system. Stormwater is transformed into a native wetland park, supporting biodiversity and serving as an outdoor classroom. As King County’s first mass timber building pursuing the Living Building Challenge’s Energy, Beauty, and Health & Happiness Petals, the Renton Shop sets a new benchmark for equitable, durable, and regenerative municipal infrastructure.
McLennan Design partnered with HDR who was AOR.
Key Features:
50,250 sf public works and maintenance facility
Mass timber construction with regenerative systems
Net Zero Energy target, solar, battery backup, and EV readiness
Stormwater integrated as native wetland park and teaching tool
Human-centered design focused on staff well-being and operational efficiency
_________________________________________________
McLennan Design | Lead Architect & Sustainability
HRD | Architect of Record & Civil Engineering
Lund Opsahl | Structural Engineering
MEP | Rushing
Landscape Architect | Berger Partnership
Photo by Dan Schwalm © 2025 HDR
Renton, WA | Civic, Industrial, Public Works
McLennan Design led the design of the King County Parks Central Maintenance Facility, creating a resilient, human-centered operations hub on a 5.7-acre site in Renton. The project replaces outdated infrastructure with five new buildings that expand offices, meeting spaces, and maintenance areas while improving circulation, safety, and staff well-being. Sustainability is central: the facility targets Net Zero Energy with 1,100 rooftop solar panels, air-to-water heat pumps, hydronic floor systems, mixed-mode ventilation, daylight harvesting, and a 50 kVA battery backup system. Stormwater is transformed into a native wetland park, supporting biodiversity and serving as an outdoor classroom. As King County’s first mass timber building pursuing the Living Building Challenge’s Energy, Beauty, and Health & Happiness Petals, the Renton Shop sets a new benchmark for equitable, durable, and regenerative municipal infrastructure.
McLennan Design partnered with HDR who was AOR.
Key Features:
50,250 sf public works and maintenance facility
Mass timber construction with regenerative systems
Net Zero Energy target, solar, battery backup, and EV readiness
Stormwater integrated as native wetland park and teaching tool
Human-centered design focused on staff well-being and operational efficiency
_________________________________________________
McLennan Design | Lead Architect & Sustainability
HRD | Architect of Record & Civil Engineering
Lund Opsahl | Structural Engineering
MEP | Rushing
Landscape Architect | Berger Partnership
Photo by Dan Schwalm © 2025 HDR
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