eco FLATS Image Oneeco FLATS Image Two

Project Name: EcoFlats HVAC

Location: 3951 N. Williams AVE., Portland, OR 97209

Architect: Works Partnership Architecture

General Contractor/ Developer/ Owner: Siteworks

Scope of Work:

  • Building/ Construction: N/A 
  • HVAC System: Hot Water Boiler

Developer/ Owner: 3935 N Williams, LLC


A building as progressive as the city it serves, EcoFlats is the first “Path to NetZero” project in Portland and was designed to achieve a NetZero energy standard. Located on N Williams Ave., EcoFlats’ site was consciously built on one of Portland’s most highly trafficked roads by urban cyclists and mass transit users. The residential portion of this building appeals to an urban demographic willing to take active participation in sustainable living.


  • Encompassed various renewable energy technologies; HVAC system focused entirely on efficiency.
  • Single boiler and hidden hydronic loop that stretches throughout three floors.
  • Integration with 30,000 square feet of solar, thermal, and photovoltaic collectors.
  • Portland’s most environmentally conscious building to-date.


  • Associated Builders and Contractors Excellence in Construction – Commercial Green Category

News/ Publications: