Harka Architecture HQ

A deep energy retrofit of Harka Architecture’s 600 sq. ft. Art Deco headquarters in Portland, Oregon, transforming a 1939 dentist’s office into a Net Zero Energy and Net Zero Carbon certified building. The project prioritized sustainability, non-toxic materials, resiliency, and design integrity while showcasing innovative materials and systems.

Building Type Office Location Portland, Oregon
Year Built 1939 Foundation Type Concrete (Crawl Space)
Structure Type Wood-Framed Total Floor Area 53.61m2
Climate Zone Marine Heating Degree Days 4500
Retrofit Status Complete Year Completed 2023
Retrofit Phasing No Geometry Changed Yes
Annual Energy Savings 123.6% Retrofit Type Envelope and Mechanical
Performance Level Net Zero

Project Team

Project Priorities

  • Reduce Energy Consumption
  • Reduce GHG Emissions
  • Use non-toxic materials

Project Goals

Harka Architecture’s retrofit of their Portland HQ exemplifies a holistic approach to sustainable design. The project combined architectural preservation with high-performance upgrades, including cellulose insulation, wood fiber boards, and a rooftop solar array that exceeded energy expectations. The building now operates on 100% site-generated energy and serves as a model for low-carbon, resilient architecture.

Upgrades

  • Advanced Air Sealing
  • Enhanced Insulation
  • Comprehensive interior and exterior retrofit
  • High-Performance Windows & Doors
  • High-Efficiency HVAC System
  • Heat Pump Water Heating
  • Solar PV System
  • Low-Carbon, Non-Toxic Materials
  • Drought-resistant Landscaping

Project Description

Planning the Retrofit

Unlike most projects, the Harka HQ retrofit was not bound by a strict timeline. The onset of COVID-19 removed external pressures, giving the team the rare opportunity to explore solutions at their own pace. This flexibility allowed for extensive research, experimentation with materials, and thoughtful decision-making. The project evolved from a simple remodel into a showcase of sustainable design, with a focus on embodied energy, operational efficiency, and low-toxicity materials.

Getting to Net Zero

Solar installation was completed in collaboration with Power Northwest, using 21 Jinko Solar panels and IQ7+ microinverters. Initially expected to offset 59% of energy use, the system surpassed expectations, producing 123.6% of annual energy needs. The building was certified Net Zero Energy and Net Zero Carbon by the Green Building Initiative. Battery storage was added in April 2025 to further reduce grid reliance and improve resiliency.

Lessons Learned

Hands-on involvement in construction revealed critical sequencing and coordination issues often overlooked in design. Air sealing challenges highlighted the limitations of relying solely on AeroBarrier systems. Material experimentation with magnesium oxide panels and milk paint provided insights into durability and compatibility. Resiliency messaging proved more effective than sustainability in client communications, shifting the narrative toward comfort, health, and energy security.

Before & After

General

Envelope

Mechanical & Electrical

Technical Documents

Videos

Go Zero! Tour 2023 – Harka Architecture HQ, Presented by Energy Trust of Oregon

Drawings or Details

Photos

Pre Retrofit

During Construction

Post Retrofit