Fortitude Construction Group – Custom ADU Builder in the Spokane Area
Fortitude Construction Group is a Spokane-based design-build contractor serving the greater Spokane region, including Airway Heights, Cheney, and surrounding communities. Among their notable completed projects is a custom accessory dwelling unit in Airway Heights, featuring a large, beautifully designed custom kitchen. As an experienced ADU builder, Fortitude Construction Group brings the same level of craftsmanship and attention to detail to every accessory dwelling unit they construct.
In addition to their work as an accessory dwelling unit builder, the team at Fortitude Construction Group handles a range of residential construction projects. These include custom exterior additions, such as the fully covered outdoor spaces added to a rancher-style home in Cheney, as well as full custom home builds like their 2,200 sq ft rancher-style home on Peone Prairie, complete with three bedrooms, two bathrooms, a covered patio, and an open-concept custom kitchen.
A Design-Build Process Built Around the Client
Fortitude Construction Group operates as a contractor-led design-build firm, a process they believe yields superior outcomes across several key areas:
- Cost efficiency
- Streamlined communication
- Vision alignment between client and builder
This approach makes them a strong choice for homeowners seeking a detached ADU builder or granny flat builder who can manage the entire process from design through construction. By keeping design and construction under one roof, they minimize miscommunication and help clients stay on budget while achieving their vision.
Their mission is rooted in three core principles: People. Integrity. Impact. They aim to enhance the lives of everyone touched by their work — employees, clients, and end-users alike — while building enduring relationships and leaving a lasting, positive mark on the community.
An Experienced Team with Deep Roots in Construction
The company is co-owned by Isaac Heyn and Justin Olney, both of whom bring decades of hands-on construction experience to every project.
Isaac Heyn is a fifth-generation construction professional. He began working in the trade at age 18 under the guidance of his experienced grandfather, taking on significant commercial projects in the local area. After nearly a decade with a respected Spokane-based general contractor, he stepped away from a leadership role to launch Fortitude Construction Group. His focus is on serving the community with excellence and building lasting client relationships. He is known as an intense problem solver who ensures every project aligns precisely with the client's vision.
Justin Olney brings over 17 years of experience with one of the largest general contractors in Spokane, where he supervised the construction of several local landmarks. Justin is recognized for his ability to build strong teams and solve complex construction challenges. He believes that how you reach a goal matters just as much as the goal itself — a philosophy that shapes how Fortitude approaches every project, from a simple addition to a full custom ADU build.
Supporting the ownership team is Dakota Heyn, Office Administrator, who brings a strong background in administration and customer service to the Fortitude team. Her attention to detail and commitment to treating people right ensures that the client experience is smooth from first contact through project completion.
Fortitude Construction Group is based in Spokane, WA, and serves clients throughout the surrounding region. Whether the project involves a backyard cottage, a garage conversion, or a fully custom accessory dwelling unit, their team is equipped to deliver quality results with integrity.