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Fortitude Construction Group

Washington

ADU Builders, ADU Designers

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Website

https://fortitudeconstructiongroup.com/

Fortitude Construction Group is a Spokane-based design-build contractor serving homeowners throughout the greater Spokane region, including Airway Heights, Cheney, Liberty Lake, Spokane Valley, and nearby communities. As an experienced ADU builder and residential contractor, the company specializes in delivering thoughtfully designed accessory dwelling units, custom homes, and residential additions with a strong focus on craftsmanship and client collaboration.

Among their completed projects is a custom accessory dwelling unit in Airway Heights featuring a large, custom-designed kitchen and carefully finished interior spaces. Their work reflects a commitment to building practical, attractive living environments tailored to the needs of each homeowner.

Design-Build Approach

Fortitude Construction Group operates using a contractor-led design-build process that combines planning, design, and construction under one coordinated team. This approach helps streamline communication and keeps projects aligned from concept through completion.

Their design-build process is centered around:

Cost efficiency
Simplified communication
Better alignment between homeowner vision and final construction
Improved project coordination and scheduling

For homeowners planning a detached ADU, backyard cottage, granny flat, or home addition, this integrated process helps reduce delays and minimizes confusion between separate designers and contractors.

Residential Construction Services

In addition to accessory dwelling unit construction, Fortitude Construction Group provides a wide range of residential construction services, including:

Detached ADU construction
Custom home building
Home additions and expansions
Covered outdoor living spaces
Backyard cottages
In-law suites
Garage-related additions and remodeling
Ranch-style custom homes

Their portfolio includes projects such as fully covered exterior living spaces added to ranch-style homes in Cheney, as well as custom-built homes on Peone Prairie featuring open-concept layouts, custom kitchens, and covered patios.

Leadership and Construction Experience

Fortitude Construction Group is co-owned by Isaac Heyn and Justin Olney, both of whom bring extensive construction experience and leadership to the company.

Isaac Heyn

Isaac Heyn is a fifth-generation construction professional who began working in the industry at age 18 under the mentorship of his grandfather. After nearly a decade working with a respected Spokane-area general contractor, he launched Fortitude Construction Group with a focus on delivering high-quality construction projects and building long-term client relationships.

He is known for his hands-on problem-solving approach and commitment to ensuring projects reflect the homeowner’s vision accurately.

Justin Olney

Justin Olney brings more than 17 years of construction experience, including leadership roles with one of Spokane’s largest general contractors. Over the years, he supervised the construction of several prominent local projects and developed a reputation for strong project leadership and team building.

His philosophy centers on the belief that the process of achieving a result matters just as much as the finished outcome itself.

Dakota Heyn

Supporting the ownership team is Dakota Heyn, Office Administrator, who helps coordinate operations and client communication. Her administrative and customer service background contributes to a more organized and responsive client experience throughout each project.

Company Values

Fortitude Construction Group builds its work around three core principles:

People
Integrity
Impact

Their goal is not only to construct quality homes and accessory dwelling units, but also to create positive experiences for clients, employees, and the broader community.

ADU Construction in Spokane and Surrounding Areas

As a Spokane-area accessory dwelling unit builder, Fortitude Construction Group works with homeowners interested in creating:

Detached ADUs
Granny flats
Backyard cottages
In-law suites
Guest houses
Custom residential additions

Whether the project involves a standalone rental unit, a private family living space, or a custom backyard structure, their team manages the project from early planning through final construction.

Service Area

Airway Heights WA
Chattaroy WA
Cheney WA
Coeur d'Alene ID
Colbert WA
Deer Park WA
Hayden ID
Liberty Lake WA
Mead WA
Medical Lake WA
Nine Mile Falls WA
Otis Orchards WA
Post Falls ID
Spokane Valley WA
Veradale WA

8, North Post Street, Riverside, Spokane, Spokane County, Washington, 99201, United States

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