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Granite Mountain Construction

Custom Garages, Additions & ADUs in Spokane, WA

Love your home but need more space? Granite Mountain Construction specializes in designing and building high-quality garages, home additions, and Accessory Dwelling Units (ADUs) that seamlessly integrate with your existing property. Whether you need a new workshop, an expanded family room, or a private guest suite, we add function, space, and lasting value to your Spokane-area home. Our goal is to make your new addition look and feel like it was always meant to be there..

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Our Pole Building Solutions

Agricultural Buildings

Durable barns for hay storage, livestock, and equipment. Designed for the demands of hardworking farms and ranches in the Inland Northwest.

Workshops & Garages

The perfect space for your hobbies, business, or vehicle collection. Fully customizable with options to meet all your needs.

RV & Boat Storage

Protect your toys from Spokane's four-season weather. We build secure, high-ceiling structures to accommodate even the largest recreational vehicles.

Commercial Structures

Cost-effective and versatile buildings for retail, warehouses, or light industrial use. A smart way for your business to expand quickly.

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Barndominium Shells

The perfect start for your dream "barndo." We build the weather-tight post-frame shell, and you finish the interior exactly the way you want it.

The Granite Mountain Advantage

Local Expertise

We don't just work here; we live here. We engineer our buildings to exceed local requirements that stand up to the environment.

Quality Materials

From commercial-grade steel siding to premium lumber, we use materials designed for longevity. We never cut corners.

Custom Design

Your building should fit your needs perfectly. We work with you to design a custom layout, not a one-size-fits-all kit.

Transparent Process

We believe in clear communication. Our process ensures you know what to expect from the first conversation to the final walkthrough.

Customize Your Building

  • Doors: Roll-up doors, man-doors, and custom garage doors.

  • Windows: Add natural light with a variety of window sizes and styles.

  • Siding & Roofing: Dozens of color options in durable metal panels.

  • Wainscoting: Add a classic, two-tone finish to your exterior.

  • Insulation Packages: Keep your space comfortable and energy-efficient year-round.

  • Lean-Tos & Overhangs: Add covered storage or a functional porch area.

Common Questions About Pole Buildings

How long does it take to build a pole building?

## How long does it take to build a pole building?

Typically, the on-site construction for a standard pole building takes between one to four weeks. However, the total project timeline depends on several key factors:

  • Size and Complexity: A simple two-car garage will be completed much faster than a large, multi-bay commercial workshop with interior walls and custom features.

  • Site Preparation: The timeline begins once the site is fully prepared. If your property requires extensive excavation, grading, or tree removal, this will add time before we can start building.

  • Customizations: Features like insulation packages, extensive electrical work, plumbing, and interior finishing will extend the construction phase.

  • Permitting & Design: The pre-construction phase, which includes design and securing permits from Spokane County, also contributes to the overall schedule. We help streamline this process, but it's an important factor to consider.

For every project, we provide a detailed and realistic timeline once we have finalized the design and scope of work.


Do I need a permit for my pole barn in Spokane County?

## Do I need a permit for my pole barn in Spokane County?

Yes, a building permit is required for virtually all new pole barns and pole buildings in Spokane County. If your building includes electricity or plumbing, separate electrical and plumbing permits will also be necessary.

The permitting process ensures that your new structure is safe, compliant with local zoning laws, and meets all building codes designed to handle challenges like our region's heavy snow loads.

Navigating the permitting process can seem daunting, but our team has extensive experience working with Spokane County and other local jurisdictions like Deer Park and Chattaroy. We can manage the entire application process on your behalf to ensure everything is submitted correctly for a smooth and timely approval.

Are pole buildings as durable as traditional structures?

## Are pole buildings as durable as traditional structures?

Absolutely. A modern, professionally engineered pole building is just as durable, and in some cases more resilient, than traditional structures. The term "pole barn" can sometimes bring to mind old, rustic buildings, but today's post-frame construction is a sophisticated and robust building method.

Here’s why they are so durable:

  • Solid Foundation: Large posts are set deep into the ground, creating an exceptionally strong foundation that effectively resists wind uplift and frost heave.

  • Superior Strength: The interlocking frame design efficiently transfers energy and loads—like heavy snow—directly to the ground, creating a stronger overall structure with less material.

  • Resilience: Post-frame buildings have a natural flexibility that can make them more resistant to seismic events and soil shifting compared to more rigid structures.

When built with high-quality materials by an experienced crew, your pole building is an investment that will last for decades.

Can you handle the site preparation and concrete?

## Can you handle the site preparation and concrete?

Yes, we are a full-service general contractor and can manage your entire project from the ground up. This includes all necessary site preparation and concrete work.

Our comprehensive services save you the stress and hassle of coordinating multiple different companies. We handle:

  • Site Preparation: Land clearing, excavation, and leveling the building pad.

  • Grading & Drainage: Ensuring the surrounding land is properly sloped to direct water away from your foundation.

  • Concrete: Pouring high-strength concrete slab floors, foundations, aprons, and walkways.

By managing these critical first steps, we guarantee a seamless workflow and a foundation that is perfectly prepared for the structure it will support.

Ready to Plan Your Pole Building?

Your project starts with a solid plan. Contact us today for a free, no-obligation consultation and estimate. Our team is ready to discuss your vision and provide a detailed quote based on your specific needs.

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