Cost Breakdown: Building a Barndominium in 2025

One of the first questions we get from clients considering a barndominium is: “How much will it cost?” It’s a great question—and the answer depends on several factors like design, finishes, site prep, and utilities. But the good news is that barndominiums continue to be one of the most cost-effective ways to build a custom home in 2025.

At Stimson Contracting, we’ve built dozens of barndominiums across Spokane and the Inland Northwest, and we’ve developed a clear picture of what homeowners can expect when it comes to pricing. In this post, I’ll walk you through a detailed cost breakdown for building a barndominium in 2025, based on current materials, trends, and our real-world experience.

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Table of Contents

1. What Is a Barndominium?

2. Average Cost Per Square Foot in 2025

3. Site Prep and Foundation Costs

4. Exterior Shell and Structural Costs

5. Interior Finishes and Floor Plan Impact

6. Utilities and Systems (Plumbing, Electrical, HVAC)

7. Permit and Engineering Costs

8. Popular Add-Ons and Upgrades

9. Cost-Saving Tips Without Cutting Corners

10. Conclusion: Know Where Your Money Goes

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1. What Is a Barndominium?

A barndominium is a custom home built using post-frame construction—combining the exterior durability of a barn with the comfort, efficiency, and layout of a modern residence. These structures are fully livable, often with attached garages, shops, or storage areas built under the same roof.

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2. Average Cost Per Square Foot in 2025

In 2025, here in Spokane, most of the barndominiums we build fall in the range of:

• $120–$160 per square foot for fully finished living space

• $40–$70 per square foot for attached shop or garage space

This includes design, materials, labor, and finishes—but not land, site clearing, or extensive upgrades.

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3. Site Prep and Foundation Costs

Every build starts with the land. Site preparation typically includes:

• Clearing, grading, and leveling

• Excavation for utilities

• Concrete slab or pier foundation

Estimated site prep and foundation cost: $10,000–$25,000 depending on terrain and location.

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4. Exterior Shell and Structural Costs

This includes:

• Pressure-treated posts

• Engineered trusses and framing

• Metal roofing and siding

• Exterior doors and windows

Estimated shell cost: $30–$50 per square foot, depending on roof style, wall height, and custom features like porches or overhangs.

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5. Interior Finishes and Floor Plan Impact

The inside of a barndominium can be as simple or as luxurious as you want. Finishes typically include:

• Drywall or wood paneling

• Cabinets and countertops

• Flooring (LVP, carpet, tile)

• Trim, paint, and lighting

Estimated interior finish cost: $50–$90 per square foot depending on materials and complexity of the layout.

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6. Utilities and Systems (Plumbing, Electrical, HVAC)

Barndominiums are full-time homes, so expect to budget for:

• Electrical wiring and breaker panel

• Plumbing for kitchen, bath, laundry

• HVAC (mini-splits, radiant, or forced air)

• Septic, well, or public utility hookups

Estimated utility cost: $15,000–$35,000 depending on system type and rural vs. urban location.

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7. Permit and Engineering Costs

Spokane County requires:

• Engineered plans for snow/wind loads

• Energy code compliance

• Structural inspections

• Plumbing/electrical permits

Estimated permit and engineering cost: $4,000–$8,000 for most barndominium builds.

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8. Popular Add-Ons and Upgrades

Optional features that increase both functionality and cost include:

• Attached garages or shops

• Lofts or second stories

• Covered porches or patios

• Custom kitchens or spa bathrooms

• Solar power integration

• Smart home wiring

These can add anywhere from $5,000 to $50,000+ depending on scope and scale.

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9. Cost-Saving Tips Without Cutting Corners

Want to build smart without sacrificing quality? Here’s what we recommend:

• Stick to a simple footprint (rectangular/square)

• Choose durable but affordable finishes

• Install utilities now, finish interiors in phases

• Plan ahead for future expansions

• Work with an experienced, local builder to avoid rework or code issues

We help our clients make smart trade-offs that keep budgets on track.

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10. Conclusion: Know Where Your Money Goes

Building a barndominium in 2025 is one of the most efficient and rewarding ways to create a custom home in Spokane—but it pays to understand your costs. From shell to finish, utilities to permitting, knowing where your investment goes helps you stay on budget and avoid surprises.

At Stimson Contracting, we specialize in building custom barndominiums that balance cost, comfort, and value. Whether you’re just exploring or ready to build, we’re here to walk you through the process with clarity and confidence.