Permitting a barndominium in Northwest Arkansas depends heavily on which county your property sits in, and Benton County and Washington County handle the process differently enough that assuming one county’s rules apply to the other is a common, costly mistake. Both counties will require a residential building permit for a barndominium since it’s a livable structure, but the path to get there looks different in each.
We field this question constantly from clients who’ve done some research online and gotten confused, usually because most of what’s written about barndominium permitting online is generic, written for no particular state or county at all. Here’s what actually applies if you’re building in Benton or Washington County.
Why a Barndominium Doesn’t Get Treated Like a Pole Barn
Here’s the thing homeowners sometimes assume, and it trips people up more than anything else in the permitting process. The metal exterior doesn’t exempt a barndominium from residential code review. It has plumbing, electrical systems, and living space, which means both counties treat it as a residence, not an agricultural or accessory structure, regardless of how it looks from the road.
This matters because a lot of the permit exemptions you’ll find online for pole barns, shops, or storage buildings simply don’t apply once that structure includes a kitchen, bathroom, or bedroom. Knowing this upfront saves a lot of wasted research time chasing exemptions that were never going to apply anyway.
Washington County: What to Expect
Washington County’s permitting path depends on where your property falls relative to city planning boundaries, since the county has established different zoning classifications for rural unincorporated land versus land closer to incorporated cities and towns. Rather than guessing which category your lot falls under, the most reliable first step is contacting the Washington County Planning Office directly to confirm your parcel’s classification, since that determines how your permit review will proceed.
If your lot needs a septic system, which most rural NWA barndominium sites do, the Washington County Health Department requires an approved soil analysis, often called a perc test, before the county will move a permit forward. That test alone can take one to three weeks depending on scheduling, so requesting it early in the process rather than waiting matters more than most homeowners expect.
Larger properties can trigger additional review too. Washington County requires Planning Board approval for developments on a lot larger than one acre, though agricultural and most single-family residential projects are excluded from that requirement.
Benton County: What to Expect
Benton County’s process centers around its Building Safety Department, which issues residential permits for new construction, additions, and remodels. As of November 2023, Benton County no longer requires permits for detached, unlivable structures like shops or storage buildings in unincorporated areas. A barndominium doesn’t qualify for that exemption, since it’s a residence rather than a detached, unlivable structure, so it goes through the standard residential permitting process.
That process asks for a fairly detailed submission. Benton County wants a floor plan showing dimensions, room labels, window and door locations, and plumbing fixture locations, along with exterior elevations for every side of the structure. From there, inspections follow a set sequence, generally footing, under-slab plumbing, framing, and rough-in electrical, plumbing, and mechanical work, before a final inspection clears the home for occupancy.
One detail worth knowing ahead of time. All property in unincorporated Benton County can be used for single-family residential or agricultural purposes without needing rezoning, which simplifies the zoning side of things for most rural barndominium sites, even though the building permit itself still goes through full residential review.
Washington County vs. Benton County: Quick Comparison
| Washington County | Benton County | |
|---|---|---|
| Permit issued by | Zoning compliance review (varies by land classification) | Building Safety Department |
| Septic requirement | Approved perc test from the Health Department before permit moves forward | Handled separately through the Arkansas Department of Health |
| By-right residential use | Confirm with Planning Office based on property’s zoning classification | Allowed by right on unincorporated property |
| Large lot review threshold | Planning Board review over 1 acre (with exclusions) | Site plan or subdivision review for non-residential uses |
| Inspection sequence | Set by Building Safety at permit issuance | Footing, under-slab, framing, rough-ins, final |
Treat this as a general orientation rather than a substitute for confirming your specific lot’s requirements with the county directly, since zoning classification and lot history can shift what applies to your particular property.
Common Delays and How to Avoid Them
More often than not, permitting delays trace back to timing rather than actual problems with the application. The perc test is the most common bottleneck in Washington County specifically, and requesting it the same week you finalize a site plan, rather than waiting until the permit application is otherwise ready, keeps that step from stalling the rest of the schedule. We break down how this fits into the bigger picture in our barndominium building timeline, which walks through the full process from signed contract to certificate of occupancy.
Floodplain status is also worth checking early. Washington County requires a separate floodplain development permit before construction begins on any property within a mapped floodplain area, and it’s a good habit to confirm floodplain status with your county’s planning office regardless of which county you’re building in, since flood insurance rate maps get updated periodically and a property’s status can change.
Working With a Builder Who Knows the Local Process
This is genuinely one of the areas where experience with a specific county saves real time. A builder who’s been through Benton County’s floor plan and elevation checklist a dozen times, or who knows exactly when to request a Washington County perc test relative to the rest of the site plan, catches the small timing issues before they become week-long delays.
If you’re planning a barndominium construction project in either county, Torres Construction Group has navigated both permitting processes directly and can walk you through what your specific property will need before you’re deep into paperwork.
Frequently Asked Questions
Do I need a building permit for a barndominium in Washington County?
Yes. Since a barndominium includes living space, it goes through residential zoning compliance review rather than the exemptions available for detached agricultural or storage structures.
Do I need a building permit for a barndominium in Benton County?
Yes. Benton County’s 2023 exemption for detached, unlivable structures doesn’t apply to a barndominium, since it’s a residence with plumbing and living space.
How long does the permitting process take in Washington County?
It varies, but the perc test alone can take one to three weeks, and that’s before the rest of the building permit review begins, so it’s worth starting that step early.
What does Benton County require in a permit submission?
A detailed floor plan with dimensions and fixture locations, along with exterior elevations for all sides of the structure. Computer-generated plans are preferred, though legible hand-drawn plans to scale are accepted.
Can I build a barndominium on agricultural land in either county?
In most unincorporated areas of both counties, single-family residential use is allowed on agricultural land, though it’s worth confirming your specific parcel’s zoning classification before finalizing plans.
Do I need a septic permit separately from my building permit?
Yes, in both counties. Septic systems are regulated through the Arkansas Department of Health and the county health department, separate from the building permit process itself.
What if my property is in a floodplain?
Washington County requires a floodplain development permit before construction begins if the property falls within a mapped floodplain area. It’s worth confirming floodplain status with your county’s planning office regardless of location, since maps are updated periodically.
Does the metal exterior of a barndominium exempt it from residential code?
No. Both counties evaluate a barndominium based on its use as a residence, not its exterior material, so it goes through the same code review as a stick-built home.
Can I start construction while my permit application is still pending?
No. Construction generally can’t begin until the permit is issued, since starting early risks having to redo work that doesn’t match what’s eventually approved.
Who do I contact with permitting questions in each county?
Washington County’s Planning Office handles zoning questions, while Benton County’s Building Safety Department handles permit applications and inspections. Both offer direct phone and online contact options for property-specific questions.
Navigating Barndominium Permits and Zoning Before You Break Ground
Permitting a barndominium in Northwest Arkansas isn’t complicated once you know which county’s rules apply and what documentation each one expects. Washington County’s process runs through zoning compliance and a septic perc test timeline, while Benton County’s runs through a detailed residential submission and inspection sequence, and knowing that difference upfront keeps a build on schedule.
If you’re planning a barndominium build in Benton or Washington County, contact us and Torres Construction Group can walk you through exactly what your property will need before you start the permitting process.