Rolling southern Piedmont farmland with vivid red clay exposed at a field edge, mixed oak, hickory and pine woodland and a small farm pond.
Iredell County 2018 NC Residential Code, statewide

Barndominium Builders in Iredell County, NC

Iredell County is where Charlotte's ring runs north up Interstate 77. The seat is Statesville, at the I-40 and I-77 crossing; Mooresville and Troutman sit on the southern end near Lake Norman, and the county reached an estimated 211,798 people in July 2025 — up 13.5 percent since 2020 on net migration of 24,488. It is still farm country underneath that: 894 farms working 119,481 acres, 32.5 percent of the county's land, with a median farm of 41 acres. Two things make this county different from the rest of the ring. First, its name is on a soil. The USDA's Iredell series — the one North Carolina soil that genuinely heaves, classed Vertic with very high shrink-swell and a perched water table one to two feet down from December through April — was established in the Statesville Area survey of Iredell County in 1901. It is not confined to this county and it is not what most of the county is made of, but the name came from here and the property is real. Second, the county has written down, in its own Land Development Code, the conditions under which it will hand land over to a town's extraterritorial jurisdiction — and the conditions under which it will not. That is the question a rural buyer near Statesville, Mooresville or Troutman actually needs answered before they buy.

Iredell County at a glance

County
Iredell County
City rules outside city limits
Iredell publishes its own ETJ-release rule: a town’s extraterritorial jurisdiction may only be extended into land inside that town’s Urban Service Area, and land outside a USA is not considered at all.
Population
211,798
ZIP codes
28115, 28117, 28166, 28625, 28677, 28660, 28634, 28689
Site visits
Same week for most of the county
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Building conditions in Iredell County

The building code does not change at a county line here. Under § 143-138(e) the North Carolina State Building Code applies throughout the state, and a city or county may adopt only a fire prevention code and floodplain regulations of its own — there is no general local amendment power, so there are no county amendments to look up. The edition in force is still the 2018 NC Residential Code, effective 1 January 2019; the 2024 edition has been delayed three times and carries no effective date at all. What genuinely differs is who issues the permit and inspects the work, what that office charges, how the parcel is zoned, what the local floodplain ordinance requires of the foundation — and two design numbers the code publishes county by county, the ultimate design wind speed and the seismic design category. The rest of Table R301.2 is set once for everyone: a flat 20 psf roof live load, a 12-inch frost line, Moderate weathering, and termite protection required everywhere in the state with no exemption. There is no ground snow load column in the residential code at all.

Build conditions for Iredell County , North Carolina : ultimate design wind speed 115 mph. BUILD CONDITIONS IREDELL COUNTY, NCIredell County2018 NC RESIDENTIAL CODEULTIMATE DESIGN WIND SPEED115 mphIredell County is not listed in Table R301.2(4) of the 2018 NC Residential Code, so it takes theunlisted default of 115 mph — the code floor, and the same figure as Mecklenburg, Catawba and…ZONING · R-A RESIDENTIAL AGRICULTURAL AND A-C…87,120 sq ft (2 acres) per dwelling…Table 2.3 sets the A-C Agricultural Conservation minimum at 87,120square feet per dwelling unit — exactly two acres — with 100 feet o…WHO ISSUES THE PERMITIredell County Department of Plannin…The Planning and Development department administers the LandDevelopment Code, holds the official zoning map, runs the Urban…
Build conditions for Iredell County, drawn from the sourced facts on this page. Every figure above is cited in the quick-facts panel below, with its source and vintage.
The county's name is on North Carolina's one genuinely expansive soil
The USDA's Official Series Description for the IREDELL series records SERIES ESTABLISHED: Statesville Area, Iredell County, North Carolina, 1901. Taxonomically it is a fine, mixed, active, thermic Oxyaquic Vertic Hapludalf — the word Vertic is the shrink-swell warning built into the name. Its argillic horizon from 7 to 27 inches carries very high shrink-swell with slickensides, clay content of 40 to 85 percent in the upper part, very slow permeability, and a perched water table 1.0 to 2.0 feet down from December through April. Two honest caveats: the type pedon is no longer here — it is in Chester County, South Carolina, on the US 72 bypass — and the series runs across the Piedmont of five southeastern states. Most of Iredell County is not this soil. But where it does turn up, it announces itself by colour: a dark grayish brown 2.5Y 4/2 surface over a brown 10YR 4/3 clay, against the red 10R 4/8 subsoil of the ordinary Piedmont Cecil, which is kaolinitic and does not heave.

USDA NRCS Official Series Description, IREDELL series, soilseries.sc.egov.usda.gov/OSD_Docs/I/IREDELL.html (read 2026-09-06; a bogus slug on that host returns a genuine 404)

Two acres, to the square foot, in the Agricultural Conservation district
Iredell created the A-C Agricultural Conservation district for large areas of rural farmland and very low density residential use, and Table 2.3 sets its minimum at 87,120 square feet per dwelling unit — exactly two acres — with 100 feet of lot width, 35-foot front and rear yards, 15-foot sides, a 25-foot corner yard and a 35-foot height cap that a tall shop bay can reach. The older R-A Residential Agricultural district, whose stated intent is to keep septic-dependent housing at a low enough density to stay healthy, sits at 20,000 square feet per dwelling under Table 2.5. Both are zoning floors, and both send a parcel inside a Water Supply Watershed to a separate and larger table.

Iredell County Land Development Code, Chapter 2 (Zoning Districts) §§ 2.4 and 2.5, Tables 2.3 and 2.5, iredellcountync.gov/DocumentCenter/View/421/Chapter-2-Zoning-Districts-PDF

The county wrote down when it will hand your land to a town
Section 4.3 of the Land Development Code governs municipal requests to extend extraterritorial jurisdiction into county land, and the first criterion is absolute: an area proposed for ETJ expansion must sit inside the Urban Service Area associated with that municipality, and areas outside a USA will not be considered. The USA boundaries were drawn with the City of Statesville and the Towns of Mooresville and Troutman in the 2030 Horizon Plan, and the code says plainly that they are not static. A town must also show water and sewer reaching the area within five years, demonstrate progress annexing and serving its existing ETJ, and let the Iredell-Statesville and Mooresville Graded School Systems comment. Under Section 4.3.2 an individual landowner may make the request themselves, with a posted public hearing and a decision at the Board's discretion.

Iredell County Land Development Code, Chapter 4 (Overlay Districts) § 4.3, iredellcountync.gov/DocumentCenter/View/423/Chapter-4-Overlay-Districts-PDF

The Municipal Growth Overlay is county-administered town rules
Where county land sits inside an Urban Service Area and municipal utilities are available or planned within two years, the Board of Commissioners can place a Municipal Growth Overlay on it. The overlay applies municipal-type development requirements that the county itself administers, so the parcel is still permitted by Iredell County while being built to a town's standards. Any land-use change inside an MGO triggers a written request for a statement of consistency from the municipality whose USA the land is in; the decision-making body is not bound by that statement, but if it decides against it, it has to explain why. Non-residential site plans go to the municipality for a 14-day review, and silence counts as support.

Iredell County Land Development Code, Chapter 4 § 4.4, iredellcountync.gov/DocumentCenter/View/423/Chapter-4-Overlay-Districts-PDF

The permit fee is a formula off a valuation table, not a rate on floor area
Iredell's building fee schedule, stamped Jan-26, states its own method: the latest ICC Building Valuation Data is adjusted by a regional modifier to give an average construction cost per square foot for the region, and the resulting Table A building value is multiplied by a permit fee multiplier of 0.0068 — $6.80 per $1,000 of table-derived value. The minimum on any category is $75. Because the ICC table figure and the regional modifier are not printed on the county's schedule, no dollar total can honestly be quoted, and the schedule is the place to ask. Three things a buyer will not expect are stated on it: a non-refundable $77.25 application fee is included in the charge for all permits rather than added to it, every permit carries a 3 percent technology and administrative fee, and starting work without a permit doubles the fees on a first violation and triples them on a second. Project review is separate at $0.06 per square foot. One permit covers each trade sub-permit and all inspections.

Iredell County Building Standards fee schedule (Jan-26), iredellcountync.gov/237/Fee-Schedule-PDF

Septic is priced by system type, and the lot has to be staked before they will look at it
Iredell County Environmental Health prices on-site wastewater by the system rather than by the step: a gravity system is $500.00 and a pump system $1,200.00 on the FY 2025-26 adopted schedule, with the Improvement Permit and the follow-on construction approval inside that one price. A $77.25 county zoning fee is charged alongside the application, and a new well permit is $550.00 — not the $495 figure that circulates in secondary sources. Water samples are billed separately. Before the application is accepted the county wants the property corners marked by a surveyor licensed in North Carolina, the property lines flagged every 25 feet and the proposed structure footprint staked, and the applicant pays for the backhoe that opens the soil pits. Note the wording: Iredell's own documents say Authorization to Construct, while the state rule at 15A NCAC 18E .0204 calls the same approval a Construction Authorization.

Iredell County Environmental Health Approved Fees 2025-2026, iredellcountync.gov/217/Environmental-Health-Fees-PDF, and Iredell County How to Apply for a Septic Improvement Permit, iredellcountync.gov/DocumentCenter/View/25686

Also worth knowing before you build in Iredell County

Red does not heave; dark grey-brown does
Cecil, the state soil and the red clay everyone pictures when they think of the Piedmont, is classed fine, kaolinitic, thermic Typic Kanhapludults with a Bt horizon of red 10R 4/8 and shrink-swell potential LOW. Kaolinite is a 1:1 clay and does not take water between its layers. The Iredell series, formed instead over diabase, diorite, gabbro and other rocks high in ferro-magnesian minerals, has a surface of dark grayish brown 2.5Y 4/2 over a brown 10YR 4/3 clay, and very high shrink-swell. So on a Piedmont lot the useful question is not whether the clay is sticky — it is what colour it is under the topsoil. A soil evaluation on the actual pad location by a licensed soil scientist is what settles it, and NRCS Web Soil Survey will show the mapped units for a parcel before an offer is made.

USDA NRCS Official Series Descriptions, CECIL and IREDELL, soilseries.sc.egov.usda.gov/OSD_Docs/C/CECIL.html and /I/IREDELL.html

The ring runs up the interstate, and the farms are still here
Iredell went from a 2020 census base of 186,686 to an estimated 211,798 in July 2025 — up 13.5 percent, with 24,488 people of net migration — and still holds 369 people per square mile across 574 square miles. The 2022 Census of Agriculture counts 894 farms working 119,481 acres, an average of 134 acres and a median of 41, on 32.5 percent of the county's land: twentieth in North Carolina for farmland acreage. The largest unincorporated place in the county, Lake Norman of Iredell, had 11,395 people at the 2020 census and no town government at all.

U.S. Census Bureau Vintage 2025 county population estimates and 2020 Census place counts; USDA NASS 2022 Census of Agriculture county profile, Iredell County, nass.usda.gov/Publications/AgCensus/2022/Online_Resources/County_Profiles/North_Carolina/

The town of Davidson is mostly not in Iredell, and Davidson County is not here at all
Davidson town had 16,662 people at the 2020 census, split 16,247 in Mecklenburg County and 415 in Iredell — so a small piece of the town is in this county while the overwhelming majority is not. Davidson County, meanwhile, is a different jurisdiction about sixty miles east in the Triad, on the other side of Rowan. A land listing that says "Davidson" is naming one of three places, and only one of them puts your permit application at 349 North Center Street in Statesville.

U.S. Census Bureau, 2020 Census place-by-county counts (ncgeo2020.pl, SUMLEV 155)

An excavator grading a compacted building pad on a cleared lot, with survey stakes, a drainage swale and a silt fence along the downhill edge.
Below the slab

The expensive surprises are in the ground, not the building

What moves a North Carolina budget is usually below grade, and the thing most often got wrong is which clay to worry about. Cecil — the red Piedmont clay everyone pictures, and the state soil — is kaolinitic and low shrink-swell; it does not heave. The soil that does is Iredell, formed over diabase and gabbro, which the USDA describes as vertic, very high shrink-swell, with a perched water table a foot or two down from December through April. The tell is colour: Cecil is red and Iredell is dark grey-brown, and they sit within a few miles of each other across the central Piedmont. West of that the question stops being clay and becomes slope, rock and colluvium; east of the fall line it becomes water, and in the Tidewater it becomes organic soil that subsides irreversibly once it is drained. Then the same ground decides the septic system, and North Carolina rewrote those rules recently enough that most of what is published about them is out of date. 15A NCAC 18E replaced the old subchapter on 1 January 2024 and was amended again on 1 June 2026: the site is classified on soil morphology — the word "percolation" does not appear anywhere in it — and there is no "provisionally suitable" any more, only suitable or unsuitable, on a single failed parameter. There is no statewide minimum lot size either; the area you need is derived from the soil result and then doubled, because a site that cannot fit both the initial field and its repair area is unsuitable. And the order matters more than people expect: the county health department's Improvement Permit and Construction Authorization come first, and the building permit is available on the strength of the Construction Authorization, not before it. One more thing that catches people: disturb more than an acre and you need an approved erosion and sedimentation control plan in hand before work starts, with penalties up to $5,000 a day, and a pad plus a drive plus a drainfield plus a laydown area crosses an acre faster than it sounds. So the site work, the foundation and the drainfield get resolved together rather than one at a time. We price the dirt before we price the building.

What we build in Iredell County

All nine services are available in Iredell County. What a build costs depends far more on the parcel than on square footage, so we price against your land rather than publishing a rate card.

Barndominium Kits

Engineered shell packages drawn to your own county's wind and seismic numbers under the 2018 NC Residential Code, with the exclusions written down.

Custom Plans

Barndominium floor plans drawn for your parcel, your county's design figures and the septic system your bedroom count will actually need.

Metal Homes

Metal building homes finished to live in — envelope, insulation, condensation control and interior finish specified to your NC county's climate zone.

See all nine services

What a build looks like

Three stages every Iredell County project passes through, from a raw parcel to a finished home. Site work first, because that is where the budget is decided.

Aerial view of an undeveloped rural lot with cleared grass, a mixed oak, hickory and pine treeline, exposed red clay in one corner and a pale gravel access track.
Stage one

The parcel

Zoning, setbacks, flood zone and utility access get checked before anything is drawn.

An excavator grading a compacted building pad on a cleared lot, with survey stakes, a drainage swale and a silt fence along the downhill edge.
Stage two

Pad and permit

Clearing, grading and a compacted pad, while the septic authorization and the building submittal work through whichever offices cover your parcel.

A finished barndominium at dusk with warm interior lighting glowing through its large windows.
Stage three

Frame to finish

Shell erected and dried in, then systems, insulation and interior finish through to CO.

Those are the rules where you are building in Iredell County. Tell us what you want to build and we will draw it to them.

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Where we build around Iredell County

Iredell County and the rural land around it. The buildable acreage for a project this size usually sits outside the town limits — which does not automatically put it under the county, because a town's zoning and building-code enforcement reach one to three miles past its limits into its extraterritorial jurisdiction. Inside the limits, in the ETJ, or in neither are three different answers to who issues your permit.

The Iredell County service area, including the rural acreage outside the built-up edge, which is where the parcels big enough for a build like this usually sit. The map marks the territory we build in. It is not a branch location, and there is no office at this pin.

Keep reading

The questions that usually come next once you know what Iredell County allows.

Barndominium Cost Guide

What the named, dated sources actually publish for North Carolina, with a calculator built on the same figures.

Read it

Is It Legal in North Carolina?

Why a "farm building" is defined as nonresidential, and the ten-acre right § 160D-903(b) gives you in exchange for building to the code.

Read it

How Long Does It Take?

Census build-duration data, and what actually sets the permit clock where you are building.

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Nearby areas we build in

Others we cover nearby. Every North Carolina municipality sits inside a county — there are no independent cities here — but that does not settle who regulates a given parcel. A town's zoning, subdivision rules and building-code enforcement extend one to three miles beyond its limits, by population, into what the statute calls its extraterritorial jurisdiction; town taxes and town elections do not follow. So the office that issues the permit, what it charges and how the land is zoned can all differ from one card to the next, and the mailing address will not tell you which case you are in.

Charlotte

Mecklenburg County
Catawba County

Catawba County
Rowan County

Rowan County
Lincoln County

Lincoln County

Building in Iredell County: common questions

9 questions we get asked most often about building in Iredell County. If yours is not on the list, ask it directly.

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Is the ground in Iredell County actually the expansive Iredell soil?
Sometimes, and the name is a genuine coincidence worth understanding rather than a description of the whole county. The USDA established the Iredell series in the Statesville Area survey of this county in 1901, but the series maps across the Piedmont of five southeastern states and its type pedon today is in Chester County, South Carolina. Where it does occur, it matters: it is classed Vertic with very high shrink-swell in the 7-to-27-inch argillic horizon, slickensides, very slow permeability and a perched water table one to two feet down from December through April. It forms over diabase, diorite and gabbro. The rest of the county is largely the ordinary Piedmont residuum, and the state soil Cecil that dominates that is kaolinitic with low shrink-swell — it does not heave. The tell is colour: Cecil's subsoil is red, Iredell's surface is dark grayish brown. Run NRCS Web Soil Survey on the parcel before you make an offer, and have a licensed soil scientist look at the pad location.
Why do the foundation problem and the septic problem turn out to be the same problem?
Because both are answered by the same soil profile, and on a Vertic soil both answers go the wrong way at once. Bearing and drainage: a clay with very high shrink-swell and a winter perched water table one to two feet down is poor support for a column footing, and very slow permeability defeats a simple surface-drainage plan around a slab. Septic: under 15A NCAC 18E the Piedmont site usually fails or gets throttled on soil morphology and clay group, which sets the long-term acceptance rate. A low rate means a long dispersal field, and .0508 requires room for both the initial field and a full repair area, so the drainfield acreage roughly doubles. That is why a lot that looks like an ordinary field can end up needing more land, an engineered system, and a foundation design that the ordinary prescriptive tables do not cover — all from one soil evaluation. It is also worth knowing that grading across a staked repair area for a shop pad can invalidate it.
Who permits my building — Iredell County, or Statesville, Mooresville or Troutman?
On unincorporated land it is Iredell County Building Standards at 349 North Center Street in Statesville. Inside a municipality's limits, or inside a municipality's extraterritorial jurisdiction under G.S. 160D-202, the town's zoning, subdivision rules and building-code enforcement apply instead — and the asymmetry surprises people, because ETJ land is not taxed by the city and its residents cannot vote in city elections. Iredell is unusual in publishing the rule for how that boundary moves: Section 4.3 of the Land Development Code will only consider an ETJ extension into land inside the Urban Service Area drawn with Statesville, Mooresville and Troutman. The town's official zoning map and the county register of deeds are where a specific parcel's status is recorded, and the Planning and Development department will answer it for an address.
How much land do I need for a barndominium here?
It depends which district the parcel sits in. The A-C Agricultural Conservation district asks 87,120 square feet per dwelling unit — exactly two acres. The R-A Residential Agricultural district asks 20,000 square feet per dwelling unit. Both carry 100 feet of lot width, 35-foot front and rear yards, 15-foot sides and a 35-foot height cap, and both send a parcel inside a Water Supply Watershed to a separate and larger set of densities in Section 4.5. Those are the zoning floors. The septic evaluation is frequently the binding number instead, because 15A NCAC 18E .0508 makes a site unsuitable if it cannot fit both the initial dispersal field and a repair area with all setbacks met — and on a slow Piedmont clay both of those are large.
What will the county permit cost?
Iredell does not publish a dollars-per-square-foot rate, so nobody can honestly quote you a total from the schedule alone. The county states the method instead: the latest ICC Building Valuation Data, adjusted by a regional modifier to an average construction cost per square foot for the region, gives a Table A building value, and the fee is that value multiplied by 0.0068 — $6.80 per $1,000. The minimum on any category is $75, project review is a separate $0.06 per square foot, a non-refundable $77.25 application fee is included in every permit rather than added to it, and every permit carries a 3 percent technology and administrative fee. Because the fee runs off table valuation rather than floor area, the heated-versus-under-roof question that decides the fee in several other North Carolina counties does not arise in the same form here. Septic and well are a separate department on a separate schedule — $500 gravity or $1,200 pump, plus $550 for a well — and a buyer reading only the building schedule will under-budget.
What are Iredell County's design numbers?
Iredell is not listed in Table R301.2(4) of the 2018 NC Residential Code, so it takes the unlisted default ultimate design wind speed of 115 mph — the code's floor. It is not among the thirteen counties Table R301.2(7) places in Seismic Design Category C, which puts it in A or B. Statewide values that apply here as everywhere: a flat 20 psf roof live load, a 12-inch frost line depth, Moderate weathering, and termite protection required in all of North Carolina at a Moderate-Heavy severity. There is no ground snow load column in the code at all — Section R301.2.3 is deleted — so any ground snow figure quoted for a build here came from somewhere other than the code. And Section R403.3, the frost-protected shallow foundation, is deleted in North Carolina: insulating instead of digging is not available.
Do I need an engineer for a metal or post-frame building in Iredell?
Usually yes, and North Carolina gives no residential exemption from it. Section R301.1.2 requires framing systems outside the code's prescriptive scope to demonstrate equivalent detailing. Section 83A-13(c)(1) exempts a family residence from the architect requirement, but § 89C-25 carries no equivalent residential carve-out for engineering — the subdivisions that would have provided one were repealed. So a post-frame or steel-framed barndominium here is normally an engineered building, sealed by a professional engineer licensed in North Carolina, and that engineering is a real line in the budget. It bites harder on this building type than on a conventional house, because a post-frame or steel frame concentrates load into a small number of column footings rather than spreading it along a continuous wall, and the code's presumptive bearing values are where that assumption gets tested.
Does building in steel let me skip termite treatment?
No, and this is a point where North Carolina departs from the model code. The IRC accepts cold-formed steel framing as one way of satisfying termite protection. North Carolina deleted that option from R318.1, and deleted physical barriers as well. A steel barndominium in Iredell still needs chemical termiticide treatment, a baiting system run under the rules of the NC Structural Pest Control Committee, pressure-preservative-treated wood or naturally durable wood. Termite protection is required in all of North Carolina. Steel does buy one thing: an entirely noncombustible structure escapes the R318.4 restriction on foam plastic below grade.
When does an erosion and sediment control plan kick in?
When the work will cumulatively disturb more than one acre on a tract. The plan has to be approved before land-disturbing activity begins, penalties run to $5,000 per day per violation, and approval may come from a delegated local programme rather than the state Land Quality Section — and a local programme is allowed to be stricter than the state minimum. The trap on a rural barndominium is that the acre counts the whole disturbance, not the building footprint: the pad, the long gravel drive, the septic area, utility trenching, laydown and stockpile. Measure the disturbed footprint before assuming it does not apply.

Building in Iredell County?

Start with the plan. Tell us what you want to build and we will draw it, then confirm which office issues the permit for your parcel, what it will let you put there, and what wind load it has to meet. That conversation costs nothing.

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