Barndominium floor plan and elevation drawings laid out on a drafting table with a scale rule.

Custom Plans in NC

A stock plan was drawn for someone else's lot under someone else's numbers. Drawing for the parcel is not a luxury purchase in North Carolina — Section R301.1.2 of the NC Residential Code requires other framing systems to demonstrate equivalent detailing for force transfer, continuity and compatible deformations, and there is no residential exemption from the engineering statute for a designer to fall back on. Two decisions belong at the start rather than the middle: how many bedrooms, because that sizes the septic system and the septic system gates the building permit, and whether the drawings will be sealed, because a sealed set changes what an owner-builder has to do for the next eight months.

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How a custom plans project runs

Four stages, in this order. The sequence matters more than it looks: getting engineering and permitting settled before anything is fabricated is what keeps a build from stalling.

1

Start with the parcel, not the plan

Slope, soil depth, where the drainfield and its repair area can physically go, where a well can sit relative to both, and which design figures your county publishes. Table IX of 15A NCAC 18E .0601 sets the setbacks the layout has to respect: 100 feet from a shared or community well, 50 feet from your own private well, 10 feet from any property line, and 5 feet from the building foundation and from anything else bearing on a footing. That last one catches detached shops, lean-tos and covered RV bays, which is why the septic layout and the site plan get drawn together rather than in sequence.

2

Decide the bedroom count early

The Improvement Permit issued by the county health department fixes the design daily flow, the bedroom count, the effluent standard, all setbacks and the staked location of both the initial dispersal field and the repair area. Adding a bedroom later is not a drawing change, it is a new septic determination. And since 1 January 2024 the classification under 15A NCAC 18E is binary — .0509(a) makes a site suitable only if every parameter is suitable, and one unsuitable parameter makes the whole site unsuitable. 'Provisionally suitable' is gone from the rules, though it still appears on older permits and county records.

3

Draw the building, then the structure

Shop-to-living ratio, clear span, ceiling heights, where the mezzanine lands, how the two halves are separated thermally and acoustically, and how the openings fall in the walls that are doing the bracing. The roof structure follows the code's own statewide numbers rather than a regional guess: North Carolina's table gives a flat 20 psf roof load everywhere and has no ground snow load column at all — Section R301.2.3 is deleted — so the roof is a live-load and wind problem here, not a snow problem.

4

Take the set to permit-ready

Foundation and anchorage details, wall sections, the structural package, and the engineering where the prescriptive code does not reach under Section R301.1.3. Foundations are drawn against a 12-inch frost line depth with the note that North Carolina deleted Section R403.3 — frost-protected shallow foundations, the insulate-instead-of-dig route, is not available here. What arrives at the counter is a set the reviewer can follow rather than a set they have to interpret.

Overhead view of architectural floor plan and structural elevation drawings spread on a workbench with a scale ruler and pencil.
The clause that pays for the drawings

Sealed architect drawings buy an NC owner-builder out of attending every single inspection

If you build your own house in North Carolina, G.S. 87-1(b)(2) exempts you from the general contractor licence — and G.S. 87-14(a)(1) then makes you swear to three things on a verified affidavit at the permit counter. That you own the property. That you will personally superintend and manage all aspects of the construction, and will not delegate that duty to any person not licensed under the Article. And that you will be personally present for all inspections required by the North Carolina State Building Code — 'unless the plans for the building were drawn and sealed by an architect licensed pursuant to Chapter 83A of the General Statutes.' Read the second clause carefully, because it ends the common arrangement where the owner pulls the permit and an unlicensed builder runs the job; the affidavit exists to catch exactly that, it goes to the Licensing Board, and the Board verifies it, with the permit revocable under G.S. 160D-1115. Read the third clause carefully for the opposite reason: it is the one place in North Carolina law where paying for drawings measurably reduces what you personally have to do. Note the wording though — the statute says architect under Chapter 83A. It does not say engineer, and a P.E. seal under Chapter 89C is not named in that clause.

Where we deliver custom plans

In North Carolina the city limit is a real boundary, but not the one most people expect. There are no independent cities here — every municipality sits inside one of the 100 counties — and under § 160D-202 a city runs zoning, subdivision and the building code one to three miles beyond its own limits, on a scale set by population, while city taxes and city elections stop at the corporate line. Land that looks entirely rural can be inside that extraterritorial jurisdiction, and the mailing address will not tell you. The code itself is not what changes when you cross the line: the State Building Code applies on both sides and enforcement is mandatory everywhere. What changes is who reviews the drawings, what they charge, how the land is zoned, and the ultimate design wind speed the code publishes for your county. Two parcels twenty miles apart can carry completely different engineering.

Serving clients across the entire region.

Every jurisdiction we build in has its own reviewer and its own fee schedule, and the code sets a different design wind speed county by county. The service area pages set out what applies where.

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Before you commit

What actually decides the price

Square footage is the number everyone leads with, and it is rarely the one that moves a barndominium budget. These four do.

  • Bedroom count

    Bedrooms are a wastewater decision before they are a floor-plan decision. The count is written onto the Improvement Permit along with the design daily flow, and the drainfield it buys is sized from the soil group's long-term acceptance rate — then effectively doubled, because 15A NCAC 18E .0508(b) makes a site unsuitable if it cannot fit both the initial system and a repair area. There is no statewide minimum lot size in the rule; the area you need is derived from your own soil.

  • Shop-to-living ratio and span

    Where the dividing wall falls decides the structure, the envelope and the mechanical layout at once. A 40-foot clear span over the shop and a conventionally framed living wing are two different structural systems sharing one roof plane, and the transition between them is a detailing problem the drawings have to solve rather than leave to the field. Eave height, mezzanines and overhead door openings all land here too.

  • Whether the set is sealed, and by whom

    G.S. 83A-13(c)(1) exempts a family residence from needing an architect, but G.S. 89C-25 has no residential exemption for engineering at all — the subdivisions that would have provided one were repealed in 2011 and 2014. Since Section R301.1.2 pushes a barndominium's frame outside the prescriptive tables, engineering is normally required and there is no exemption covering it. An architect's seal is separately worth pricing if you are building as an owner-builder, for the reason above.

  • What the parcel makes the plan do

    Slope drives required soil depth under 15A NCAC 18E .0502(d), which adds trench width times percent slope to the 18-inch minimum, so a sloping Piedmont lot needs more soil than a flat one. A riparian buffer, a Special Flood Hazard Area, a water supply watershed classification or a city's extraterritorial jurisdiction can each move the building before the first line is drawn. Finding those at the drawing stage costs a revision; finding them later costs a redesign.

Barndominium floor plan and elevation drawings laid out on a drafting table with a scale rule.

Custom Plans in NC: common questions

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

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Why not just buy a stock plan online for a few hundred dollars?
You can, and plenty of people do — but understand what you have bought. A stock plan is a layout, drawn for a different lot, a different climate and usually a different code. It is not a permit set, it does not carry a seal, and its structural package was not engineered against the wind figure your county publishes in Table R301.2(4) or against the soil under your particular slab. In North Carolina there is a second problem specific to this building type: Section R301.1.2 of the Residential Code states that the code's requirements are based on platform and balloon framing and that other framing systems must have equivalent detailing to ensure force transfer, continuity and compatible deformations. A post-frame or steel-frame barndominium is an other framing system. A stock plan cannot demonstrate that detailing for a frame it never specified. The honest use for a stock plan is as a conversation starter about layout — bring it, we will tell you what survives contact with your parcel.
Do my plans need an engineer's stamp in North Carolina?
Usually yes, and the reason is a confirmed absence rather than a requirement. G.S. 83A-13(c)(1) exempts a family residence from the architect requirement outright. G.S. 89C-25, the equivalent limitation on the engineering chapter, lists eleven activities the chapter does not prevent and none of them is a residential, square-footage or dollar-value exemption — the two subdivisions most likely to have contained one were repealed in 2011 and another in 2014. Put that beside Sections R301.1.2 and R301.1.3, which push a barndominium's frame into engineered design, and the result is that a North Carolina barndominium is normally an engineered building with no residential exemption covering the engineering. You can design a house here without an architect. You cannot have an unlicensed person do the structural engineering, and the architect exemption does not substitute for the engineer.
How many bedrooms should I draw?
Decide it before anything else, because in North Carolina the bedroom count sizes the septic system and the septic system gates the building permit. 15A NCAC 18E .0201(c) states that upon issuance of the Construction Authorization the applicant may obtain a building permit — the county health department's authorisation comes first, always. The Improvement Permit that precedes it fixes the design daily flow and the bedroom count on the face of the permit, along with the staked positions of the initial drainfield and its repair area. Two consequences follow. First, adding a bedroom after the Improvement Permit issues reopens the septic determination, not just the drawing. Second, the count you choose has to survive the soil: the drainfield length comes from the soil group's long-term acceptance rate, and .0508(b) then requires room for a repair area as well, or the site is unsuitable. A four-bedroom plan on thin soil is a smaller house on that parcel than the same plan on deep sandy soil.
Should I have plans drawn before or after I buy the land?
Have the land evaluated before you buy it, and drawn afterwards. The parcel decides more of the plan than the plan decides of the parcel. Under 15A NCAC 18E a site is suitable only if every parameter is suitable — slope not over 65 percent, not a depression or jurisdictional wetland, soil wetness condition at least 12 inches down or 18 in sandy soils, at least 18 inches of soil above rock or saprolite, no restrictive horizon shallower than 18 inches, and room for both an initial system and a repair area. One failure makes the whole site unsuitable, and the county has to give you a signed written report saying which rule you failed and whether a fix exists. Beyond septic, check for a riparian buffer on any blue line crossing the tract, whether the parcel sits in a water supply watershed, whether it is inside a municipality's extraterritorial jurisdiction, and whether pad, driveway and septic together will disturb more than an acre and trigger an erosion and sediment control plan.
I plan to build it myself. Is having plans drawn still worth it?
It is arguably worth more to you than to anyone else, and the reason is statutory. An owner-builder claiming the G.S. 87-1(b)(2) exemption executes a verified affidavit under G.S. 87-14(a)(1) attesting that they own the property, that they will personally superintend and manage all aspects of construction and will not delegate that duty to any person not licensed under the Article, and that they will be personally present for all inspections required by the State Building Code — unless the plans for the building were drawn and sealed by an architect licensed under Chapter 83A. That last clause is a genuine, cited escape hatch from a long series of weekday mornings on site. Two cautions. The statute names an architect, not an engineer, so a P.E. seal does not relieve that clause. And the affidavit is audited: the inspector transmits it to the Licensing Board, which verifies the exemption was validly claimed, and a permit issued on a bad claim is revocable under G.S. 160D-1115.
Does my county have its own code amendments the plans have to meet?
No — and this is the single most common wrong assumption in North Carolina, including among people who build here. G.S. 143-138(e) provides that the Code shall apply throughout the State, and there is no general local building-code amendment power. The only things a local government adopts are a fire prevention code, subject to approval and limited as to one- and two-family dwellings, and floodplain regulations. So the code your plans are drawn to is the same in Murphy as in Manteo. What is not the same is the numbers inside it — wind speed and seismic design category are set county by county in Tables R301.2(4) and R301.2(7), and five rows of the criteria table say 'Local' and have to come from the individual jurisdiction. Zoning is a separate instrument entirely and genuinely is local: on the UNC School of Government's 2019 count, 19 of North Carolina's 100 counties had no county zoning program at all and another 12 zoned only part of their territory, so 'is my land zoned?' is a real question here rather than a formality. And a city's extraterritorial jurisdiction under G.S. 160D-202 carries zoning, subdivision rules and the building code one to three miles past the city limits, on land that looks and feels rural.
What is actually in a permit-ready barndominium plan set?
A site plan showing the building, the driveway, the well and the septic system with its repair area, all located to the setbacks in Table IX. Floor plans and elevations. Wall sections and a foundation plan drawn against a 12-inch frost line depth, noting that North Carolina deleted Section R403.3 so the frost-protected shallow foundation route is not available. A structural package for the frame with the connection path drawn from roof plane to anchor bolt, since Section R301.2.1 requires a continuous load path to transmit uplift from the roof assembly to the foundation. Energy compliance for the county's climate zone, which is not intuitive — Mecklenburg County is zone 3A while Wake County is 4A, so two identical houses 140 miles apart on the same interstate answer different envelope requirements. And the engineering where the prescriptive code does not reach. What you are buying is a set the plan reviewer can follow without phoning you.
How much roof load do the plans have to carry — do I need to worry about snow?
Less than you would expect, and this is one of the few genuinely statewide numbers North Carolina publishes. The NC Residential Code's criteria table gives a flat 20 psf roof load, everywhere, in both the 2018 edition in force and the 2024 edition awaiting an effective date. There is no ground snow load column in the North Carolina table at all, and Section R301.2.3, the model provision that routes heavy ground snow to engineered design, is marked deleted. So no North Carolina county has a published ground snow load to design to, and any plan set carrying one has imported it from somewhere else. A caution for anyone checking this themselves: footing-width, rafter-span and header-span tables inside the NC code still print '25 psf ground snow load' and similar figures in their headings. Those are span-table inputs carried over from the model code, not North Carolina design criteria. Wind, not snow, is what sizes a big roof plane here.

Keep reading

The pages that answer the next question this one raises.

Do You Need Engineered Plans?

Whether the county or a city reaching miles past its own limits issues your permit, and what each one decides.

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Floor Plans

Starting points by footprint and by feature, before anything is drawn from scratch.

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Permitting

What the finished set has to contain for a complete submittal.

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Tell us about the land

Send the parcel ID or an address and we will come back with what can be built on it, the wind load it has to meet, and a realistic budget range. That conversation costs nothing.

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