Frequently Asked Questions

It depends on the size, the finish grade and the site. Published cost guides give typical per-square-foot ranges, which are listed on the Custom Barndominium Homes page, but they leave out land and site work. Hillside lots, long driveways, rock, septic systems and basements add to the total, which is why the written estimate comes after a site visit.

Generally yes, as long as the home meets the residential building code and the zoning, setback and subdivision rules for the parcel. Knox County Codes Enforcement adopted the 2018 International Residential Code, and the City of Knoxville uses the 2024 edition. Subdivision covenants or HOA rules can restrict metal siding, so we check the deed restrictions too.

In Knox County, yes, if the lot is not on public sewer. The Knox County Health Department says a septic permit is required before Codes Enforcement will issue a building permit for a residence, and the permit application needs a soil map from a private soil consultant and a site plan. Surrounding counties go through TDEC, which can take up to 45 days after a complete application.

They can be. Much of the valley sits on limestone, and USDA soil descriptions for common local soils note sinks and depressions. We look for surface signs during the site visit and recommend soil borings or a geotechnical review when a lot shows them, before the slab is designed.

It can take more legwork than a standard house. Many lenders do not offer construction loans for barndominiums, and the appraisal is often the biggest hurdle because the appraiser needs comparable sales nearby. Talk to a lender early; we provide the plans, specs and line-item estimate a lender will ask for.

Both are built here. Red-iron steel frames span wide open rooms and large shop bays without interior posts; wood post-frame buildings cost less to frame and are easy to finish with ordinary interior materials. The choice usually comes down to span, the shop you want and budget.

With a continuous air and vapor barrier against the steel, usually closed-cell spray foam, plus proper ventilation and HVAC sizing. Hansen Pole Buildings reports a dripping barndominium ceiling where only half an inch to an inch of foam was used and recommends at least two inches.

It depends on permits, septic approval, the building package delivery and the finish level. Site prep and permits often take longer than raising the shell. We give you a written schedule broken into site work, foundation, shell, dry-in and finish-out once the plan and site are set.

No. Kits are the building package. HomeBlue's Knoxville kit range of $20 to $35 per square foot is shell material only and excludes interior finishes, labor and land. The foundation, site work and utilities are priced separately.

HomeGuide lists a 40x60 kit (2,400 square feet) at about $72,000 to $120,000 including assembly. A finished home of that size costs far more once foundation, utilities and finish-out are added.

Some owners do part of the work. Steel frames are heavy and need lifting equipment, and every phase still goes through the permit and inspection process for the county or city you build in. We can quote erection only or the full build.

Reputable kits come with engineered drawings for the design loads where they will be built. We confirm the kit's snow, wind and seismic loads match what the permit office requires for your site before it is ordered.

Delivery depends on the manufacturer's schedule. Erection of the shell is usually the fast part; septic approval, the permit and the foundation often take longer. We build the schedule around those dates.

Common footprints include 30x40, 40x60 and 50x80. HomeGuide prices kits in those sizes, from 1,200 to 4,000 square feet. The right size depends on bedrooms, whether a shop shares the roof, and the lot.

Yes, as a starting point. Most plans need changes for the lot, the septic layout, the building package and the local code, and they still need a site plan and the building maker's engineering for the permit.

HomeGuide lists stock barndominium plans at about $1,300 to $2,000 and custom plans at about $4,500 to $6,000 or more. Fixr puts drafting at $0.35 to $10 per square foot depending on how custom the plan is.

Per square foot of floor area, often yes, because the roof and foundation cover more living space. Long open spans for the upper floor can erase the savings, so we compare both before you commit.

Yes. In Knox County the septic permit application asks for the number of bedrooms and whether a basement has plumbing, and the system is sized from that. Settle the bedroom count before the soil work.

HomeBlue estimates about $67 to $111 per square foot in Knoxville depending on grade, excluding land and site work. HomeAdvisor's national figure for a barndominium built with a general contractor is about $150 to $190 per square foot. Finish level and the site make the difference.

Often, but not always. HomeGuide compares barndominiums at $65 to $160 per square foot with a traditional house at $180 to $280. High-end finishes, basements and difficult sites narrow the gap.

Yes, but plan ahead. Many lenders do not offer construction loans for barndominiums, and appraisers need comparable sales. Lenders familiar with rural property, and USDA programs for eligible rural buyers, are worth asking about early.

Anything a conventional house has. The outside can be metal panels or other siding with porches and wainscot; inside, drywall, wood, tile, custom cabinets and stone are all common.

They need a plan for the steel. Closed-cell spray foam against metal roofs and walls is common because it acts as an air and vapor barrier, which stops warm, humid air from condensing on cold metal.

Yes. Common approaches are a walk-out lower level, stepped footings, or piers to rock. The steeper the grade, the more the foundation, retaining walls and driveway add to the cost.

There is no single cutoff for every parcel, but the county's Hillside and Ridgetop Protection Plan notes that ridges over 25 percent are hard to engineer for roads and foundations and that development has mostly stayed below 25 percent. Rezoning on slopes of 25 percent and up is limited to about one home per two acres.

HomeAdvisor puts walkout basements at about $25 to $55 per square foot, or roughly $37,000 to $101,000 total. Waterproofing, drainage and finishing the space add to that.

HomeGuide notes that walls 4 feet or taller usually require a structural engineer's design, at about $500 to $2,000 or more. Walls holding up a driveway or a house always deserve one.

On many ridge lots, yes. Limestone and chert are common in the soils here. We look for outcrops during the site visit and include rock removal or design changes in the estimate.

A barndominium is mainly a home in a barn-style building. A shop house combines a working shop and a home, usually with a taller shop section and a shorter living section. Many projects are a mix of both.

Extra Space puts the average shop house at about $50 to $120 per square foot. Costs rise with finished living space, big doors, heavy slabs and shop heating and cooling.

Often, yes, as long as zoning allows the use and the building meets the residential code for the living area. We check the zoning and any deed restrictions for your parcel.

That depends on how you use it. With humid summers and winter lows, many owners insulate the shop fully and add a mini-split or heater. Insulating the steel also prevents condensation dripping on tools and vehicles.

Sometimes. Where the drain goes depends on whether you are on sewer or septic and what the local office allows, since oil and chemicals cannot go into a septic system. We sort that out before the slab is poured.

A properly engineered steel building handles the region's wind and snow loads, and metal roofs shed heavy rain well. The main local issue is humidity: without a vapor control plan, condensation can form on the steel.

HomeGuide lists custom installed metal buildings at about $50 to $200 per square foot and a 40x60 turnkey metal building home at about $120,000 to $350,000. Knoxville barndominium estimates from HomeBlue run $67 to $111 per square foot before land and site work.

An uninsulated metal roof is noisy. Spray foam or other insulation under the roof deck, plus a finished ceiling, quiets it to the level of an ordinary house.

Coated steel panels and frames resist rust, but trapped moisture is the risk. Condensation running down walls can corrode framing over time, which is why a continuous vapor control layer matters.

Steel spans wider without interior posts and suits big shop bays and open great rooms. Wood post-frame costs less to frame and is simple to finish inside. We price both for the same plan when you are undecided.