How Long Does It Take to Build a Barndominium in Tennessee?
Barndominiums have a reputation for going up fast, and the reputation is half right. The shell closes in early. The house takes about as long as any other house. What is genuinely different in Tennessee is the order the paperwork has to happen in, because septic runs on its own clock and in several counties that clock has to finish before the building permit clock starts. On raw acreage that makes the soil work, not the plan set, the real start date. Below is what the Census Bureau measures, what individual Tennessee jurisdictions publish about their own review and inspection times, and where a schedule actually stalls.
Figures below are industry data from cited third-party sources, not a quote from Tennessee Barndominium Builders. Every project is priced individually.
The baseline: what a house actually takes
The Census Bureau's Survey of Construction measures this every year and splits it by who managed the job. It is the right place to start, because it is survey data rather than anyone's claim, and it reframes the question from what the building is made of to how it is run.
About nine months, authorisation to keys
Single-family homes completed in 2024 averaged 9.1 months from authorisation to completion: 1.4 months between authorisation and construction actually starting, then 7.6 months of construction. Those are national averages across every kind of single-family home, and they are the number a barndominium should be measured against rather than the shell-erection time people quote. Figures from the US Census Bureau Survey of Construction, 2024 completions, as reported by NAHB Eye On Housing in September 2025.
Who manages the build changes the answer more than what it is made of
The same survey splits completions by purpose of construction and the spread is dramatic. Homes built for sale took 7.6 months. Contractor-built homes took about 12 months. Homes built for rent took about 12.5 months. Homes built by owners took 15.1 months, roughly double the built-for-sale figure. Nothing in a framing method produces a gap that size. The management model does.
The owner-built figure is the one to read carefully
Buying a shell and finishing the interior yourself is one of the most common routes into this building type, and it is exactly the owner-built category the Census measures at 15.1 months. Trading time for money that way is a legitimate strategy and plenty of people are happy with it. It is worth going in knowing the size of the trade, because the data puts a number on what is usually described as a feeling.
What the fast shell time actually measures
A clear-span frame can be stood and sheeted quickly, and that is real. It closes the envelope early, which means the long interior phase runs under cover rather than exposed. But erection is one line on a schedule that also contains soil evaluation, septic permitting, engineering, plan review, foundations, four trades, and an inspection sequence that ends in a certificate of occupancy. The shell being quick does not shorten any of the others.
The septic clock, and why it often runs first
This is the part of a Tennessee schedule that most content on the subject skips entirely. Septic is a separate permit, from a separate office, on a separate clock, and several counties will not accept or issue a building permit until it is done.
Jefferson County's four steps, in the county's published order
Jefferson County Environmental Health publishes the sequence: obtain the septic permit first, having staked the four corners of the proposed house site and supplied a recorded plat map and a soil map from a soil scientist; then obtain the building permit, bringing the septic permit, surveyor's map and deed; then obtain a 911 address, which requires the building permit; then the septic final, which the installer calls in before the system is covered and which needs both the building permit and the 911 address to hand. Four desks, in a fixed order, and the first one wants a survey.
Cumberland and Jefferson run the 911 address in opposite directions
Cumberland County lists the 911 address among the items that must be provided in order to apply for a building permit, alongside the septic permit and layout, proof of a contractor's licence, workers' compensation cover or an affidavit of exemption, and a county business licence. Jefferson County's 911 address is issued the other way round, after the building permit and on the strength of it. Same two documents, opposite order, and both counties are perfectly clear about their own version. It is a good illustration of why a sequence copied from a neighbouring county is worth nothing.
Blount County puts a geology and soils analysis ahead of the septic application
Step two of the county's eighteen-step checklist is a Geology and Soils Analysis where the parcel is not on sewer and not in an already-approved development, and the county's note says it must be completed before applying for the septic permit, allowing up to 15 days. On a mountain parcel that is where a build is decided, not merely delayed. The drainfield site evaluation that follows allows up to a further 10 days. Neither of those steps produces anything visible on site, which is why they are the ones people leave out of their own estimate.
Sevier County's queue is posted, and the paperwork before it is not trivial
Sevier County Environmental Health's posted processing time for new septic applications is 3 weeks, longer where information is missing or multiple visits are needed. Before that clock starts the applicant needs a high-intensity soil map of the proposed disposal area prepared per department rules, and a plat sealed and signed by a registered surveyor. A soil scientist and a surveyor both have their own lead times, and neither is bookable retrospectively.
Where TDEC runs it directly, the file is state-held
Wilson County's Building Codes Department sends septic questions to the TDEC field office and requires septic records for every new home, with a TDEC inspection letter and a notarised affidavit where records are unavailable. Putnam County's published permit steps say to purchase the septic permit from the state environmental office. Loudon, Cumberland, Bradley, Sumner, Robertson and Maury all point at TDEC as well. It is not slower or faster as a rule, but it does mean there is no local counter to walk into and the field office serves a wide area.
Where the county runs it, the whole chain is usually in one building
Jefferson, Blount, Sevier, Hamilton, Knox, Williamson, Nashville and Davidson, and Memphis and Shelby County each administer subsurface sewage disposal locally. Blount County's position is worth noting for anyone building inside a city there: both Alcoa and Maryville amended their adopted codes to send private sewage disposal back to the county department, so a city parcel on septic still goes through the county office. A local programme generally means a local phone number, a published fee schedule and a published queue, which is easier to plan around even when the queue is long.
Everything that happens before you submit anything
This is the phase people leave out of their own estimate, because nothing visible is happening during it. It is also the phase where a schedule is most often lost.
The engineering is not an optional step for this building type
IRC R301.1.1 lets a house be built to one of a short list of prescriptive standards, and a conventional stick-built house usually fits one of them. A clear-span rigid frame or a post-frame building fits none, so R301.1.3 applies and those elements must be designed in accordance with accepted engineering practice. The feature that makes a building a barndominium is the same feature that takes it off the prescriptive path. That engineering happens before the submittal, not during review, and it is the single most compressed item in most people's mental timeline. Both of those section numbers are stable across the code editions in use in Tennessee, which is not true of every number in that chapter.
Rutherford County has written the requirement into its own procedure
Rutherford County's residential plans review list includes "Pole barn type structures with living space regardless of square footage", and adds that drawings for pole barns or pre-manufactured steel structures intended for occupation "shall be design drawings prepared and sealed by a Tennessee Registered Architect or Engineer", labelled as designed to meet the edition of the residential code the county has adopted. The county allows a minimum of three working days for that review. Other house types in the same list are reviewed for life-safety items only and do not need certified architectural drawings. This building type is singled out by name, which means the standard is knowable up front instead of discovered at inspection.
Washington County answers the same question in its own FAQ
Washington County states that barndominiums are allowed anywhere single-family dwellings are, and that stamped drawings from a design professional are required for all alternative construction methods. Robertson County's pre-permit list is more specific still and requires that the truss document carry a Tennessee engineer stamp. Memphis and Shelby County's submittal FAQ answers that an engineer's letter or structural calculations are needed for new buildings, additions and any structural reconfiguration. Four separate jurisdictions, arriving at the same place from four different directions.
The other desks run in parallel, and some of them gate the ones after
Blount County lists a state electrical permit application as its own step, ahead of the building permit application. Wilson County requires a passed state electrical rough-in on file before it will carry out the framing inspection. Loudon County's electrical inspections are performed by state inspectors. Robertson County requires a driveway permit for all new buildings from the county highway department, which is closed on Fridays, plus a 911 Address Verification Letter for all new construction. None of these takes long on its own. Missing one of them stops everything behind it.
Stormwater has its own review in several places
Blount County allows up to 10 days for a storm water site review as a separate step from the building plans review. Washington County puts Storm Water first in its published inspection list, ahead of the setback inspection. Williamson County puts it last, after the final building inspection. It is a small item that lands at three different points in three different counties, which is a fair summary of Tennessee permitting generally.
Review and issue: the clocks jurisdictions actually publish
Only a minority of Tennessee jurisdictions publish a review time at all. Where one is published it is quoted here and attributed. Where it is not, the honest answer is to ring the department rather than trust a figure from a national article.
Rutherford County: 24 to 48 hours, plus three working days for a sealed set
The county's own pages say that once it receives all building permit documentation, applicants should allow 24 to 48 hours for a permit to be complete, with walk-ins welcome but no guarantee, and that permits must be physically collected because they need an in-person signature. A pole barn type dwelling adds the minimum three working days of plans review on top, because it is in the category the county requires a sealed design for. Inspections there are described as 24 to 48 hours out, with a request made by 3:00 pm attracting an attempt the following day.
Murfreesboro: up to two weeks
The City of Murfreesboro's residential permits page states that processing of applications can take up to two weeks. The city runs its own plan review and inspections from City Hall, and its inspectors are in the office between 8:00 and 8:45 each morning for questions, which is a genuinely useful window for a builder trying to settle a detail without losing a day.
Jefferson County: a two-day minimum, and it is a minimum
The Jefferson County Building Department FAQ says a two-day waiting period for the reviewing of plans is required, and that some plans may require additional time. It is the only building-side figure the county publishes, and on a septic parcel the realistic path is much longer than two days because the septic permit has to be issued first.
Memphis and Shelby County: 7 to 20 working days on average
The construction code enforcement office's submittal FAQ answers the review timeline question directly: it depends on the work load, but on average 7 to 20 working days. The same document asks for four sets of plans and sets a minimum plan size, and confirms that an engineer's letter or structural calculations are required for new buildings. The satellite cities inside the county each run their own approval procedure on top.
Loudon County issues at the counter; Gallatin publishes three to five days
Loudon County's residential permit information says applications are filled out in office at the time the permit is being obtained, with no plan submittal step and no plan review fee for a one- or two-family dwelling. The City of Gallatin, in Sumner County, publishes that residential building permits require a minimum turn-around of three to five days. Two very different models inside one state, and neither is a safe assumption about the other.
Most of the rest publish nothing, and old figures circulate
Nashville and Davidson, Knoxville and Knox County, Chattanooga, Clarksville and Montgomery County, Williamson, Wilson, Sumner County, Maury, Sevier, Cumberland, Bradley, Washington and Putnam publish no residential review turnaround on their permit pages. Figures for some of them do circulate online. At least one widely repeated number for a major East Tennessee county traces back to an operations study whose underlying data was collected in 2004, and a county advertising round-the-clock permitting is usually describing portal availability rather than review time. Ask the department and write down what they say.
The inspection sequence, and what it waits on
Inspections do not lengthen a build by themselves. They add points where the schedule waits on somebody else's calendar, and the counties that publish their sequence make those points visible in advance.
Putnam County publishes seven, and a list of things that must be on site first
Putnam County's seven required inspections, stated as required for all structures, are: footer before concrete is ordered; foundations, anchor bolts, sill plate and drains around basements; plumbing in slabs where required; concrete slabs; rough-in framing, plumbing and mechanical all in one; energy, covering insulation values or trade-offs; and final before habitating the building. Before any inspection at all the county wants access to a portable toilet, a crushed stone ramp to keep mud off the road, straw bales or silt fences or other erosion control in place, the address posted to 911 specification, and the building permit posted on site. Turning up short of any of those is a wasted trip.
Washington County lists ten, and takes requests by 3:00 pm the day before
Storm Water, Setback, Foundation and Footing, Slab, Plumbing Slab, Plumbing, Mechanical, Framing, Insulation, and Final ready to occupy. The county's addendum states in capitals that all inspections must be scheduled by 3:00 pm the day prior. One re-inspection is included at no charge and further ones are chargeable in advance. The applicant must mark and maintain the property-line corners for the whole term of construction, and the final covers paving, driveway entrance, seeding and positive drainage away from the building. Worth noting that the county's own permit form has a Construction Type checkbox offering Conventional or Post frame.
Montgomery County's Framing #1 is a structural inspection, before the wrap goes on
The county that surrounds Clarksville publishes an inspection-by-inspection description, and the one that matters most for a clear-span frame is Framing #1, Structural: no exterior veneer, no house wrap, no electrical rough-in, no plumbing rough-in, no insulation, and the inspector will be looking at wall bracing, looking at all load paths, and checking the spans of all joists, beams, studs and rafters. Framing #2, Insulation, comes later, after the electrical rough-in is approved and with the wrap and veneer on. That first inspection is the engineered design being checked in the open, which is why the design has to exist long before the framing crew arrives.
Wilson County gives its inspectors 72 business hours, and gates framing on electrical
The county's sequence runs setback, plumbing in slab, foundation, block or basement wall, framing with plumbing and mechanical rough-in together, insulation, and final. Its notice says inspectors have 72 business hours to conduct inspections. A passed state electrical rough-in must be on file before the framing inspection happens, so two separate authorities have to line up at the same point in the build. The setback inspection is only required where the lot is under five acres and no stamped surveyed plot plan was provided at application.
Williamson runs ten, Bradley five, and Maury ends on a blower door test
Williamson County inspects footings, foundation, slab, slab plumbing, framing, mechanical, plumbing, insulation, final building for the certificate of occupancy, and storm water. Bradley County runs five: footing, foundation, framing, insulation and energy, and final, with the footing trench dug no less than twelve inches below grade and foundation anchor bolts to a stated prescriptive default or as designed by engineer. Maury County adds an energy inspection both before sheetrock and at final, and a blower door test that must be turned in before the certificate of occupancy will be issued.
The scheduling rules matter as much as the count
Loudon County wants 24 hours' notice through its automated line and states that it is unlawful to occupy a structure before obtaining a certificate of occupancy. Maury County asks for at least 24 hours and requires a posted permit, a copy of the plans and a job box on site, with a portable toilet in place by the foundation inspection. Bradley County books on a minimum of 24 hours. None of these is onerous. All of them turn a missed morning into a lost day, and on a job with ten inspection points those days add up faster than any single review queue.
How long the permit stays alive once you have it
Getting the permit is not the end of the clock. Several Tennessee jurisdictions publish expiry rules that bear directly on the finish-it-slowly approach, which is exactly the approach a lot of people buying a shell have in mind.
Wilson County: 24 months to a certificate of occupancy
The county states that in no case shall an active building permit for a residential dwelling last longer than 24 months without having received a certificate of occupancy, and that relief beyond that requires a variance from the Board of Zoning Appeals. Two years is generous by the standards below, but it is a hard outside edge for anyone planning to finish the interior over several seasons.
Rutherford County: 180 days of inactivity, two years overall
A Rutherford County permit becomes invalid if work is not commenced within 180 days, or if 180 days pass between inspections, and every building permit expires two years from issue. The county also applies a double permit fee where work is commenced before a permit is issued, waivable by the building official for good cause. The 180-day inspection gap is the one that catches self-managed builds, because a long pause between trades is exactly what a self-managed build produces.
Chattanooga: 30 days to start, then a completion window set by valuation
The city's amendment to the residential code makes a permit invalid unless work commences within 30 days of issuance, and then sets a completion window that rises in bands with the declared valuation of the work, starting at 12 months for the lowest band and reaching 36 months at the top. Extensions are available in periods of up to 180 days on written request showing justifiable cause, with a fee set as a percentage of the contract value. It is one of the more precisely drafted permit-life provisions in the state.
Washington County and Shelby County both run 180-day rules
In Washington County the permit becomes invalid unless work is started within 180 days, and expires if no inspection is requested for 180 days. In Memphis and Shelby County a permit lapses if work is not commenced within 180 days, and an expired permit means starting over with a new application and a new plan review fee. That second consequence is the one worth planning around, because it converts a lapsed permit from an administrative nuisance into a repeat of the whole submittal.
The septic permit has its own life too
Sevier County's septic permits expire three years from issue, are not renewable, and are transferable. So a buyer who perc-tests a parcel, permits the system and then waits has a second expiry date running alongside the building permit, on a different calendar, from a different office. Where the septic permit had to come first, letting it lapse puts the reader back at the start of the sequence rather than partway through it.
Reading this because you are weighing a build? The next step is a plan drawn for your program.
What's different about Tennessee
In several counties the septic permit has to be issued before the building permit
Jefferson County states it plainly in its published order of operations: obtain the septic permit first, and "You must have your septic permit in hand before you move to step two." Cumberland County lists a copy of the septic permit and layout among the five things that must be provided in order to apply for a building permit. Bradley County's permitting process document says it is required that the county have a copy on hand before it can issue the building permit. Robertson County puts the septic permit or sewer tap receipt at the head of its pre-permit list. Loudon County has it on the residential permit checklist and will not pass the final inspection until the subsurface sewage disposal Certificate of Completion is issued. In all of those places the drainfield, not the drawing set, sets the start date.
Jefferson County wants the house corners staked before the septic application
The same Jefferson County process page requires that "You must stake out your proposed house site (four corners) prior to submitting your application," and outside a subdivision the applicant supplies a recorded plat map and a soil map from a soil scientist. That fixes the footprint before the building permit application exists and long before anyone reviews a plan. For a building type whose appeal is a flexible footprint, it is the least obvious constraint on the whole schedule, and it is worth knowing before a plan is finalised rather than after.
Who issues the septic permit changes from county to county
Subsurface sewage disposal is a Tennessee Department of Environment and Conservation programme under Rules 0400-48-01, but a number of counties administer it locally, and that changes who the reader phones and how long the queue is. TDEC's own third-party page names Blount, Davidson, Hamilton, Jefferson, Knox, Madison, Sevier, Shelby and Williamson. Among the counties this site covers, Wilson, Putnam, Loudon, Cumberland, Bradley, Sumner, Robertson and Maury all send applicants to a TDEC field office instead. Two neighbouring parcels can therefore sit in front of two entirely different desks with two different waiting times.
Blount County publishes a day allowance for every step, and the soils work is the longest
Appendix E of the Blount County Permitting Process Reference Manual sets out eighteen steps for a one- or two-family dwelling with the county's own timings against them. A Geology and Soils Analysis comes second and carries the note "Must have completed before applying for septic permit. Allow up to 15 days." The drainfield site evaluation allows up to 10 days, the storm water site review up to 10 days, and building plans review "up to 5 days residential." The manual is careful to say the allowable times are estimates that could change case by case, and separately that residential plan review normally takes three to five business days for a complete set of plans. It is the most useful scheduling document any Tennessee county publishes, because it lets a buyer build a calendar from the county's own figures.
Sevier County has posted a three-week septic processing time
Sevier County Environmental Health publishes a notice stating that because of staffing and a continued increase in applications, the processing time for new septic applications will be 3 weeks, and that incomplete information or repeat visits will make it longer. The application also calls for a high-intensity soil map of the proposed disposal area prepared per department rules and a plat sealed and signed by a registered surveyor, both of which have to be commissioned before the clock even starts. Sevier publishes no building permit review time, so the three weeks is the septic queue and nothing else.
Pros and cons, honestly
Pros
- The shell closes the envelope early, so the long interior fit-out runs under cover rather than exposed to the weather.
- The Census Bureau's Survey of Construction puts single-family homes completed in 2024 at 9.1 months from authorisation to completion, so a barndominium is measured against an ordinary house schedule rather than an exotic one.
- Some Tennessee jurisdictions are genuinely quick: Rutherford County asks for 24 to 48 hours once it has all the documentation, and Loudon County fills the application out at the counter with no plan submittal step for a one- or two-family dwelling.
- Blount County publishes a day allowance against every step of its eighteen-step checklist, which means a buyer there can build a realistic calendar from the county's own document instead of guessing.
- Where a county runs its own septic programme, as Jefferson, Blount, Sevier, Hamilton, Knox, Williamson, Davidson and Shelby do, there is a local counter, a published fee schedule and a knowable queue.
- Rutherford County names this building type in its plans review requirements, so the standard a sealed drawing set has to meet is knowable before the design starts rather than after it is submitted.
Cons
- Census data puts owner-built homes at 15.1 months against 7.6 months for homes built for sale, so self-managing the finish roughly doubles the timeline.
- The engineering and plan production that precede any submittal are routinely left out of people's own estimates, and a clear-span or post-frame building has to be engineered rather than built to a prescriptive standard.
- In Jefferson, Cumberland, Bradley, Robertson and Loudon counties the septic side has to be resolved before the building permit is applied for or issued, which puts soil work at the front of the schedule on raw acreage.
- Blount County allows up to 15 days for the geology and soils analysis that has to be finished before the septic application, and up to a further 10 days for the drainfield site evaluation.
- Sevier County Environmental Health has posted a three-week processing time for new septic applications, and the soil map and sealed plat it requires have to be commissioned before that clock starts.
- Fourteen of the twenty jurisdictions this site covers publish no residential review turnaround at all, so the expected wait has to be confirmed with the department rather than looked up.
- Permit expiry rules constrain a slow finish: Rutherford County voids a permit after 180 days between inspections, Washington County after 180 days without one, and in Memphis and Shelby County a lapsed permit means a fresh application and a fresh plan review fee.
Common questions
8 questions people ask most about barndominium cost. If yours is not on the list, ask it directly.
How long does a barndominium take to build in Tennessee, realistically?
Do I really have to get the septic permit before the building permit?
Who issues the septic permit, the state or the county?
How long does plan review take?
How many inspections will there be?
What does the framing inspection actually check on a clear-span building?
Can I put the shell up now and finish the inside later?
Why won't you just give me a completion date?
Questions answered? Tell us what you want to build and we will put real numbers against it.
Keep reading
The pages that answer the next question this one raises.
Permitting & Engineering
The sealed engineering and the submittal that depends on it, which is the phase sitting in front of every clock on this page.
Read itSite Preparation
Soil evaluation, drainage, septic and utility runs, the work that in several Tennessee counties has to finish before the building permit is even applied for.
Read itCustom Plans
What a Tennessee-ready plan set contains, and why the drawings phase sets the fabrication lead time rather than the other way round.
Read itBarndominium Rules in Tennessee
Which authority enforces the residential code on your parcel, and why that answer is genuinely local and can change.
Read itWant a real number instead of a range?
Start your plans and we will come back with a budget for what you actually want to build, not a national average. Send the parcel ID or an address when you have one and we will price it against your land. That conversation costs nothing.