Buying a House With Unpermitted Work in Middle Tennessee
Updated: Oct 16
What happens if you buy a house with unpermitted work in Tennessee?
Unpermitted work follows the house, not the person who did it, so the problem becomes yours at closing. The three real consequences are appraisal, insurance, and resale: an appraiser can exclude unpermitted square footage from gross living area, which lowers your appraised value and can open a financing gap; an insurer can deny a claim tied to that work or add an exclusion; and the next buyer will ask the same questions you should be asking now. Check permit records before your inspection period ends, not after.
By Khristian Schlemmer | September 8, 2026
The finished basement is beautiful. The sunroom off the back is the reason you want the house. The detached shop is exactly what you have been looking for.
And none of it shows up in the county's records.
Unpermitted work is far more common than most buyers expect. Industry estimates put it in something close to half of American homes, and older houses in particular carry decades of undocumented changes. In Middle Tennessee it usually looks like one of a handful of things: a garage converted to living space, a screened porch enclosed and heated, a basement finished out with a bathroom, a bonus room added over the garage, a deck or a detached shop built on a weekend, or a second kitchen installed for a family member.
None of that is automatically a deal killer. But it is a due diligence item with real dollars attached, and it is one your home inspector is not going to research for you.
How to spot it before you even make an offer. Look for the seams. A slight step down into a room. Ceiling height that changes between spaces. Exterior walls that do not line up. Siding or brick that almost matches. Finishes in one room that feel five years newer than the rest of the house. When the listing says "1,850 square feet" but the county's assessor record says 1,450, something got added along the way.
The three things unpermitted work actually costs you
It can cost you square footage on the appraisal. This is the one that blows up deals. Appraisers follow ANSI measuring standards and agency collateral guidelines, and when added space has no permit closure behind it, the appraiser can classify it as non-GLA and give it little or no value. A 400 square foot bonus room in a market running $200 per square foot is $80,000 of value that may simply not count. If you offered based on the marketed square footage, you now have an appraisal gap and a decision to make.
Financing gets tighter too. Conventional and FHA underwriting is not enthusiastic about unpermitted additions, and how a specific lender treats one depends on the appraiser's write-up and the underwriter's read. Which means the answer is unknowable until you are already spending money. That is exactly why you want this identified in week one.
It can cost you an insurance claim. Insurers exclude faulty workmanship. If an unpermitted electrical run in that finished basement starts a fire, or unpermitted plumbing behind a wall rots out a floor, the carrier has a straightforward argument for denial. Beyond claims, a carrier that learns about the work can raise your premium, add a specific exclusion, or non-renew you.
To be fair about it: an unpermitted bathroom does not void your whole policy. If a tree falls on the garage, the tree damage is still covered. The exposure is tied to the work itself.
It costs you at resale. Whatever you decide to do about it, you will disclose it when you sell, and the buyer behind you will run the same math. If you paid full price for the square footage and then sell to someone who does not get value for it, you absorbed the difference.
There is also the enforcement question. Codes departments can require that unpermitted work be permitted, corrected, or in the worst case removed. It is not the most common outcome, but it is a real one, and it typically surfaces when you pull a permit for something else and an inspector notices.
How to check permits in Wilson County and around Middle Tennessee
This is the step almost nobody takes, and it is free.
In Wilson County, the Building Codes Division sits in the Courthouse Annex at 233 East Gay Street in Lebanon, and you can reach them at (615) 444-3025. Permit applications are processed Monday through Friday from 8:00am until 3:30pm. There is no online permitting portal for the county, so this is a phone call or a walk-in rather than a database search from your couch. Metro Nashville and several surrounding jurisdictions do publish permit records online, so if the house is in Davidson County you can often check from your phone in ten minutes.
What to ask for and what to compare:
Pull the permit history for the address. You want every permit issued and, more importantly, whether each one received a final inspection or certificate of occupancy. An open permit with no final is its own problem.
Compare the assessor's recorded square footage to the MLS square footage. A meaningful gap means something was added that the county never recorded.
Ask the seller directly, in writing. When was the basement finished, who did it, and was it permitted. Get the answer in an email or an amendment, not in a hallway conversation.
Ask your inspector to flag anything that looks added. Inspectors do not verify permits, but a good one will note construction that does not match the original build.
Two Wilson County details worth knowing. Floor plans are required for additions, ADUs, new homes, and mobile homes, so a legitimate addition should have paperwork behind it. And a residential building permit here is not open-ended: it cannot run longer than 24 months without a certificate of occupancy or other final approval. A permit pulled in 2019 that never closed out is not protection.
You found unpermitted work. Now what?
Do not panic, and do not walk away on reflex. Work the sequence.
1. Define exactly what is unpermitted. A deck without a permit and a bedroom addition without a permit are not the same problem. Structural, electrical, plumbing, and anything involving egress carry real safety weight. A shed usually does not.
2. Get a contractor to price the path to legal. A retroactive permit is often possible, but it is rarely just a fee. The county may require plans, an engineer's letter, and inspections, and inspections mean opening walls so someone can see the wiring and framing. The permit fee is the cheap part. The corrections are the expensive part, and you need a written number before you negotiate.
3. Call your insurance agent before you take a binder. Describe the work honestly and ask two questions: will you cover this house, and will you exclude anything. Finding out at renewal is far worse than finding out during your inspection period.
4. Talk to your lender. Send the situation to your loan officer early so the underwriter is not seeing it for the first time on the appraisal.
5. Then negotiate one of three outcomes. Ask the seller to permit and correct the work before closing, which is cleanest but slowest. Ask for a credit sized to the written contractor estimate, which is faster but leaves the project on your plate. Or renegotiate price to reflect square footage that will not appraise. Which one fits depends on your timeline and how badly you want the house.
Your position for that conversation is stronger than it would have been a few years ago. Greater Nashville reached 4.92 months of supply in July 2026, the highest July reading in at least three years, and close to 60% of Nashville listings had taken a price cut. Lebanon homes were sitting a median of 58 days in August 2026, and Wilson County was running about 73 days versus 57 a year earlier. A seller looking at those numbers is more willing to solve a documented problem than to start over with a new buyer who will find the same thing.
If you do negotiate repairs or a permit, confirm the work and the paperwork are actually done when you do your final walk-through. "The contractor is coming Thursday" is not a closing condition.
If you are the seller in this story
The Tennessee Residential Property Condition Disclosure asks you about additions and alterations made without required permits, and the standard is what you actually know. If you finished the basement yourself, or you bought the house knowing about the sunroom, that belongs on the form. Guessing wrong in the direction of silence is how sellers end up in a dispute after closing.
The better play is usually to get ahead of it. Price the retroactive permit before you list, decide whether to do the work or disclose and price accordingly, and hand the buyer a documented answer instead of a surprise on day six of their inspection period. Deals fall apart over the surprise far more often than over the item itself.
Frequently Asked Questions
How do I find out if work on a house was permitted in Wilson County, TN?
Contact the Wilson County Building Codes Division at the Courthouse Annex, 233 East Gay Street in Lebanon, or call (615) 444-3025 during business hours. Wilson County does not offer an online permitting portal, so permit history is requested directly from the department. Metro Nashville and some neighboring jurisdictions do publish records online.
Can you get a mortgage on a house with an unpermitted addition?
Often yes, but not always, and the unpermitted space may get little or no value in the appraisal. Appraisers can classify added square footage without permit closure as non-GLA, which lowers the appraised value and can create a gap between your offer price and what the lender will finance. Send the situation to your loan officer early.
Will homeowners insurance cover unpermitted work?
Coverage for damage arising from the unpermitted work itself is the risk. Carriers exclude faulty workmanship, so a claim tied to unpermitted electrical or plumbing can be denied, and an insurer that learns about the work may add an exclusion or raise your premium. Unrelated covered losses are still covered.
Does a seller in Tennessee have to disclose unpermitted work?
The Tennessee Residential Property Condition Disclosure asks about additions and alterations made without the required permits, and sellers must disclose what they actually know. A blank answer does not confirm the work was permitted, so buyers should verify with the county rather than rely on the form alone.
Is it worth buying a house with unpermitted work?
It can be, if you price it correctly. Get a written contractor estimate for permitting and correcting the work, confirm with your insurance agent and lender, and then negotiate the price or a credit to match. The mistake is paying full square-footage value for space the appraiser and the next buyer will discount.
The short version
Unpermitted work is common, fixable, and expensive to ignore. Pull the permit history, compare it to the marketed square footage, price the path to legal in writing, and negotiate from that number. It belongs on the same due diligence list as checking for sinkholes in Wilson County, and unlike most of that list, this check costs you a phone call.
If you are under contract and just found something in the file that does not add up, send it to me. I have worked through plenty of these, and there is almost always a path. Reach out anytime.
About Khristian Schlemmer
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Khristian is a top-producing Middle Tennessee Realtor and founder of First Class Real Estate, serving buyers, sellers, and investors throughout the Greater Nashville area. With over $75 million in career sales and 300+ homes sold, he is known for creative marketing, strong negotiation, and delivering a true first-class client experience. Born into a family passionate about real estate investing and home building, Khristian combines local market expertise with modern marketing strategies to help clients confidently achieve their real estate goals.
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