No. Appraisers do not report unpermitted work to the building department, code enforcement, or any other authority. Their job is to estimate market value, not to police permits. But they cannot ignore what they see either: when an appraiser spots signs that an addition, conversion, or finished space was built without permits, they are required to describe it in the appraisal report and address how it affects value. That report goes to the lender, and the lender’s reaction is often what actually derails a sale.
What an Appraiser Is Actually There to Do
An appraiser delivers an unbiased opinion of market value. That is a different role from a home inspector, who evaluates structural and mechanical condition, and from a code enforcement officer, who checks compliance with building codes. Appraisers are not trained or hired to pull permit histories from the local building department, and no federal standard requires them to run a permit search as part of a routine appraisal.
What they are required to do is look at the property, note its features, and assess how those features affect marketability. When something looks off, they document it. Under Fannie Mae’s guidelines, if an appraiser identifies an addition that does not have the required permit, the appraiser must comment on the quality and appearance of the work and its impact on the property’s market value.1Fannie Mae. Improvements Section of the Appraisal Report So while appraisers are not hunting for permit violations, they are not going to pretend they didn’t see them.
What Tips an Appraiser Off
Appraisers develop an eye for construction that doesn’t match the rest of the home. Common signals include additions where the roofline, siding, or finish quality doesn’t match the original structure. A bedroom with a lower ceiling, different flooring, or no closet can point to a garage conversion. Finished basements with exposed wiring or missing egress windows raise similar questions.
Public records are another trigger. If the county assessor’s records show a 1,400-square-foot home but the appraiser measures 1,800, that 400-square-foot gap usually points to an addition that was never permitted and never recorded. The same is true when room counts don’t line up: a home listed in tax records as a three-bedroom but marketed as a four-bedroom invites scrutiny about when the extra room appeared.
None of this means the appraiser picks up the phone to call the city. It means the appraiser will note the discrepancy in the report and flag it for the lender.
How the Appraiser Writes It Up
Appraisers working on loans backed by Fannie Mae, Freddie Mac, FHA, or VA follow specific reporting standards. Fannie Mae’s Selling Guide is the most explicit: when the appraiser identifies an addition without the required permit, they must comment on the quality and appearance of the work and address its impact on market value.1Fannie Mae. Improvements Section of the Appraisal Report In practice, the appraiser describes the space (“approximately 300 sq ft finished area over the garage”), notes any quality or safety concerns, and typically adds a comment recommending the lender verify permits with the local jurisdiction.
The language is deliberately careful. Appraisers rarely write “this is unpermitted work” unless they have confirmed it through public records. More often, the report says the addition “does not appear in county records” or advises the client to “verify that permits were obtained for this improvement.” That phrasing gives the lender enough information to act without the appraiser overstepping their expertise.
How It Hits the Appraised Value
The valuation impact depends on what type of work was done, how well it was done, and whether the local market cares. A professionally finished basement in a neighborhood where every comparable home has one might retain most of its value contribution even without a permit. A poorly built bedroom addition with visible code issues is a different story.
Square Footage That Doesn’t Count
One of the biggest financial hits comes from how square footage is calculated. Under Fannie Mae’s guidelines, appraisers must follow ANSI measurement standards when calculating above-grade and below-grade living area.1Fannie Mae. Improvements Section of the Appraisal Report If an unpermitted addition cannot be verified as meeting code, the appraiser may exclude it from the gross living area entirely, or report it separately as nonstandard finished area. Either way, the home effectively shrinks on paper, and price-per-square-foot comparisons drag the appraised value down.
Below-grade finished space gets even stricter treatment. Fannie Mae considers any level with any portion below grade to be below-grade, regardless of finish quality or window count. A walkout basement with $50,000 in finishes still gets reported separately from above-grade square footage.1Fannie Mae. Improvements Section of the Appraisal Report When that space is also unpermitted, the value contribution shrinks further because the appraiser has less confidence in the quality of work behind the walls.
The Risk Discount
Beyond square footage, unpermitted work introduces uncertainty that appraisers factor into their valuation. A buyer inheriting unpermitted work takes on the risk of future code enforcement action, the cost of retroactive permitting, and potential resale problems. Appraisers account for these risks when selecting comparable sales and making adjustments. The result is almost always a lower appraised value than a similar home where the work was properly permitted.
What the Lender Does With the Flag
The appraisal report goes to the lender, not to the city. But lenders have their own reasons to care about unpermitted work, and their response can be just as consequential as a code enforcement visit.
When an appraisal flags potential unpermitted additions, lenders commonly take one of several steps. They may lower the loan amount, because if the appraised value comes in below the purchase price the buyer has to cover the gap in cash or renegotiate. They may condition the loan on proof that permits were obtained, or require the seller to legalize the work before closing. And for government-backed loans, they may deny the loan entirely. VA appraisals in particular may flag unpermitted additions that raise safety concerns, and the VA can deny the loan if those concerns are not resolved.
FHA and USDA loans carry similar scrutiny. These programs have minimum property standards, and unpermitted work that fails those standards can stop a transaction cold. Even conventional lenders, who generally have more flexibility, get nervous about financing a property with significant undocumented construction because it complicates their collateral position.
Insurance and Disclosure Risks You Should Know About
The consequences of unpermitted work reach past the appraisal itself.
Insurance Gaps
If damage occurs in a part of your home that was modified without permits, your insurance company may deny the claim. The logic is straightforward: unpermitted work was never inspected, so the insurer argues it may not meet code. An electrical fire in an unpermitted room addition is the classic example. Some insurers go further, excluding coverage for portions of the home with known unpermitted work or cancelling the policy altogether if they discover unpermitted modifications during a claim investigation or routine inspection. Conditional coverage or policy riders may be available while you are legalizing the work, but not every carrier offers that option.
Seller Disclosure Obligations
Most states require sellers to disclose known unpermitted work to buyers, even if the work was done by a previous owner. The key word is “known.” A seller who bought the home unaware that a prior owner converted the garage without a permit may have no liability for that omission. But a seller who did the work themselves, or learned about it and stayed quiet, faces potential claims for failure to disclose, misrepresentation, or fraud. Courts have held sellers liable even when the unpermitted work predated their ownership, as long as the seller knew about it and did not tell the buyer.
Legalizing Work That Was Never Permitted
If you own a home with unpermitted work, or you are a seller trying to clean up issues before listing, the retroactive permitting process follows a predictable pattern in most jurisdictions. It is not quick, and it is not cheap, but it is almost always cheaper than the value you lose by leaving the work unpermitted.
Many building departments will do a preliminary courtesy inspection to give you a realistic scope. From there, you prepare design plans of the existing work, submit them, and apply for a retroactive permit. Structural, electrical, or plumbing work generally requires plans prepared by a licensed architect or engineer. Expect the permit fee to be significantly higher than a standard permit, with many jurisdictions charging double the normal fee as a penalty. Inspectors will need access to what’s behind the walls, which often means opening drywall, flooring, or ceilings. Anything that fails current code has to be corrected before the permit is approved.
The timeline typically runs two to six months. Costs vary widely by jurisdiction and scope. Straightforward projects may stay in the low thousands; major additions that need substantial rework can climb well beyond that.
Buying a Home With Unpermitted Work
Discovering unpermitted work during the buying process does not have to kill the deal, but it does change the negotiation. The most common path is a price reduction: calculate the cost to legalize the work, including permit fees, contractor work, and engineering review, and ask the seller to reduce the price by that amount plus a cushion for the hassle and uncertainty. You can also require the seller to permit the work before closing, though that can add months to the timeline, so get specific dates in writing. For major systems, a licensed home inspector or structural engineer can evaluate whether the work is actually safe and well-built, even without a permit, so you know the real risk. And if the unpermitted work is extensive or affects major systems and the seller will not negotiate, walking away is sometimes the right call.
Call your insurance company before you close. Some carriers restrict coverage for homes with known unpermitted work, and finding that out after you have signed is a problem you can avoid with one phone call.