Can You Get a Mortgage on a House With Unpermitted Work?

Usually yes. A missing permit is almost never a mortgage rule by itself. What actually decides the loan is whether the appraiser can value the house as it stands, whether a carrier will insure it, and whether anything is recorded against the property. The permit record matters because it changes those three answers. So the work is getting all three on paper before your deadlines run.

The reason this feels frightening is that nobody tells you which question you are actually asking. A converted garage, a finished basement, a bathroom somebody added in 2011: the seller says the work is fine, the listing counts the square footage, and you cannot tell whether this is a paperwork problem or a real one.

I'm Jeff Moran, a mortgage broker in Bluffton, South Carolina, originating since 1996, NMLS #483943, through C2 Financial Corporation. I'm licensed in fifteen states. This question reaches me most often about four days before a due diligence period ends, which is the worst possible time to start asking it. Everything below can be started the day you see the house.

What counts as unpermitted work?

Any change to the structure that a local building department would have wanted to inspect, and did not.

The common ones, roughly in the order they show up:

• A garage converted to living space. The single most frequent version, and the one that changes the appraisal most.
• A finished basement or attic, especially with a bathroom added.
• An addition off the back or side, from a sunroom to a full bedroom.
• A separate living space with its own kitchen, bathroom and entrance. That is an accessory dwelling unit, and it has its own rules.
• Electrical, plumbing or mechanical work run to any of those.

Two of those raise a second question on top of the permit: whether the local zoning even allows what was built. Those are different problems. A permit is about whether the work was inspected. Zoning is about whether the use is allowed there at all. A room can be perfectly legal to have and still have never been inspected, and it can be beautifully built and still not be an allowed use.

Do the loan programs have a rule against it?

Not a permit rule, no. They have condition rules and zoning rules, and unpermitted work reaches the file through those.

Freddie Mac's property standards say a property has to be safe, sound and structurally secure and have an eligible zoning compliance, in Single-Family Seller/Servicer Guide Section 5601.1 (revised 02/04/2026). FHA states its version the same way: minimum property requirements mean a home insured by FHA is safe, sound and secure, and where defective conditions exist and correction is not feasible the lender must reject the property, in Handbook 4000.1, section II.A.3.a (revised 06/27/2025).

Read those carefully and you can see what is actually being asked. Nobody is asking for the permit. They are asking whether the work is sound and whether the use is allowed.

The clearest published example is the accessory dwelling unit, because Freddie wrote that case out in full. Under Section 5601.2 (revised 02/09/2026), a property whose ADU does not comply with zoning and land use requirements is still eligible when three things are true: the property is a one-unit property, the appraisal contains at least two comparable sales with a similarly non-compliant ADU to show the property is marketable, and the seller confirms the existence of the ADU will not jeopardize future hazard insurance claims. The same section says a two- or three-unit property with a non-compliant ADU is not eligible for sale to Freddie Mac.

That is worth sitting with, because it is the whole article in one rule. Even in the hardest version of this, the agency did not ask for a permit. It asked for market evidence and an insurance answer.

How does the appraiser treat it?

This is where most of the money moves, and it is not a pass-fail switch.

An appraiser is measuring value, not legality, and what an appraisal is actually measuring is worth understanding before you read one. On a house with unpermitted work the appraiser has to make two calls:

Whether the added space counts as living area. Square footage that was never inspected, or that is below grade, or that is reached only through another room, may not be counted the way the listing counted it. If the listing sold you 2,400 square feet and the appraisal recognises 1,950, the value is being built from a smaller house than the one you thought you were buying.

Whether comparable sales support it. Freddie's ADU rule points at exactly this, and the logic runs the same for a converted garage. If houses in that market with similar space have been selling, there is evidence. If nothing comparable has traded, the appraiser has less to work with, and that is a thin-market problem rather than a permit problem. It is the same effect that makes an older home an outlier on its street harder to value than an old house among old houses.

Separately, if the work looks unsafe, that is a condition call, and who calls for repairs and what a called item means covers what happens next. Most unpermitted work does not get called. Exposed wiring does.

What will the insurance carrier say?

Ask early, because this is the answer most likely to end a purchase, and the one people ask last.

A carrier is being asked to cover square footage that has no inspection record behind it. Some will write it without comment. Some will want documentation. Some will take a position on the addition specifically. Freddie's rule requiring a seller to confirm an out-of-compliance ADU will not jeopardize future hazard insurance claims exists because that risk is real.

Coverage has to be in place at closing, so a carrier saying no becomes a financing problem even though no lender rule was involved. That mechanism is the same one that makes insurance the quiet cause of failed closings generally. The move is an address-specific quote, and telling the agent plainly what was added and that it was not permitted. Getting a low quote by not mentioning the addition is not a win; it is a claim problem you have scheduled for later.

What should title and the closing attorney check?

One narrow question, and it takes a sentence to ask.

Unpermitted work is not usually a title defect. What it can become, in some jurisdictions, is an open code-enforcement action against the property, and in some of those places an unresolved action can attach as a lien. Whether that is true where you are buying is a local question with a local answer, so ask your closing attorney or title company directly: does this jurisdiction record code-enforcement actions against the property, and is anything open on this address?

If the answer is no, you have removed a risk in one email. If it is yes, you found it while you still have leverage.

How do I get the permit record, and how long does it take?

Longer than you think, and this is the step that decides whether the rest of the list is even possible inside your contract.

Start by finding out who issued permits for that address. Inside a town or city limit, the municipality usually issues and holds the record. Outside it, the county does. A property with a city mailing address is often not inside the city limits, so people request from the wrong office and lose a week.

Then price the clock. In my own market, Beaufort County publishes that building inspections records, including building permit files, are obtained by submitting a Freedom of Information Act request rather than through a public lookup (Beaufort County Building Inspections). The county's Freedom of Information Act FAQ states that records less than 24 months old must be made available within 30 calendar days, and records more than 24 months old within 35 calendar days.

Thirty to thirty-five calendar days. Compare that with a typical due diligence period and the problem is obvious: the record can arrive after the decision was due. That is not a South Carolina quirk. Versions of that timeline exist everywhere. Ask three questions on day one: who issued it, is there an online lookup, and if not, what is the published response time. Then set your contract dates against that answer rather than hoping. Keeping the financing contingency and the lender's clock on the same calendar is the same discipline applied to a different deadline.

What I see go wrong

• Asking the seller instead of the record. Sellers are frequently sincere and wrong. They bought it that way too.
• Starting the records request after going under contract. The clock above is why.
• Assuming the appraisal will confirm the square footage in the listing. It measures independently.
• Quoting insurance without mentioning the addition. A cheap quote on a house the carrier has not actually been told about is not protection.
• Treating a permit and a zoning question as one thing. Retroactive permitting fixes the first. It does not always fix the second.
• Walking away over paperwork. Plenty of these close normally. The list exists to tell you which one you have.

An illustration, so the shape is clear

Numbers and details below are made up to show the mechanism, not a quote or a result.

Two buyers each go under contract on a house with a garage converted to a bedroom and bath, neither one permitted.

The first requests the permit record the day of the showing, learns the town issues its own permits and has an online lookup, and confirms in an afternoon that the garage conversion was never inspected. The insurance agent quotes the address with the conversion disclosed and writes it without comment. The appraiser counts the converted space, supports it with two nearby sales of similarly converted homes, and the value lands where the contract price is. The file closes like any other purchase. The missing permit never becomes anything.

The second waits, requests from the county, learns it is not the issuing office, and requests again from the town, which publishes a thirty-day response time. Meanwhile the appraisal measures 400 fewer square feet than the listing and lands short of the contract price, and the first carrier declines the address until the added bath is documented. None of that is unfixable. But the extension, the re-negotiation and the second carrier all have to happen inside a deadline that is now nine days out.

Same house, twice. The difference was entirely the order the questions were asked in.

What to do now

Four things, and the first three cost nothing but a phone call.

Find out who issues permits for that address, and whether there is an online lookup or a records request with a published response time. Do this before you write the offer if you can, and on day one of the contract if you cannot.

Get an address-specific insurance quote with the work described plainly.

Ask your closing attorney whether the jurisdiction records code-enforcement actions, and whether anything is open on the address.

Then price the house you are actually buying. Run your scenario with no credit pull, no account and nobody calling you, and put a realistic insurance figure into it. If you are buying in a state where I am licensed, the South Carolina purchase pages carry the local closing detail, and the rest of the file — income, credit, the ratio — runs the same process as any other purchase.

Nothing here is a loan approval, a denial, or a commitment to lend, and none of it is legal, insurance or construction advice. Program property standards, local permitting rules and carrier requirements differ by place and change over time, and any specific property is worth confirming rather than assuming.

Common questions

Will a lender deny a mortgage because of unpermitted work?

Not for the missing permit by itself. Loan programs require a property to be safe, sound and structurally secure and to have eligible zoning compliance, and unpermitted work reaches the file through those requirements rather than through a permit rule. Freddie Mac's Section 5601.2 even allows an accessory dwelling unit that does not comply with zoning on a one-unit property, provided the appraisal contains two comparable sales with a similarly non-compliant unit and the seller confirms the unit will not jeopardize future hazard insurance claims.

Does unpermitted square footage count in the appraisal?

Sometimes, and that decision belongs to the appraiser rather than the listing. Space that was never inspected, is below grade, or is reached only through another room may be reported separately from the living area, and it needs comparable sales in that market to support a value. When similar converted homes have been selling nearby there is usually evidence. When nothing comparable has traded, the appraiser has less to work with.

Should I ask the seller to get a retroactive permit before closing?

It is one of the options, and it is worth asking what it would take before assuming it is simple. Retroactive permitting typically means opening walls for inspection, bringing the work to current code, and paying fees, and the timeline is set by the local department rather than by your contract. It also only answers the inspection question. If the use itself is not allowed under local zoning, a permit does not resolve that.

How do I find out whether work on a house was permitted?

Ask the local building department that has jurisdiction over that address, which is the municipality inside city or town limits and the county outside them. Some publish an online permit lookup. Others release building permit files only through a public records request. Beaufort County, South Carolina, for example, publishes that permit files come through a Freedom of Information Act request, with records under 24 months old made available within 30 calendar days and older records within 35.

Does unpermitted work affect homeowners insurance?

It can, which is why the quote should come early and should describe the work honestly. A carrier is being asked to cover space with no inspection record behind it, and carriers differ: some write it without comment, some want documentation, and some take a position on the addition specifically. Since coverage has to be in place at closing, a carrier declining the address stops the purchase even though no lender rule was involved.

Can I just not mention the unpermitted work?

It is not a strategy that holds. The appraiser measures the house independently and reports what is there, so the added space surfaces in the file whether or not anyone raised it. And a policy written on a description that left out the addition moves the problem into the future rather than avoiding it.