A finished basement nobody pulled a permit for. A deck the previous owner built over a long weekend. A kitchen remodel where the contractor got the permit but never called for the final inspection. None of it matters much while you live in the house. It matters a lot when you try to sell it, because a sale is the one moment when buyers, inspectors, lenders, and often the municipality itself all take a close look at the property at the same time.
The good news is that most of these problems can be fixed, and almost none of them make a house unsellable. What they do is cost time, and time is the one thing a seller under contract doesn't have.
Unpermitted work and open permits are different problems
Unpermitted work is work that needed a building permit or zoning permit and never got one. As far as the municipality's records are concerned, it doesn't exist, and nobody ever inspected it.
An open permit is the opposite situation. The permit was issued and is on file, but the work was never signed off. Maybe the final inspection was never scheduled, maybe the contractor walked off the job, maybe the homeowner just forgot. Under Pennsylvania's Uniform Construction Code, a residential permit becomes invalid if work doesn't start within 180 days of issuance or stops for 180 days after it starts, and no permit lasts more than five years. So an old open permit usually isn't a live permit anymore. It's a record that says work was approved and never confirmed finished.
Open permits are usually the easier of the two to resolve, because the paperwork already exists and the work was planned to code. Unpermitted work can be simple or complicated depending on what it is and whether it can be inspected without tearing it apart.
How it comes up during a sale
Sellers sometimes assume that if nobody noticed the work for years, nobody will notice now. In practice there are several ways it surfaces.
The seller disclosure form is the first. Pennsylvania's Seller's Property Disclosure Statement asks about additions, structural changes, and other alterations, and whether the permits and approvals for them were obtained. It also asks about notices of code violations. A seller who knows about unpermitted work is expected to disclose it, and "I didn't know it needed a permit" doesn't erase what you do know about the work itself.
The buyer's home inspector is the second. Inspectors don't pull permit records as a rule, but they recognize amateur wiring, a bathroom vented into the attic, or a basement bedroom with no way out in a fire. Their report goes to the buyer, and the buyer's agent will often ask whether permits were pulled for anything that looks recent or homemade.
The municipality is the third. Many Delaware County towns require a resale Use and Occupancy inspection before a house changes hands, and some of them compare what the inspector sees against the permit history. A finished basement, a new bathroom, or an extra unit that isn't on file tends to get flagged right there.
Appraisers and lenders round it out. An appraiser may give little or no value to space that was added without approval, and some loan programs look harder at additions and conversions. Notice what's not on this list: the title search. Permit records are kept at the municipal building, not recorded with the deed, so a clean title report says nothing about open or missing permits.
Find out what's on file before you list
The simplest way to avoid a surprise is to look first. Call or visit your municipality's building or code enforcement office and ask for the permit history on the property, including any permits that were never finaled and any open violation notices. Some offices will tell you over the phone or by email. Others want a written request, and Pennsylvania's Right-to-Know Law gives you a formal way to ask for those records if it comes to that.
Compare what's on file with what's actually in the house. If the basement is finished, the porch is enclosed, or there's a half bath under the stairs that wasn't there when you bought the place, and there's no permit for it, you've found your list. Keep in mind that the Uniform Construction Code took effect statewide in 2004. Work done before then was governed by whatever local code the municipality had at the time, and some towns had none for certain work, so an older project with no permit isn't automatically a violation. The code office can tell you how they treat work from before 2004.
Closing out an open permit
For an open permit, start by asking the code office what it would take to close it. Often the answer is a final inspection. If the original permit has expired, you may need to apply again or pay a fee to reactivate it, and the inspector will want to see the work as it stands now. If a licensed contractor pulled the permit, call them first. They may be able to schedule the final under their own permit, and if the work was theirs to finish, it's on them to finish it.
Where the work was never completed, the choice is to finish it under a permit or to have the permit closed out as abandoned, which some offices allow when the work stopped short of anything that needs inspecting. Ask; offices handle this differently.
Legalizing unpermitted work after the fact
Getting a permit for work that's already done is usually called a retroactive or after-the-fact permit, and most Delaware County offices will process one. Expect the same application you would have filed up front, plus a few extra steps.
The inspector has to be able to see what they're signing off on. For a deck or a shed, that's easy. For a finished basement or a bathroom, it can mean opening sections of drywall so the inspector can look at framing, wiring, plumbing, and insulation, then patching and repainting afterward. Some offices will accept a report from an engineer or a licensed electrician instead of opening everything up, especially for structural or electrical work. The FAQ on electrical, plumbing, and HVAC permits covers how those trades are handled in this area.
Fees are often higher than they would have been. Many municipal fee schedules add a penalty for work started without a permit, sometimes as much as double the normal fee. And if the work doesn't meet code, it has to be brought up to code before the permit can close. A basement bedroom without a proper egress window is the classic example: either an egress window gets cut in, or the room gets described as something other than a bedroom.
Zoning is the part people forget. An addition, deck, or shed that's too close to the property line or that pushes the lot over its coverage limit can't be fixed with a building permit alone. That takes a variance from the zoning hearing board, which means an application, notice to neighbors, and a hearing that can take a couple of months to schedule. The same goes for a house converted to more units than its zoning allows. If zoning is the issue, find out early, because it's the slowest piece of the process by a wide margin.
Occasionally the answer is to remove the work. A shed in the setback or an illegal basement kitchen is sometimes cheaper to take out than to legalize.
The options for a seller
Once you know what you're dealing with, there are really four paths.
Fix it before you list. Close out open permits, legalize what can be legalized, and go to market with clean records. This takes the most time up front and gives buyers the least to negotiate over.
Disclose it and price it in. Some buyers, especially those planning their own renovation, will take a house with unpermitted work if they know about it going in and the price reflects it.
Negotiate it during the sale. If the issue comes up after a buyer's inspection or the municipal U&O, buyer and seller can agree on a repair, a credit, or a holdback at settlement. How the municipality treats the items it finds, including the temporary certificates state law allows when a resale inspection turns up violations, is covered in the U&O guide. This works, but it compresses the timeline and gives the buyer leverage.
Sell as-is. That doesn't remove the duty to disclose what you know, and it doesn't stop the municipality's resale inspection where one is required. It mostly tells buyers not to expect repairs.
Whichever path makes sense, the earlier you start, the more of them you have. A real estate agent who knows the local code offices can help you sort out which issues matter to buyers in your town.
If you're the buyer
Ask the seller's agent for the permit history on anything that looks recent or homemade, and call the code office yourself before your inspection contingency runs out. Once you own the house, the unpermitted work is yours, and so is the cost of legalizing it if the municipality ever comes asking.
More
Find your municipality's permit and zoning contacts. See also the permit FAQ, the glossary, and Use and Occupancy (U&O) Certificates in Delaware County, PA: What Sellers Need to Know.