How to Get a Permit After Work Is Done
It happens more often than people admit: a deck goes up, a basement gets finished, or a bathroom gets gutted, and nobody pulled a permit. Whether you inherited the work from a previous owner or did it yourself, the fix is the same. Cities have a process for this, called an after-the-fact or retroactive permit, and going through it voluntarily is far cheaper than getting caught.
To permit work after the fact: stop any ongoing work, contact your local permit office before they contact you, apply for a retroactive permit with plans showing what was built, pay an investigation fee (often double the normal fee), and open finished walls so inspectors can verify rough-in plumbing and electrical. Fines apply in some cities, and work that cannot meet code may need to be redone.
Step 1: Stop work and assess
If work is still in progress, stop it. Continuing after you know a permit is required is what turns a fixable mistake into a willful violation, and most fine schedules treat the two very differently. Take stock of what was done: which walls were opened, which plumbing or electrical was touched, and whether anything structural changed. Take photos of everything before you cover or repair anything, because the permit office will want to see the current state.
Step 2: Call the permit office before they call you
This is the most important step. Voluntarily coming forward almost always produces a better outcome than getting caught by a complaint or an inspector's drive-by. Tell the office what was done and ask about the after-the-fact process. Many offices deal with this routinely and will walk you through it. Ask specifically about the investigation fee, whether you need an architect or engineer to document existing conditions, and which inspections will be required.
Step 3: Apply with plans of what was built
An after-the-fact permit application looks like a normal permit application, except the plans document what already exists instead of what you propose to build. You may need to hire a contractor, architect, or engineer to draw as-built plans, especially for structural or electrical work. The office reviews the plans against the current code, not the code from when the work was done, which surprises people: work that was fine ten years ago may not pass today.
Step 4: Expect the investigation fee and possible fines
Almost every city charges an investigation fee for after-the-fact permits, commonly equal to the normal permit fee, effectively doubling the cost. Cincinnati's schedule sets the investigation fee equal to the regular permit fee as a standard example. Some cities add fines on top: Washington DC fines up to $2,000 per infraction for work without a permit. Voluntary disclosure usually keeps you at the investigation fee; getting caught after a complaint is what brings fines and stop-work orders.
Step 5: Open the walls for inspection
This is the part people dread. The inspector cannot sign off on plumbing and electrical they cannot see, so finished drywall often has to come off in sections to expose the rough-in work. Plan for the cost of opening and re-closing walls. If the work behind the walls is good, this is an annoyance. If it is not, the inspector issues corrections and you fix them like any permitted project. Work that cannot be brought to code may have to be removed entirely.
Buying or selling a home with unpermitted work
Unpermitted work surfaces during sales. Appraisers may not count unpermitted square footage, which can lower the appraised value. Buyers' inspectors flag it. Title and insurance companies sometimes ask. Sellers generally must disclose known unpermitted work, and in many markets the seller either permits it retroactively or credits the buyer for the cost. If you are buying, ask for the permit history from the city before closing; it is usually public record and takes one phone call.
How to avoid this next time
The pattern is almost always the same: a contractor says "we don't need a permit for this," or a homeowner assumes cosmetic rules apply to structural work. Verify the claim with the permit office yourself; it takes five minutes and the office answers this question daily. Get the permit before work starts, schedule the rough-in inspection before walls close, and keep the final inspection card with your house records.
This is general information about common after-the-fact processes, not legal advice. Enforcement varies widely by city, so talk to your local permit office about your specific situation.
Find your local permit office
The after-the-fact process is set by your city's office, so start with the official source. Our free lookup shows the permit office for 48 US metros and each office's published rules.
After-the-fact permit questions
Can you get a building permit after the work is already done?
Yes. Most cities have an after-the-fact or retroactive permit process for exactly this situation. You apply with as-built plans showing what was constructed, pay an investigation fee (often double the normal fee), and pass inspections, which usually means opening finished walls to expose plumbing and electrical rough-in.
What is the penalty for building without a permit?
Penalties vary by city but typically include an investigation fee equal to the permit fee, effectively doubling the cost. Some cities add fines: Washington DC fines up to $2,000 per infraction. Getting caught after a neighbor complaint usually costs more than voluntarily coming forward.
Do I have to tear down unpermitted work?
Not automatically. If the work can be brought up to current code, you permit it retroactively, make any required corrections, and keep it. Work that cannot meet code, such as a structure violating setbacks or an unsafe electrical installation, may have to be removed or redone.
Will unpermitted work affect selling my house?
Yes, it often does. Appraisers may exclude unpermitted square footage, buyers ask for credits or for the work to be permitted before closing, and sellers usually must disclose known unpermitted work. Permitting the work retroactively before listing is generally the cleanest path.
How does the city find out about unpermitted work?
Most often through neighbor complaints, visible exterior work spotted by inspectors, or the permit history check during a home sale or refinance. Some cities also cross-reference contractor registrations and dumpster permits. Exterior projects like decks and additions are the most likely to be noticed.