What Happens If You Do Work Without a Permit?

Unpermitted work is any construction, alteration, or system installation done without a permit that the local code required. It is common, especially in older homes that have passed through several owners, and it ranges from a minor bathroom fan swap to an entire basement apartment. The consequences depend on what was done, whether it is safe, and whether it comes to light.

This guide covers how building departments handle unpermitted work, real examples of local penalties and fixes, and the usual path to legalize it. Local procedures vary, so confirm the details with the department that has jurisdiction.

What the building code allows the department to do

Most jurisdictions adopt the administrative chapter of the International Residential Code (IRC) or International Building Code, with amendments. Under Chapter 1 of the 2021 IRC (quoted here from Utah’s adoption on UpCodes):

• Permits are required up front. R105.1 requires the owner or owner’s authorized agent to apply for and obtain the permit before building, altering, or repairing a structure or installing or altering electrical, gas, mechanical, or plumbing systems.
• Added fee for starting early (R108.6). Anyone who starts work requiring a permit before obtaining it “shall be subject to a fee established by the applicable governing authority that shall be in addition to the required permit fees.” The model code does not set the amount; each jurisdiction does.
• Unlawful acts and notices of violation (R113.1, R113.2). Building or altering in violation of the code is unlawful, and the building official can serve a notice of violation ordering the work stopped and the violation abated.
• Prosecution and penalties (R113.3, R113.4). If the notice is ignored, the official can ask the jurisdiction’s lawyers to go to court to restrain, correct, or abate the violation or require removal of an unlawful occupancy. Penalties are “as prescribed by law,” meaning state and local law.
• Stop-work orders (R114). The official can issue a written stop-work order when work is contrary to the code or unsafe, and the cited work must stop immediately. Anyone who keeps working after the order faces fines set by the jurisdiction (R114.4).
• Utility disconnection (R111.3). The official can authorize disconnection of utility service in an emergency to eliminate an immediate hazard, or where a utility connection was made without the required approval.
• No concealment before approval (R109.4). Work that has not passed inspection “shall not be covered or concealed until authorized by the building official.” This is the basis for requiring drywall or finishes to be opened on unpermitted work.

How cities handle it

• Seattle, WA. The Seattle Department of Construction and Inspections says it may issue a stop-work order if you start a building, addition, or remodel without a permit, and may fine you or take other enforcement action if you build without a permit or fail to get a final inspection. Fines for building without a permit can reach $500 per day.
• Miami-Dade County, FL. The county’s electrical and plumbing/gas fee sheets state that applicants “will be charged a double fee for doing work without a permit,” with a minimum permit fee of $233.82 for each trade. For open or expired permits, the county says the owner is responsible: you may need to renew or extend the permit, or get a new one, and pass inspections. Permits issued before 1998 need an expired permit check inspection. If someone asks to cancel a permit and the work still exists, the county assesses an additional inspection fee, issues a notice of violation, and can follow up with a civil violation notice and fine.
• New York City, NY. Department of Buildings violations are heard at OATH. If a violation lists a cure date, you can correct the condition and submit a Certificate of Correction by that date to avoid any penalty. Some violations allow a stipulation that gives 75 days to correct the condition for a reduced penalty, usually half the standard amount. Failing to attend a hearing can bring default penalties of up to $25,000, depending on the summons, and a violation stays open in DOB records until proof of correction is accepted.
• Austin, TX. Austin Development Services lists the practical costs: some insurers will not cover claims for work done without permits, unpermitted work can affect your ability to refinance, borrow, or sell, and work that was not done correctly may have to be redone by someone else.

Practical risks for owners

• Safety. The main purpose of inspections is to catch hazards like undersized beams, improper wiring, missing fire separation, or unvented gas appliances before they are hidden.
• Insurance. Insurers may dispute claims tied to unpermitted work, particularly when that work caused the loss, and may decline to renew a policy once they learn of it.
• Sale and disclosure. Buyers, appraisers, and home inspectors often notice additions, conversions, or finished spaces that do not match public records. Texas’s Seller’s Disclosure Notice (TREC Form 55-1, effective May 28, 2026) asks directly whether the seller is aware of “room additions, structural modifications, or other alterations or repairs made without necessary permits or not in compliance with building codes in effect at that time.”
• Appraisal and financing. Appraisers may not count unpermitted living area in the home’s value, and some lenders will not finance a property with unresolved violations.
• Future permits. A department reviewing a new application may discover the earlier work and require it to be addressed first.
• Contractor recourse. If an unlicensed contractor did the work without a permit, your options for recovering costs from that contractor may be limited, depending on state law.

Common examples of unpermitted work

• Basement finishes and basement bedrooms without code-compliant egress
• Garage conversions into living space
• Decks attached to the house without a permit
• Electrical additions, panel replacements, and new circuits
• Water heater and furnace replacements
• Window enlargements and new openings in exterior walls
• Accessory dwelling units and rental units
• Removal of interior walls that turned out to be load-bearing

How to legalize unpermitted work

Departments call this an after-the-fact permit, a retroactive permit, an as-built permit, or a legalization permit. The general process:

1. Gather what you know. Dates, who did the work, receipts, photos taken during construction, and product information all help.
2. Talk to the department. Ask how it handles after-the-fact permits and what documentation it expects. You can find your local building department in our directory.
3. Prepare drawings of the existing work. For larger projects, as-built drawings showing framing, structure, and system layouts are usually required. Structural work may need an engineer’s evaluation.
4. Apply and pay fees, including any penalty or investigation fee.
5. Open up work for inspection as required. Inspectors may ask for drywall to be removed at key locations to see framing, wiring, plumbing, or insulation. Sometimes targeted openings are enough; sometimes more is needed.
6. Correct deficiencies identified in review or inspection.
7. Pass final inspection and keep the closed permit with your property records. If the work created new living space or a new unit, ask whether a certificate of occupancy is needed.

If the work cannot be brought into compliance, for example because a structure violates zoning setbacks, the options may be a variance, a modification, or removal. IRC R104.10 lets the building official grant a modification for an individual case where strict compliance is impractical, as long as it does not lessen health, life, fire safety, or structural requirements.

Legalization checklist

• Pull the property’s permit history and list every open, expired, or missing permit.
• Collect receipts, contractor names, product manuals, and any construction photos.
• Have as-built drawings prepared; get an engineer’s letter for structural changes.
• Ask the department which code edition applies and what the penalty fee will be.
• Budget for opening and patching walls, ceilings, or floors at inspection points.
• Line up licensed trades for any electrical, plumbing, or gas corrections.
• Schedule inspections in sequence and do not close up anything before approval.
• Keep the final approval and, if applicable, the certificate of occupancy with your records.

Code edition matters

Under IRC R102.7, the legal occupancy of a structure that existed when the code was adopted may continue, and under R102.7.1 new additions, alterations, or repairs must meet the requirements for new work. In practice, work being legalized is usually reviewed under the code currently in effect, though building officials have some discretion. Work that predates permit requirements altogether is a different situation; ask the department how it treats those cases.

When you are buying a house

• Compare the house to the permit history and assessor records. Extra bedrooms, baths, or square footage that do not appear in the records are a signal.
• Request the permit history from the building department or its online portal before your contingency deadlines, and look for open or expired permits as well as missing ones.
• Ask the seller directly and in writing about any work done without permits.
• Review the seller’s disclosure statement for any answers about permits, and ask follow-up questions about anything left blank.
• Have a qualified home inspector look closely at additions, conversions, and electrical panels.
• Discuss options with your agent or attorney, such as a price adjustment, seller-funded legalization, or a repair credit.

Questions to ask your building department

• How do you handle after-the-fact or as-built permits, and is there a checklist?
• What penalty or investigation fee applies, and how is it calculated?
• What will inspectors need to see, and how much will need to be opened up?
• Which code edition will apply to the existing work?
• If part of the work cannot be approved, what are the options?
• Do you have a voluntary compliance or amnesty program for older work?

If you plan to do future work yourself, see owner-builder permits. For how to approach a new permit correctly from the start, see How to apply for a building permit.