Unpermitted construction is more common than most homeowners realize — and more consequential. A structure built without a required building permit creates a legal and financial exposure that tends to surface at the worst possible moment: when you're trying to sell your home or refinance. This guide explains what unpermitted work means, when it becomes a problem, and how to resolve it.
What Is Unpermitted Work?
Unpermitted work is any construction that required a building permit but was done without obtaining one. Common examples include:
- A shed built larger than the county's permit-exempt threshold
- A deck added to the house without a permit
- A room addition, garage conversion, or finished basement done without permits
- Electrical, plumbing, or HVAC work done without trade permits
- A fence installed without a required building or zoning permit
- A swimming pool installed without permits
How Unpermitted Work Is Discovered
Unpermitted structures are typically discovered in three ways:
- Home sale: A buyer's home inspector notes the structure. The buyer's lender or attorney flags it during the title process. The county's permit records don't show a permit for the structure. This is the most common discovery scenario.
- Neighbor complaint: A neighbor complains to the county about a structure being built. A code enforcement officer visits and finds no permit on file.
- Insurance claim: After storm damage or a fire, an insurance adjuster discovers the structure was unpermitted. The insurer may deny the claim.
Consequences of Unpermitted Construction
At Home Sale
This is where unpermitted work causes the most disruption. When you list your home, you're legally required in most states to disclose known unpermitted construction. Even if you don't disclose it, a home inspector will typically flag visible unpermitted structures. Consequences at sale can include:
- Buyer requests a price reduction equal to the cost of permitting and any required remediation
- Buyer's lender refuses to close until the permit issue is resolved
- Closing delayed while you obtain retroactive permits
- Structure must be removed if it can't pass current code inspection (expensive)
From Code Enforcement
If the county discovers unpermitted construction through a complaint or inspection, they may:
- Issue a stop-work order (if construction is still in progress)
- Issue a notice of violation requiring you to either permit the work retroactively or remove the structure
- Assess fines — typically ranging from $100 to $1,000+ per violation per day in severe cases
How Retroactive Permits Work
A retroactive permit (sometimes called an "after-the-fact" permit) is the same as a normal permit, applied after the work is already done. The process:
- Application: Submit a permit application as if applying for new construction, plus a description of what was already built.
- Fee: Retroactive permits typically cost 2–3× the normal permit fee as a penalty for not applying before construction.
- Inspection: An inspector visits to verify the structure meets current building code. This may require exposing walls, framing, or electrical work if the inspector can't verify code compliance visually.
- If it passes: The permit is issued and recorded in the county's system. The problem is resolved.
- If it fails: The structure must be modified to meet current code. In some cases, this means significant remediation work. In rare cases, structures that fundamentally violate code or setback rules must be removed.
What If the Structure Violates Setback Rules?
This is the most difficult scenario. If a shed, deck, or addition was placed in violation of setback requirements — too close to the property line or in the front yard — no amount of retroactive permitting fixes the zoning violation. Options:
- Apply for a variance: Ask the zoning board to grant a variance from the setback requirement. Variances are granted based on hardship and typically require neighbor notification and a public hearing. Not guaranteed.
- Relocate the structure: If it's moveable (like a shed), move it to a compliant location.
- Remove it: Last resort — demolition and removal of the structure.
Selling a Home With Unpermitted Work
If you know you have unpermitted structures and want to sell, you have three options:
- Proactively permit before listing: Resolve the issue before it becomes a negotiation point. Cleanest outcome.
- Disclose and price accordingly: In most states you're required to disclose known unpermitted work. A disclosed, priced-in issue is less disruptive than one discovered mid-transaction.
- Sell as-is: Some buyers will accept unpermitted structures, especially investors. Expect a price concession.
Frequently Asked Questions
- Retroactive permits typically cost 2–3× the normal permit fee, plus any additional inspection fees. If the structure requires modifications to pass inspection, add the cost of that remediation work. In total, a retroactive shed permit might cost $150–$400. A retroactive deck permit might cost $300–$800. A retroactive room addition can cost significantly more if remediation is required.
- Not always — but the risk is significant. Home inspectors are trained to identify structures that appear to lack permits (improper materials, non-code construction details, no permit sticker). Buyers' lenders commonly require verification of permits for additions that affect the appraised square footage. And most states require sellers to disclose known unpermitted work. The risk is real enough that proactively permitting before sale is almost always worth it.
- Yes — unpermitted decks are disclosed and sold regularly. The issue comes when the buyer's inspector flags it or the buyer's lender requires it to be addressed. Options: permit the deck before listing, disclose it and offer a price credit, or remove it. If you disclose the unpermitted deck upfront and price it into the sale, it's much less disruptive than having it discovered mid-transaction.
- In most US states, yes. Seller disclosure laws require you to disclose known material defects that could affect the value of the property. Unpermitted construction is generally considered a material fact that must be disclosed. Failing to disclose known unpermitted work can expose you to legal liability after the sale. Consult a real estate attorney in your state for specific advice.