Unpermitted work: buying, selling and fixing it

Unpermitted work is common, and it is not usually a disaster. It becomes one when it is discovered late — during a buyer's inspection, an appraisal or an insurance claim — because that is when the person who needs it resolved has the least leverage and the least time.

How to find it before you buy

• Pull the permit history by parcel number and compare it against what the property physically contains. A finished basement, a converted garage, an added bathroom or a deck with no corresponding permit is the signal.
• Compare the county assessor's recorded square footage against the listing square footage. A gap frequently means unpermitted conditioned space.
• Look for work that is visibly newer than the house, particularly electrical panels, HVAC equipment, and bathrooms in unusual locations.
• Ask the seller directly and in writing. Disclosure requirements vary by state, but a written question creates a record either way.

What it actually costs the buyer

Three separate costs, and people usually only budget for the first. There is the retroactive permit fee with its penalty. There is the cost of exposing concealed work so it can be inspected — opening drywall, excavating to show a footing. And there is the cost of bringing the work up to current code, which may be a later and stricter edition than was in force when it was built.

The appraisal consequence is separate again: unpermitted square footage is commonly excluded from the valuation, so a finished basement that was never permitted may be adding nothing to what the property is worth on paper, and lenders may decline to count it.

Options for the seller

• Permit it retroactively before listing. Most expensive in the short term, cleanest outcome. It removes the issue from negotiation entirely.
• Disclose and price it in. Legitimate, and in many states required. Buyers discount for uncertainty, so expect the deduction to exceed the actual remediation cost.
• Remove the work. Sometimes the cheapest route for a small unpermitted structure.
• Do nothing and hope. This is how deals collapse a week before closing.

The retroactive permit process

It runs like a normal application with two differences. You declare that the work is already built, and you accept a penalty — commonly a doubling of the permit fee. The office then needs to inspect what it cannot see, which means either opening the work up or, in some jurisdictions, submitting an engineer's letter certifying it as built. Ask which the office accepts before you start demolition.

When the work cannot be permitted at all

Occasionally the answer is no: the structure sits in a setback, exceeds lot coverage, is in a floodplain, or the use is not permitted under current zoning. In those cases the options narrow to seeking a variance — slow, uncertain, and heard publicly — or removing the work. Establishing which situation you are in is the first thing to do, because it changes everything that follows.