Unpermitted work does not automatically kill a refinance, but it can shrink the value your loan is based on, and that is where the plan breaks. Freddie Mac put the 30-year average at 7.03% for the week of September 24. Add a converted garage or a casita with no permit history to a Scottsdale or Phoenix refinance and the appraiser may leave that space out of the number entirely. Here is how the appraisal treats it, what the math looks like, and the four ways owners get through it.

How unpermitted work shows up on a refinance

The appraiser is the first person who will notice. They measure the house, look at public records, and compare the two. When an extra room, a garage conversion, or a guest house does not match what the county has on file, they note it. The loan underwriter then reads that note and decides what to do with it.

The lender does not need to be hunting for it. The mismatch shows itself. Maricopa County sits at the center of a lot of this, since decades of Valley homes have had patios enclosed, garages finished, and casitas added by owners and previous owners without paperwork. If you bought the house that way, you may not even know.

Under the CFPB's appraisal guidance, your lender must send you a copy of the appraisal. Read it. The notes on additions and living area will tell you exactly how the appraiser handled your space before the underwriter does anything with it.

What it does to your loan to value

The unpermitted space may be excluded from the value, and your loan to value then jumps. The table uses an example home appraised at $520,000 with an $87,500 converted garage, which is 350 square feet at $250 a square foot. These are illustrative numbers to show the pattern.

The house did not lose value overnight. The part of it the lender is willing to count did. A rate and term refinance that looked easy at 77% LTV becomes difficult at 92%. A cash out refinance that needed 75% or lower is gone. That is the real cost of unpermitted work, and it is why the same house can qualify one month and fail the next once an appraiser looks.

The risk is not that the lender finds out. It is that the appraisal stops counting the space you paid for.

This is different from the usual low value problem. In our post on when a refinance appraisal comes in low, the issue is market comparables. Here the issue is legality and records. Better comps will not fix it. A permit might.

What to do before you order the appraisal

Do the homework first, because an appraisal is a cost you pay whether or not the loan closes. Start with your city or county permit records and see what is actually on file for the address. If you bought the home recently, pull your inspection report and the seller's disclosure, since either one may mention work the previous owner did.

Then measure. Compare the square footage on the county record with the square footage you are living in. A gap of a few hundred feet is the signal. Finally, tell your loan officer up front. Surprises in week three cost you a rate lock extension and weeks of stress. Telling me on day one lets us choose the structure before the appraiser walks through the door, and sometimes that means we skip the refinance entirely and wait until the permit is closed.

Run your own numbers

Four ways owners handle it

You have four real options, and each trades time, money, or value.

• Legalize the work. Apply for a permit after the fact. Maricopa County's policy on structures built without a permit says applicants may need plans, inspection reports, and sometimes must open finished walls so inspectors can see the work. A doubled fee applies if there is an open code violation. This covers unincorporated areas, and cities like Scottsdale and Phoenix run their own departments.
• Refinance without counting it. If the numbers still work with the space excluded, close the loan on the lower value and deal with permits later. This is the cheapest path when your equity is thick.
• Undo it. Return the space to its permitted use. This is rare but sometimes smart for a small enclosure that adds little value.
• Use a more flexible lender. Non-QM and portfolio lenders can treat property condition differently, usually at a higher rate. Our guide to non-QM refinancing in Arizona explains when that is worth paying for.

Be honest about the permit route. Opening a wall to prove the wiring behind it can cost thousands, and it can surface problems you then have to fix. Get a contractor's quote before you assume it is cheap. If you intend to keep the space and rent it or sell later, the permit usually pays for itself. If you plan to refinance once and move in a couple of years, the excluded route may win.

One more point on timing. If the permit is already in process, tell your lender and ask whether a closed permit changes the appraisal. Often it does, because a finalized inspection gives the appraiser a record to cite. A refinance on hold for six weeks while a permit closes is annoying, but it usually costs less than closing at the lower value and living with it.

Casitas, garages, and the Arizona special case

Arizona homes collect these changes more than most. Garage conversions, enclosed patios, and detached casitas show up in Valley neighborhoods constantly. A guest house with a bathroom and kitchenette is the most common issue I see. If you are weighing one, read our guide to casita and ADU financing in Arizona before you spend anything, because permitted and unpermitted space get treated very differently on a loan.

If your appraisal is already in and the number looks wrong, compare it with how the appraisal drives a refinance. The sequence of what to ask, in what order, matters.

What this means for Phoenix homeowners

Check your permit history before you apply. The Homes.com Phoenix housing market report shows how prices have moved, which tells you how much cushion you have if the space is excluded. If you are also thinking about moving up, the Arizona Luxury Property Search shows what Scottsdale and Valley homes are listed for now. See our loan programs and how our process works for what happens after you apply.

Want to know if your refinance still works? Start at pillarmortgagegroup.com, book a call, or fill in the form below. I will run it with you.

Frequently asked questions