Is Unpermitted Work a Dealbreaker When Buying or Selling a Phoenix Home?

I had a listing years ago where a previous owner had converted the garage into extra living space. It looked great. Flooring matched the rest of the house, it had air conditioning, it felt like a real room. But there was no permit on file for it. When the buyer's appraisal came back, that square footage simply was not counted toward the home's value. Appraisals are subjective in a lot of ways, but this part is not really up for debate. If a lender's guidelines say unpermitted space does not count, the appraiser leaves it out, no matter how nicely it was done.

That is the part people are usually surprised by, and it is not just a historic home issue. I sell both historic and non-historic properties across the Valley, and unpermitted work shows up everywhere: garage and room conversions, additions, pools and spas, patio covers, casitas, even electrical panel upgrades. Arizona law lets a homeowner do work on their own house without a contractor's license, which is exactly why this comes up so often. Doing the work yourself is legal. Skipping the permit is where the trouble starts. My recommendation is always to have any work done by a licensed contractor, and to check that contractor's ROC number with the Arizona Registrar of Contractors before you hire them.

On the seller side, Arizona's Seller's Property Disclosure Statement requires you to say whether work was done on the home and whether it was permitted. That is not optional, and it is not just paperwork. A seller who leaves it off and gets found out later can be on the hook for real liability, including the buyer's repair costs and the drop in value. If you have done work on your home, even work you are proud of, it needs to be on that form.

For my sellers, I like to have a pre-inspection done before the home ever hits the market. It gives us a better look at any unknowns or possible roadblocks, including things like unpermitted work, ahead of time, rather than finding out about them from the buyer's inspector once you are already under contract. It is much easier to deal with a surprise on your own terms than in the middle of someone else's timeline.

On the buyer side, you are not stuck guessing. The City of Phoenix's SHAPE PHX portal is the current system for permit history, and older records before 2022 are archived in PDD Online. You can search a property by address and see what permits were pulled, whether they were finaled, and whether anything was left open. The red flags I tell my buyers to watch for are a finished garage or room with no matching permit, a pool with no pool permit, or an extra bathroom with no plumbing permit on file. It takes a few minutes to check and it can save you a very expensive surprise.

I also tell my buyers to pull up a home's old MLS listing photos if they are available, going back as many years as you can find. A home is often listed for sale more than once over the years, and comparing those old photos to what the house looks like today can reveal changes nobody mentioned. I was on the buyer's side of a transaction where we did exactly that and found a loft had been built over what used to be open space, something that only came out during the inspection because it had never been disclosed. If it had not surfaced then, that buyer could have closed without ever knowing part of the home was altered without a permit and without a word to anyone.

Here is where it really bites financially. Lenders frequently instruct appraisers to leave unpermitted square footage out of what is called the gross living area, the number the appraisal is actually based on, and that holds true regardless of how well the work was done. That means a home that shows as 2,200 square feet online might only appraise as 1,900 if part of it was never permitted. Since your loan amount is based on the appraised value and not the listed square footage, that gap can change what a buyer qualifies for or force a renegotiation right in the middle of escrow.

Here is the part worth knowing ahead of time. Not every lender treats unpermitted work the same way. Some, including certain conventional financing options, will still lend on a home with unpermitted work depending on their own guidelines and how they view the situation. Others will not touch it at all. The lenders willing to work with it are not always the first ones a buyer talks to, so if you already know or suspect a home has unpermitted work, it is worth finding out ahead of time which lenders can actually handle it, rather than discovering the hard way partway through escrow.

If the home is in one of Phoenix's historic districts, there is one more layer. Any exterior work there needs approval from the city's Historic Preservation Office before a building permit is even issued, and that approval comes in one of two forms. A Certificate of No Effect covers minor work that clearly will not change the historic character of the property, things like a small addition, an outbuilding, or a rear patio cover that is not visible from the street, and it is usually approved over the counter by city staff the same day. A Certificate of Appropriateness is for anything bigger or more visible from the street, larger additions or significant exterior changes, and it requires a public hearing in front of an independent hearing officer to confirm the project fits the city's design guidelines for that district. Skip either one and do the exterior work anyway, and it can trigger a stop-work order. That protection exists because a historic district's designation depends on the neighborhood keeping its character intact, so the city takes it seriously.

There is another layer specific to older homes worth understanding. Building codes change over time, and a historic home may have gone through decades of owners, each one making their own changes and updates along the way. That means there can be alterations to the property that happened long before you ever saw the listing, some permitted, some not, and simply not something you would know to ask about. This is exactly why it matters to work with a home inspector who is actually skilled and experienced with historic homes. They know what to look for in an older property in a way a general inspector may not, and that experience can catch things a standard inspection would miss. On the appraisal side, you cannot simply choose your own appraiser for lending purposes, that assignment comes from the lender. What you can do is ask your lender to make sure the appraiser they select has real experience appraising older, historic homes, since that background makes a real difference in how fairly a home like this gets valued.

I need to disclose here that I am not a licensed contractor, an inspector, or an attorney, and I am not going to pretend to be one. What I am is the person who has been through this on an actual transaction and knows what it means and who to call. When unpermitted work shows up on a home I am selling or one my buyer wants to purchase, my job is to catch it early, get the real permit history pulled, and loop in the right professional, whether that is the city's permit office, a licensed contractor for a retroactive permit, or an attorney if the situation calls for it. Most of the time it does not end the deal. It just means adjusting the price, getting it permitted, or going in with your eyes open instead of finding out at the closing table.

Whether you are buying a 1920s bungalow or a home built last decade, the question is the same: was the work done the right way, and does everyone involved know about it. That is something I try to make sure of.

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