What to Look for When Buying a Home With an Existing ADU in Florida

The listing photos and remarks won’t tell you whether the ADU is legal. They won’t tell you whether your lender will count it. They won’t tell you whether your insurance carrier will write the policy. You have to verify these things yourself — or work with someone who knows what to verify.

Is the ADU actually permitted?

This is the single most important question to answer before you make an offer. It is also the question most buyers — and many agents — never ask.

A permitted ADU appears in county building department records. It was inspected during construction, conforms to building codes, and is legally recognized as a secondary dwelling unit. An unpermitted ADU is functionally invisible to the county — even if it has a kitchen, a bathroom, a separate entrance, and a roof. From an appraiser’s, lender’s, and insurance carrier’s perspective, the structure technically doesn’t exist.

In Florida specifically, this is more common than buyers expect. Decades of homeowners have added guest cottages, converted garages, expanded outbuildings, or finished detached structures without pulling permits. Sometimes the work was done before the current owner bought the property. Sometimes it was done last year. Either way, the structure exists physically but doesn’t exist legally.

How to verify: Contact the county building department or look up permit records online. Most Florida counties have searchable permit databases. Search by the property address and look for permits referencing the ADU, guest house, accessory structure, or whatever the listing calls it. If you don’t find one, that’s your answer.

If the ADU is unpermitted, you have three options: walk away, negotiate a price reduction reflecting the diminished value, or pursue legalization after closing (which varies in difficulty by county). What you should not do is assume the unpermitted unit will just be fine.

Does the ADU have a true full kitchen?

The presence or absence of a real kitchen is what separates a legal accessory dwelling unit from a bonus room with marketing language attached.

A true full kitchen includes: a full-size stove or range, a full-size refrigerator, a sink with proper plumbing, and adequate cabinetry and storage. The space is designed and built to function as a primary cooking area for a household.

A kitchenette is something different: a microwave, a mini-fridge, maybe a hot plate, and a small sink. It’s adequate for a guest staying for a weekend. It may or may not be adequate for a family member living there long-term, and it is not what appraisers and lenders look for when valuing a property as having an ADU.

This matters because the listing will not always be honest about which one you’re looking at. We’ve toured Florida properties marketed as having an “in-law suite with full kitchen” where the kitchen turned out to be a microwave, a bar fridge, and a coffee maker on a counter. We’ve also seen properties dismissed as “guest suites” that have proper full kitchens an appraiser would recognize.

When you tour the property, walk into the ADU kitchen and ask: could a person genuinely cook every meal here? If the answer is no, it’s a kitchenette regardless of what the listing says.

Does the ADU offer real independence?

A true ADU functions as its own dwelling. The more it operates independently from the main house, the more value it adds and the better it serves whoever lives there.

The most independent ADUs feel like their own small home that happens to share a property with the main residence. The least independent feel like a bedroom with a kitchenette down a hallway. Both can be legally classified as ADUs, but they function very differently in daily life — and they value very differently at appraisal.

Does the HOA allow what’s already built?

Florida’s statewide ADU bill (HB 1389) passed both chambers of the Legislature in March 2026 and is currently awaiting action by Governor DeSantis. As of today, it has not been signed into law. Even once it is signed, the bill would not override HOA covenants — it only limits what cities and counties can restrict. If the property you’re considering is in a deed-restricted community, the HOA’s rules still apply, and those rules vary significantly.

Regardless of where the state law lands, if the ADU is already physically built and was permitted by the county, you need to verify it complies with the HOA’s current covenants. Several scenarios are common:

Scenario one: The ADU predates current HOA rules and was grandfathered in. This is generally fine but can become complicated at resale if rules change again.

Scenario two: The ADU complies with current HOA rules. The cleanest situation.

Scenario three: The ADU was built without HOA approval and violates current covenants. The current owner may face fines or demolition orders. As a new owner, you inherit the problem.

Scenario four: The ADU is fine to keep but the HOA prohibits renting it. If your plan was to use it for rental income, that plan is dead before you close.

Request the HOA’s covenants, conditions, and restrictions document in writing. Read the sections on accessory structures, secondary residences, short-term rentals, and long-term rentals. Don’t take a real estate agent’s word for it — get the document. For a deeper look at how Florida’s statewide ADU law interacts with HOA rules, our full guide to Florida ADU laws covers the details.

Will your lender finance it? Will your insurance cover it?

Two professional opinions matter as much as the listing itself when buying a home with an ADU. Neither one is included in the listing photos.

Your lender’s view of the property matters early. Permitted ADUs are typically straightforward — most conventional loans and FHA loans will count the ADU as part of the property’s living space and may allow rental income to be used for qualifying. Unpermitted ADUs are different. Many lenders will not finance properties where significant unpermitted construction exists. Others will finance the property but require the unpermitted portion to be excluded from the appraisal, which lowers your loan-to-value ratio.

Before you commit, ask your loan officer specifically: “If the appraiser identifies the ADU as unpermitted, how does that affect my loan?” The answer varies by loan type, lender, and state.

Your insurance carrier will have questions too. Florida’s insurance market has tightened considerably over the past few years. Standard homeowners policies may not adequately cover a detached ADU, especially one used as a rental. Some carriers won’t write a policy on a property with multiple residential structures. Others will write the policy but exclude the ADU.

If you plan to rent the ADU short-term or long-term, you may need a landlord policy on top of the homeowners policy. This is a separate cost most buyers underestimate.

Talk to your insurance agent before you make an offer, not after. The answer to “will you write a policy on this property” may change whether the property makes sense for you.

Will the ADU appraise at the value you’re paying for?

Appraisers value ADU-equipped homes differently than standard single-family homes. The methodology is well-established but the outcomes vary by region and by the specific ADU.

A properly permitted, full-kitchen, detached ADU in a neighborhood with comparable sales will typically appraise well — adding meaningful value to the overall property. A permitted ADU in a neighborhood where no comparable sales exist is harder to value, and the appraiser may discount it. An unpermitted ADU generally adds little or nothing to appraised value, regardless of how nice it is.

If the property’s listing price assumes the ADU adds substantial value but the appraisal doesn’t agree, you have a problem: your lender will only finance based on appraised value. The gap between purchase price and appraised value becomes your additional cash out of pocket — or grounds to renegotiate or walk away.

Our blog post on how much ADUs add to property value in Florida covers the appraisal framework in detail, including regional value patterns and what drives maximum valuation.

What to verify before making an offer

If you’re touring a Florida home with an existing ADU, these are the items we work through with our clients before recommending an offer:

A specialist agent verifies these items during the offer process — before commitment, not after.

Red flags worth taking seriously

Not every ADU-equipped property is worth buying. These are the situations where we tell our clients to keep looking.

The ADU is unpermitted and the seller can’t or won’t help legalize it. Some counties allow legalization of older unpermitted structures with a clear path. Others don’t. If the seller isn’t willing to help navigate this, you’re inheriting the problem.

The HOA prohibits the existing configuration. If the ADU was built without HOA approval and the HOA is actively enforcing the violation, you may inherit fines or demolition orders. This is rare but real.

No insurance carrier will write a policy. In Florida’s current insurance market, some properties become essentially uninsurable. If your insurance agent can’t find a carrier willing to write a policy that covers the ADU, that’s a fundamental problem.

The ADU shares septic capacity that isn’t adequate for two households. Florida rural acreage properties sometimes have septic systems sized for the original primary residence only. Adding additional occupants in an ADU can overwhelm the system, leading to expensive replacement costs.

The seller refuses to provide HOA documents, permit records, or insurance history. Reasonable sellers cooperate with reasonable buyer due diligence. Sellers who don’t usually have something they don’t want you to find.

Properties we’ve already curated

If you’re shopping for a Florida home with an existing ADU and you’d rather not sift through every listing yourself, we maintain a current list of Florida resale inventory — every property meets three criteria: a separate living quarters, a full second kitchen, and a price under $1 million.

We review every listing personally before adding it to the list to confirm it’s a true ADU and not just a marketing label. We flag which “multigenerational” listings are misleading, which have genuine full second kitchens versus a kitchenette, and which properties look worth a closer look. We do not verify permitting status, code compliance, or whether the ADU is legal under local zoning and HOA rules — that’s due diligence you’ll want to do on any specific property before making an offer.

See the current Florida ADU resale list →

Updated weekly. Free access. No pressure.

ADU due diligence requires a specialist

Most real estate agents have closed a handful of transactions involving ADUs — usually as a feature, not as the central reason for the purchase. We work in this category every day. That difference shows up in the questions we ask, the records we pull, and the problems we catch before they cost you money.

We verify permit status with the county before recommending an offer. Not after. Not at inspection. Before.

We coordinate the lender and insurance conversations early. Your loan officer and your insurance agent both need information about the ADU before they can give you a real answer. We help orchestrate those conversations so the answers come back before you commit.

We know what to look for during showings. The kitchen test, the entrance question, the utility configuration, the sound insulation reality. We notice these things because we’ve toured hundreds of Florida ADU properties.

Buying a home with an existing ADU is a great decision — when you know what you’re buying. We make sure you do.

Considering a Florida home with an existing ADU? Let’s walk through the property and the questions worth asking before you make an offer.

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