Florida's 2026 ADU law (HB 313, effective July 1, 2026) requires every county and municipality to allow accessory dwelling units (ADUs) in all single-family residential zones by December 1, 2026. For many Florida homeowners, this opens the door to rental income from a garage apartment, in-law suite, or detached cottage on the same lot.
But what happens if that homeowner falls behind on their mortgage? How does an ADU affect the Florida foreclosure process, loss mitigation options, and any tenants living in the accessory unit? This guide explains the key intersections between Florida's new ADU law and the foreclosure process.
An ADU Is Part of the Mortgaged Property
The most important fact for any homeowner to understand is that your existing mortgage covers the entire parcel, including any ADU you build or convert on the same lot. An ADU does not create a separate title or a new legal description. You own the ADU the same way you own any improvement on your property -- and your lender's security interest covers it all.
This means that a lis pendens and foreclosure complaint filed against your property covers both the main residence and the ADU as a single action. There is no way to shield the ADU from a first mortgage foreclosure.
HOA Restrictions Are Not Preempted by the 2026 ADU Law
Florida HB 313 requires local governments to allow ADUs, but it explicitly does not override private deed restrictions or HOA governing documents. If your HOA declaration prohibits accessory structures, garages converted to living space, or short-term rentals, those restrictions remain in effect regardless of what the municipality allows.
Before building or converting an ADU, check your HOA documents carefully. An unauthorized ADU in an HOA community can result in a violation fine, a lien on your property, and a mandatory removal order -- all of which add to your financial burden when you are already struggling. See our guide on HOA vs. mortgage foreclosure in Florida to understand how HOA liens interact with your first mortgage.
ADU Rental Income and Loss Mitigation
A permitted ADU generating documented rental income can actually help you qualify for a loan modification or forbearance. When you submit a loss mitigation application to your servicer, you document all household income -- including rental income from the ADU. Fannie Mae and Freddie Mac guidelines allow servicers to count verifiable rental income in your gross monthly income calculation, which improves your debt-to-income ratio.
To use ADU income in a modification application, you will need a signed lease agreement and bank statements or deposit records showing rent received consistently. Document the income carefully before submitting your hardship letter and modification packet to your servicer.
Tenant Rights in the ADU During Foreclosure
If your ADU is occupied by a tenant under a bona fide lease and your property goes through foreclosure, that tenant has federal protection under the Protecting Tenants at Foreclosure Act (PTFA), Pub. L. 111-22 (made permanent in 2018). This law requires the new owner after the foreclosure sale -- whether a third-party investor or the bank -- to either honor the existing lease through its end date or provide at least 90 days written notice to vacate, whichever is longer.
A “bona fide” lease under PTFA must be at arm's length (not a relative who pays no rent), for fair market rent, and signed before the lis pendens was recorded. See our full guide on PTFA tenant rights in Florida foreclosure for details on what qualifies and what the 90-day notice requirement means in practice.
Unpermitted ADUs and Foreclosure Risk
An ADU that was built without a permit or in violation of local codes creates additional risks during foreclosure:
- Lender appraisals will note the unpermitted structure and may exclude it from the value calculation, lowering your equity position.
- Buyers and title companies are wary of properties with unpermitted structures, making a pre-foreclosure sale harder to execute.
- A code enforcement lien for the violation adds to the total judgment amount in the foreclosure, reducing any surplus fund potential. See our guide on code enforcement liens and foreclosure in Florida.
If you built an ADU without permits, consider the cost of a retroactive permit versus the impact on your foreclosure options. A permitted ADU with documented rental income improves your loss mitigation profile and your property's marketability.
ADU Construction Loans and Junior Liens
Many Florida homeowners financed their ADU through a home equity line of credit (HELOC), a construction loan, or a cash-out refinance. The lender on that construction financing holds a separate lien -- typically junior to the first mortgage.
When the first mortgage lender files for foreclosure and names all junior lienholders as defendants, a completed foreclosure sale wipes out those junior liens. The first mortgage lender gets paid from the sale proceeds, and junior lienholders -- including your ADU construction loan lender -- are extinguished. If your ADU lender is not properly named and served in the foreclosure action, their lien may survive the sale and cloud the new buyer's title.
Can an ADU Create Surplus Funds After a Foreclosure Auction?
Yes, indirectly. A permitted ADU adds value to the property that can drive competitive bidding at the foreclosure auction. If investors bid above the total judgment amount, the excess is surplus under Florida Statute 45.032, and it belongs to you -- not the lender. You must file a timely surplus funds claim with the clerk within 60 days of the sale.
The ADU does not itself create surplus funds. But a well-maintained, permitted ADU with a paying tenant is a more attractive investment property at auction, which can increase the winning bid and therefore the surplus amount.
Barrett Henry: REMAX Collective, 23+ Years of Florida Experience
Barrett Henry is a Broker Associate at REMAX Collective with more than 23 years of experience helping Florida homeowners facing foreclosure. Whether your property has an ADU tenant you need to protect, a HELOC lien from ADU construction, or rental income you want to use in a modification application, Barrett can help you understand your options and connect you with the right resources.
Tampa Bay homeowners receive direct service; homeowners across all 67 Florida counties receive referrals to qualified local professionals. Contact us today for a free, confidential consultation.
Related Resources
- Florida Foreclosure Process -- step-by-step guide to judicial foreclosure in Florida
- Loan Modification in Florida -- how to apply and what income documentation you need
- PTFA Tenant Rights in Florida Foreclosure -- 90-day notice requirements and bona fide lease protections
- HOA vs. Mortgage Foreclosure in Florida -- how HOA liens interact with your first mortgage
- Florida Foreclosure Surplus Funds -- how to claim money left over after the auction
- Code Enforcement Liens and Foreclosure -- how unpermitted structures create additional liens
- Short Sale in Florida -- selling for less than you owe as an alternative to foreclosure
- Deed in Lieu of Foreclosure -- voluntarily transferring the property to the lender
- Forbearance in Florida -- temporarily pausing payments while you stabilize finances
- Florida Foreclosure Checklist -- step-by-step guide for homeowners at every stage of the process
