Can I Build a Guest House on My Property in Florida?

You can build a guest house on your property in Florida, and as of 2026 state law is firmly on your side: Senate Bill 48 amended Florida Statute 163.31771 to bar local governments from prohibiting accessory dwelling units in any zoning district that allows single-family homes.¹ That is the big change. The rest of the project, size limits, setbacks, HOA rules, permits, taxes, insurance, and financing, still lives at the local and private level, and that is where most Florida guest house projects succeed or stall.

What Counts as a Guest House Under Florida Law

Florida Statute 163.31771 defines an accessory dwelling unit as a secondary living space with its own kitchen, bathroom, and sleeping area, located either inside your existing home or as a separate structure on the same lot.¹ A converted garage apartment, an interior conversion of unused space, an attached unit sharing a wall with the main house, and a freestanding backyard cottage all qualify, so long as they contain those three elements.

The earlier version of the statute was far narrower. It only let cities approve ADUs for affordable housing, and owners had to sign affidavits agreeing to rent below market rate.¹ SB-48 removed that bottleneck in three ways. Local governments can no longer prohibit ADUs outright in any single-family zone. They cannot cap ADU size below 1,000 square feet. And they cannot require the owner to live on-site as a condition of approval. These preemptions apply going forward.

What Your City or County Still Decides

SB-48 set a floor, not a ceiling. The specifics of how you build are still local, and the numbers vary enough between jurisdictions that a call to both your county zoning office and your municipal building department belongs at the very top of your to-do list.

Local rules usually cover:

Setbacks from property lines and from the main house. In Tampa, for example, a detached unit under 750 square feet may need only a 3-foot side setback, while a larger structure may require 7 feet on the side and 20 feet from the rear line. Your city’s numbers will differ.²
Height limits. Most localities require the ADU to be shorter than the primary home.
Design standards. Some cities require matching architectural style, exterior materials, or roof pitch.
Impact fees for water, sewer, and road connections. Florida’s 2024 ADU reform reportedly cut these fees in half for ADU construction, but local schedules still apply and can add thousands.
Short-term rental restrictions. SB-48 did not preempt these. Pasco County requires ADU rentals to run longer than 180 days. Tampa sets a seven-day minimum before commercial lodging rules kick in. If Airbnb income is part of your plan, confirm the local rules before you design anything.³²

Both county and municipal rules may apply to the same lot. Verify both.

HOA Rules Still Apply

This is the detail that blindsides homeowners: the state ADU law does not override private deed restrictions or homeowners association covenants. An HOA that prohibits accessory structures, caps lot coverage, limits outbuildings, or restricts rentals can still enforce those rules against your project, even if your city has to approve it. Florida courts have consistently upheld properly recorded private deed restrictions over municipal zoning.

Before hiring an architect, read your HOA’s governing documents and look for anything that touches accessory structures, detached buildings, lot coverage, or rental activity. If a restriction blocks you, the state preemption will not help. Your only route is a variance from the board or a covenant amendment, which usually needs a supermajority vote of the membership.

Permits and Inspections

Once zoning, HOA rules, and your lot all check out, you file for a building permit with your local building department. The application package typically includes a site plan or current survey showing where the proposed structure sits in relation to property lines and existing buildings, plus construction drawings prepared by a Florida-licensed professional engineer or registered architect.⁴

After you submit, multiple reviewers look at the plans. Zoning staff check setback, height, and lot coverage compliance. Building plan reviewers confirm the drawings meet the current Florida Building Code. Review typically takes several weeks, and revisions are common.

Construction then triggers mandatory inspections at the foundation, framing, electrical rough-in, plumbing rough-in, and insulation stages before walls can close. A final inspection confirms the finished unit matches approved plans and code. Only after that does the building department issue a Certificate of Occupancy, which makes the unit legally habitable. No one should move in or start paying rent before that certificate is in hand.

What It Costs

New detached construction in Florida generally starts around $250 per square foot and goes up with finishes, site conditions, and foundation requirements. A basic 600-square-foot unit might run $150,000 to $200,000. A higher-end 1,000-square-foot guest house can easily exceed $300,000. Converting existing attached space costs less because the shell already exists.

Beyond construction, plan for:

Permit and impact fees, usually $4,000 to $7,500 in Florida, though some jurisdictions charge more. Recent impact fee reductions may lower this.
A current property survey, roughly $400 to $1,500 depending on lot size.
Architectural and engineering plans, which run several thousand dollars for code-compliant drawings.
Utility connections. A detached unit needs its own water, sewer, and electrical service, and trenching costs depend on distance to existing lines.

Get detailed bids from licensed contractors before committing. The total tends to surprise homeowners who pictured a simple backyard cottage.

Property Tax Impact

A guest house raises the taxable value of your property, but Florida law softens the blow. A property appraiser cannot deny or revoke your homestead exemption just because you build or rent an ADU. Your primary home keeps its homestead exemption and its Save Our Homes assessment cap. The ADU is assessed separately on its own just value and use.

Rent the unit to the general market, and the ADU portion is taxed at the non-homestead rate. That higher rate applies only to the guest house, not to the rest of the lot or the main house.

Florida also offers a specific break for family caregiving. Under Florida Statute 193.703, if you build the guest house to house a parent or grandparent who is 62 or older, you may qualify for a reduction in assessed value equal to the increase caused by the ADU construction, up to 20 percent of the total property value. For families building for aging parents, this granny flat provision can meaningfully offset the tax impact.

Federal Taxes If You Rent It Out

Rental income from a guest house is reported on Schedule E of your federal return.⁵ Rental expenses offset the income. Deductible items include the share of mortgage interest, property taxes, insurance, maintenance, utilities, and depreciation attributable to the unit.⁶

Depreciation is usually the largest paper deduction. The IRS lets you write off the building value, not the land, over 27.5 years, which works out to roughly 3.636 percent a year. On a $200,000 guest house, that is about $7,270 in annual depreciation before you spend a dollar on repairs.

There is a useful exception for occasional rentals. Rent the guest house for fewer than 15 days in the year and you do not report the income at all; the IRS treats the rental as if it never happened.⁵ That can work well for a major local event or a handful of weekends.

On the other side, if you use the unit personally for more than 14 days or more than 10 percent of total rental days, whichever is greater, the IRS classifies it as a personal residence. That caps your rental expense deductions at your gross rental income, though disallowed losses can carry forward.⁵ Passive activity loss rules can also limit deductions at higher income levels. A tax professional who handles rental property is worth the fee.

Insurance

A standard homeowners policy includes other structures coverage, usually set at 10 percent of your dwelling coverage. If your home is insured for $400,000, that is $40,000 for detached structures, rarely enough for a guest house that cost $150,000 or more to build.

Call your insurer before construction starts. You will likely need to raise the other structures limit or add a specific endorsement for the ADU. If you plan to rent, a standard homeowners policy may not cover tenant-related liability at all, and you may need a landlord policy or a rental dwelling endorsement. Letting a tenant move in without updating the policy can leave you exposed to uninsured claims.

Financing a Guest House

Two major federal mortgage programs now recognize ADU rental income, which has opened up financing options.

FHA-insured loans let borrowers count projected ADU rental income toward qualifying income when buying a home with an existing or planned ADU. The lender uses 75 percent of the lesser of the appraised fair market rent or the actual lease amount, and ADU income cannot exceed 30 percent of total qualifying income. Two months of mortgage reserves after closing are required when ADU income is used. FHA does not allow ADU rental income on cash-out refinances.⁷

Fannie Mae updated its policy in March 2026 to allow ADU rental income for qualifying as well. The property must be a one-unit principal residence, the transaction must be a purchase or limited cash-out refinance, and qualifying rental income from the ADU cannot exceed 30 percent of total qualifying income. Only one ADU’s income counts.⁸

Beyond mortgage programs, owners commonly fund ADU construction with home equity loans, home equity lines of credit, or construction loans. Cash-out refinancing is another route, with the FHA caveat noted above. The best path depends on your existing equity, credit profile, and whether the ADU is part of a purchase or an addition to a property you already own.

Mistakes to Avoid Before You Break Ground

A few practical pitfalls catch homeowners repeatedly.

Skipping the zoning check is the most expensive. If your lot cannot meet setbacks once the ADU is placed, no amount of design creativity fixes it. Run the numbers on paper before paying for architectural plans.

Ignoring utility capacity is next. Older properties may have water and sewer lines sized for a single dwelling. Adding a second kitchen and bathroom can force an upgrade from the main to the street, and that cost rarely appears in initial estimates.

Assuming the guest house can be a short-term rental is the third. Many owners build with Airbnb projections only to find their local ordinance restricts ADU rentals to 180 days or longer. Confirm the rental rules before you base any financial model on nightly rates.

Finally, do not build without permits. Unpermitted structures cause problems when you sell, when you file an insurance claim, and when a code complaint lands. The permitting process takes time, and it protects the money you are about to spend.

1
Florida Senate. Florida Statutes 163.31771 – Accessory Dwelling Units
2
City of Tampa. Accessory Dwelling Units and Extended Family Residences FAQs
3
Pasco County Government. Accessory Dwelling Units
4
Orange County Government. Residential Accessory Dwelling Unit Permit Information
5
Internal Revenue Service. Renting Residential and Vacation Property
6
Internal Revenue Service. 2025 Instructions for Schedule E (Form 1040)
7
U.S. Department of Housing and Urban Development. Mortgagee Letter 2023-17 – Revisions to Rental Income Policies, Property Eligibility, and Appraisal Protocols for Accessory Dwelling Units
8
Fannie Mae. Rental Income