Yes, you can build a guest house on your property in Florida, and a 2026 change in state law made it considerably harder for local governments to say no. Senate Bill 48 amended Florida’s accessory dwelling unit statute to bar cities and counties from prohibiting ADUs in any zoning district that allows single-family homes. Local rules still shape the size, placement, and appearance of what you build, and private HOA covenants can still stop the project entirely, but the baseline answer at the state level is now yes.
What Counts as a Guest House in Florida
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.1Florida Senate. Florida Statutes 163.31771 – Accessory Dwelling Units A converted garage apartment, an interior conversion of unused space, an attached unit sharing a wall with your house, and a brand-new detached cottage all qualify, provided each has the kitchen, bathroom, and sleeping area the statute requires. A shed, a pool house without a kitchen, or a bonus room without a bathroom is not an ADU under this definition.
What the State Now Protects
SB-48 changed three things that used to trip up ADU projects. Local governments can no longer prohibit ADUs outright in any zoning district that allows single-family residential use. Cities cannot cap ADU size below 1,000 square feet, setting a statewide floor that overrides tighter local limits. And local governments cannot require the property owner to live on-site as a condition of approval. These preemptions apply to new approvals going forward.
What Your City or County Still Controls
SB-48 set a floor, not a ceiling. Cities and counties keep meaningful authority over how a guest house gets built, and the details differ enough between jurisdictions that a call to your local zoning and building departments is the single most important step before spending any money on the project.
Local rules typically cover:
- Setbacks from property lines and the primary home. In Tampa, for example, a detached structure under 750 square feet may need only a 3-foot side setback, while a larger unit can require 7 feet on the side and 20 feet from the rear line. Your jurisdiction’s numbers will differ.2City of Tampa. Accessory Dwelling Units and Extended Family Residences FAQs
- Height limits, which usually require the ADU to be shorter than the primary home.
- Design standards, including matching the main home’s architectural style, exterior materials, or roof pitch.
- Impact fees for connecting to water, sewer, and roads. Florida’s 2024 ADU reform reportedly cut those fees by 50 percent for ADU construction, but local schedules still apply and can add thousands to the project.
- Short-term rental restrictions, which SB-48 did not preempt. Pasco County requires ADU rentals to run longer than 180 days, and Tampa sets a seven-day minimum before a unit triggers commercial lodging rules.3Pasco County Government. Accessory Dwelling Units2City of Tampa. Accessory Dwelling Units and Extended Family Residences FAQs
Because both county and municipal rules can apply to the same property, contact both offices before you commit to a design.
HOA Covenants Can Still Block Your Project
Here is the detail that catches homeowners off guard: Florida’s ADU law does not override private deed restrictions or homeowners association covenants. An HOA that prohibits accessory structures, restricts outbuildings, caps lot coverage, or limits rentals can enforce those covenants against your guest house project even though state law tells the city to approve it. Florida courts have consistently upheld properly recorded private deed restrictions over municipal zoning.
Before hiring an architect, pull your HOA’s governing documents and look for restrictions on accessory structures, detached buildings, lot coverage percentages, or rental activity. If any of those apply, the state preemption won’t help. You would need the board to grant a variance or the membership to amend the covenants, which typically takes a supermajority vote.
Permits and Inspections
Once zoning, HOA rules, and lot dimensions all support the project, apply for a building permit through your local building department. The application package usually requires a current survey or site plan showing where the structure will sit relative to property lines and existing buildings, plus construction drawings prepared by a Florida-licensed engineer or registered architect.4Orange County Government. Residential Accessory Dwelling Unit Permit Information
Zoning staff confirm the structure complies with setback, height, and lot coverage rules. Building plan reviewers check the drawings against the current Florida Building Code. Review can take several weeks, and departments sometimes ask for revisions before issuing the permit.
During construction, inspectors sign off at each key stage: foundation, framing, electrical rough-in, plumbing rough-in, and insulation before walls close up. A final inspection confirms the finished unit matches the approved plans and code. Only then does the building department issue a Certificate of Occupancy, which makes the guest house legally habitable. No one should move in or start paying rent before that certificate is in hand.
What It Costs
Construction for a detached guest house in Florida generally starts around $250 per square foot for new work and rises with finishes, site conditions, and foundation type. A basic 600-square-foot unit might run $150,000 to $200,000. A larger or higher-end 1,000-square-foot cottage can easily exceed $300,000. Attached conversions of existing space tend to cost less because the shell already exists.
Beyond construction, budget for:
- Permit and impact fees, typically $4,000 to $7,500 in Florida, sometimes higher, with recent legislation reducing some ADU impact fees.
- A current property survey, usually $400 to $1,500 depending on lot size.
- Architectural and engineering plans, several thousand dollars for code-compliant drawings.
- Utility connections for water, sewer, and electric. Trenching and hookup costs vary sharply with distance from existing service lines.
Get detailed bids from licensed contractors before committing, even if you ultimately hire someone else.
How a Guest House Affects Your Property Taxes
Building a guest house raises the taxable value of your property, but Florida’s 2026 legislation limits the damage. A property appraiser cannot deny or revoke your homestead exemption solely because you build or rent an ADU. Your primary home stays under the existing homestead exemption and the Save Our Homes assessment cap. The ADU itself is assessed separately based on its just value and use.
If you rent the unit on the open market, the ADU portion is taxed at the non-homestead rate, but that higher rate applies only to the guest house, not the rest of your lot or the primary residence.
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, up to 20 percent of total property value. This “granny flat” provision can meaningfully offset the tax bump for homeowners building to house aging parents.
Federal Tax Rules if You Rent It Out
If you collect rent, the IRS expects you to report it on Schedule E.5Internal Revenue Service. Renting Residential and Vacation Property Rental expenses reduce the taxable amount. You can deduct mortgage interest allocable to the unit, property taxes, insurance, maintenance, utilities, and depreciation.6Internal Revenue Service. 2025 Instructions for Schedule E (Form 1040)
Depreciation is the largest paper deduction most ADU landlords claim. The IRS lets you write off the building’s value (not the land) over 27.5 years, roughly 3.636 percent per year. On a guest house built for $200,000, that is about $7,270 a year in depreciation before you spend a dollar on repairs.
Short rentals get a specific carve-out. If you rent the guest house for fewer than 15 days in a year, you do not report the rental income at all, and the IRS treats it as if the rental never happened.5Internal Revenue Service. Renting Residential and Vacation Property That can be useful if you only rent during a major local event.
If you use the guest house personally for more than 14 days or more than 10 percent of the total rental days, whichever is greater, the IRS classifies it as a personal residence. That limits rental expense deductions to your gross rental income, though disallowed losses carry forward.5Internal Revenue Service. Renting Residential and Vacation Property Passive activity loss rules can further restrict deductions above certain income levels. A tax professional familiar with rental property is worth the fee.
Insurance Coverage
A standard homeowners policy includes “other structures” coverage equal to about 10 percent of your dwelling coverage. On a home insured for $400,000, that is $40,000, rarely enough for a guest house that cost $150,000 or more to build.
Talk to your insurer before construction starts. You will likely need to raise the other-structures limit or add a specific ADU endorsement. If you plan to rent the unit, a standard homeowners policy may not cover tenant-related liability at all, and you may need a landlord policy or a rental dwelling endorsement. Failing to update coverage before a tenant moves in can leave you exposed to uninsured claims.
Financing Options
Two federal mortgage programs now recognize ADU rental income, which makes financing easier than it was a few years ago.
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 your 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.7U.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
Fannie Mae updated its policy in March 2026 to allow ADU rental income for qualifying purposes. 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 even if the property has multiple units.8Fannie Mae. Rental Income
Homeowners also commonly fund ADU construction with home equity loans, HELOCs, construction loans, or cash-out refinancing. The right path depends on your equity, credit profile, and whether you are adding the ADU to a property you already own or building it as part of a purchase.
Mistakes That Stall Projects
A few practical pitfalls come up often enough to flag.
Skipping the zoning check is the most expensive one. If your lot is too small to meet setback requirements once the ADU is placed, no design creativity will fix it. Run the numbers on paper before paying for plans.
Ignoring utility capacity is second. Older properties may have water and sewer lines sized for a single dwelling, and adding a second kitchen and bathroom can force an upgrade from the main to the street. That cost rarely appears in initial estimates.
Assuming the guest house can be a short-term rental is third. Many owners build with Airbnb projections in mind, only to find their local ordinance limits ADU rentals to terms of 180 days or longer. Confirm rental rules before basing your numbers on nightly rates.
Building without permits is never worth it. Unpermitted structures create problems when you sell, file an insurance claim, or face a code enforcement complaint. The permit process takes time, but it protects the investment.