What are the hidden costs of owning a Keys home?

1. Homeowners Insurance

Homeowners insurance is one of the biggest ongoing expenses of owning a Keys home, and the premium depends on the individual property and insurer. Your rate is shaped by location, replacement cost, construction type, roof age and condition, electrical system, plumbing, HVAC, previous claims, storm-resistant features, wind mitigation, property condition, coverage limits, and deductibles.

Florida's Department of Financial Services explains that insurers may require inspections as part of underwriting. For older homes, a 4-point inspection can examine the roof, plumbing, electrical, and heating and air-conditioning systems, and insurers may also request specialized roof inspections.

Why it matters in the Keys: do not just ask what the seller paid. Get a new quote for yourself on the specific property. The seller's policy may have different coverage, deductibles, discounts, insurer, claims history, and policy terms, and the insurer may evaluate the property differently when you apply.

Pay attention to deductibles. Florida policies can carry hurricane deductibles, and DFS recommends that consumers understand their deductible structure. A cheaper premium is not necessarily the better deal if it comes with much higher out-of-pocket exposure after a storm.

What to request before closing:

• Annual premium and coverage limits
• Hurricane deductible and all-perils deductible
• Roof coverage terms and wind coverage
• Exclusions and available mitigation discounts
• Flood insurance requirements and required inspections

Do not make a final purchase decision before knowing whether the property is insurable at a price you can actually afford.

2. Flood Insurance

Flood insurance deserves its own category in the Keys. Monroe County states that all of Monroe County is in a floodplain, and flood damage is not covered by a standard homeowners policy.

Flood insurance is property-specific. FEMA's Risk Rating 2.0 uses property-specific characteristics rather than relying solely on the traditional flood zone. Monroe County recommends obtaining an Elevation Certificate, because accurate elevation information can affect the flood-insurance rating.

Monroe County has a significant Community Rating System discount. Unincorporated Monroe County participates in FEMA's Community Rating System as a Class 3 community, with a 35% discount on NFIP premiums for eligible policyholders in the unincorporated area. But do not assume the same discount applies everywhere. Municipalities have their own participation and classifications.

Before buying, get an actual flood quote and ask for the current flood policy if one exists, the flood zone, the Elevation Certificate, coverage amount, deductible, prior flood claims, flood-loss history, and whether the property has been substantially damaged or repeatedly flooded. The important number is not the average flood premium for the Keys; it is the premium for the property you are actually buying.

3. Wind Insurance and Wind-Mitigation Costs

Monroe County identifies the cost and availability of wind insurance as a significant local housing issue, reporting that the vast majority of properties in the county have wind coverage through Citizens Property Insurance.

Wind mitigation can save money. Florida insurers are required to offer certain hurricane-loss-mitigation discounts. A wind-mitigation inspection documents features that reduce hurricane-related risk, including roof characteristics, roof-to-wall connections, wall construction, opening protection, secondary water resistance, and other storm-resistant features. DFS states that insurers must accept a valid Uniform Mitigation Verification Inspection Form completed by an authorized inspector.

Important 2026 update: the current Uniform Mitigation Verification Inspection Form was revised effective April 1, 2026, and a completed form can generally remain valid for up to five years as long as there are no material changes or inaccuracies.

A buyer should ask: "Is there a current wind-mitigation inspection for this property, and what discounts does the insurance quote reflect?" Do not assume the house qualifies for every possible discount just because it has impact windows or a newer roof.

4. Property Taxes

Taxes can surprise buyers because the seller's current tax bill is not necessarily what the buyer will pay. Florida's system distinguishes just value, assessed value, taxable value, and tax liability. A change in ownership can cause reassessment, potentially eliminating the seller's existing assessment limitations or exemptions.

Homestead: a qualifying Florida homestead may receive up to a $50,000 exemption and may qualify for the Save Our Homes assessment limitation. After the first year, annual increases in assessed value are generally limited to the lower of 3% or the applicable CPI change, subject to Florida law. But the seller's benefit does not transfer to the buyer. Florida's Department of Revenue warns that new homeowners can find taxes higher than the previous owner's because a change of ownership can result in reassessment to just value.

Second home or investment property: do not automatically budget using a seller's homesteaded tax bill. The better approach is to ask the Monroe County Property Appraiser or your real-estate professional to estimate the likely post-purchase assessment.

5. Seawall Maintenance and Replacement

This applies primarily to waterfront properties. A seawall is infrastructure that protects the property from water, erosion, and soil loss. Potential expenses include inspections, repairs, tiebacks, cap repairs, structural repairs, corrosion control, erosion control, replacement, engineering, and permitting.

A seawall can appear acceptable from the land side while deteriorating below the waterline. If you are buying with an older seawall, have it evaluated by a qualified marine contractor or structural professional. Investigate the permit history, and do not assume that because the seawall is already there it can automatically be rebuilt in exactly the same way. Waterfront construction can involve Monroe County, the Florida DEP, the U.S. Army Corps of Engineers, and other regulatory authorities depending on the project.

6. Dock and Boat-Lift Costs

A waterfront property with a dock can be considerably more expensive to maintain. Potential costs include dock decking, pilings, hardware, fasteners, electrical equipment, lighting, boat-lift motors, cables, pulleys, structural components, storm damage, repairs, and replacement. Saltwater is particularly hard on metal, electrical components, and other exposed materials.

Permits: verify that existing docks, boat lifts, and seawalls were properly permitted. Do not assume an existing structure automatically has the approvals necessary for future repairs, replacement, or expansion.

If you are buying primarily for boating, also investigate canal depth, low-tide access, bridge clearance, canal width, turning room, distance to open water, whether dredging would be possible, and environmental restrictions. A property can be marketed as waterfront without necessarily being ideal for the boat you own.

7. HOA and Condominium Fees

These are not necessarily a bad thing. They can cover services you would otherwise pay for yourself, including landscaping, pool maintenance, common-area insurance, building maintenance, roads, security, amenities, exterior maintenance, roof-related expenses, and reserves.

Look beyond the current monthly fee, and ask about special assessments. A low HOA fee does not necessarily mean low ownership costs. A condo association could have a significant upcoming expense involving roof, structural repairs, elevators, building systems, waterproofing, insurance, or other common elements. Florida's condominium laws provide for special assessments when expenses fall outside the adopted annual budget, and Florida's condominium regulatory framework has increased requirements around structural integrity reserve studies and related financial planning.

Before buying a condo, request the current budget, reserve study, Structural Integrity Reserve Study when applicable, recent meeting minutes, current or proposed special assessments, association financial statements, insurance information, pending litigation, maintenance history, and rules and restrictions.

Do not evaluate a condo solely by asking "What's the HOA?" Ask "What does the HOA fee cover, how healthy are the reserves, and what major expenses are coming?"

8. Hurricane Preparation and Storm-Related Expenses

Planning for hurricanes can be part of normal property ownership in the Keys. Potential expenses include hurricane shutters, impact windows, storm panels, a generator, generator maintenance and fuel, tree trimming, roof maintenance, storm supplies, yard preparation, outdoor furniture storage, boat preparation, dock preparation, post-storm cleanup, and emergency repairs.

Waterfront owners have additional concerns: boat removal, boat-lift preparation, dock preparation, loose equipment, outdoor furniture, pool equipment, storm shutters, and seawall and dock concerns.

If you are buying a second home and will not be present, you may need someone local who can prepare the property before a storm and inspect it afterward.

9. Property Management for Absentee Owners

An out-of-state owner should budget for more than just property management if the home will sit vacant for portions of the year. You may need someone to handle storm preparation, storm inspections, plumbing issues, HVAC problems, landscaping, pool service, pest control, cleaning, general maintenance, contractor access, insurance inspections, and emergency repairs.

Vacation rental owners have additional expenses. If legally operating a vacation rental in unincorporated Monroe County, vacation rentals must be located in an area where the use is permitted, applicable properties require a vacation-rental manager license and a fire and life-safety inspection, and all rentals require a business tax license.

The financial calculation for an investment property should potentially include management, cleaning, maintenance, rental licensing, business tax, insurance, utilities, supplies, platform and booking costs, and repairs. Do not assume that because a property has historically been rented short-term you automatically have the right to continue doing so.

10. Utilities Can Add Up

Include electricity, water, wastewater and sewer, internet, trash, pool equipment, irrigation, HVAC, and landscaping. Electricity is especially important because air conditioning is a major part of normal household operation. Keys Energy Services currently lists a residential base energy charge of $0.1142 per kWh, but the actual bill also includes other components such as the power-cost adjustment, customer charge, storm surcharge, and applicable taxes.

Water and wastewater charges have fixed and usage-based components. The Florida Keys Aqueduct Authority's published rate schedule includes a single-family residential wastewater base facility charge plus a per-thousand-gallon wastewater flow charge, subject to its applicable billing rules.

The best method is to request the seller's 12 months of utility bills rather than estimating from a generic average.

11. Maintenance Can Be Higher in the Keys

Salt air and humidity contribute to corrosion and deterioration of outdoor HVAC equipment, metal railings, fasteners, outdoor electrical components, lighting, door hardware, fences, pool equipment, dock hardware, boat lifts, vehicles, and outdoor appliances. Not every Keys home has unusually high maintenance costs, but waterfront and ocean-exposed properties can require more frequent attention.

Budget for replacement cycles, not just repairs: roof, HVAC, water heater, appliances, seawall, dock, boat lift, and exterior finishes. A house can be perfectly affordable today while several major components are approaching the end of their useful life.

12. Pool Expenses

Budget for pool service, chemicals, electricity, the pump, the filter, repairs, resurfacing, equipment replacement, and storm preparation. For a vacation home, you will generally want someone local checking the pool even when you are away.

13. Roof Maintenance and Eventual Replacement

The roof affects both maintenance and insurance. Insurance companies may consider roof age, condition, and construction characteristics. DFS notes that roof age and condition can affect insurance discounts, and insurers may request specialized roof inspections.

Before buying an older Keys home, determine the roof age, roof material, permit history, previous repairs, remaining useful life, wind-mitigation characteristics, insurance requirements, and replacement cost. A roof with only a few years of remaining life can become a significant near-term ownership expense.

14. Pest Control and Termites

Warm, humid conditions make pest management another expense: termite inspections, termite prevention, general pest control, rodent control, and moisture-related pest management.

For an older property, do not just ask whether there are currently termites. Ask "Has the property ever had termite treatment or damage?" and request documentation if treatment has occurred.

15. Landscaping and Vegetation Management

Landscaping can be expensive because of the environment and storm exposure: lawn care, tree trimming, palm maintenance, irrigation, storm cleanup, removal of dead branches, and hurricane preparation. Trees close to the home can become an insurance or storm-risk consideration. DFS notes that insurers can evaluate property maintenance and hazards during underwriting inspections.

16. Septic, Sewer, and Wastewater Considerations

Not every Keys property has the same wastewater situation. Before purchasing, determine whether the property is connected to central sewer, whether it uses a septic system, whether there are outstanding connection requirements, septic age and condition, pumping history, inspection requirements, and any pending sewer-related assessments or costs. Do not assume every property in the Keys has identical infrastructure.

17. Special Assessments and Infrastructure Costs

This is particularly important for condos, HOAs, waterfront communities, and older developments. Ask whether there are planned or recently completed projects involving roads, bridges, drainage, seawalls, clubhouses, pools, roofs, building exteriors, and stormwater systems. A buyer who only looks at the monthly HOA payment can miss a major upcoming assessment.

18. Financing and Closing Costs

The mortgage payment is not the only cost at closing. Buyers may encounter loan origination charges, appraisal, inspection costs, survey, title services, title insurance, recording fees, prepaid taxes, insurance premiums, escrow funding, and HOA and condo transfer fees. For a waterfront property, you may also spend more during due diligence because of additional inspections and professional reviews.

19. The Opportunity Cost of a Keys Investment Property

Do not calculate profitability using rent minus mortgage. A realistic calculation is gross rental income minus mortgage, property taxes, homeowners insurance, flood insurance, wind insurance, HOA, utilities, property management, cleaning, repairs, maintenance, landscaping, pool, licensing, business taxes, booking and platform costs, vacancy, and capital expenditures equals actual operating cash flow.

Before using projected rental income, verify the property is actually permitted for the rental strategy you intend to use. Monroe County restricts vacation rentals by location and zoning, and applicable vacation rentals have additional licensing requirements.

Next: A Better Way to Calculate the True Cost

For a $1,000,000 home, do not just convert purchase price to mortgage payment. Build an annual budget like the worksheet below. The numbers must come from the specific property you are buying, not generic Florida averages. Fill in each row, and the total gives you the true annual cost of ownership.

The numbers should come from the specific property and your own quotes, not generic Florida averages.

What Should a Buyer Request from the Seller?

Before closing, ask for as much of the following as possible so there are no surprises after you own the property.

• Insurance: current homeowners policy, wind policy, flood policy, claims history, wind mitigation report, 4-point inspection, and roof documentation.
• Taxes: current tax bill, property appraiser record, homestead status, and assessment history.
• Property: survey, Elevation Certificate, building permits, Certificate of Occupancy, open permits, code violations, and previous inspection reports.
• Waterfront: seawall permits, dock permits, boat-lift permits, marine surveys, seawall inspections, dock inspections, water-depth information, and easements and access documentation.
• HOA / condo: current budget, reserve information, recent meeting minutes, special assessments, insurance information, pending projects, and rules and restrictions.
• Operating costs: 12 months of electric bills, 12 months of water and sewer bills, pool expenses, landscaping, pest control, and maintenance records.

If it is an investment property, also request rental history, occupancy and revenue records, the management agreement, vacation-rental permit, business tax documentation, and any applicable licensing.

The Biggest Florida Keys Budgeting Mistake

The biggest mistake is looking at a property and thinking "I can afford the mortgage." The better question is "Can I comfortably afford everything this property costs to own?"

For a Keys home, that could mean mortgage, property taxes, homeowners insurance, wind insurance, flood insurance, HOA and condo fees, utilities, maintenance, hurricane preparation, capital reserves, waterfront infrastructure, and property management if applicable. The answer can be very different depending on whether you are buying a condo in Key West, a suburban home in Key Largo, a waterfront home in Marathon, or a second home with a seawall and boat lift in the Lower Keys.