Repairing a flood-damaged older home in St. Petersburg: permits, the 49% rule and historic houses

Hurricane Helene pushed water higher than ever recorded at St. Petersburg's tide gauge. The National Hurricane Center's report on Helene says the St. Petersburg tide gauge measured 6.31 feet above mean higher high water (MHHW), passing the previous record of 3.97 feet set by Hurricane Elena in 1985, in a record going back to 1947. Two weeks later, a gauge near St. Petersburg recorded 20.40 inches of rain from Hurricane Milton, the storm's highest reported total. The city says more than 12,000 properties were identified as damaged.

U.S. Census estimates put the median year built in St. Petersburg at 1969. About 70% of the city's 141,508 housing units were built before 1980, and about 37% in 1959 or earlier. Repairing one after a flood means the city's own flood rule, sometimes historic review, and materials that weren't made to get wet.

Photograph it before you touch anything

Photograph every room, the water line (measure it from the floor), cabinets, appliances and the electrical panel. For a storm-repair permit, St. Petersburg asks homeowners to bring photo ID, a floor layout and a summary of the damage to the Municipal Services Center, and to email photos or videos to floodplain@stpete.org, so your photos do double duty.

What you can remove before you get a permit

The city's storm permitting page says no permit is needed for "the removal of storm-damaged contents and materials, such as drywall and insulation, carpet and flooring, cabinets, countertops, and other fixtures." It adds a note: "A building permit is required before these items are repaired, replaced, or installed."

Putting things back is where permits come in. The same page says a permit is required "for all work to repair your home if you sustained storm damage, including but not limited to drywall, floors, doors, cabinetry, and interior/exterior finishes," and that "Doing unpermitted repairs will result in a violation." (The city's hurricane center page says minor cosmetic work "may not require a permit," so ask before you start.)

Florida's new under-$7,500 permit exemption doesn't help in a flood zone, and St. Petersburg also excludes structural, window and door, electrical, plumbing, mechanical and gas work. The law excludes property "partially or entirely located in a flood hazard area" (s. 553.79(1)(g), Fla. Stat.), and the city's permits page says the same. The city's fee waiver for Helene and Milton repairs ended July 31, 2025.

St. Petersburg's 49% rule

The city quotes its floodplain ordinance: substantial damage is "Any combination of repair, reconstruction, or other improvement of a structure where the cumulative cost equals or exceeds 49% of the pre-damaged market value of the structure before the improvement or repair is started." The federal minimum is 50%. The city says all homes in the Special Flood Hazard Area are subject to it.

If a home crosses that line, the city says "you will be required to bring the structure into compliance with current zoning, building, and floodplain management requirements," which "may be done by elevating the existing structure or rebuilding to meet these standards." The city adds that the rule applies "even if the damage is not caused by flooding," and "even if you do the work yourself or use donated materials." Raising a house and its cost are covered in our Tarpon Springs post and house-raising price guide.

How the city adds up your repair costs

The city's Substantial Improvement/Substantial Damage review package, required when the estimated construction value is "25 Percent or more of the market value of the structure," spells out the math:

• Market value is the "tax assessment value of your structure (excluding the land)" from the Pinellas County Property Appraiser. You can submit a state-licensed appraiser's appraisal from the last 12 months, of the pre-storm structure, if you disagree.
• The estimate has to be "a complete, detailed, and itemized (materials and labor) cost estimate," and must include "all costs necessary to fully repair the structure to its before-damage condition." The city says "For damage repairs, pre-storm prices and rates will be utilized."
• Counted: structure, floors and ceilings, windows and doors, re-roofing, exterior finishes including painting, drywall, cabinets, flooring, HVAC, plumbing, electrical, built-in appliances, demolition labor, and overhead and profit.
• Not counted: plans and surveys, permit fees, debris removal and cleanup (including "building dry out"), contents, and outside items like landscaping, fences, pools, sheds and detached garages.
• The owner signs a notarized affidavit that the list covers all the damage.

Florida law bars participating communities from enforcing a cumulative substantial improvement period (s. 163.31795, Fla. Stat.); the city's rule says "cumulative cost," so ask whether earlier permits count. The city's Construction Services and Permitting Division is at StormRecoveryPermits@stpete.org or 727-893-7231.

Older and historic homes

City historic preservation staff review changes to local landmarks and properties in local historic districts through Certificates of Appropriateness. The city also says: "The listing of a property in the National Register does not place restrictions on a private owner's future alterations unless Federal assistance is involved in the project." The city's historic preservation map shows which properties are designated.

The city's Design Guidelines for Historic Properties (2017) say owners in highly vulnerable locations can "consider elevating the building on to new piers, pilasters or bermed earth as a measure of long term preservation," and that "Treatments should be reversible."

FEMA's guidance says communities don't have to require historic structures to be brought into flood compliance when they're substantially damaged, but its definition "does not include structures that are merely old" or "that happen to be located in historic districts." We couldn't confirm whether St. Petersburg handles historic homes with an exemption or a variance, so ask both the floodplain office and historic preservation staff (727-892-5451 or 727-892-5470) before you plan the work. Also, Florida's guaranteed right to a permit to demolish a flood-prone home doesn't cover homes on the National Register or designated historic on or before January 1, 2022 (or later with the owner's consent) (s. 553.79(25)).

Rebuilding with materials that can get wet

If the home has to come into compliance, the city's package says "all electrical and mechanical (heating and cooling, etc.), bathrooms, and laundry rooms must be elevated to or above the DFE," and "Only parking, building access, and limited, incidental storage is allowed below the flood level." A 2023 city flood report says St. Petersburg requires two feet of freeboard for new and substantially improved buildings; confirm your design flood elevation with the city.

FEMA's Technical Bulletin 2 (January 2025) says building materials below the base flood elevation in flood zones "must be flood damage resistant regardless of the historical or expected flood duration." Its unacceptable examples include paper-faced drywall, plaster, fiberglass insulation, carpet and wood or particleboard cabinets; acceptable ones include concrete block, closed-cell foam insulation, mortar-set ceramic tile, metal cabinets and non-paper-faced gypsum board.

Help paying to come into compliance

FEMA's Increased Cost of Compliance coverage, part of an NFIP flood policy, can pay up to $30,000 toward elevating, demolishing or relocating a flood-damaged home (floodproofing is mainly for non-residential buildings) in a high-risk zone when repairs "will cost 50 percent or more of the building's pre-damage market value." Since St. Petersburg uses 49%, ask your flood insurer how a determination between 49% and 50% is handled (NFIP: 1-800-427-4661).

What flood repairs typically cost

How much does it cost to repair flood damage?

In Tampa, Angi puts water damage restoration at $1,962 to $7,250, with an average of $4,606, and black-water cleanup at about $7.50 per square foot. The price climbs with how high the water got, how long it sat, and whether the home must be brought up to current flood standards. See the full price guide for water and flood damage repair costs.

How we help

After the estimate visit, you get a written quote within 48 hours; if you're in a flood zone, tell us up front, since the city asks for an itemized estimate. Our storm damage repair work covers drywall, framing, cabinets, doors and finishes; on projects we manage, electrical, plumbing and HVAC work is done by licensed trade partners who pull their own permits. We don't elevate houses, and the city's floodplain office, not us, decides whether a home is substantially damaged.

Frequently asked questions

Does St. Petersburg use the 49% rule or the 50% rule?

St. Petersburg uses 49%. The city's floodplain ordinance defines substantial damage as repairs whose cumulative cost "equals or exceeds 49%" of the structure's pre-damage market value. The federal minimum is 50%.

Do I need a permit to repair flood damage in St. Petersburg?

For repairs, yes. The city says a permit is required for all storm damage repairs, including drywall, floors, doors, cabinetry and finishes. Removing damaged materials like drywall, insulation, carpet and cabinets doesn't need one.

Is a historic home exempt from the 49% rule?

Not automatically. FEMA lets communities treat certain historic structures differently, but not homes that are merely old or simply happen to be in a historic district. Ask St. Petersburg's floodplain office and historic preservation staff about your house.

Does Florida's $7,500 permit exemption apply to flood repairs?

No. The exemption in s. 553.79(1)(g) doesn't apply to property partially or entirely in a flood hazard area, or to electrical, plumbing, structural, mechanical or gas work on a single-family home.

Sources

• National Hurricane Center: Tropical Cyclone Report, Hurricane Helene (PDF)
• National Hurricane Center: Tropical Cyclone Report, Hurricane Milton (PDF)
• U.S. Census Bureau, ACS 2024 5-year, St. Petersburg city: Year structure built (B25034)
• U.S. Census Bureau, ACS 2024 5-year, St. Petersburg city: Median year structure built (B25035)
• City of St. Petersburg: Permitting after a storm
• City of St. Petersburg: Damage assessment
• City of St. Petersburg: Flooding
• City of St. Petersburg: Hurricane center
• City of St. Petersburg: Building permits
• City of St. Petersburg: Floodplain Substantial Improvement/Substantial Damage review package (PDF)
• City of St. Petersburg: List of exempted permits (PDF)
• City of St. Petersburg: Repetitive Loss Area Analysis, 2023 (PDF)
• City of St. Petersburg: Historic preservation
• City of St. Petersburg: Design Guidelines for Historic Properties (PDF)
• FEMA P-758, Substantial Improvement/Substantial Damage Desk Reference (PDF)
• FEMA Technical Bulletin 2, Flood Damage-Resistant Materials Requirements (January 2025, PDF)
• FEMA: Increased Cost of Compliance coverage
• U.S. EPA, "Flood Cleanup to Protect Indoor Air and Your Health"
• Florida Statutes s. 553.79 (2026)
• Florida Statutes s. 163.31795 (2026)
• Angi, water damage restoration cost in Tampa (updated Aug. 9, 2026)
• Angi, flooring installation cost in Tampa (updated Aug. 4, 2026)
• Angi, electrical box replacement cost in Tampa (updated July 31, 2026)
• Angi, elevation certificate cost (national, updated May 30, 2026)
• Handoff, remove wallboard cost in Tampa (2026)
• Handoff, install drywall cost in Tampa (2026)