Unincorporated Hillsborough County
Apollo Beach In-Law Suites, Priced Against the Flood Rule
In Apollo Beach, get the elevation certificate and the structure value in hand before anyone sketches a suite, because the flood rule is likely to set the size of the job. ZIP code 33572, which covers Apollo Beach, recorded 985 NFIP claims, 791 of them in 2024 alone.
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Who the space is for, whether it needs a kitchen, and the address. With those three answers we can say which city or county rules govern the lot before a contractor draws anything.
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Apollo Beach's 2024 flood claims and the county's counting rules
OpenFEMA NFIP claims by reported ZIP code (as of September 2026): Apollo Beach ZIP 33572: 985 claims (791 in 2024, $86.8 million paid); Riverview ZIP 33569, 33578 and 33579: 553 claims (170 in 2024, $18.4 million paid); Brandon ZIP 33510 and 33511: 215 claims (70 in 2024, $7.0 million paid); Sun City Center ZIP 33573: 50 claims (14 in 2024, $0.1 million paid).
Source: Federal Emergency Management Agency (OpenFEMA), accessed 2026-09-23
Hillsborough County's guidelines say volunteer labor and donated or discounted materials must be counted at normal market value in the substantial improvement cost, and that the building market value comes from the Property Appraiser's FEMA 50% figure or an actual cash value appraisal by a qualified independent appraiser.
Source: Hillsborough County, accessed 2026-09-23
Hillsborough County's published substantial damage and improvement guidelines still quote a county code definition of substantial improvement as any combination of work taking place during a twelve-month period whose cumulative cost equals or exceeds 50 percent of the building's market value.
Source: Hillsborough County, accessed 2026-09-23
FEMA's Substantial Improvement/Substantial Damage Desk Reference (FEMA P-758) says that for a pre-FIRM home in an A zone, a lateral addition that is not structurally connected (only a doorway cut into the common wall) and involves no other work must itself be elevated if it is a substantial improvement, but the original building need not be. In V zones, the compliance matrix requires both the addition and the existing building to comply even when the addition is not structurally connected.
Source: Federal Emergency Management Agency, accessed 2026-09-23
The 2020-2024 American Community Survey estimates Apollo Beach's median age at 41.4, with 17.9 percent of residents aged 65 or older and 21.7 percent aged 62 or older, compared with 15.0 percent aged 65 or older in Hillsborough County. Of its 12,819 housing units, 11.4 percent were built before 1980 and 69.5 percent in 2000 or later.
Source: U.S. Census Bureau, American Community Survey, accessed 2026-09-23
Unincorporated Hillsborough County's Land Development Code (Sec. 6.11.02) limits accessory dwelling living space to 900 square feet, requires a lot of at least 7,000 square feet and an owner-occupied principal home, allows attached or detached units, and allows one per lot. A variance to go larger is available only on lots of at least 14,520 square feet, and then to no more than 1,200 square feet or 25 percent of the main home's living space, whichever is less; living space includes storage and laundry.
Source: Hillsborough County (Municode), accessed 2026-09-23
Do you have an elevation certificate for the Apollo Beach house?
If you do, send it with the address. If not, it is the first document to get, and we will explain why it comes ahead of any drawing.
Apollo Beach and Hillsborough County's substantial improvement test
Apollo Beach is unincorporated, so the flood test is Hillsborough County's. The county counts volunteer labor and donated or discounted materials at full market value, so doing part of the work yourself does not lower the figure. It measures against the Property Appraiser's FEMA 50 percent value or an independent appraisal, and the appraisal is the lever if that value looks low. The county's guidance page still quotes a 12-month cumulative definition that state law has since barred local governments from enforcing, so ask the county how it counts recent work, storm repairs included. How the suite joins the house matters too: in an A zone, a lateral addition connected only by a doorway can keep the existing home out of the elevation requirement, which is not the case in a V zone. Seven in ten homes here were built in 2000 or later. A suite with its own kitchen is an ADU under county rules, capped at 900 square feet.
Suites and additions arranged in Apollo Beach, flood zone first
In-Law Suite Additions
Add a bedroom, a bathroom and a sitting room onto the house so a parent can live with you and still close a door of their own, planned so the kitchen decision does not turn it into a second dwelling by accident.
In-Law Suites in Apollo Beach →First-Floor Primary Suite Additions
Put a bedroom and a bathroom on the ground floor for someone who can no longer manage the stairs, without the addition pulling the whole house under current flood rules.
First-Floor Suites in Apollo Beach →Detached ADUs and Backyard Cottages
Put a small, separate home in the backyard for a parent, close enough to help and far enough for their own front door, under the rules that actually govern the lot.
Detached ADUs in Apollo Beach →Tell us how the Apollo Beach suite would attach
Through a doorway only, or opened into the house. That choice can change what the flood rule asks of the existing home, and we pass it to a licensed contractor as part of the brief.