A finished barndominium at dusk with warm interior lighting glowing through its large windows.
Hillsborough County Outside the HVHZ

Barndominium Builders in Tampa, FL

Hillsborough County has more Florida Geological Survey sinkhole reports than any other county in the state, but the number that actually matters happened in January 2010, when growers running well pumps overnight to protect crops from an 11-day freeze pulled groundwater fast enough to open 140 sinkholes around Dover and Plant City, the same rural belt of eastern Hillsborough where barndominium-suitable acreage sits, causing roughly $8 million in real property damage and prompting the water district to create a 259-square-mile water use caution area in response. Zoning here runs AS-1 (1-acre minimum) and AR (5-acre minimum) with a 50-foot height cap, and 84% of the county is unincorporated, so nearly every acreage build goes through Hillsborough County Development Services rather than the City of Tampa. Hurricane Milton passed close enough in October 2024 to register a 93 mph gust at Tampa International and 105 mph offshore at Egmont Channel, a real, measured reminder of storm exposure even on a near-miss. Every structure we build in Hillsborough County is engineered to the currently adopted ultimate design wind speed under FBC 8th Edition (2023)/ASCE 7-22, confirmed for your specific parcel with Hillsborough County Development Services (813-272-5600) before a Florida-licensed engineer stamps the final structural drawings.

Tampa at a glance

County
Hillsborough County
Population
1,574,115
Start your project

Building conditions in Tampa

What actually changes from one Florida city to the next: who issues the permit, what wind speed the structure has to be engineered to, and what the ground is like. These are the numbers your drawings have to satisfy.

Build conditions for Tampa, Hillsborough County: design wind speed Confirmed per parcel, outside the High Velocity Hurricane Zone. BUILD CONDITIONS TAMPA, FL Hillsborough CountyOUTSIDE THE HVHZOUTSIDE WBDR * DESIGN WIND SPEED Confirmed per parcelAdopted Vult under FBC 8th Edition and ASCE 7-22 — confirmed per parcel before plans are sealedZONING · AS-1 / AR AGRICULTURAL1-acre minimum (AS-1)Agricultural Rural at 5 acres · both cap height at 50 ftPERMIT REVIEW CLOCK30 business daysF.S. 553.792 · fee drops 10% per day lateWHO ISSUES THE PERMITHillsborough County Development ServicesUnincorporated land, where the acreage overwhelmingly sits * Wind-borne debris status is corroborated, not independently confirmed against the adopted map.
Build conditions for Tampa, drawn from the sourced facts on this page. Every figure above is cited in the quick-facts panel below, with its source and vintage.
The Dover/Plant City freeze-pumping sinkhole outbreak
During an 11-day freeze in January 2010, area growers running well pumps for overnight frost protection withdrew groundwater at a rate approaching one billion gallons per day, dropping Floridan Aquifer levels roughly 55 feet and drying up more than 750 wells. 140 sinkholes opened in the Dover/Plant City area of eastern Hillsborough over those same days, about $8 million in property damage to homes, roads, and farmland. The district's response was a new 259-square-mile water use caution area and revised freeze-pumping rules, real regulatory evidence this was treated as a genuine hazard, not a rounding error.

Southwest Florida Water Management District public reporting on the 2010 freeze response (waterMatters.org); Peterson & Rumbaugh (2012) SWFWMD technical study. A secondary account cites 60 feet.

Zoning: AS-1 and AR, unincorporated Hillsborough
Agricultural, Single-Family (AS-1) sets a 1-acre minimum lot; Agricultural Rural (AR) sets a 5-acre minimum. Both cap building height at 50 feet. A general county rule adds 2 extra feet of setback for every foot of height over 20 feet, worth knowing before sizing a tall shop or barn.

Hillsborough County Land Development Code, Article VI § 6.01.01, Schedule of District Area, Height, Bulk and Placement Regulations, per the hillsboroughcounty-fl.elaws.us mirror.

Who issues your permit
Hillsborough County Development Services (813-272-5600) for unincorporated land, where barndominium-suitable acreage overwhelmingly sits — Dover, Plant City, Balm, Wimauma, Lithia, and the Sun City Center area. City of Tampa Construction Services (813-274-3100) only inside city limits. Roughly 84% of the county's land area, an estimated 909 of about 1,072 square miles, is unincorporated.

Hillsborough County Development Services; City of Tampa Construction Services. The 84% unincorporated figure is calculated from Census Gazetteer land-area data.

Impact fees, unincorporated Hillsborough
Four separate charges apply: a Mobility fee (varies by benefit zone), a Parks impact fee, a School impact fee, and a Fire service impact fee. The School fee runs $1,645 for a home under 900 sq ft up to $8,227 for 1,800–2,499 sq ft. Qualifying affordable-housing construction can get 100% relief on mobility, parks, and fire fees.

Hillsborough County School Impact Fee schedule hosted on tampa.gov, dated 'updated 6/5/2020.' The county has since adopted an updated fee schedule effective 10/1/22, with a further update (Resolution RS25-111) expected around March 2026. We confirm the current mobility, parks, school, and fire impact fee amounts directly with impactfees@hcfl.gov or (813) 276-8305 before finalizing a quote.

Hurricane Milton's measured winds in Tampa Bay
Milton made a fairly direct approach to Tampa Bay in October 2024, landfalling near Siesta Key as a Category 3. Tampa International Airport measured 58 mph sustained wind with a 93 mph gust; the Tampa Skyway Fishing Pier recorded a 103 mph gust; the Egmont Channel platform at the mouth of the bay recorded 105 mph, the highest reading in the immediate area. Even on a fairly direct approach, Tampa itself sat on the weaker side of the circulation — the storm's highest measured sustained wind over land, 78 mph, was recorded well south at Venice.

Press-reported station figures from National Hurricane Center and NWS Tampa Bay post-storm reporting on Hurricane Milton (AL142024).

The Seffner sinkhole fatality
On February 28, 2013, a sinkhole opened beneath a bedroom in a private home in Seffner, unincorporated Hillsborough County, while 37-year-old Jeffrey Bush was asleep. He was never recovered and is officially presumed deceased. It remains Florida's best-known sinkhole fatality.

Hillsborough County Sheriff's Office and multiple contemporaneous news reports, February 2013.

Also worth knowing before you build in Tampa

Highest sinkhole report count of any Florida county
Hillsborough has 617 Florida Geological Survey Subsidence Incident Report filings on record, more than any of Florida's other 66 counties, ahead of Marion (483), Citrus (449), Pasco (344) and Polk (304). Raw report counts include a large share that are never field-verified as actual sinkholes by a licensed geologist — Polk's own count, for comparison, saw only 6 of 304 reports field-verified — and no Hillsborough-specific verification rate was found, so this figure is context for the Dover/Plant City and Seffner cases above, not a standalone claim about confirmed sinkhole density.

Florida Geological Survey / Florida Division of Emergency Management Subsidence Incident Report database.

The 2006–2010 sinkhole insurance claims spike, with an honest caveat
Hillsborough was one of three 'Sinkhole Alley' counties, with Hernando and Pasco, that together accounted for roughly two-thirds of Florida's sinkhole insurance claims from 2006–2010; Hillsborough's own claims rose from 312 in 2006 to 1,305 in 2009, and Citizens Property Insurance's claim frequency here rose 384% over the period. The Florida Senate's own 2011 interim report found 'no geological explanation' for the full size of that spike — claims-handling behavior, not just ground conditions, drove much of the increase, which is why we lean on the Dover/Plant City and Seffner cases as the real evidence rather than this claims trend.

Florida Senate Banking and Insurance Committee, Interim Report 2011-104, 'Issues Relating to Sinkhole Insurance'; Florida Office of Insurance Regulation, November 2010 Report on Review of the 2010 Sinkhole Data Call.

Design wind speed
Every structure we build in Hillsborough County is engineered to the currently adopted ultimate design wind speed (Vult) under FBC 8th Edition (2023)/ASCE 7-22 Figure 1609.3(1), Risk Category II. We confirm the exact figure for your specific parcel with Hillsborough County Development Services (813-272-5600) before a Florida-licensed engineer stamps the final structural drawings — standard practice on every build, coastal or inland.

Hillsborough County Development Services, (813) 272-5600; the 2023 code edition did not raise wind speeds anywhere on the Florida peninsula, only in the panhandle, per the Florida Building Commission's own fact sheet.

Outside the HVHZ; wind-borne debris region confirmed per parcel
Only Miami-Dade and Broward counties are the High-Velocity Hurricane Zone — Hillsborough is not among them. Whether a given parcel falls in the wind-borne debris region depends on the adopted design wind speed and, in the lower range of that band, on distance from Tampa Bay's mean high-water line (relevant for parts of South Tampa, Apollo Beach, Gibsonton, Ruskin, and Progress Village), not the inland rural acreage this company mostly builds on. We confirm WBDR status for your specific parcel on the same call that confirms the adopted wind speed.

FBC Section 202 definitions (HVHZ); FBC §1609.2/§1609.1.2 (WBDR triggers), confirmed per parcel with Hillsborough County Development Services.

The agricultural exemption does not cover a dwelling
F.S. 604.50 exempts a bona fide nonresidential farm building, barn, greenhouse, shade house, or storage building from the Florida Building Code and from county permit fees, except where floodplain rules apply, but it explicitly excludes any structure intended as a residential dwelling. No Hillsborough-specific ordinance broadens this for a residential barndominium.

F.S. 604.50; parallel exemption at F.S. 553.73(10)(c).

Ground conditions: karst limestone, and former mining land in the east
Hillsborough sits over the same Suwannee Limestone / Floridan Aquifer System karst responsible for the county's sinkhole record. Eastern Hillsborough also contains former phosphate-mining land, where roughly a century of mining removed overburden and erased the natural surface depressions that sinkhole-favorability models rely on — the same Arents/mine-reclamation soil pattern documented in western Polk County.

Florida Geological Survey statewide favorability report, quoted for the eastern Hillsborough under-prediction caveat.

Termite protection is mandatory
All of Florida is Termite Infestation Probability Zone 1, Very Heavy. Registered termiticide treatment plus a Certificate of Compliance from an FDACS-licensed pest control company is required on every new dwelling regardless of framing material; no Hillsborough-specific variation was found.

Florida Building Code Residential R318.1 (8th Edition, 2023); HUD TIP Zone map.

Permit review deadline and private-provider route
A single-family permit under 7,500 sq ft gets a 30-business-day plan review, with the jurisdiction owing a 10%-per-late-day fee reduction if it misses that window; the private-provider route under F.S. 553.791 is also available. Both apply in Hillsborough exactly as they do statewide — no local extension and no published private-provider fee discount (comparable to Gainesville's 75% or Palm Bay's flat $250/$250) were found.

F.S. 553.792 and F.S. 553.791. Confirm with Hillsborough County Development Services whether a local private-provider discount exists.

Building permit fee
Unincorporated Hillsborough charges a $50 application fee, with the remainder split 50% plan review / 50% inspection, calculated by occupancy classification, square footage, and valuation of work per trade.

Hillsborough County residential fee schedule (hcfl.gov). We confirm the current per-$1,000-valuation rate directly with Development Services before finalizing a quote.

Flood insurance discount
Unincorporated Hillsborough County holds a Community Rating System Class 5, a 25% NFIP premium discount, retained per FEMA's notice to the county in October 2023 and worth roughly $5.9 million a year in aggregate discounted premiums countywide. The county has participated in the NFIP since 1980 and in CRS since 1992. City of Tampa is also reported at Class 5 by one secondary source only.

FEMA Community Rating System; Hillsborough County program materials. The City of Tampa is rated Class 5 (25% discount in the Special Flood Hazard Area, 10% outside it); we confirm both classes against the current FEMA CRS Eligible Communities list before finalizing insurance estimates for a client.

Population and building activity
Hillsborough County's population is approximately 1,574,115. New building permits across all structure types fell from 17,444 in 2022 to 9,053 in 2024, roughly a 48% drop in two years — part of a regional cooling trend also documented in Polk County, not a Hillsborough-specific weakness.

U.S. Census Bureau QuickFacts, Vintage 2025 population estimates. Building permit figures: Census Building Permits Survey via FRED series BPPRIV012057.

An excavator grading a compacted building pad on a cleared lot, with survey stakes and a drainage swale visible.
Below the slab

The expensive surprises are in the ground, not the building

Most of Hillsborough County rates poorly for dwellings in the soil survey, and the reason is water sitting close to the surface rather than weak ground. That makes the pad elevation and the drainage plan the two line items most likely to move your budget. We price the dirt before we price the building.

What we build in Tampa

Every service we offer is available across Hillsborough County, from a shell kit you erect yourself to a finished home we hand you the keys to. What a build costs depends far more on the parcel than on square footage, so we price against your land rather than publishing a rate card.

See all nine services

What a build looks like

Three stages every Tampa project passes through, from a raw parcel to a finished home. Site work first, because that is where the budget is decided.

Aerial view of an undeveloped rural Florida lot with cleared grass, pine scrub and a sandy access track.
Stage one

The parcel

Zoning, setbacks, flood zone and utility access get checked before anything is drawn.

An excavator grading a compacted building pad on a cleared lot, with survey stakes and a drainage swale visible.
Stage two

Pad and permit

Clearing, grading and a compacted pad, while the submittal works through Hillsborough County.

A finished barndominium at dusk with warm interior lighting glowing through its large windows.
Stage three

Frame to finish

Shell erected and dried in, then systems, insulation and interior finish through to CO.

Those are the rules for Hillsborough County. Tell us what you want to build and we will draw it to them.

Start your project

Where we build around Tampa

Hillsborough County and the rural land around it. The buildable acreage for a project this size usually sits outside the city limits, which is frequently what changes who issues your permit.

Our Tampa service area, covering Hillsborough County and the surrounding rural acreage. We build across this area from our office in Lake Mary, FL — this map marks the territory we serve, not a branch location.

Keep reading

The questions that usually come next once you know what Tampa allows.

Barndominium Cost Guide

Sourced per-square-foot ranges by tier and by size, with a calculator built on the same figures.

Read it

Is It Legal in Florida?

Classification, zoning, the HOA gate, and the agricultural exemption that does not cover a home.

Read it

How Long Does It Take?

Census build-duration data, and the Florida statute capping permit review at 30 business days.

Read it

Sources for this page

The primary documents behind the Tampa figures above. We would rather you checked them than took our word for it.

Nearby areas we build in

Close to Tampa, though the permitting authority and wind requirements can differ once you cross a county line.

St. Petersburg

Pinellas County
Clearwater

Pinellas County
Lakeland

Polk County

Building in Tampa: common questions

11 questions we get asked most often about building in Tampa. If yours is not on the list, ask it directly.

Start your project
Is Hillsborough really the highest sinkhole county in Florida, and should that worry me?
By raw report count, yes: Hillsborough has 617 Florida Geological Survey Subsidence Incident Report filings, more than any of the state's other 66 counties, ahead of Marion (483), Citrus (449), Pasco (344), and Polk (304). But a raw report count is the weak version of that story, most SIR filings are self-reported and never field-verified by a licensed geologist, and we have not found a Hillsborough-specific verification rate to quote either way. What actually documents real risk here is the January 2010 Dover/Plant City freeze-pumping event, which opened 140 sinkholes with a clear mechanism and a real regulatory response, and the 2013 Seffner fatality, both of which we treat as the anchor evidence rather than the 617 figure alone.
What actually happened in the Dover/Plant City sinkhole outbreak?
During an 11-day freeze in January 2010, with nine of those nights below 34°F, strawberry, citrus, blueberry, and nursery growers across eastern Hillsborough ran well pumps overnight for frost protection, at one point withdrawing groundwater at a rate approaching one billion gallons a day. Floridan Aquifer levels in the affected area dropped roughly 55 feet, more than 750 wells went dry, and 140 sinkholes opened around Dover and Plant City, causing about $8 million in damage to homes, roads, and farmland. The Southwest Florida Water Management District's response was to create a new 259-square-mile Dover/Plant City Water Use Caution Area and rewrite its freeze-protection pumping rules specifically because of this event — that regulatory response is itself evidence this was treated as a real hazard. It is also the same rural belt of eastern Hillsborough, Dover, Plant City, Balm, Wimauma, Lithia, where barndominium-suitable acreage actually sits, which is why we take it seriously on every site visit rather than treating it as historical trivia.
What wind speed does my building have to be engineered to?
Every structure we build in Hillsborough County is engineered to the currently adopted ultimate design wind speed under FBC 8th Edition (2023)/ASCE 7-22 Figure 1609.3(1), Risk Category II. We confirm the exact figure for your specific parcel with Hillsborough County Development Services, (813) 272-5600, before any engineer stamps a structural design — standard practice on every build we do, regardless of location. That same call also settles whether your parcel falls in the wind-borne debris region, which depends on the exact figure and, in the lower part of that range, on distance from the Tampa Bay shoreline.
How much land do I need, and what zoning applies?
It depends on which agricultural district your parcel sits in. AS-1, Agricultural Single-Family, sets a 1-acre minimum lot, while AR, Agricultural Rural, requires 5 acres; both cap building height at 50 feet. There's also a general county rule worth knowing if you're planning a tall shop or barn: any structure taller than 20 feet has to add 2 extra feet of setback for every foot of height above that. We verify the specific front, side, and rear setback numbers and any accessory-structure size limits against the county's Land Development Code before finalizing a site plan.
Who issues my permit, the city or the county?
Almost certainly the county. Hillsborough County Development Services, (813) 272-5600, handles unincorporated land, and that's where the overwhelming majority of barndominium-suitable acreage sits, roughly 84% of the county's total land area is unincorporated, concentrated in the eastern and southern county around Dover, Plant City, Balm, Wimauma, Lithia, and Sun City Center. City of Tampa Construction Services, (813) 274-3100, only handles parcels inside city limits. Don't assume based on your mailing address, a property can carry a 'Tampa, FL' address while sitting entirely in unincorporated county, so we confirm jurisdiction through the county's HillsGovHub portal rather than the envelope.
What do the impact fees add up to?
There are four separate charges in unincorporated Hillsborough: a Mobility fee that varies by benefit zone, a Parks impact fee, a School impact fee, and a Fire service impact fee. The School fee is the one we have a real published table for, it runs from $1,645 for a home under 900 square feet up to $8,227 for 1,800 to 2,499 square feet, though that table is dated 2020 and the 2,500-plus tier wasn't published. We have seen secondary estimates putting combined impact fees for a new single-family home anywhere from $10,000 to $25,000-plus, but we do not quote that range as reliable, we pull the current schedule from the county's Mobility & Impact Fee Calculator or call impactfees@hcfl.gov, (813) 276-8305, before pricing a project, especially since the county has referenced a newer schedule that may take effect around March 2026.
Should I be worried about Hurricane Milton-level storms?
Milton made a fairly direct approach to Tampa Bay in October 2024, landfalling near Siesta Key as a Category 3, and it's a useful real-world data point rather than a worst case. Tampa International Airport measured 58 mph sustained wind with a 93 mph gust, the Skyway Fishing Pier recorded a 103 mph gust, and an offshore platform at Egmont Channel recorded 105 mph, the highest reading in the immediate area. Even on a fairly direct hit, Tampa sat on the weaker side of the circulation, the storm's highest measured sustained wind anywhere over land was 78 mph, well south at Venice. We build to the county's design wind speed regardless of any single storm's numbers, but Milton is a genuine, measured example of what a real storm looked like here, not a hypothetical.
Can I use the agricultural exemption to skip permitting on my barn?
For a genuine barn, greenhouse, shade house, or storage building on bona fide agricultural land, yes, F.S. 604.50 exempts it from the Florida Building Code and from county permit fees, except where floodplain rules apply. The moment that structure includes a kitchen, bedroom, or is otherwise intended as a residence, the exemption is gone and full residential permitting applies. We have not found any Hillsborough-specific ordinance that broadens this exemption for a barndominium, so plan on the dwelling portion of your build going through standard permitting no matter how agricultural the rest of the property is.
What's the ground like around Tampa?
Hillsborough sits over the same Suwannee Limestone and Floridan Aquifer System karst that's responsible for the county's sinkhole history, so a site-specific geotechnical report is something we treat as necessary, not optional. Eastern Hillsborough also has a phosphate-mining history, and state geologists have specifically called out eastern Hillsborough, by name, as an area where a century of mining removed overburden and erased the natural surface depressions that sinkhole-risk models rely on, meaning standard favorability maps can under-predict activity here. We treat every parcel individually with a site-specific geotechnical evaluation rather than assuming a single soil profile applies countywide.
Do I need impact windows here?
It depends on your parcel's exact location and the county's currently adopted design wind speed. Whether a given site falls in the wind-borne debris region depends on that adopted figure and, in the lower part of the qualifying range, on how close the land sits to the Tampa Bay shoreline, within one mile would likely trigger it, further inland likely would not. Tampa is outside the High-Velocity Hurricane Zone, which only covers Miami-Dade and Broward, so this isn't an automatic requirement the way it would be there. We confirm both the adopted wind speed and your parcel's wind-borne debris region status with Hillsborough County Development Services before finalizing window specs on your design.
What about flood insurance discounts?
If your land is in unincorporated Hillsborough, likely yes. The county holds a Community Rating System Class 5, which is a 25% discount on NFIP flood insurance premiums, a rating FEMA confirmed it would retain in October 2023, worth an estimated $5.9 million a year in aggregate savings countywide. The county has participated in the NFIP since 1980 and in CRS since 1992. If you're inside Tampa city limits instead, the city is also rated Class 5, so we verify your specific jurisdiction's current class against FEMA's official CRS Eligible Communities list before a client budgets around it.

Building in Tampa?

Start with the plan. Tell us what you want to build and we will draw it, then confirm what Hillsborough County will actually let you put on the parcel and what wind load it has to meet. That conversation costs nothing.

Start your project