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

Barndominium Builders in Jacksonville, FL

Duval County is the one market on our list where the acreage and city hall share the same government. The 1968 Jacksonville-Duval County Consolidation merged city and county into a single 874-square-mile jurisdiction, the largest total area of any city in the contiguous United States, which means the AGR-zoned rural acreage out past Cecil Field, Baldwin, and Whitehouse is permitted by the same Building Inspection Division, the same zoning code, and the same wind-speed ordinance as downtown. That ordinance is unusually precise for Florida: Duval sets two different design wind speeds on either side of a line drawn up the St. Johns River and I-95, rather than leaving builders to read a statewide contour map. Four small municipalities, Baldwin, Atlantic Beach, Neptune Beach, and Jacksonville Beach, never joined the consolidation and still run their own permitting today, so confirming jurisdiction against the parcel, not the mailing address, still matters here too.

Jacksonville at a glance

County
Duval County
Population
1,023,153
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Building conditions in Jacksonville

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 Jacksonville, Duval County: design wind speed 125–130 mph, outside the High Velocity Hurricane Zone. BUILD CONDITIONS JACKSONVILLE, FL Duval CountyOUTSIDE THE HVHZOUTSIDE WBDR * DESIGN WIND SPEED 125–130 mph125 mph across the western acreage belt, 130 east of the St. Johns lineZONING · AGR AGRICULTURAL2.5-acre minimum lot100 ft width · 35 ft height · 10% lot coveragePERMIT REVIEW CLOCK30 business daysF.S. 553.792 · fee drops 10% per day lateCOUNTY IMPACT FEENoneConsolidation eliminated the separate county-level feeWHO ISSUES THE PERMITCity of Jacksonville Building InspectionConsolidated city-county covers nearly all rural land * Wind-borne debris status is corroborated, not independently confirmed against the adopted map.
Build conditions for Jacksonville, drawn from the sourced facts on this page. Every figure above is cited in the quick-facts panel below, with its source and vintage.
Design wind speed: a codified line, not a guess
125 mph across western and southern Duval, the AGR/RR acreage belt around Cecil Field, Baldwin, Whitehouse, and Bayard, and 130 mph east of a line drawn up the middle of the St. Johns River to the Fuller Warren Bridge, then north along I-95. Risk Category III and IV structures run 135 to 140 mph on the same split. This is one of the only Florida wind maps we've found written directly into a county's own ordinance text rather than inferred from a statewide contour.

Duval County Ordinance Code § 320.103, last amended by Ordinance 2012-214-E, jacksonville.elaws.us. Do not use the older 2007 UF GeoPlan Duval wind speed map, which shows a different, superseded demarcation line and pre-2010-code values.

Who issues your permit
The City of Jacksonville Building Inspection Division, part of Planning and Development, handles essentially all of Duval County's rural and agricultural land, filed through the JaxEPICS online portal. There is no separate unincorporated-county building department the way Marion or Alachua have one, because the 1968 consolidation merged city and county government into a single office.

Building Inspection Division, Ed Ball Building, 214 N. Hogan St., 904-255-8500, BIDDocuments@coj.net. The exception is a parcel inside Baldwin, Atlantic Beach, Neptune Beach, or Jacksonville Beach, permitted by that municipality directly; confirm jurisdiction against the city GIS parcel lookup at maps.coj.net, not the mailing address.

Zoning: AGR, Agriculture District
2.5-acre minimum lot for a dwelling, 100 ft minimum width, 35 ft maximum height, and lot coverage capped at 10%. Density then scales with tract size: one unit per 2.5 acres under 40 acres, one per 10 acres from 40 to 159, one per 40 acres from 160 to 639, and one per 100 acres at 640 acres and up.

Jacksonville Zoning Code § 656.331(d)(2). A separate 'two acres' figure at § 656.401(g)(2)(i) applies only to churches seeking a use-by-exception across ten districts including AGR, not to AGR's general residential minimum; do not quote it as the district's lot size.

One government, one wind ordinance, one department
The 1968 Jacksonville-Duval County Consolidation merged city and county into a single 874-square-mile jurisdiction, the largest total area of any city in the contiguous United States. That is why real AGR-zoned rural acreage west of Cecil Field and south toward Julington Creek sits inside the same official city limits, the same permitting department, and the same wind ordinance as downtown, a combination we have not found anywhere else on our list.

City of Jacksonville consolidation history, Laws of Florida Ch. 67-1320; multiple secondary sources cross-checked. The 874 sq mi figure is the commonly cited total-area number; a land-only figure closer to 747 sq mi also appears in some sources.

Impact fees: no county layer at all
Consolidation appears to have eliminated the separate county-level impact fee entirely. There is no parks, school, or fire/EMS impact fee on a single-family home in Duval County; the only city charge is a zone-based Mobility Fee, roughly $3,922 in one cited estimate, plus JEA water and sewer capacity fees of $1,170 and $5,114.

Impact-fee aggregator sourcing, rates cited 5 August 2026. The Mobility Fee is zone-based across 10 mobility zones administered by CMMSO (904-255-8330); we confirm the actual zone rate for a specific parcel before quoting a number.

Sinkhole risk is genuinely low here
Duval sits on Atlantic Coastal Plain sand and clay, not the soluble Ocala limestone that drives subsidence risk in our central Florida markets. Secondary aggregation puts Duval's sinkhole incident count in the range of 11 to 72, depending on source and window, an order of magnitude below Marion's 483 or Hillsborough's 617.

Florida DEM/FGS Subsidence Incident Report database via secondary mapping aggregators.

Also worth knowing before you build in Jacksonville

Four cities that never consolidated
Baldwin, Atlantic Beach, Neptune Beach, and Jacksonville Beach voted against joining the 1968 consolidation and still run their own zoning, permitting, and flood rating today, about 6% of county population. None of the four is where the AGR acreage market is, but if a parcel falls inside one, this page's figures do not apply.

City of Jacksonville consolidation history; jurisdiction should be confirmed against the GIS parcel lookup, not the mailing address.

RR-Acre, the smaller-lot rural alternative
A 1-acre minimum lot, 100 ft width, 25% maximum lot coverage, and the same 35 ft height cap as AGR, for a buyer who wants acreage without full agricultural-use rights.

Jacksonville Zoning Code § 656.304.

No minimum living area found in AGR or RR-Acre
Consistent with the pattern in our other north Florida markets, Alachua and Marion, neither AGR nor RR-Acre sets a minimum dwelling square footage in the text we reviewed.

Jacksonville Zoning Code §§ 656.331, 656.304.

The agricultural exemption does not cover a dwelling
F.S. 604.50 exempts a bona fide nonresidential farm building, a barn, greenhouse, or storage building, from the building code and permit fees, never a residence. No Duval ordinance broadens this.

F.S. 604.50, applied statewide.

Ground conditions: high water table, not karst
Duval's rural AGR land sits on Atlantic Coastal Flatwoods soils, Leon, Pottsburg, Sapelo, Ridgeland, and Mandarin, typically poorly to somewhat-poorly drained with a seasonal high water table within about 18 inches of the surface. That is close to the opposite of Marion's excessively-drained Candler sand, and a site-specific geotechnical investigation with a raised or engineered foundation should be treated as the norm here, not the exception.

USDA NRCS Official Series Descriptions for the Leon, Pottsburg, Sapelo, Ridgeland, and Mandarin series.

Termite protection is mandatory
All of Florida is Termite Infestation Probability Zone 1, Very Heavy. Registered termiticide treatment plus a Certificate of Compliance is required on every new dwelling, no Duval-specific variation found.

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

Building permit fee
Set by formula under Ordinance Code § 320.409, with current dollar figures published at coj.net/fees rather than fixed in the ordinance text. The minimum residential permit fee is $95.00, effective June 2025.

Jacksonville Ordinance Code § 320.409 and § 106.112.

Rainfall
Approximately 53.5 inches of annual precipitation.

NOAA NCEI 1991-2020 Climate Normals, Jacksonville International Airport station (GHCND:USW00013889).

Measured hurricane wind, against the design number
Hurricane Irma (2017) brought sustained winds of 59 mph with an 86 mph gust at Jacksonville International Airport, and a sustained 68 mph with an 87 mph gust at the Mayport ASOS station. Hurricane Matthew (2016) brought 61 mph sustained with gusts to 76 mph at the Jacksonville Beach Pier, easing to 41 mph sustained inland at Craig Airport. Every measured gust we found stayed meaningfully below the 125-130 mph design wind speed.

NWS Jacksonville storm reporting for Irma and Matthew. Hurricanes Ian (2022) and Milton (2024) were primarily rain events for this county.

Flood insurance discount and claims history
City of Jacksonville, the consolidated jurisdiction covering essentially all AGR/RR rural land, holds a Community Rating System Class 6, a 20% NFIP premium discount inside the flood hazard area. Duval County has recorded roughly 6,060 NFIP flood claims totaling about $214 million paid since 1978, with 2017's Hurricane Irma the single highest claims year.

FEMA Community Rating System; FEMA/NFIP claims-history aggregation. The three independent beach municipalities carry separate ratings.

Population and permit activity
Duval County's population is approximately 1,023,153, the 6th most populous county in Florida, up 9.3% from 2019 to 2024. Building permits for all structure types ran 9,811 in 2023 and dropped to 6,495 in 2024, a real swing worth factoring into market timing.

U.S. Census Population Estimates Program, Vintage 2024; Census Building Permits Survey via FRED, series BPPRIV012031.

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 Duval 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 Jacksonville

Every service we offer is available across Duval 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 Jacksonville 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 Duval 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 Duval County. Tell us what you want to build and we will draw it to them.

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Where we build around Jacksonville

Duval 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 Jacksonville service area, covering Duval 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 Jacksonville 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 Jacksonville figures above. We would rather you checked them than took our word for it.

Nearby areas we build in

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

Gainesville

Alachua County
Palm Coast

Flagler County

Building in Jacksonville: common questions

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

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How much land do I need to build a barndominium in Duval County?
2.5 acres is the minimum lot for a dwelling in the AGR, Agriculture, district that covers most of western and southern Duval's rural land, with a 100 ft minimum width and a 35 ft maximum building height. Actual density scales with how much land you're working with: under 40 acres it's one dwelling per 2.5 acres, but the ratio drops to one per 10 acres between 40 and 159 acres, and further out to one per 100 acres past 640 acres. If you want acreage without full agricultural-use rights, RR-Acre allows a 1-acre minimum lot instead. We have not found a minimum living area written into either district's code.
Who issues my permit, the city or the county?
In Duval County they're the same office. The 1968 consolidation of Jacksonville and Duval County merged city and county government into one, so the City of Jacksonville Building Inspection Division handles essentially all of the county's rural and agricultural land, filed through the JaxEPICS portal, not a separate 'unincorporated county' department the way Marion or Alachua have. The one exception is Baldwin, Atlantic Beach, Neptune Beach, or Jacksonville Beach, four small municipalities that never joined the consolidation and still run their own permitting. We confirm jurisdiction against the city's GIS parcel lookup, not the mailing address, since none of the acreage market sits inside those four cities anyway.
What wind speed does my building have to be engineered to?
It depends which side of a specific line you're on, and Duval is unusual in spelling that line out in its own ordinance rather than leaving it to a statewide contour map. Jacksonville Ordinance Code § 320.103 sets 125 mph for a typical single-family home west of a line running up the middle of the St. Johns River to the Fuller Warren Bridge and then north along I-95, and 130 mph east of it. That means most of the AGR acreage belt around Cecil Field, Baldwin, and Whitehouse falls in the 125 mph zone, while the urban core and beaches sit at 130. We confirm the exact figure for your specific parcel with Building Inspection before an engineer stamps a design.
Do I need impact windows out on rural Duval acreage?
Probably not for most of the interior, based on Duval's wind-speed zoning. Duval's own § 320.103 sets wind speeds by zone but does not restate a wind-borne debris region boundary directly. Applying the statewide trigger, eastern Duval at 130 mph, which includes the actual coastline, falls inside the debris region, while western and interior Duval at 125 mph, with no coastline, falls outside it. We confirm directly with Building Inspection before telling a western-Duval client they're categorically exempt from impact-rated glazing.
What do the impact fees add up to?
Less than most Florida counties, as far as we can tell. Consolidation appears to have eliminated the separate county-level impact fee layer entirely, so there's no parks, school, or fire/EMS impact fee on a single-family home in Duval. What you do pay is a zone-based City of Jacksonville Mobility Fee, roughly $3,922 in one cited estimate but genuinely variable across the city's 10 mobility zones, plus JEA's water and sewer capacity fees of $1,170 and $5,114. That puts a rough total near $10,200, but we pull the current zone-specific Mobility Fee from CMMSO before quoting an exact number for a specific parcel.
Is there really working rural land inside Jacksonville city limits?
Yes, and it's the most distinctive thing about building here. The 1968 consolidation merged Jacksonville and Duval County into one government covering 874 square miles, the largest total area of any city in the contiguous United States. That is why AGR-zoned acreage out past Cecil Field, Baldwin, and Whitehouse, and down near the St. Johns County line, sits inside the official limits of a top-15 U.S. city, a few miles from an international airport and a metro of over a million people, permitted by the same department and the same wind ordinance as downtown. We have not found that combination, job-access population center plus consolidated-government farmland, anywhere else on our list.
What's the ground like on rural Duval acreage?
Wetter than you'd expect, and that's the main site-condition issue here rather than sinkholes. The soils that recur across Duval's AGR-zoned land, Leon, Pottsburg, Sapelo, Ridgeland, and Mandarin, are Atlantic Coastal Flatwoods soils, typically poorly to somewhat-poorly drained with a seasonal high water table within about 18 inches of the surface. That is close to the opposite of Marion County's excessively-drained Candler sand. We treat a site-specific geotechnical investigation and likely a raised or engineered foundation as the norm on Duval acreage, not the exception.
Should I be worried about sinkholes?
Less than in our central Florida markets. Duval sits on Atlantic Coastal Plain sand and clay, not the soluble Ocala limestone that drives subsidence risk in Marion, Citrus, or Hillsborough. Secondary sinkhole-report aggregation puts Duval's incident count somewhere between 11 and 72 depending on the source and time window, an order of magnitude below Marion's 483. For Duval, high water table and poor drainage, not subsidence, is the real site-condition issue.
Can I build the shop or barn before the house?
Section 656.403 of the zoning code defines what counts as an accessory structure but does not address build order the way Palm Bay's and Alachua's codes explicitly do. Given how often this question comes up for a rural-acreage buyer, we confirm build-sequencing directly with the Building Inspection Division as part of site planning, before finalizing which structure goes up first.
What will my building permit actually cost?
Jacksonville Ordinance Code § 320.409 sets permit fees by formula, tiered by square footage for new construction, with current dollar figures published separately at coj.net/fees rather than fixed in the ordinance text. The minimum residential permit fee is $95.00, effective June 2025. We pull the live schedule before quoting an exact number to a client.

Building in Jacksonville?

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

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