A NE Florida home addition follows similar code requirements across Clay, Duval, and St. Johns counties — they all use the Florida Building Code as the base — but the administrative process, fee structure, and review timing differ meaningfully. Knowing which applies to your address can save 4 to 8 weeks of total project time.
Clay County process
Clay County uses the Tyler Technologies EPL system at the Citizens Access Portal (CAP).
Permit fee structure: $1 per $1,000 of construction value plus $50 application fee. A $200,000 addition pays roughly $250 in building permit fees.
Plan review timeline: 4 to 8 weeks for a standard addition.
Impact fees: Apply to conditioned square footage added. Typical 600 sqft addition: $4,000 to $8,000 in school, transportation, and parks impact fees.
HOA review: Most Fleming Island, Eagle Harbor, Pace Island, and Margaret's Walk subdivisions require ARB approval in parallel with county. Submit both at once.
Inspections: 12 to 18 inspections across all trades for a typical addition.
Notice of Commencement: Required for any permit over $5,000. Recorded at the Clay County Courthouse.
Total permit timeline: 8 to 14 weeks from contract to permit-in-hand for a standard addition (parallel to material lead times so doesn't necessarily extend total project elapsed time).
City of Jacksonville (Duval County) process
City of Jacksonville permits go through their online portal at the Edward Ball Building (214 N Hogan St).
Permit fee structure: Value-based combined fee schedule. A $200,000 addition typically pays $1,200 to $2,500 in combined building, mechanical, electrical, and plumbing permit fees.
Plan review timeline: 5 to 9 weeks for a standard addition. Historic district properties (Riverside, Avondale, Springfield, Murray Hill) add 4 to 8 weeks.
Impact fees: Apply to additions adding conditioned square footage. Vary by district (school zone, mobility, etc.). Typical 600 sqft addition: $5,000 to $12,000.
HOA review: Less common than in Clay County subdivisions; varies by neighborhood.
Inspections: 12 to 18 inspections similar to Clay County.
Notice of Commencement: Recorded at the Duval County Clerk's office.
Total permit timeline: 10 to 16 weeks for a standard addition; 14 to 24 weeks for historic district properties.
St. Johns County process
St. Johns County issues addition permits through the Building Services Division.
Permit fee structure: Value-based fee schedule. Similar to Duval but with additional CCCL (Coastal Construction Control Line) fees east of the line.
Plan review timeline: 5 to 8 weeks for a standard addition. CCCL properties (east of A1A in Ponte Vedra, east of US-1 in St. Augustine) add 4 to 6 weeks for additional state-level review.
Impact fees: Apply to conditioned square footage. Typical 600 sqft addition: $5,000 to $10,000.
HARB review (St. Augustine historic): Mandatory for any property in the historic core. Adds 4 to 8 weeks.
HOA review: Common in Sawgrass, Marsh Landing, TPC Sawgrass, Ponte Vedra Beach. Submit in parallel with county.
FEMA flood elevation certificates: Required for properties in FEMA flood zones (most of east-of-A1A and east-of-US-1 areas).
Total permit timeline: 10 to 16 weeks standard; 14 to 24 weeks with CCCL or HARB review.
Side-by-side comparison
| Factor | Clay County | City of Jacksonville | St. Johns County | |---|---|---|---| | Submission portal | Tyler EPL | City of Jax BID | St. Johns Building Services | | Permit fee on $200K addition | ~$250 | $1,200–$2,500 | $1,500–$3,000 | | Standard plan review | 4–8 weeks | 5–9 weeks | 5–8 weeks | | Impact fee on 600 sqft | $4–8K | $5–12K | $5–10K | | HOA parallel review | Common (Fleming Island, Eagle Harbor) | Less common | Common (Ponte Vedra, Sawgrass) | | Historic review | Rare | Common (Riverside, Avondale, Springfield, Murray Hill) | Mandatory in St. Augustine core | | CCCL review | N/A | N/A | Required east of A1A / US-1 | | FEMA flood cert | Some areas | Some coastal/river areas | Most east-of-A1A areas |
Three things that consistently slow the process
Across all three counties, three issues consistently extend addition permit timelines:
1. HOA review running serially after county approval. ARBs typically take 30 to 60 days. Submitting after county approval doubles the elapsed time. Submit in parallel.
2. Engineering re-submission cycles. Plans returned for missing structural details add 1 to 2 weeks per cycle. The fix is a contractor whose engineer knows the local reviewers' preferences and submits clean drawings the first time.
3. CCCL review for coastal St. Johns properties. Florida DEP review of structures east of the Coastal Construction Control Line adds 4 to 6 weeks beyond county review. Plan for it explicitly; can't be expedited.
What the impact fees actually cover
Impact fees fund infrastructure that the new conditioned square footage will use. By district:
- School impact fees. Funds school capacity expansion. Typically the largest single component.
- Transportation impact fees. Funds roadway capacity and signal infrastructure.
- Parks impact fees. Funds parks and recreation capacity.
- Mobility fees (some districts). Funds transit and pedestrian infrastructure.
- Fire and EMS impact fees (some districts). Funds emergency service capacity.
Combined, these add $4,000 to $12,000 for a typical 600 sqft addition across NE Florida counties. Verify the specific fee schedule for your address before scope.
Permit-pulling: contractor vs. owner-builder
Florida law allows a homeowner to pull addition permits as an owner-builder on their primary residence. Three reasons most homeowners shouldn't:
1. Lien protection. The Notice of Commencement filed by a licensed contractor includes the contractor's information; owner-builder permits put the homeowner directly in the lien chain.
2. Insurance and warranty implications. Owner-builder status voids most appliance and product warranties (which require licensed installation), and homeowner's insurance may not cover defects.
3. Code knowledge and re-submission risk. A licensed CGC submits clean drawings the first time. Owner-builders typically go through 2 to 4 re-submission cycles before approval, adding 4 to 12 weeks.
The right approach is to hire a Florida-licensed CGC who pulls the permits in-house as part of the project.
Related reading
- Home Addition Cost & Permits in Clay County, FL — full guide
- Home Addition Cost Per Square Foot in Jacksonville, FL — pricing piece
- Home Additions — Tivey Construction — what's included in a Tivey-led addition
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