Florida Building Codes, Permits and Contractor Rules
Here’s every rule from our 50-state guides for Florida on one page: the residential building code, frost depth, retaining wall permits, the 811 dig law, drainage law, contractor licensing, deposit limits, mechanics lien deadlines, workers’ comp, planting zones and frost dates. Each section links the official source and the full 50-state comparison.
Florida at a glance
- Building code: 2021 IRC (statewide)
- Frost depth: 12 in. minimum footing depth below finished grade (FBC-Residential R403.1.4); no frost depth
- 811 notice: At least 2 full business days before excavating (10 full business days for work beneath state waters)
- Contractors: State license required
- Deposits: No cap; >10% triggers start deadlines
- Liens: 90 days from final furnishing
- Workers’ comp: 4+ (construction: 1+)
- Drainage rule: Reasonable use
- Planting zones: 8b to 11b
| Topic | Florida | Compare |
|---|---|---|
| Residential building code | 2021 IRC (statewide) | All states |
| Frost line depth | 12 in. minimum footing depth below finished grade (FBC-Residential R403.1.4); no frost depth | All states |
| Retaining wall permit | No statewide height exemption: the Florida Building Code's permit-exemption list, as published by Miami-Dade and Lake County, doesn't include retaining walls. | All states |
| 811 notice before digging | At least 2 full business days before excavating (10 full business days for work beneath state waters) | All states |
| Contractor license | State license required | All states |
| Deposit limit | No cap; >10% triggers start deadlines | All states |
| Right to cancel | 3 business days, sales made at home | All states |
| Lien filing deadline | 90 days from final furnishing | All states |
| Workers’ comp required | 4+ (construction: 1+) | All states |
| Drainage between neighbors | Reasonable use | All states |
| Planting zones (2023 USDA) | 8b to 11b | All states |
| Frost dates (NOAA) | Last frost late Jan (Orlando) to mid-Mar (Tallahassee); first frost late Nov (Tallahassee) to early Jan of the new year (Orlando); no freeze in a typical year at the Miami airport station | All states |
Florida residential building code
- Code
- Florida Building Code, Residential, 8th Edition (2023), based on the 2021 International Residential Code
- How it applies
- Statewide, mandatory everywhere
- In effect since
- December 31, 2023
- Coming next
- Florida Building Code, Residential, 9th Edition (2026), based on the 2024 IRC, scheduled to take effect December 31, 2026 (final rule adoption was still pending in the Commission's October 2026 workplan)
- Code agency
- Florida Building Commission (Department of Business and Professional Regulation)
- Who enforces it
- Enforced by county and city building departments. Local governments may adopt stricter technical amendments only after a hearing showing local need.
- Good to know
- Florida has one statewide building code with its own residential volume, currently based on the 2021 IRC. A new 9th Edition based on the 2024 IRC is scheduled to take effect December 31, 2026, so ask your building department which edition applies to your permit.
Compare building codes in all 50 states
Frost line depth in Florida
- Who sets it
- State code
- Statewide value
- 12 in. minimum footing depth below finished grade (FBC-Residential R403.1.4); no frost depth
- Good to know
- The 12 in. figure is the Florida Building Code's general minimum footing depth (R403.1.4, 2017 6th Edition), not a frost depth. Confirm it with your building department under the current edition.
Frost line depth in every state
Retaining wall permits in Florida
- Permit exemption
- No statewide height exemption: the Florida Building Code's permit-exemption list, as published by Miami-Dade and Lake County, doesn't include retaining walls. Since July 1, 2026 (HB 803, ch. 2026-63), a wall that spans several single-family, two-family or townhouse lots gets one permit for the whole project, and the new $7,500 single-family exemption doesn't apply to structural work.
- Who decides
- Your county or city building department decides.
- Good to know
- Florida's 9th Edition building code (2026) is pending, and the 8th Edition is still current. Check with your county or city building department before you build.
Retaining wall permit rules in every state
811 dig law in Florida
- One-call center
- Sunshine 811
- Notice before digging
- At least 2 full business days before excavating (10 full business days for work beneath state waters)
- Ticket good for
- 30 calendar days after notice is given
- Hand-dig zone
- 24 in. from each facility's outside edges
- Homeowners
- Partial exemption: the owner of a single-family residential property (not being subdivided) may dig without notice only up to 10 in. deep, with due care and no encroachment on a utility right-of-way or easement. Deeper digging requires a call. Normal agricultural activities off marked rights-of-way are also exempt.
- The law
- Fla. Stat. ch. 556 (§ 556.101 et seq.)
- Good to know
- The homeowner exemption stops at 10 in. deep; dig deeper and you need to call.
Drainage law and stormwater permits in Florida
- Rule
- Reasonable use
- The rule
- Reasonable use: when a landowner improves land and surface water damages a neighbor, the reasonableness of each party's conduct is weighed.
- Leading case
- Westland Skating Center, Inc. v. Gus Machado Buick, Inc.. 542 So. 2d 959 (Fla. 1989)
- What it means for your yard
- You can regrade or build, but if the change sends water onto a neighbor, a court will weigh whether your conduct (and theirs) was reasonable; unreasonable changes can make you liable.
- Construction stormwater permit
- Florida Department of Environmental Protection (DEP), NPDES Stormwater Program: 1 or more acres of disturbance, or less than 1 acre if part of a common plan of development or sale, discharging to surface waters or an MS4 (Construction Generic Permit, DEP Document 62-621.300(4)(a))
- State rules below 1 acre
- No statewide rule below the 1-acre permit found; check your county and town.
- Local rules
- Florida counties, cities and water management districts often have their own grading, fill and drainage permit rules for residential lots.
- Good to know
- Florida uses a reasonable-use test for drainage disputes between neighbors. State construction stormwater coverage starts at 1 acre, but local fill and drainage permits often apply to smaller jobs.
Contractor licensing in Florida
- Statewide rule
- License
- Agency
- Florida DBPR Construction Industry Licensing Board (CILB)
- Who needs it
- Contractors must be state-certified (work anywhere in Florida) or registered (only in the local jurisdictions where they hold competency) with the CILB.
- When it applies
- Licensed contractor required except casual/minor work under $2,500 total (labor + materials)
- Check a contractor
- Official lookup
- Licensed separately
- Electrical contractors are licensed by the separate Electrical Contractors' Licensing Board.
- Good to know
- The under-$2,500 exemption (Fla. Stat. 489.103(9)) does not apply if the work is part of a larger job, is split to avoid the law, or the person advertises as a contractor. Recovery Fund payouts are capped at $2 million (Division I) and $600,000 (Division II) per licensee.
Contractor license requirements in every state
Contractor deposits and your right to cancel in Florida
- Deposit limit
- No statewide cap. A contractor who takes more than 10% of the contract price as an initial payment on residential work must apply for permits within 30 days and start work within 90 days after permits are issued, unless the contractor has just cause for the delay or the owner agrees in writing to a longer period (Fla. Stat. § 489.126(2)).
- Who it covers
- Contractors doing repair, restoration, improvement or construction of residential real property (Fla. Stat. § 489.126).
- Right to cancel
- Home solicitation sales over $25 made away from the seller's place of business: 3 business days to cancel (Fla. Stat. §§ 501.021, 501.025). Sales that result from the buyer's own request for specific goods or services are excluded.
- Written contract
- Residential repair, restoration, improvement or construction contracts over $2,500 must include the Florida Homeowners' Construction Recovery Fund notice (Fla. Stat. § 489.1425).
- Other protections
- A contractor paid more than the value of the work performed may not fail or refuse to perform any work for any 90-day period (or another period set in the contract); if the contractor neither performs nor refunds within 30 days of the owner's written demand, a lack of just cause may be inferred (Fla. Stat. § 489.126(3)). Violations of § 489.126(2) and (3) carry misdemeanor or felony penalties depending on the amount (§ 489.126(5), (6)). The Florida Homeowners' Construction Recovery Fund covers certain losses caused by licensed contractors (§ 489.1425 notice).
- The law
- Fla. Stat. §§ 489.126, 489.1425; §§ 501.021–501.055 (home solicitation sales)
- Good to know
- Florida doesn't cap deposits, but if you pay more than 10% up front on a residential job, the contractor must apply for permits within 30 days and start within 90 days after permits issue. If you called the contractor to request the work, the 3-day home solicitation cancel right may not apply.
Contractor deposit limits in every state
Mechanics lien deadlines in Florida
- Lien deadline (prime)
- Record the claim of lien within 90 days after final furnishing of labor, services or materials (if the contract was terminated, the earlier of 90 days after termination or final furnishing), and serve the owner before or within 15 days after recording (Fla. Stat. § 713.08).
- Lien deadline (sub/supplier)
- Same as prime.
- Preliminary notice (sub/supplier)
- Required. Lienors not in privity with the owner (except laborers) must serve a Notice to Owner before starting or within 45 days after starting, and before the owner's final payment; sub-subs and suppliers to subs also send a copy to the contractor. Missing or late notice is a complete defense (Fla. Stat. § 713.06(2)(a)).
- Notice of intent
- Not required.
- Enforce within
- Action within 1 year after recording (or after an amended claim showing a later final furnishing date); 60 days after service if the owner records a notice of contest of lien (Fla. Stat. § 713.22). A contractor must give the owner its final payment affidavit at least 5 days before suing (§ 713.06(3)(d)).
- Homeowner rules
- Owners who pay properly, paying lienors who served a Notice to Owner and holding final payment until the contractor's final affidavit, limit their exposure (Fla. Stat. § 713.06(3)). Residential contracts over $2,500 must carry the lien disclosure (§ 713.015).
- The law
- Fla. Stat. Ch. 713, Part I (Construction Liens), § 713.001 et seq.
- Good to know
- Florida subcontractors and suppliers must send a Notice to Owner within 45 days of starting work. Homeowners should get a lien release from anyone who sent one before paying the contractor.
Mechanics lien deadlines in every state
Workers' comp requirements in Florida
- Who must carry it
- Construction: 1 or more employees, including the business owner. Non-construction: 4 or more employees, including owners who are corporate officers or LLC members. Agriculture: 6 regular or 12 seasonal workers (Fla. Stat. Ch. 440; Florida DFS Division of Workers' Compensation). Construction trades are defined in Fla. Admin. Code 69L-6.021.
- Owners and officers
- In construction, up to 3 corporate officers or LLC members per company (or affiliated group), each owning at least 10% of a Florida-registered corporation or LLC, may obtain exemptions; sole proprietors and partners in construction are treated as employees and cannot get an exemption. Outside construction, sole proprietors and partners are not employees unless they elect coverage (form DWC-251) (Florida DFS).
- Subcontractors
- When a contractor sublets part of its work, all employees on the job are treated as employed in one business, and the contractor must secure coverage for them unless the sub has already done so; a contractor must require subs to provide evidence of workers' comp insurance (Fla. Stat. § 440.10(1)(b)-(c); Fla. Admin. Code 69L-6.032). Keep copies of subs' policies or exemption certificates.
- Penalties
- Stop-work order within 72 hours that halts all business operations in the state; penalty of 2 times the premium the employer would have paid over the preceding 12 months, or $1,000, whichever is greater (look-back extends to 24 months in some cases) (Fla. Stat. § 440.107(7)(a), (7)(d), 2026).
- The law
- Fla. Stat. Ch. 440; §§ 440.02, 440.10, 440.107
- State agency
- Florida Department of Financial Services, Division of Workers' Compensation
- Good to know
- Florida construction businesses need coverage with even one employee, counting the owner. Only corporate officers or LLC members with at least 10% ownership can be exempt, up to three per company; construction sole proprietors can't be exempt.
Workers' comp requirements in every state
Planting zones in Florida
- 2023 USDA zones
- 8b to 11b
- Coldest-night range
- 15°F to 50°F
- Coldest area
- Northwest Panhandle interior (e.g., Jay)
- Warmest area
- The Florida Keys, including Key West and Marathon
- Example cities
- Tallahassee: 9a, Jacksonville: 9b, Orlando: 10a, Miami: 11a
- Local plant advice
- UF/IFAS Extension
- Good to know
- Much of peninsular Florida moved up on the 2023 map; coastal Manatee County, for example, went from mostly 9a-9b to 10a-10b. Only the Keys reach 11b.
Frost dates in Florida
| Station | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Tallahassee North Florida / Big Bend | March 11 | November 21 | 255 |
| Jacksonville Northeast Florida | February 25 | December 7 | 288 |
| Orlando Central Florida. Both typical dates fall in January, a short midwinter window. | January 25 | January 10 (next year) | 355 |
| Miami South Florida | No freeze in a typical year | 365 | |
- Typical range
- Last frost late Jan (Orlando) to mid-Mar (Tallahassee); first frost late Nov (Tallahassee) to early Jan of the new year (Orlando); no freeze in a typical year at the Miami airport station
- Good to know
- These are typical (50%) dates from NOAA's 1991–2020 climate normals, so about half of years still bring a 32°F night after the listed spring date. In Florida, the last spring frost at the stations listed ranges from late January around Orlando to mid-March around Tallahassee; Miami usually sees no freeze at all.
- Local frost or planting guide
- UF/IFAS Extension
Frequently Asked Questions
What building code does Florida use?
Florida Building Code, Residential, 8th Edition (2023), based on the 2021 International Residential Code. It applies as follows: statewide, mandatory everywhere. Your local building department can confirm the edition and amendments for your address.
How deep is the frost line in Florida?
The state sets 12 in. minimum footing depth below finished grade (FBC-Residential R403.1.4); no frost depth. Footings for houses, additions and attached decks go below it.
How much can a contractor ask for up front in Florida?
No statewide cap. A contractor who takes more than 10% of the contract price as an initial payment on residential work must apply for permits within 30 days and start work within 90 days after permits are issued, unless the contractor has just cause for the delay or the owner agrees in writing to a longer period (Fla. Stat. § 489.126(2)). Cancel rights: Home solicitation sales over $25 made away from the seller’s place of business: 3 business days to cancel (Fla. Stat. §§ 501.021, 501.025). Sales that result from the buyer’s own request for specific goods or services are excluded.
How long does a contractor have to file a mechanics lien in Florida?
Record the claim of lien within 90 days after final furnishing of labor, services or materials (if the contract was terminated, the earlier of 90 days after termination or final furnishing), and serve the owner before or within 15 days after recording (Fla. Stat. § 713.08). Subcontractors and suppliers may have different notice rules; see the section above.
What planting zone is Florida?
On the 2023 USDA map, Florida runs from zone 8b to 11b. Examples: Tallahassee 9a, Jacksonville 9b, Orlando 10a. Enter your ZIP on the USDA map for your exact zone.
Do contractors need workers' comp in Florida?
Construction: 1 or more employees, including the business owner. Non-construction: 4 or more employees, including owners who are corporate officers or LLC members. Agriculture: 6 regular or 12 seasonal workers (Fla. Stat. Ch. 440; Florida DFS Division of Workers’ Compensation). Construction trades are defined in Fla. Admin. Code 69L-6.021. Owner exemptions and subcontractor rules are in the workers’ comp section above.
When is the last frost in Florida?
At the NOAA stations we list: Last frost late Jan (Orlando) to mid-Mar (Tallahassee); first frost late Nov (Tallahassee) to early Jan of the new year (Orlando); no freeze in a typical year at the Miami airport station. These are typical (50%) dates from the 1991–2020 climate normals, so about half of years still bring a 32°F night after the spring date.
This page is general information, not legal or tax advice. Rules change; the agencies and statutes linked above have the final word.
Florida in each 50-state guide: Frost line depth · 811 dig laws · Retaining wall permits · Contractor licensing · Contractor deposit limits · Building codes · Planting zones · Mechanics lien deadlines · Workers' comp · Frost dates · Drainage laws · Noxious weed laws · Rainfall and snowfall · Landscaper pay · Pesticide applicator licensing · Landscaping sales tax · All state guides
Soil: Florida’s most common soils, state soil, and how much ground is wet, clayey or shallow to bedrock by county. Florida soil types
Last checked October 31 and November 1, 2026 against official state and local sources for this state. Rules change; your state agency or local building department has the final word. Spot something out of date? Email info@muthlerlandscaping.com and we’ll fix it.
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Cite as: Muthler Landscaping & Construction, “Florida Building Codes, Permits and Contractor Rules,” https://muthlerlandscaping.com/state-guides/florida/ (last checked November 12, 2026).
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