Building permits, zoning and septic rules in Seminole County, Florida

At a glance

Building permit

Required; issued by the county Building Division¹

Zoning

Yes, in unincorporated Seminole County under the Land Development Code; cities may run their own land-use rules⁸³

Septic permits

State permit, issued by the county health department (DOH-Seminole)⁹

Owner-builder

Allowed on a home you own and occupy, not offered for sale or lease¹⁰

RV on your land

Temporary only, while a permanent home is under construction, and only in the A-1/A-3/A-5/A-10 agricultural districts¹¹

Accessory dwelling unit

Allowed, 1 per single-family home, on a lot at least 50 ft wide and 5,000 sq ft, if you live in one of the two units¹²

Minimum lot size (agricultural districts)

1 acre in A-1 up to 10 acres in A-10¹³

Driveway onto a county road

County driveway permit, $45 fee, 18-foot maximum width¹⁴

Who to call

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Do you need a building permit in Seminole County, Florida?

Yes. Seminole County requires permits for work regulated by Chapter 40, including construction, alteration, repair, movement, demolition and occupancy changes, although the code has exemptions and special provisions for emergency work¹². The county administers the Florida Building Code with a locally amended administrative chapter¹⁵. Required inspections can include foundation, slab or under-floor, frame, lath or gypsum, energy, final and flood-hazard documentation stages; the final inspection follows completion of all permitted work¹⁶. Occupancy generally requires a certificate issued after the building official inspects the structure and finds no violations, though permit-exempt work does not require one and a temporary certificate may cover a safely occupiable portion¹⁷. An owner-builder may directly supervise a one- or two-family home for personal occupancy if the home is not offered for sale or lease, and must still appear in person and sign the permit application; a sale or lease within 1 year of completion creates a presumption that the work was done for sale¹⁰. Any development in a floodplain also requires a building permit¹⁸. A qualifying nonresidential farm building may be exempt from building-code and county fee requirements, but not floodplain rules¹⁹.

Who is the Seminole County Building Division, and how do you reach them?

Seminole County's Building Division issues construction permits for unincorporated areas from the County Services Building at 1101 East 1st Street, Sanford, FL 32771, reachable at 407-665-7050 or bpcustomerservice@seminolecountyfl.gov²⁰. Its online service accepts applications and lets applicants track plan review, view fees, schedule inspections, retrieve results and check permit status²¹²². An owner applying online must first visit the office with government-issued identification²⁰²¹. Fees vary by application and permit type; the county's published fee schedule dates from a December 2023 resolution, and the county says interim fee updates were made in 2026 with more possible after a fee study²²²³. The county notes that concurrent plan review requires prior Planning and Zoning approval²⁴. Zoning and land-use questions go to the Planning & Development Division at 407-665-7371 or plandesk@seminolecountyfl.gov, at the same address²⁵.

Does Seminole County have zoning?

Yes, in unincorporated areas; inside Altamonte Springs and Casselberry the city sets zoning instead⁴⁵. Altamonte Springs also makes septic tanks unlawful within city limits except as its code provides, so check there before assuming a septic system is possible²⁶. Seminole County's Land Development Code regulates land development in the unincorporated county, while incorporated municipalities may administer their own land-use rules, so confirm whether the parcel sits inside a city³²⁷. Septic permits stay with the Florida Department of Health in Seminole County either way⁶. The published district table covers lot sizes, house sizes and setbacks, but is subject to amendment, and the zoning atlas map is the final authority on a parcel's district, so confirm the current standard with Planning & Development²⁸²⁹. Examples show a 1-acre minimum lot in A-1, 8,400 square feet in R-1 and 9,000 square feet in R-1A³⁰. Minimum house size is also district-specific: the table shows 700 square feet in R-1, 1,100 square feet in R-1A and 1,200 square feet in RC-1, while some districts show no minimum³¹. A duplex in R-2 needs 1,400 square feet³². The A-1 front setback is 50 feet; R-1 shows a 25-foot front setback and a 30-foot rear setback, subject to overlays and other district conditions; A-1 also shows a 10-foot side setback³³³⁴.

How do septic permits work in Seminole County?

A Seminole County septic application requires Form DEP 4015, a site evaluation by a qualified professional, review, fee payment and permit issuance³⁵. Florida's Department of Environmental Protection implements the governing rules, while the Florida Department of Health in Seminole County continues local septic permitting and inspection³⁶⁷. The local program inspects systems for proper design, construction and maintenance; an owner or authorized contractor may instead hire a private inspection provider³⁷. Reach the program at 407-665-3604 or 400 W. Airport Blvd., Sanford, FL 32773⁷. Soil survey data rates 0% of Seminole County soils as free of severe limitations for a conventional drain field, making the site evaluation especially important³⁸. A functioning septic system generally must connect within 365 days after written notice that qualifying public or investor-owned sewer service is available³⁹.

Can you live in an RV, tiny home or ADU on your land in Seminole County?

Living in an RV on your own land in Seminole County is limited to temporary occupancy while a permanent home is under construction in the A-1, A-3, A-5 and A-10 districts, with case-by-case Planning & Development approval¹¹. We could not confirm a separate tiny-home occupancy rule, so ask Planning & Development to classify the proposed unit and parcel before buying²⁵. Manufactured housing is zoning-dependent: the county table identifies RM-1 and RM-2 as single-family mobile-home districts, with a 7,000-square-foot minimum lot in RM-1 and a 5,000-square-foot minimum lot plus a 10-acre minimum development size in RM-2⁴⁰. An accessory dwelling unit (ADU) is limited to one per single-family detached home on a lot at least 50 feet wide with at least 5,000 square feet, needs administrative approval from the Planning & Development Division Manager, and needs one off-street parking space; in A-1 the ADU is also limited to 35% of the main residence's gross floor area¹²⁴¹. An ADU cannot be sold separately, one of the two homes must remain owner-occupied, and any lease must run at least 30 days; homeowner-association restrictions still apply⁴².

How do you build a home in Seminole County, step by step?

1. Confirm the parcel's zoning district, allowed dwelling type, lot size and setbacks with Planning & Development²⁵²⁸.
2. If the property needs septic, obtain a professional site evaluation and submit the OSTDS application to the Florida Department of Health in Seminole County³⁵⁷.
3. If the property needs a well, identify the responsible water management district or delegated authority and obtain its permit before construction⁴³.
4. If the driveway meets a county-owned road in unincorporated Seminole County, get a residential driveway permit ($45 fee; maximum width 18 feet plus a 3-foot flare each side; concrete or brick-paver apron; culvert at least 18 inches unless approved otherwise)¹⁴; the county says these are typically processed within 3 business days¹⁴. A subdivision plat may also limit direct driveway access¹⁴⁴⁴.
5. Apply through the Building Division's online service, after an in-person identity check if applying as the owner, and review the fee shown for the permit type²¹²².
6. In a flood-hazard area, submit lowest-floor elevation certification before further vertical construction and final flood documentation before final inspection⁴⁵. Raising the living area 1 foot above base flood elevation is typical for residential structures¹⁸.
7. Complete every applicable inspection, including the final inspection after permitted work is finished¹⁶.
8. Obtain the certificate of occupancy before use; regulated utility, power, energy or fuel connections also require release by the building official¹⁷⁴⁶.

What should you check before buying land in Seminole County?

Confirm the parcel's zoning district before buying because lot size, house size, setbacks, RV use, ADUs and manufactured housing are district-specific²⁸⁴⁰. Soil survey data rates 0% of Seminole County soils as free of severe limitations for a conventional drain field, so make the septic site evaluation a contract contingency³⁸. For flood-hazard land, note that work equal to 50% or more of a building's market value counts as substantial improvement and must meet new-building standards¹⁸; also confirm the elevation-certification and final-documentation requirements before pricing the build⁴⁵. If you plan to split the land, a minor plat covers no more than 4 agricultural or residential lots, and other divisions must go through subdivision platting; ask Planning & Development⁴⁷²⁵. Also verify recorded access because subdivision approval can restrict driveways from lots fronting a road⁴⁴. Typical home value is about $404,888, while the effective property-tax rate is about 0.7% and the median annual bill is about $2,493⁴⁸⁴⁹⁵⁰.

Watch-outs

• Seminole County's Building Division says major changes to its permitting operations took effect July 1, 2026, tied to amendments to Florida Statutes Chapter 553 and updates to the county's Land Development Code; confirm current requirements with the Building Division before relying on anything that predates that change²⁰.
• RV occupancy on your own land in Seminole County is temporary-only, tied to construction of a permanent home, limited to the A-1/A-3/A-5/A-10 agricultural districts, and subject to case-by-case Planning Division approval; it is not a general right to live in an RV long-term or in other zoning districts¹¹.
• We could not confirm Seminole County rules on tiny-home occupancy, general short-term rentals, off-grid sanitation, or which authority issues a private-well permit here; ask Planning & Development and the Building Division before assuming either way²⁵²⁰.

Sources

1. Seminole County Code Chapter 40 Building and Construction Appendix A (2026 county census)
2. Seminole County Code Chapter 40 Building and Construction Appendix A, quoted and re-checked
3. Codes and Regulations, quoted and re-checked
4. Altamonte Springs: LDC 3.8.2 R-2 Uses permitted (Seminole County), quoted and re-checked
5. Casselberry: Casselberry ULDR Sec. 2-7.18 Manufactured housing (Seminole County), quoted and re-checked
6. Onsite Sewage and Disposal - Florida Department of Health in Seminole County, quoted and re-checked
7. Florida Department of Health in Seminole County, Environmental Public Health (seminole.floridahealth.gov)
8. Codes and Regulations (2026 county census)
9. FL DOH in Seminole County - Onsite Sewage and Disposal (2026 county census)
10. 2025 Florida Statutes, Section 489.103, quoted and re-checked
11. Mobile Home Process and Requirements, quoted and re-checked
12. Future Land Use Element, quoted and re-checked
13. Table of Zoning District Regulations, quoted and re-checked
14. Utility Permitting, quoted and re-checked
15. Building Forms | Seminole County, quoted and re-checked
16. Seminole County Code Chapter 40 Building and Construction Appendix A, quoted and re-checked
17. Seminole County Code Chapter 40 Building and Construction Appendix A, quoted and re-checked
18. Flood, quoted and re-checked
19. Florida Statutes § 604.50, Nonresidential farm buildings; farm fences; farm signs (Florida statewide rule), quoted and re-checked
20. Seminole County Building Division (seminolecountyfl.gov)
21. Building | Seminole County, quoted and re-checked
22. Building | Seminole County, quoted and re-checked
23. Fee Information, quoted and re-checked
24. Building Forms, quoted and re-checked
25. Seminole County Planning & Development Division (seminolecountyfl.gov)
26. Altamonte Springs: official source (Seminole County), quoted and re-checked
27. Codes and Regulations, quoted and re-checked
28. Table of Zoning District Regulations, quoted and re-checked
29. Certified copy of LDC Fix-It Ordinance 2024-21, quoted and re-checked
30. Table of Zoning District Regulations, quoted and re-checked
31. Table of Zoning District Regulations, quoted and re-checked
32. Table of Zoning District Regulations, quoted and re-checked
33. Table of Zoning District Regulations, quoted and re-checked
34. Table of Zoning District Regulations, quoted and re-checked
35. Onsite Sewage and Disposal - Florida Department of Health in Seminole County, quoted and re-checked
36. Onsite Sewage and Disposal - Florida Department of Health in Seminole County, quoted and re-checked
37. Onsite Sewage and Disposal - Florida Department of Health in Seminole County, quoted and re-checked
38. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
39. leg.state.fl.us (Florida statewide rule), quoted and re-checked
40. Table of Zoning District Regulations, quoted and re-checked
41. Table of Zoning District Regulations, quoted and re-checked
42. Owner Statement of Acknowledgment for Accessory Dwelling Unit, quoted and re-checked
43. Water Well Contractor Licensing and Permitting (Florida statewide rule), quoted and re-checked
44. Subdivision Application Procedure Summary, quoted and re-checked
45. Seminole County Code Chapter 40 Building and Construction Appendix A, quoted and re-checked
46. Seminole County Code Chapter 40 Building and Construction Appendix A, quoted and re-checked
47. seminolecountyfl.gov, quoted and re-checked
48. Typical home value (Zillow): Bolthole Index county data
49. Effective property tax rate: Bolthole Index county data
50. Median property tax bill: Bolthole Index county data

Written October 16, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.