Building permits, zoning and septic rules 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 work¹. The county administers the Florida Building Code with a locally amended administrative chapter¹¹. 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 work¹. 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 portion¹. 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 sale⁶. Any development in a floodplain also requires a building permit¹². A qualifying nonresidential farm building may be exempt from building-code and county fee requirements, but not floodplain rules¹³.

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.gov¹⁴. Its online service accepts applications and lets applicants track plan review, view fees, schedule inspections, retrieve results and check permit status¹¹. An owner applying online must first visit the office with government-issued identification^11,14. 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 study^11,15. The county notes that concurrent plan review requires prior Planning and Zoning approval¹⁶. Zoning and land-use questions go to the Planning & Development Division at 407-665-7371 or plandesk@seminolecountyfl.gov, at the same address¹⁷.

Yes, in unincorporated areas; inside Altamonte Springs and Casselberry the city sets zoning instead^3,4. Altamonte Springs also makes septic tanks unlawful within city limits except as its code provides, so check there before assuming a septic system is possible¹⁸. 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 city^2,19. Septic permits stay with the Florida Department of Health in Seminole County either way⁵. 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 & Development^9,20. Examples show a 1-acre minimum lot in A-1, 8,400 square feet in R-1 and 9,000 square feet in R-1A⁹. 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 minimum⁹. A duplex in R-2 needs 1,400 square feet⁹. 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 setback⁹.

A Seminole County septic application requires Form DEP 4015, a site evaluation by a qualified professional, review, fee payment and permit issuance⁵. Florida's Department of Environmental Protection implements the governing rules, while the Florida Department of Health in Seminole County continues local septic permitting and inspection⁵. The local program inspects systems for proper design, construction and maintenance; an owner or authorized contractor may instead hire a private inspection provider⁵. Reach the program at 407-665-3604 or 400 W. Airport Blvd., Sanford, FL 32773⁵. Soil survey data rates 0% of Seminole County soils as free of severe limitations for a conventional drain field, making the site evaluation especially important²¹. A functioning septic system generally must connect within 365 days after written notice that qualifying public or investor-owned sewer service is available²².

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 approval⁷. We could not confirm a separate tiny-home occupancy rule, so ask Planning & Development to classify the proposed unit and parcel before buying¹⁷. 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-2⁹. 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 area^8,9. 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 apply²³.

1. Confirm the parcel's zoning district, allowed dwelling type, lot size and setbacks with Planning & Development^9,17.
2. If the property needs septic, obtain a professional site evaluation and submit the OSTDS application to the Florida Department of Health in Seminole County⁵.
3. If the property needs a well, identify the responsible water management district or delegated authority and obtain its permit before construction²⁴.
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)¹⁰; the county says these are typically processed within 3 business days¹⁰. A subdivision plat may also limit direct driveway access^10,25.
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 type¹¹.
6. In a flood-hazard area, submit lowest-floor elevation certification before further vertical construction and final flood documentation before final inspection¹. Raising the living area 1 foot above base flood elevation is typical for residential structures¹².
7. Complete every applicable inspection, including the final inspection after permitted work is finished¹.
8. Obtain the certificate of occupancy before use; regulated utility, power, energy or fuel connections also require release by the building official¹.

Confirm the parcel's zoning district before buying because lot size, house size, setbacks, RV use, ADUs and manufactured housing are district-specific⁹. 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 contingency²¹. 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 standards¹²; also confirm the elevation-certification and final-documentation requirements before pricing the build¹. 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 & Development^17,26. Also verify recorded access because subdivision approval can restrict driveways from lots fronting a road²⁵. Typical home value is about $404,888, while the effective property-tax rate is about 0.7% and the median annual bill is about $2,493²¹.