Building permits, zoning and septic rules in Miami-Dade County, Florida

Unincorporated Miami-Dade County requires a building permit to construct, enlarge, alter, repair, move or demolish a building, to change its occupancy, and to install or replace regulated electrical, gas, mechanical or plumbing systems¹. Painting or wallpapering interior areas, installing a ceiling fan in an existing outlet, portable playground equipment and resurfacing an interior floor do not need a permit¹. Some permit-exempt work may still need a Zoning Improvement Permit, so permit-exempt does not mean approval-free². Miami-Dade County currently reviews work under the 8th Edition Florida Building Code, and permit applications submitted on or after December 31, 2026 must comply with the 9th Edition². The county's building-permit process applies only to properties whose folio numbers start with 30, which the county identifies as unincorporated Miami-Dade¹. Inspections are required for new construction, remodeling, renovation and trade work, and must happen before work is covered or concealed; the approved stamped plans and permit card must be on site, and each inspection beyond the initial one and one follow-up carries a fee¹¹. After final inspection approvals the county issues a Certificate of Occupancy¹².

Building permits for unincorporated property run through Regulatory and Economic Resources at the Herbert S. Saffir Permitting and Inspection Center, 11805 SW 26 Street, Miami, FL 33175; call 786-315-2000¹³. Zoning questions and Zoning Improvement Permits go to RER Development Services at the same address, 786-315-2660¹⁴. The county's rules apply to unincorporated Miami-Dade; inside Doral and Biscayne Park, the city issues building permits^4,5, and every municipality has its own Building Official¹. Septic permits and wells stay with the health department even inside a city (see the septic section). Building-permit fees vary with the permit type, work, home type, square footage and estimated project value, and other reviewing agencies may add charges¹⁵. Residential owners may act as their own general contractor, but the owner must pull the proper permits and sign an owner-builder responsibility acknowledgment before issuance; licensed subcontractors may be hired². The residential route covers a one-family or two-family residence or a farm outbuilding for the owner's own use, the property must be in a person's name rather than a company or trust, and selling or leasing within 24 months creates a presumption that the work violated the exemption¹⁶.

Unincorporated Miami-Dade County is regulated by the County's Zoning Code, while each incorporated municipality uses its own officials and regulations^3,7. Doral and Biscayne Park administer their own zoning^17,18, as do Coral Gables¹⁹, Cutler Bay²⁰, Aventura²¹, Bay Harbor Islands²², Bal Harbour²³ and El Portal²⁴. Every unincorporated parcel has a zoning-district classification that controls permitted uses and conditions²⁵. No single countywide number answers the dimensional questions: minimum lot size, setbacks, lot coverage and building height all depend on the parcel's district^3,8. Use the county's Land Management map or ask Development Services to identify the district before designing the site². Eligible owners in single-family districts may build or create an accessory dwelling unit with a site plan, county review and final approval¹².

Septic work in Miami-Dade has split oversight, and it does not move to a city when the city handles building permits and zoning⁶. The Florida Department of Health in Miami-Dade County handles septic permitting and inspection, while county DERM reviews and approves new and total-replacement onsite sewage systems⁶. Conventional Type 1 systems are not allowed for new and total-replacement systems serving development, residential or commercial⁶. The county also requires properties served by a septic system to be registered, with existing systems registered by January 1, 2024⁶. The owner may hire a private provider for septic inspections instead of waiting on the health department⁶. Florida requires a site evaluation and the applicable permit to install, replace, repair, modify or abandon an onsite sewage system²⁶. None of the county's mapped soils are rated without severe limits for a conventional drain field, so expect a site evaluation and an engineered or advanced-treatment system¹⁰. If a sewer lateral exists within the Water and Sewer Department service area, the property may be required to connect; moving from septic to sewer involves state abandonment approval, county allocation and plumbing approvals, Water and Sewer approval, and connection fees²⁷.

In Miami-Dade County's mobile home code (Chapter 19A), a recreational vehicle or other motor vehicle used as a dwelling place on the same site for 14 or more continuous days is classed as a "mobile home or motor vehicle used as housing", so a long-term RV stay is treated as housing rather than as camping²⁸. Travel trailers used as housing only from November 30 through May 1 are exempt from that chapter²⁸. We could not confirm a countywide rule on whether such housing is allowed on a given parcel, or on temporary camping, tiny-home occupancy or minimum dwelling size. Ask Development Services whether the proposed use and structure are allowed in the parcel's zoning district before buying or placing a unit. A temporary trailer or modular building used during construction requires a Zoning Improvement Permit¹⁴. Florida's RV-park rules allow transient occupancy in a permitted recreational vehicle park, but they do not establish permission to live in an RV on a private parcel outside a regulated park²⁹. A manufactured home needs an onsite installation inspection and a certificate of occupancy after compliance is confirmed, while Miami-Dade retains control over zoning, setbacks and site development³⁰. A tiny home must still fit the parcel's permitted use and district-specific dimensional rules².

1. Confirm whether the parcel is unincorporated or inside a municipality, because that determines the building and zoning authority⁷.
2. Identify the zoning district and verify the use, minimum lot size, setbacks, lot coverage and height before designing the project³.
3. Ask Water and Sewer whether the site must connect to an available sewer lateral; if not, begin the health department site evaluation and septic application, then coordinate DERM review^6,26,27.
4. If public water is unavailable, obtain health department approval before drilling and installing a potable well⁹.
5. Submit the building-permit application to RER and obtain any separate Zoning Improvement Permit the work requires; confirm the plans meet the 8th Edition Florida Building Code, or the 9th for applications on or after December 31, 2026^2,14.
6. Schedule every inspection listed for the permit before covering or concealing the work, then obtain the Certificate of Occupancy after final inspection approvals^11,12.

Verify the parcel's jurisdiction and zoning district first; a Miami-Dade mailing address does not tell you whether county or municipal rules apply⁷. Confirm the allowed use and all parcel-specific dimensions before relying on a listing description^2,3. Ask Water and Sewer about connection availability and price septic only after the required site evaluation, because none of the county's mapped soils are rated without severe conventional-drain-field limits^10,26,27. Confirm potable-water service or the approvals needed for a private well⁹. Also investigate floodplain requirements directly with the county before closing, because a complete parcel-level flood-development rule could not be confirmed. Carry realistic costs: the typical home-insurance premium is about $7,089 per year, while the effective property-tax rate is about 0.8% and the median tax bill is about $3,516 per year¹⁰.