Accessory Structures in Martin County, FL (2026)

2 rules for unincorporated Martin County, Florida.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Martin County. If you live within an incorporated city, that city's own rules apply: see the city list below.

ADU Rules

Martin County treats accessory dwelling units two ways. Countywide, LDR 3.51 allows them only as part of a nonresidential development, capped at three per lot. Inside a designated Community Redevelopment Area, LDR 12.1.04.7.a allows one ADU on a single-family or townhouse lot.

Accessory Dwelling Unit Rules in Martin County

Some Restrictions

Martin County LDR § 3.51 (Article 3, Zoning Districts) and §§ 12.1.01, 12.1.04.7.a (Article 12, Community Redevelopment Code); Martin County Code of Ordinances §§ 21.12 and 1.97

Housing; Authorizing a landlord to accept reusable tenant screening reports and require a specified statement; requiring, rather than authorizing, local governments to adopt, by a specified date, an ordinance to allow accessory dwelling units in certain areas; authorizing a local government to provide a density bonus incentive to landowners who make certain real property donations to assist in ...

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Shed & Carport Rules

Martin County allows one utility storage structure in every zoning district, capped at 250 square feet of floor area under LDR § 3.201.C.1.a. A shed cannot be established before every permit for the principal use is issued, and it must meet the same Article 3 standards as the house or business it serves.

Shed Rules in Martin County, Florida

Some Restrictions

Martin County LDR §§ 3.201.C.1.a and 3.201.B.1 (Article 3, Division 4, Accessory Uses and Structures)

3.201.B. Standards applicable to all accessory uses and structures. 1. With the exception of fences, walls and boat docks on lots zoned for single-family use, accessory uses and structures shall not be established on a lot prior to the issuance of all permits required for the development of the principal use to which it is accessory. 2. All accessory uses and structures shall comply with the st...

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All Martin County ordinances

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