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 ...

Full ordinance details →Official source ↗

Shed & Carport Rules

Martin County caps a residential utility storage shed at 250 square feet of floor area in every zoning district under Land Development Regulations Sec. 3.201.C.1.a. The shed also cannot go up until the county has issued all permits for the main house it serves, per Sec. 3.201.B.1.

Backyard Shed Size Limit in Martin County

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.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. ... 3.201.C.1.a. One utility storage structure, incidental to a permitted use, provided no such structure shall exceed 25...

Full ordinance details →Official source ↗

All Martin County ordinances

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