Florida Keys Dock Permits: A Complete Guide for Property Owners

Getting a dock permit in the Florida Keys is unlike getting a permit anywhere else in Florida. The combination of federal, state, and sanctuary regulations that apply to Monroe County waterfront properties means the process involves more agencies, more documentation, and more potential delays than most property owners expect. This guide covers everything you need to know before starting a dock permit application in the Florida Keys.

Why Florida Keys Dock Permits Are More Complex

Most dock projects in Florida require two permits — one from the state (FDEP) and one from the local building department. In the Florida Keys, virtually every dock project requires four separate approvals. The reason is the Florida Keys National Marine Sanctuary, which covers nearly the entire Monroe County coastline and adds a layer of federal environmental review that does not apply anywhere else in the state.

The four agencies that typically must approve a dock project in Monroe County are the Florida Department of Environmental Protection (FDEP), the U.S. Army Corps of Engineers (ACOE), the Florida Keys National Marine Sanctuary (FKNMS), and your local municipality — whether that is the City of Marathon, the Village of Islamorada, Monroe County, or another local government. Each agency has its own application requirements, its own review timeline, and its own approval criteria. None of them can be skipped.

The Four Agencies Behind Every Florida Keys Dock Permit

1. Florida Department of Environmental Protection (FDEP)

FDEP issues the Environmental Resource Permit (ERP) — the foundational state-level approval that must be obtained before federal agencies will proceed. The ERP covers impacts to state waters, wetlands, and water quality. For most residential dock projects, FDEP reviews the dock design, the benthic survey findings, and whether the project meets state environmental standards. FDEP approval is the first step in the sequence, and nothing moves forward without it.

2. U.S. Army Corps of Engineers (ACOE)

The ACOE reviews dock projects under Section 10 of the Rivers and Harbors Act and Section 404 of the Clean Water Act, which govern impacts to navigable waters and aquatic resources. For many straightforward residential dock projects in the Florida Keys, the ACOE may authorize the project under a Nationwide Permit — a streamlined pathway for lower-impact projects. More complex projects, or those with significant environmental impacts, may require an Individual Permit, which involves a more detailed review and longer timeline.

3. Florida Keys National Marine Sanctuary (FKNMS)

The FKNMS reviews dock projects for consistency with sanctuary resource protection standards — specifically coral, seagrass, and hardbottom habitats. The sanctuary review is typically coordinated through the ACOE permit process. Projects that avoid or minimize impacts to sensitive benthic resources move through faster. Projects over seagrass or near coral may require design modifications or mitigation. A benthic survey conducted by an FKNMS-authorized biologist is commonly required to support this review.

4. Local Municipality

The local building permit is the final approval required before construction can begin. Depending on your property location, this may come from the City of Marathon, the Village of Islamorada, Monroe County, or another municipality. Local permits cannot be finalized without the state and federal approvals already in place, so the local permit is typically the last step in the sequence — not the first.

What Is a Benthic Survey and Do You Need One?

A benthic survey is a field assessment of seafloor conditions conducted by a qualified marine biologist. The biologist documents the presence and condition of seagrasses, corals, sponges, and other benthic resources within and around the proposed project area. FDEP, the ACOE, and the FKNMS commonly require a benthic survey for dock permit applications in Monroe County.

Whether your specific project requires a benthic survey depends on the project type, location, and water depth. Canal properties with no seagrass or coral present may not require a full survey. Properties fronting Florida Bay, the Atlantic, or areas with mapped seagrass typically will. Glen Boe & Associates holds an active FKNMS survey permit and performs all required surveys in-house — which means your survey and your permit application are coordinated by the same team, eliminating a common source of delay.

How Long Do Florida Keys Dock Permits Take?

Timeline varies significantly depending on project complexity, the agencies involved, and whether the application is complete and well-prepared when submitted. As a general guide:

• Simple canal dock with no benthic resources — 4 to 6 months is typical for properties with straightforward site conditions and no sensitive habitat present.
• Dock over seagrass or near coral — 9 to 12 months is more realistic when benthic resources are present, design modifications are required, or mitigation must be arranged.
• Projects requiring Individual Permits — these can exceed 12 months depending on project complexity and current agency workloads.

The most common cause of delays is an incomplete or poorly prepared application — one that requires agencies to issue requests for additional information, which restarts review clocks. For a detailed breakdown of what causes delays, see our post on why dock permits get delayed in the Florida Keys.

How Much Do Florida Keys Dock Permits Cost?

The total cost of obtaining a dock permit in the Florida Keys includes professional engineering and permitting fees, agency filing fees, benthic survey costs, and in some cases mitigation costs if unavoidable impacts to seagrass or other resources are involved. Mitigation credit costs in Monroe County have increased substantially in recent years and can represent a significant portion of overall project cost for properties over sensitive habitat. For a full cost breakdown with current mitigation pricing, see our post on how much a Florida Keys dock permit costs.

What Makes a Dock Permit Application Successful?

Successful Florida Keys dock permit applications share several characteristics. They are complete when submitted — all required drawings, survey data, and supporting documentation are included in the initial package. They are designed with agency requirements in mind from the start — not revised after an agency denial. And they are prepared by someone with direct experience navigating Monroe County’s specific regulatory environment.

Glen Boe & Associates has been managing Florida Keys dock permit applications since 1984. Our team includes a licensed Professional Engineer who prepares all construction drawings and permit applications, and an FKNMS-authorized biologist who conducts all required benthic surveys. We manage FDEP, ACOE, FKNMS, and local permit applications as a single coordinated process — from initial site consultation through permit issuance and contractor support.