Dock, pier and float rules in Bath, Maine
Yes, with city and state approval. Bath's Land Use Code allows one pier, dock or wharf per lot, subject to Planning Board site plan approval in the residential districts and the shoreland rules; a new permanent dock over the water also needs a Maine DEP permit and possibly Army Corps approval. A float or mooring in the harbor needs a permit from the Harbormaster.
| City approval (Table 8-1) | Planning Board site plan approval; allowed in every district except GC and TMC [9] |
| Number allowed | One per lot (a second only with double lot width and 400 ft of residential shore frontage) [2] |
| Temporary noncommercial dock width | 6 ft max [3] |
| Structures on a dock | Max 20 ft high (except DB, MC and I districts) [4] |
| State and federal permits | Maine DEP (NRPA) for new permanent structures; Army Corps may be required [1] |
| Floats and moorings | Harbormaster permit required [6] |
| Mooring permit renewal | Yearly application; fee due by May 1 [7] |
| Living space on a dock | Existing structures can't be converted to dwellings [10] |
| Shoreland Zoning Permit | Required for all development in the Shoreland Zone [11] |
City approval
Bath's new Land Use Code (in effect since September 23, 2026) sends piers, docks and other marine structures to the shoreland standards in §7.3.E.10 [5]. In the use table (Table 8-1), a half-filled circle means a use is permitted subject to site plan approval by the Planning Board [8]. The Piers, Docks, and Other Marine Structures row shows a half-filled circle under all six residential districts and the NC, CC, DB, CG, MC, CX, WMU, I and PO districts, and is blank (not permitted) under GC and TMC [9]. A Shoreland Zoning Permit is also required for all development in the shoreland zone [11].
Size and design limits
Only one pier, dock, wharf or similar structure is allowed per lot. A second one is possible only on a lot at least twice the district's minimum width, with at least 400 feet of shore frontage for residential or recreational use (600 feet for commercial) [2]. A dock should be no larger than needed and fit the area, and a temporary noncommercial pier, dock or wharf can be no wider than 6 feet [3]. Access from shore has to control erosion, and the dock can't interfere with beaches. The Harbor Master or designee decides whether its location minimizes harm to fisheries. Except in the DB, MC and I districts, structures on a dock can't exceed 20 feet in height above it, and existing structures on docks can't be converted to dwellings [10]. On non-tidal waters, a new permanent dock is allowed only if a temporary one isn't feasible.
State and federal permits
New permanent structures and expansions projecting into or over the water need a Maine DEP permit under the Natural Resources Protection Act, and Army Corps of Engineers permits may be required in navigable waters [1].
Floats and moorings
Under the Harbor ordinance (Chapter 16), you can't place a mooring or float in the harbor without a Harbormaster permit at a Harbormaster-approved location [6]. Mooring owners apply each year and pay the fee by May 1. When all mooring permits are issued, there's a first-come, first-served waiting list [7].
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Next steps
- Check the zoning map for your district and shoreland subdistrict, and talk with Planning & Development (207-443-8363) about site plan review and the Shoreland Zoning Permit.
- Contact the Maine DEP about a Natural Resources Protection Act permit, and the U.S. Army Corps of Engineers for tidal or navigable waters.
- Ask the Harbormaster (Sgt. Dan Couture, 207-443-5563) about fisheries concerns and any float or mooring permit.
- Keep a seasonal noncommercial dock 6 feet wide or less, and don't add living space on it.
Common questions
- Do I need a permit to build a dock in Bath, Maine?
- Yes. Bath's Land Use Code requires Planning Board site plan approval for piers and docks, plus a Shoreland Zoning Permit. A new permanent dock over the water also needs a Maine DEP permit under the Natural Resources Protection Act, and Army Corps permits may be required.
- How many docks can I have on my lot in Bath, Maine?
- One pier, dock or wharf per lot. A second is possible only on a lot at least twice the district's minimum width with at least 400 feet of shore frontage for residential use.
- How wide can a temporary dock be in Bath, Maine?
- A temporary noncommercial pier, dock or wharf can be no wider than 6 feet. Structures on a dock can't be more than 20 feet tall above it, except in the DB, MC and I districts, and existing structures on docks can't be converted to dwellings.
- Do I need a mooring permit in Bath, Maine?
- Yes. You can't place a mooring or float in the harbor without a Harbormaster permit at an approved location. Mooring owners apply each year and pay the fee by May 1, and there's a first-come, first-served waiting list once all permits are issued.
State and federal rules for docks and piers
DEP permit (Natural Resources Protection Act): Building, repairing or altering a permanent structure in, on or over a great pond, river, stream or coastal wetland needs a DEP permit. "Permanent" means the structure stays in place more than 7 months in any 12-month period. A seasonal dock that comes out each year generally isn't a permanent structure.
State shoreland minimums (your town's ordinance applies these):
- Only one pier, dock or wharf per lot, unless the lot has at least twice the minimum shore frontage.
- A temporary, non-commercial dock on fresh water can be no wider than 6 ft.
- A new permanent dock on fresh water is allowed only if a temporary dock isn't feasible and DEP has issued a permit.
- No living space on or attached to a dock.
State-owned bottom: Below the low-water mark in tidal waters and in great ponds, the bottom belongs to the state. Permanent structures of any size, and large temporary ones, need a lease or easement from the Bureau of Parks and Lands. Non-permanent structures under 500 sq ft don't need one.
Federal and harbor rules: In tidal waters, docks and floats also need U.S. Army Corps of Engineers approval. Moorings are handled by your town's harbormaster under local ordinance (38 M.R.S. §7).
What the ordinance says
- LUC §7.3.E.10 Structures Extending Over or Below a Water Body, City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 62
New permanent structures, and expansions thereof, projecting into or over water bodies require a permit from the Maine Department of Environmental Protection pursuant to the Natural Resources Protection Act, Title 38 M.R.S., § 480-C, as amended. Permits may also be required from the U.S. Army Corps of Engineers if located in navigable waters.
- LUC §7.3.E.10.a, City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 62
No more than one pier, dock, wharf, or similar structure extending over or located below the normal high-water line of a water body, or within a wetland or shoreline stabilization area is permitted on a single lot; except on single lots having a lot width of at least twice the minimum requirement of the base zoning district, and shore frontage of at least 400 feet for residential, public or private recreation uses, and 600 feet for commercial uses, a second structure may be permitted and may remain as long as the lot is not further divided.
- LUC §7.3.E.10.e, City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 62
The structure shall be no larger in dimension than necessary to carry on the activity and be consistent with the surrounding character and uses of the area. A temporary pier, dock, or wharf shall not be wider than six feet for noncommercial uses.
- LUC §7.3.E.10.h-i, City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 62
Except in the underlying DB, MC, and I Districts, structures built on, over or abutting a pier, wharf, dock or other structure extending beyond the normal high-water line of a water body or within a wetland may not exceed 20 feet in height above the pier, wharf, dock or other structure.
- LUC §8.3.CC Piers, Docks, and Other Marine Structures, City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 88
Piers, Docks, and Other Marine Structures are subject to the standards of § 7.3.E.10.
- Ch. 16 Harbor, Art. V, Section A Placement of Private Moorings or Floats, Code of Ordinances Chapter 16 - Harbor, p. 9
It shall be a violation of this Ordinance to place any mooring or float in the harbor without a permit from the Harbormaster, or in a location not approved by the Harbormaster.
- Ch. 16 Harbor, Art. IV, Section C Permits and Registration Procedure, Code of Ordinances Chapter 16 - Harbor, p. 7
Each mooring owner will annually submit a mooring permit application and pay a fee set by Resolution of the City Council of the City of Bath, which fee shall be specified in the Schedule of Harbor Fees. This fee shall be paid to the City Treasurer on or before May 1st of each year.
- LUC Table 8-1 Use Matrix, legend, City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 78
⏺ = Permitted Use (May require Site Plan Approval) // ◐ = Permitted subject to Site Plan Approval by the Planning Board // Blank = Not Permitted
- LUC Table 8-1 Use Matrix, Piers/Docks and Short-Term Rental rows (read by column), City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 78
Piers, Docks, and Other Marine Structures § 8.3.CC Short-Term Rental § 8.3.JJ R-R ◐ ⏺ R-T ◐ ⏺ R-C ◐ ⏺ R-UC ◐ ⏺ R-WM ◐ ⏺ R-WH ◐ ⏺ NC ◐ ⏺ CC ◐ ⏺ DB ◐ ⏺ CG ◐ ⏺ MC ◐ CX ◐ ⏺ WMU ◐ ⏺ I ◐ GC PO ◐ TMC
- LUC §7.3.E.10.i, City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 62
No existing structures built on, over or abutting a pier, dock, wharf, or other structure extending beyond the normal high-water line of a water body or within a wetland shall be converted to residential dwelling units in any sub-district.
- LUC §7.3.F.1.a Permit Required, City of Bath Land Use Code (new code adopted by City Council 2026-09-02, effective 2026-09-23), p. 68
All development or other land use activity within the Shoreland Zone Overlay District shall require a Shoreland Zoning Permit from the applicable Review Authority.