Dock, pier and float rules in Sandwich, Massachusetts
A private dock or pier in Sandwich needs an Order of Conditions from the Conservation Commission, and a license from the Massachusetts Department of Environmental Protection. A dock over a salt marsh must have its lowest structural member at least 60 inches above the marsh, and coastal docks must sit on driven piles or helical anchors. The town's bylaws we reviewed set no specific dock length or size limit.
| Town approval | Order of Conditions from the Conservation Commission [1] |
| State approval | License from the Massachusetts DEP (state waterways license) [1] |
| Height over salt marsh | Lowest structural member at least 60 inches above the marsh [2] |
| Foundation in coastal areas | Driven piles (wood or steel) or helical screw anchors designed by a MA engineer [2] |
| Conservation jurisdiction | Work in or within 100 ft of water bodies, banks, beaches, marshes; includes installing piles [4] |
| Boat speed near licensed docks | Headway speed (max 6 mph), no wake within 150 ft [6] |
What approvals you need
Sandwich's boating bylaw (Chapter 9) defines "Licensed Docks and Piers" as docks and piers with a valid Order of Conditions from the Sandwich Conservation Commission and a valid license from the Massachusetts Department of Environmental Protection to install and maintain them [1]. The Conservation Commission's authority comes from the Wetlands Bylaw (Chapter 7). It covers any building on or altering of land in or within 100 feet of ponds, the ocean, bays, streams, banks, beaches, flats and marshes [4]. Under that bylaw, "alter" includes erecting structures of any kind and installing piles, except under the Commission's pier maintenance regulations [5].
Design standards
Conservation Commission Regulation No. 13 requires walkways and docks on land under the ocean, coastal beaches, dunes, barrier beaches and salt marsh to use driven piles or helical screw anchors designed by a Massachusetts engineer. When a pier, dock or deck is over a salt marsh, its lowest horizontal structural member must be at least 60 inches above the marsh [2]. Regulation No. 9's 50-foot undisturbed buffer still applies, but water-dependent structures such as docks may be allowed within the buffer at the Commission's discretion [3]. The town documents we reviewed set no maximum dock length, width or float size, and no seasonal-versus-permanent rules. The Commission reviews each application through its Notice of Intent process.
On the water
Chapter 9 requires headway speed (no more than 6 mph) and no wake within 150 feet of licensed docks and piers, floats, marinas, mooring areas and swimmers [6]. It also sets horsepower limits on many ponds.
Town marina and moorings
If you just need a place to keep a boat, the town's Sandwich Marina (East Boat Basin, on the Cape Cod Canal) leases recreational, commercial and transient slips through the Harbormaster [7]. We didn't find town mooring regulations or a mooring permit page online for Scorton Creek, Old Harbor/Mill Creek or the ponds. Contact the Harbormaster's Office (508-833-0808).
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Next steps
- Contact the Natural Resources Department (508-833-8054, conservation@sandwichmass.org) to discuss the dock location and resource areas before designing.
- Have a Massachusetts engineer design the dock on driven piles or helical anchors (at least 60 in. above any salt marsh), and file a Notice of Intent with the Conservation Commission for an Order of Conditions.
- Apply to MassDEP for the state waterways license the bylaw refers to (the Chapter 91 license described in the state rules on this page).
- For slip or mooring questions, call the Harbormaster's Office at 508-833-0808.
Common questions
- Do I need a permit to build a dock in Sandwich, Massachusetts?
- Yes. A private dock or pier in Sandwich needs an Order of Conditions from the Conservation Commission and a license from the Massachusetts Department of Environmental Protection. File a Notice of Intent with the Conservation Commission first.
- How high does a dock have to be over a salt marsh in Sandwich, MA?
- At least 60 inches. A dock over a salt marsh must have its lowest structural member at least 60 inches above the marsh, and coastal docks must sit on driven piles or helical anchors designed by a Massachusetts engineer.
- Is there a maximum dock length in Sandwich, Massachusetts?
- The town bylaws we reviewed set no maximum dock length, width or float size. The Conservation Commission reviews each dock through its Notice of Intent process.
- How do I get a mooring or boat slip in Sandwich, MA?
- The town's Sandwich Marina (East Boat Basin, on the Cape Cod Canal) leases recreational, commercial and transient slips through the Harbormaster. We didn't find town mooring regulations or a mooring permit page online, so contact the Harbormaster's Office.
Massachusetts state rules for docks and piers
A private dock in Massachusetts usually needs several layers of approval beyond local zoning.
Chapter 91 waterways license (MassDEP): any structure, regardless of size, permanent or seasonal, in tidal waters, in a great pond (a pond over 10 acres in its natural state), or in certain navigable rivers needs Chapter 91 authorization (M.G.L. c. 91; 310 CMR 9.00). For small residential docks there are simpler routes:
- a General License certification for pile-supported residential docks, piers, ramps and floats with no fill or dredging, outside ACECs and Designated Port Areas (310 CMR 9.29)
- a Simplified License for residential docks up to 600 sq ft below the high-water line (310 CMR 9.10)
Licenses must be recorded at the Registry of Deeds, and Chapter 91 protects public rights to fish, fowl and navigate.
Conservation Commission: dock work in or near wetlands, banks or land under water needs an Order of Conditions under the Wetlands Protection Act (c. 131, §40).
Harbormaster: bottom-anchored moorings, floats and rafts (no pilings) can be authorized by an annual permit from the local harbormaster instead of a Chapter 91 license (c. 91, §10A). Mooring fees can't discriminate based on residence.
U.S. Army Corps of Engineers: work in navigable waters may also need federal approval. Small private piers and floats are often covered by the Corps' Massachusetts General Permits, which can involve self-verification or pre-construction notification.
What the bylaw says
- Ch. 9 Boat Operations and Use of Waterways, Definitions (4), Town of Sandwich Town Bylaws (Town Clerk edition dated May 4, 2026), p. 73
“Licensed Docks and Piers” shall mean docks and piers that have a valid Order of Conditions from the Sandwich Conservation Commission and a valid license from the Massachusetts Department of Environmental Protection, to install and maintain the dock or pier.
- Regulation No. 13, Part I, Sandwich Conservation Commission Regulations (Regulations No. 1-13), p. 19
When the structure is a pier, dock or deck installed in or over a Salt Marsh, the lowest horizontal structural member shall be elevated to a minimum height of sixty (60) inches over the marsh, as measured, directly under the proposed structure.
- Regulation No. 9, Part 1, Sandwich Conservation Commission Regulations (Regulations No. 1-13), p. 11
This regulation shall not be construed to preclude elevated walkways, narrow (twenty four (24) inches or less) access paths, restricted vista pruning or construction of water dependent structures within the buffer zone, any of which may be permitted at the Conservation Commission's discretion.
- Ch. 7, Section 7.10 Jurisdiction, Part 1, Town of Sandwich Town Bylaws (Town Clerk edition dated May 4, 2026), p. 64
Except as permitted by the Conservation Commission or provided in this bylaw, no person shall remove, fill, dredge, build upon, or alter land in or within one hundred (100) feet of the following resource areas: freshwater wetland, coastal wetland, vegetated wetland, unvegetated wetland, surface water body, ocean, bay, estuary, stream/creek (intermittent or continuous, natural or manmade), and land under said water, any bank, beach, dune, flat, marsh, wet meadow, bog, swamp, or any land subject to coastal action, or inundation by groundwater, surface water, tidal action, coastal storm flowage or land subject to flooding within the one-hundred (100) year and five-hundred (500) year flood zone as identified on the most recent FIRM (Flood Insurance Rate Maps) for the Town of Sandwich as established by FEMA (Federal Emergency Management Agency).
- Ch. 7, Section 7.80 Definitions, Alter (f), Town of Sandwich Town Bylaws (Town Clerk edition dated May 4, 2026), p. 70
Erection of buildings or structures of any kind, installation of piles except in accordance with any pier maintenance regulations established by the Commission;
- Ch. 9, speed rules (3), Town of Sandwich Town Bylaws (Town Clerk edition dated May 4, 2026), p. 74
Vessel speed shall not exceed headway speed and no wake - wash shall be created in areas posted by the Town, within marked channels, nor within one hundred fifty (150) feet of individual bathers, divers, small vessels propelled by means other than machinery (e.g. rowboats, sailboats), mooring areas, public and private boat launch areas, floats, marinas, licensed docks and piers, vessels not underway, nor within a limited operation zone.
- Sandwich Marina page, About, Sandwich Marina (East Boat Basin) page - Harbormaster
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