Building near the water in Winchester, Massachusetts (wetlands rules)
Any building, grading, filling or tree removal within 100 ft of a wetland, pond, river or stream in Winchester needs a permit from the Conservation Commission under the town Wetlands Bylaw. Within 25 ft of the water, the Commission presumes no alteration at all, including structures, will be allowed except for narrow listed exceptions.
| Jurisdiction | Within 100 ft of any wetland, bank, lake, pond, river or stream, and land subject to flooding [1] |
| Permit | Conservation Commission permit required for any activity in jurisdiction [2] |
| 25-ft buffer | No alteration (incl. structures, grading, paving, vegetation removal) except listed exceptions [3] |
| Work in 100-ft buffer | Must significantly improve the 25-ft buffer unless already native vegetation [4] |
| Larger buffers | 50-100 ft may be required (e.g., vernal pool, steep slopes) [5] |
| Tree removal | Trees 6 in. DBH or more may need replacement with equivalent total diameter [6] |
| Permit term | 3 years, one 1-year extension [7] |
| Flood zones | Floodplain Overlay District: new construction must meet state building code flood rules [8] |
The Wetlands Bylaw we reviewed is a scanned town PDF that may predate later amendments (the current text is on eCode360); the 25-ft buffer and tree regulations are from 2025.
What area is covered
Winchester's Wetlands Bylaw (Code of Bylaws Chapter 13) bars anyone from removing, filling, dredging, altering or building on or within 100 ft of any freshwater wetland, bank, lake, river, pond or stream, or on land subject to flooding, without Conservation Commission approval [1]. "Alter" includes building any structure and cutting trees. The bylaw also protects visual access to the Aberjona River, Mystic Lake, Wedge Pond and other named waters. No activity within this jurisdiction may proceed without a permit [2].
The 25-foot buffer
Under regulations approved May 27, 2025, no alteration (including removing native vegetation, grading, paving, filling or building structures) is permitted within 25 ft of freshwater wetlands, lakes, ponds, rivers and streams, except for listed cases (and limited public-benefit or hardship exceptions) such as safety-related tree removal, invasive-plant control, narrow pervious paths and docks where allowed [3]. Any development elsewhere in the 100-ft buffer must significantly improve the 25-ft buffer, for example by replacing lawn with native plants, unless it's already naturally vegetated [4]. Buffers of 50 to 100 ft may be required near vernal pools or steep slopes [5]. Fertilizer is banned within 25 ft.
Trees
The Commission must approve tree removal in wetlands and the 100-ft buffer; trees 6 in. or more in diameter may have to be replaced with trees of equivalent total diameter, or a payment made to the Conservation Tree Fund [6].
Process
Applications need engineer- or surveyor-stamped plans, an abutter list and a public hearing. The bylaw lets the Commission set permit fees; ask the Conservation Administrator for the current fee schedule. Permits last 3 years and can be extended once for a year [7], and must be recorded at the Registry of Deeds before work starts.
Flood zones
In FEMA flood zones (the Floodplain Overlay District), new construction must meet state building code flood standards [8].
Next steps
- Contact the Conservation Administrator to find out whether your project is within 100 ft of a wetland or water body.
- If unsure, file a Request for Determination of Applicability with the Commission (ask the Conservation Administrator for the current fee).
- For work within the buffer, hire an engineer or surveyor for stamped plans and a wetland delineation, then file a permit application with abutter list; plan to restore native plantings in the 25-ft buffer.
- Record the permit at the Middlesex South Registry of Deeds and post the bylaw file-number sign before starting work.
Common questions
- Do I need a permit to build near a wetland in Winchester, Massachusetts?
- Yes. Any building, grading, filling or tree removal within 100 ft of a wetland, pond, river or stream needs a Conservation Commission permit under the Wetlands Bylaw.
- How close to the water can I build in Winchester, Massachusetts?
- Within 25 ft of the water, the Commission presumes no alteration at all, including structures, will be allowed except for narrow listed exceptions.
- Do I need to replace trees I remove near water in Winchester, Massachusetts?
- Trees 6 in. DBH or more may need replacement with equivalent total diameter.
- How long does a wetlands permit last in Winchester, Massachusetts?
- 3 years, with one 1-year extension.
Massachusetts wetlands rules and the Conservation Commission
Massachusetts has no "shoreland zoning" like some states. Instead, the Wetlands Protection Act (M.G.L. c. 131, §40) and MassDEP's regulations (310 CMR 10.00) control work near water, and your local Conservation Commission enforces them.
What's protected:
- Wetlands, banks, beaches, dunes, marshes, land under ponds and streams, and 100-year floodplains.
- The riverfront area: 200 feet from a perennial river or stream, shrinking to 25 feet in certain dense urban areas.
- The buffer zone: land within 100 feet of a wetland, bank, beach or similar resource area. Most work here needs Conservation Commission review.
How approval works:
- Contact the Conservation Commission before starting any work in these areas. That includes additions, decks, sheds, driveways, regrading and clearing vegetation.
- If you're unsure whether the law applies, file a Request for Determination of Applicability (RDA).
- If the work will affect a resource area, file a Notice of Intent (NOI) with plans and a fee. A public hearing follows, and the commission issues an Order of Conditions approving (with conditions) or denying the project.
- Applicants, abutters, groups of 10 residents or MassDEP can appeal to MassDEP.
Local bylaws can be stricter. Many towns have their own wetlands bylaw with larger buffers or no-build zones, and the Conservation Commission enforces those too.
What the bylaw says
- Ch. 13 Wetlands Bylaw, Section 3. Jurisdiction, Chapter 13 Winchester Wetlands Bylaw - town PDF, p. 4
Except as permitted by the commission or as provided in this bylaw no person shall remove, fill, dredge, alter, or build upon or within one hundred (100) feet of any freshwater wetland, wet meadow, bog, or swamp; within one hundred (100) feet of any bank; upon or within one hundred (100) feet of any lake, river, pond, stream;
- Ch. 13 Wetlands Bylaw, Section 6.1, Chapter 13 Winchester Wetlands Bylaw - town PDF, p. 5
6.1 No activity within the jurisdiction of this bylaw shall be performed without first receiving and complying with a permit as set forth in this bylaw.
- ConCom Regulations, The 25' Buffer, para. 1, Conservation Commission Regulations - The 25' Buffer to Wetlands and Waterways (approved May 27, 2025), p. 1
1. No alteration, including, but not limited to, removal of native vegetation, grading, operation of vehicles, paving, filling, excavating, and building of structures, shall be permitted in the 25’ buffer to freshwater wetlands, lakes, ponds, rivers and streams, except in the following situations.
- ConCom Regulations, The 25' Buffer, Conservation Commission Regulations - The 25' Buffer to Wetlands and Waterways (approved May 27, 2025), p. 2
Any development in the 100’ buffer zone to a wetland, lake, pond, river or stream shall result in a significant improvement over existing conditions in the 25’ buffer unless the existing buffer already is a buffer of native vegetation.
- ConCom Regulations, The 25' Buffer, para. 4, Conservation Commission Regulations - The 25' Buffer to Wetlands and Waterways (approved May 27, 2025), p. 2
4. Buffers of 50’ to 100’ may be required if conditions warrant.
- ConCom Tree Replacement Regulation, Conservation Commission Regulations - The 25' Buffer to Wetlands and Waterways (approved May 27, 2025), p. 3
As guidance, all trees with a 6” or greater total diameter at breast height (DBH or caliper inch) proposed for removal may be required to be replaced by trees with an equivalent total diameter.
- Ch. 13 Wetlands Bylaw, Section 8.4, Chapter 13 Winchester Wetlands Bylaw - town PDF, p. 6
8.4 A permit shall expire three (3) years from the date of issuance. A permit may be extended once for an additional one (1) year period.
- Sec. 8.1.5(1) Floodplain Overlay District, Zoning Bylaw (recodified April 30, 2018; amendments through Nov 2017 TM) - town PDF, p. 96
All new construction and substantial improvements to any structures must comply with the Massachusetts State Building Code, as amended, for construction within a floodplain designated as Zones A or AE on the Flood Insurance Rate Maps.