Building near the water in Sudbury, Massachusetts (wetlands rules)
Work near water in Sudbury needs a permit from the Conservation Commission under the town's Wetlands Administration Bylaw, which covers land within 100 feet of wetlands, ponds and streams and 200 feet of perennial streams and rivers. The Commission starts from the presumption that this buffer is best left undisturbed and can require a strip of untouched vegetation. In the Flood Plain Overlay District, new or enlarged structures are prohibited unless the Zoning Board of Appeals grants a special permit.
| Who approves | Sudbury Conservation Commission (permit after public hearing) [1] |
| Buffer (adjacent upland resource area) | 100 feet from wetlands; 200 feet from top of bank of perennial streams and rivers [2] |
| Undisturbed vegetation | Commission may require a continuous undisturbed vegetated strip in the buffer [3] |
| Existing single-family homes | Local bylaw permit not required to repair, replace or enlarge a lawful house in service before July 27, 1994 (state law may still apply) [8] |
| Tree removal | Arborist report or restoration planting plan; branches over dwellings can be trimmed without a permit [5] |
| Flood Plain Overlay District | Structures prohibited except fences, paths and similar items, or by ZBA special permit [6] |
| Permit fee (minor residential project) | $25 [7] |
What areas are covered
Sudbury's Wetlands Administration Bylaw (General Bylaws Article XXII) bans removing, filling, dredging, building on or otherwise altering wetlands, ponds, streams, vernal pools, land subject to flooding and certain adjacent upland areas without a Conservation Commission permit [1]. The adjacent upland resource area is 100 feet from wetland resource areas and 200 feet from the top of bank of perennial streams and rivers [2]. Smaller buffers apply to some vernal pools, small ponds and isolated flood areas.
How the Commission decides
The Commission treats land within these distances as presumptively important and may require a strip of continuous, undisturbed vegetative cover in all or part of the buffer [3]. Its regulations say work within 100 feet of wetlands "should be avoided and discouraged" and the Commission begins with the presumption that the buffer is best left undisturbed. It can designate no-disturbance, temporary, limited and permanent disturbance areas. Permits expire after three years.
Existing homes and additions
The local bylaw permit isn't required to maintain, repair, replace or enlarge an existing, lawfully located single-family house or its appurtenances, unless state or federal law requires a filing [4]. The Commission's regulations define "existing" as placed in service before July 27, 1994, so newer houses and entirely new structures don't get this exemption [8]. Work within 100 feet of a wetland or 200 feet of a river may still need state Wetlands Protection Act review by the same Commission. Under zoning, a nonconforming single-family house can be expanded if the Building Inspector finds the change doesn't increase the nonconformity.
Trees and clearing
To remove trees in a resource or buffer area, submit a licensed arborist's report for hazard trees, or a restoration planting plan for healthy trees. You may trim branches directly overhanging your house without a permit [5].
Flood plain
In the Flood Plain Overlay District, no building, wall, dam or other structure may be built, altered or enlarged. Fences, foot paths and similar items accessory to a home are allowed [6], and the Zoning Board of Appeals may grant a special permit for other structures if it finds no risk of pollution or loss of flood storage [9].
Fees
A minor residential project (addition, pool, tennis court) has a $25 local filing fee [7], in addition to any state filing fee.
The Wetlands Bylaw text is from the 2023 General Bylaws PDF and the regulations from 2017; check with the Commission for later changes.
Next steps
- Check whether your work is within 100 feet of a wetland, pond or stream (200 feet of a perennial stream or river) or in the Flood Plain Overlay District.
- If unsure, file a Request for Determination with the Sudbury Conservation Commission (no local fee).
- If jurisdictional, file a permit application (and Notice of Intent under the state Wetlands Protection Act) with plans showing all resource areas within 100 feet of your property lines (200 feet for perennial streams).
- Attend the public hearing and follow the conditions in the permit; get the Building Department permit afterward.
Common questions
- Do I need a permit to build near a wetland or stream in Sudbury, Massachusetts?
- Yes. Work near water needs a Conservation Commission permit under the Wetlands Administration Bylaw, covering land within 100 feet of wetlands and ponds and 200 feet of perennial streams and rivers.
- Can I clear vegetation near a wetland in Sudbury, Massachusetts?
- The Commission presumes the buffer is best left undisturbed and can require a continuous strip of untouched vegetation.
- Can I build in a floodplain in Sudbury, Massachusetts?
- In the Flood Plain Overlay District, new or enlarged structures are prohibited unless the Zoning Board of Appeals grants a special permit. Fences, paths and similar items are excepted.
- Can I enlarge an existing house near wetlands in Sudbury, Massachusetts?
- A local bylaw permit isn't required to repair, replace or enlarge a lawful house in service before July 27, 1994, though state law may still apply.
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
- Article XXII, Section 2 Jurisdiction, General Bylaws Articles I-XXXIX (effective September 6, 2023) - town PDF, p. 94
In accordance with this purpose no person shall remove, fill, dredge, build upon, degrade, pollute, discharge into, or otherwise alter the following resource areas: any freshwater wetland; marshes; wet meadows; bogs; swamps; vernal pools; banks; reservoirs; lakes; ponds; rivers; streams; creeks; lands under waterbodies; lands subject to flooding by ground water, surface water, or storm flow (collectively the "wetland resource areas protected by this bylaw"); and certain adjacent upland areas (collectively “the adjacent upland resource areas protected by this Bylaw”) as described in Section 9. Definitions, without a permit from the Conservation Commission, or as provided by this Bylaw.
- Article XXII, Section 9 Definitions, General Bylaws Articles I-XXXIX (effective September 6, 2023) - town PDF, p. 100
The term “adjacent upland resource area” shall include all lands within 100 feet of wetland resource areas as enumerated in Section 2, except for perennial streams and rivers for which the adjacent upland resource area extends for 200 feet from the top of bank, and except for vernal pools, ponds under 10,000 square feet in area, and isolated land subject to flooding for which special adjacent upland resource area definitions are described below.
- Article XXII, Section 7 Permits and Conditions, General Bylaws Articles I-XXXIX (effective September 6, 2023) - town PDF, p. 99
The Commission therefore may require that the applicant maintain a strip of continuous, undisturbed vegetative cover in part or all of the adjacent upland resource area and set other conditions on this area, unless the applicant provides evidence deemed sufficient by the Commission that the area or part of it may be disturbed without harm to the values protected by the law.
- Article XXII, Section 3 Conditional Exceptions, General Bylaws Articles I-XXXIX (effective September 6, 2023) - town PDF, p. 94
The application and permit required by this bylaw shall not be required for maintaining, repairing, replacing or enlarging an existing and lawfully located single-family residential structure or appurtenance thereto unless such filing is otherwise required by state or federal law.
- Wetlands Regulations §7.14 Tree Removal Performance Standards, Sudbury Wetlands Administration Bylaw Regulations (revised September 25, 2017), p. 18
Property owners may trim tree branches directly overhanging dwellings without a permit.
- Zoning Bylaw Sec. 4141 Flood Plain Overlay District, Zoning Bylaw, Article IX (effective May 3, 2023) - town PDF, p. 54
4141. No building, wall, dam or other structure shall be erected, constructed, altered, enlarged or otherwise created or moved for any living or other purpose, provided that tents, fences, wildlife management shelters, foot paths, bicycle paths, horse paths, and foot bridges are permitted if (i) they are accessory to lawful primary uses in a single residence district and (ii) they do not affect the natural flow patterns of any watercourse.
- Article XXII, Section 4 filing fees, General Bylaws Articles I-XXXIX (effective September 6, 2023) - town PDF, p. 95
(a) Single minor project -- i.e., house addition, tennis court, swimming pool, or other accessory residential activity $25 per project
- Wetlands Regulations §3.1.1 Definition and Application of the Term "Existing", Sudbury Wetlands Administration Bylaw Regulations (revised September 25, 2017), p. 7
The term "existing" refers to structures placed in service prior to July 27, 1994, and refers to both the single family structure and any appurtenance claiming exemption.
- Zoning Bylaw Sec. 4166, Zoning Bylaw, Article IX (effective May 3, 2023) - town PDF, p. 56
4166. Any other filling, excavating or transferring of any material, or erection, construction, alteration, enlargement, removal or demolition of any structure, upon the condition that with respect to each such action and structure the Board of Appeals determines that granting a special permit therefore would not result in any risk of pollution or contamination of any waterway or pond, reduction of seasonal high water storage areas, reduction of ground water absorption areas which serve the public water supply or other derogation from the intent and