Do I need a permit for a shed in Acton, Massachusetts?
Tool sheds are an allowed accessory use in Acton's residential districts, and you need a building permit only for a shed over 200 sq ft. Every shed, of any size, must meet zoning yard setbacks (for example 30 ft front and 10 ft side/rear in R-2, or 45 ft front and 20 ft side/rear in R-4 through R-10/8), plus wetland, septic and floodplain rules.
| Allowed use | Tool sheds permitted as an accessory use in residential districts [1] |
| Building permit threshold | Over 200 sq ft [2] |
| Setbacks apply to | Sheds of all sizes [3] |
| Front / side-rear setback, R-2 | 30 ft / 10 ft [4] |
| Front / side-rear setback, R-4, R-8, R-8/4, R-10, R-10/8 | 45 ft / 20 ft [4] |
| Max height (residential districts) | 36 ft [4] |
| Wetland bylaw setback for structures (incl. sheds) | 75 ft from the edge of wetlands [6] |
Allowed as an accessory use
Acton's Zoning Bylaw lists private garages, greenhouses, tool sheds and barns among the accessory uses allowed in residential districts [1]. A shed counts as a "structure" under the bylaw [5], so it has to meet the same yard setbacks as other buildings.
When you need a permit
The Building Department's shed handout says a building permit is only required for a shed over 200 sq ft. Even so, all sheds must comply with floodplain, zoning, wetland and septic setbacks [2]. For a permitted shed you'll apply online and submit a plot plan stamped by a registered land surveyor. A mortgage survey plan may be accepted case by case [8].
Setbacks
The Planning Department's setback guide (April 2019) lists "sheds of all sizes" among structures that must meet setbacks [3]. The current Table 1 of the Zoning Bylaw (May 2026) sets these minimums [4]:
- R-2: 30 ft front, 10 ft side and rear
- R-4, R-8, R-8/4, R-10, R-10/8: 45 ft front, 20 ft side and rear
- R-A and R-AA: 30 ft front, 10 ft side and rear; VR: 10 ft front and side/rear
A corner lot has two front yards, and both must meet the front setback [7]. Maximum height in the residential districts is 36 ft [4]. We found no separate size or lot-coverage cap for sheds in R-2 through R-10/8 (open space is "NR" there). R-A and R-AA require 35% open space and VR 20%.
Near wetlands
The Conservation Commission treats a shed as a "structure" for its wetland setbacks [9]. Acton's Wetland Protection Bylaw requires a 75-ft setback from the edge of wetlands for structures [6]. The Commission can waive this. Any work within 100 ft of a resource area also falls under its jurisdiction.
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Next steps
- Look up your zoning district on Acton's GIS viewer and mark the front, side and rear setbacks on a plot plan.
- Check for wetlands, streams or vernal pools within 100 ft and your septic system location; contact the Conservation Commission if near a wetland.
- If the shed is over 200 sq ft, apply for a building permit online with the Building Department (978-929-6633) with a surveyor-stamped plot plan showing the shed location.
Common questions
- Do I need a permit for a shed in Acton, Massachusetts?
- Only if it's over 200 sq ft. Acton's Building Department requires a building permit for a shed over 200 sq ft, applied for online with a plot plan stamped by a registered land surveyor. Every shed, of any size, must still meet zoning, wetland, septic and floodplain setbacks.
- How close to the property line can a shed be in Acton, MA?
- Sheds of all sizes must meet zoning setbacks: 30 ft front and 10 ft side/rear in R-2, R-A and R-AA; 45 ft front and 20 ft side/rear in R-4, R-8, R-8/4, R-10 and R-10/8; and 10 ft in VR. A corner lot has two front yards.
- Can I put a shed near a wetland in Acton, Massachusetts?
- Acton's Wetland Protection Bylaw requires a 75-ft setback from the edge of wetlands for structures, and the Conservation Commission treats a shed as a structure. The Commission can waive this, and any work within 100 ft of a resource area falls under its jurisdiction.
- Are sheds allowed in residential zones in Acton, MA?
- Yes. Acton's Zoning Bylaw lists tool sheds among the accessory uses allowed in residential districts. Maximum height in the residential districts is 36 ft, and we found no separate size or lot-coverage cap for sheds in R-2 through R-10/8.
Massachusetts building code rules for sheds
The Massachusetts State Building Code (780 CMR, 10th edition) sets when a shed needs a building permit. Your town's zoning sets where it can go.
- No building permit needed for a one-story detached accessory structure used as a tool or storage shed, playhouse or similar, if the floor area is 200 sq ft or less (Residential Code R105.2).
- Bigger sheds, or any with more than one story, need a building permit from your local building department.
- Also exempt from a building permit: detached decks of 200 sq ft or less that are no more than 30 inches above grade, and greenhouses covered only in plastic film.
- The exemption covers only the building permit. Electrical, plumbing or gas work in the shed still needs its own permits, and the shed still has to meet local zoning (setbacks, lot coverage, height). Many towns set accessory-structure setbacks even for small sheds.
- Wetlands: putting a shed in a wetland resource area or within 100 feet of a wetland (or 200 feet of a river) may require Conservation Commission approval first, whatever its size.
The 10th edition took effect October 11, 2024 and has been the only code in force since July 1, 2025.
What the bylaw says
- §3.8.1.1, Zoning Bylaw (revised up to and including the May 2026 Annual Town Meeting), p. 27
3.8.1.1 Private garages or carports; greenhouses; tool sheds; barns; swimming pools or tennis courts provided that such recreational facilities are used only by the residents and their guests.
- Building Permits for Residential Sheds, Building Department - Building Permits for Residential Sheds, p. 1
ALL sheds must comply with flood plain regulations, zoning, wetland, and septic system setbacks. A Building Permit is only required to build or install a shed that exceeds 200 square ft.
- Does my structure require setbacks? - YES column (April 2019), Planning Department Zoning Review - Setback Requirements for Residential Districts (April 2019), p. 1
DOES MY STRUCTURE REQUIRE SETBACKS? YES Covered stairs Sheds of all sizes Swimming pools
- Table 1 – Table of Standard Dimensional Regulations, Zoning Bylaw (revised up to and including the May 2026 Annual Town Meeting), p. 85
R-2 20,000 150 50 30 10 NR NR 36 R-4 40,000 175 50 45 20 NR NR 36 R-8 80,000 200 50 45 20 NR NR 36 R-8/4 80,000 200 50 45 20 NR NR 36 RESIDENTIAL R-10 100,000 250 50 45 20 NR NR 36 DISTRICTS R-10/8 100,000 250 50 45 20 NR NR 36 R-A 100,000 200 50 30 10 (3) 35% NR 36 R-AA 10,000 100 50 30 10 35% NR 36 VR 15,000 50 NR 10 10 20% NR 36
- §1.3.18 STRUCTURE, Zoning Bylaw (revised up to and including the May 2026 Annual Town Meeting), p. 10
1.3.18 STRUCTURE: A combination of materials assembled to give support or shelter, such as BUILDINGS, towers, masts, sheds, roofed storage areas, mechanical equipment, swimming pools, tennis courts, signs, fences; but not including driveways, walkways and other paved areas, underground storage tanks, septic tanks and septic systems, and accessory facilities associated with the provision of utilities such as drains, wells, transformers and telephone poles.
- Ch. F, F8.3 Setbacks for Activities, General Bylaws of the Town of Acton (updated September 2026), p. 46
(3) 75-foot setback to the edge of driveways, roadways, and structures.
- Section 5.2.4 Front Yards, Planning Department Zoning Review - Setback Requirements for Residential Districts (April 2019), p. 6
A LOT having FRONTAGE on two or more STREETS shall have two or more front yards, each of which shall comply with the minimum required front yard.
- Building Permits for Residential Sheds – requirements, Building Department - Building Permits for Residential Sheds, p. 1
Plot plan must be stamped by a registered land surveyor. A mortgage survey plan may be acceptable depending on proposed setback and is reviewed on a case by case basis
- Guidance: meaning of 'structure' (April 17, 2019), Conservation Commission guidance: meaning of 'structure' in the Acton Wetland Bylaw (approved April 17, 2019), p. 1
Structure: Anything which is built or constructed, including but not limited to the following, whether permanent or temporary: building, including eaves, overhangs, and gutters; shed; stairway; above or below ground swimming pool; roofed storage area; garage; car port; free standing wall taller than 4’; retaining wall; concrete pad larger than 50 SF(1); patio larger than 200 sf(1); deck larger than 200 sf (1); riprap greater than 100sf (1); terrace; parking lot; above or below ground storage tank; non-portable barbecue; non-portable fire pit; tennis court; and all parts of an above or below ground stormwater facility including but not limited to deten- tion/retention basin.