Zoning, building permits and septic rules in Town of Avon, Massachusetts
Town of Avon is a town in Norfolk County, Massachusetts. Town of Avon adopts its own zoning, so inside its limits Town of Avon’s rules apply, not the county’s. Septic permits inside Town of Avon come from Town of Avon. 5 rules below are quoted from official sources and independently re-checked, most recently on October 23, 2026. Rules for unincorporated land are on the Norfolk County page.
Answers from the rulebook for Town of Avon
Town of Avon’s own rules
Local zoningPresent (with conditions)
Land inside Avon town limits: the town's own zoning bylaw (Code Chapter 255, Zoning) governs use and dimensional rules there.
The zoning bylaw dates to May 17, 1977 and has been amended; the eCode360 Chapter 255 text itself was not opened in this research pass.
Zoning map is stated as amended through October 7, 2025 (STM Art. 4); a further revised map was noted on the town site as proposed for STM 10/7/2025 and was not verified as adopted.
Special permits and variances are handled by the Zoning Board of Appeals per the town's site.
“with the exception of the zoning bylaw adopted may 17, 1977, and as amended, which shall remain in full force and effect.”
Minimum lot sizeSpecified
Land inside Avon town limits in the Residence A district (the main residence district on the town zoning map).
Figure is the lot size shown in the zoning map legend; the Chapter 255 dimensional table was not opened to confirm it.
Lot size is a district requirement only; setbacks, frontage and other dimensional rules were not verified.
minimum lot area: 25000 sq ft
“residence districts business district residence a (25,000 sq. ft. lots) commercial district residence b (40,000 sq. ft. lots)”
One more reviewed finding on this topic
Specified — Land inside Avon town limits in the Residence B district (the lower-density residence district on the town zoning map).
“residence districts business district residence a (25,000 sq. ft. lots) commercial district residence b (40,000 sq. ft. lots)”
Who permits septicLocal (with conditions)
Septic systems on land inside Avon town limits: the Avon Board of Health handles Title 5 (310 CMR 15.00) inspections and related septic determinations.
State Title 5 standards (310 CMR 15.00) apply; the local Board of Health administers them.
Septic repair or upgrade timing and Board of Health fees/forms were not verified.
“if our office has records, then the health agent can determine if the proposed addition meets the required setbacks and if the septic system has the capacity to handle the additional design flow for the proposed addition.”
Septic inspectionLimited
Septic systems serving residential additions or alterations inside Avon town limits
Inspection is required where the Board of Health has no records showing the septic system's location and capacity.
Where records exist, the Health Agent can determine whether a proposed addition meets setbacks and whether the system can handle the added design flow.
Title 5 inspection is also required when a property is sold and the seller's name does not remain on title (per the Board of Health FAQ, citing 310 CMR 15.00).
“the regulations require an inspection if there are no records available to the board of health that show the location and capacity of the septic system.”
Still unanswered
We looked and could not find an official answer yet. Silence is not permission; ask Town of Avon or Norfolk County directly.
Building permit — New construction inside Avon town limits
Owner-builder exemption — Owner-builder construction inside Avon town limits
Building code adopted — Building construction inside Avon town limits
Inspections — Building inspections inside Avon town limits
Certificate of occupancy — Certificate of occupancy for new homes inside Avon town limits
20 more unanswered
Minimum dwelling size
Setbacks
Lot coverage
Building height
Living in an RV
Camping on your land
Tiny homes
Manufactured homes
Accessory dwellings
Septic permit
Off-grid sanitation
Well permit
Mandatory utility hookup
Agricultural exemption
Subdividing land
Driveway access
Building in a floodplain
Short-term rentals
Permit fees
Permit process
Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.
Unanswered questions are usually a sign that Town of Avon publishes no rule on the point, not that none exists. Norfolk County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Town of Avon means bringing your own water and power. The kit we’d start with:
