Bolthole Index

Middlesex County, Massachusetts

Building permits, zoning and septic rules in Town of Belmont, Massachusetts

Town of Belmont, Massachusetts requires a building permit for building work beyond ordinary repair; the town’s Inspector of Buildings enforces the Massachusetts State Building Code.12 Belmont publishes its own zoning bylaw and district map, and Belmont’s Board of Health must approve septic-system or cesspool replacement.34 Use Belmont’s municipal offices for property inside town, rather than Cambridge’s building office elsewhere in Middlesex County.5

At a glance

Building permits
Required for building work beyond ordinary repair1
Zoning
Town bylaw and map; dimensional requirements vary by district3
Septic replacement
Belmont Board of Health permission required4
Building permit fee
$15 per $1,000 of construction cost, rounded up to the nearest thousand; $50 minimum6
Owner-builder
Homeowner License Exemption Form required when the homeowner seeks the building permit7
Accessory dwelling
An ADU in a detached private garage must meet applicable dimensional requirements8

Who to call

Building permits

Belmont Building Division

Building permits, construction-code questions and building inspections within Belmont

617-993-2664

19 Moore Street 2nd Floor Belmont MA 02478

Zoning

Belmont Office of Planning & Building

Land-use guidance and Planning Board and Zoning Board of Appeals coordination

617-993-2650

[email protected]

19 Moore Street 2nd Floor Belmont MA 02478

Septic permits

Belmont Health Department / Board of Health

Contact for Board of Health septic-replacement permission and sewer-connection health approval

617-993-2720

19 Moore Street 2nd Floor Belmont MA 02478

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Town of Belmont means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Town of Belmont, MA?

Belmont requires a building permit for any building work beyond ordinary repair, and Belmont’s Inspector of Buildings enforces and interprets the Massachusetts State Building Code.12 Electrical, plumbing, gas, sheet-metal, street-opening or trench work may require separate approvals alongside the building permit.1 Belmont’s building permit fee is $15 per $1,000 of construction cost, rounded up to the nearest thousand, with a $50 minimum; separate trade and excavation permit fees may also apply.6 Ask the Building Division to clarify whether your proposed work qualifies as ordinary repair before treating that exception as permission to start.5

Who issues building permits in Town of Belmont, and who do you call?

Belmont’s Building Division oversees and inspects building construction within town; general building questions can go to 617-993-2664.5 Belmont’s Office of Planning & Building is at 19 Moore Street, 2nd Floor, Belmont MA 02478, with the office phone 617-993-2650 and email [email protected].9 The Planning Division staffs the Planning Board and Zoning Board of Appeals, making that office the starting point for questions about a proposed land use or zoning relief.9 A homeowner seeking a building permit for a single- or two-family residence must submit Belmont’s Homeowner License Exemption Form and comply with the town’s inspection procedures; homeowner status does not remove the building permit requirement.71

Does Town of Belmont have zoning, lot-size and setback rules?

Belmont publishes its own zoning bylaw and zoning map, and dimensional requirements vary by district.3 Start with the parcel’s Belmont district and ask Planning & Building for the applicable lot-size, setback and height provisions rather than applying a neighboring municipality’s dimensions.39 Belmont allows a detached private garage to include an accessory dwelling unit subject to the applicable dimensional requirements and additional or superseding ADU provisions.8 That garage-ADU provision does not establish a blanket answer for a stand-alone tiny house or a manufactured home; we could not confirm Belmont’s specific occupancy rules for those proposals, so describe the intended structure and use to Planning & Building before buying.89

How do septic approvals and sewer connections work in Town of Belmont?

Replacing a septic system or cesspool in Belmont requires permission from Belmont’s Board of Health.4 For a town sewer connection, the Board of Health request must be completed and stamped approved before a sanitary sewer permit can be issued.10 An existing septic tank or cesspool must be abandoned using the required state sanitary procedures when making the applicable sewer connection.10 Sewer work in the public right-of-way also requires a Street Opening Permit, and trenches exceeding 3 feet require a Trench Permit.10 Contact Belmont’s Health Department at 617-993-2720 about septic replacement or the health approval for a sewer connection; we could not confirm the complete local requirements for every new or modified septic system.114

Can you live in an RV or tiny home in Town of Belmont?

We could not confirm a Belmont rule expressly allowing or prohibiting RV occupancy on private land, temporary camping, or a minimum dwelling floor area; ask Planning & Building about the proposed use and address.9 Belmont’s published district rules and conditional garage-ADU provision are the confirmed starting points for a small dwelling proposal.38 Do not assume an ADU approval answers whether an RV can serve as housing during construction: ask Planning & Building to address temporary occupancy separately from the permanent building application.9 For a proposal involving off-grid sanitation or a private well, ask Belmont’s Health Department for the applicable local requirements; we could not confirm those Belmont-specific rules.11

What are the steps before building a home in Town of Belmont?

First, identify the parcel’s Belmont zoning district and review the district-specific dimensional rules with Planning & Building.39 Next, resolve the wastewater plan: Belmont Board of Health permission applies to septic replacement, and its stamped approval is needed before the applicable sanitary sewer permit.410 Then submit the building permit application and any required Homeowner License Exemption Form.17 During construction, arrange the required excavation, foundation, framing, insulation and final inspections; complex projects may need additional inspections.12 Before changing access beside Somerset Street, obtain Planning Board approval for a new or expanded opening in stone walls or adjacent tree work.13 For land elsewhere in Middlesex County, zoning depends on the municipality; Belmont’s district rules answer questions inside Belmont.143

Watch-outs

  • Belmont’s homeowner license exemption requires a form and compliance with inspection procedures; it does not waive the building permit.71
  • New or expanded driveway openings in stone walls or adjacent tree work on Somerset Street require Planning Board approval because Somerset Street is a scenic road.13
  • We could not confirm Belmont’s specific floodplain-development requirements; ask Planning & Building to identify the approvals needed for the parcel before buying.9

Sources

  1. Planning & Building (Town of Belmont), quoted and re-checked
  2. Planning & Building (Town of Belmont), quoted and re-checked
  3. Zoning By-Laws & Map (Town of Belmont), quoted and re-checked
  4. Sanitary Sewer & Storm Drain Regulations & Specifications (Town of Belmont), quoted and re-checked
  5. Belmont Building Division (belmont-ma.gov)
  6. Application Forms for Building Permits (Town of Belmont), quoted and re-checked
  7. Application Forms for Building Permits (Town of Belmont), quoted and re-checked
  8. Town of Belmont Zoning By-Law, Section 4 (Town of Belmont), quoted and re-checked
  9. Belmont Office of Planning & Building (belmont-ma.gov)
  10. Sanitary Sewer & Storm Drain Regulations & Specifications (Town of Belmont), quoted and re-checked
  11. Belmont Health Department / Board of Health (belmont-ma.gov)
  12. Application Forms for Building Permits (Town of Belmont), quoted and re-checked
  13. belmont-ma.gov (Town of Belmont), quoted and re-checked
  14. General Law - Chapter 40A, Section 5, quoted and re-checked

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Town of Belmont

Town of Belmont’s own rules

  • Building permitRequired

    Building work inside Belmont town beyond ordinary repair.

    • Ordinary repairs are excluded; additional permits may be needed for electrical, plumbing, gas, sheet-metal, street-opening, or trench work.
    “Any building work beyond the scope of ordinary repair requires a building permit.”
  • Owner-builder exemptionConditional

    Owner seeking a building permit or work on a single- or two-family residence inside Belmont town.

    • The Homeowner License Exemption Form is required if the contractor lacks a State Construction Supervisors License or the homeowner is seeking the building permit.
    • The form requires compliance with Belmont Building Department minimum inspection procedures and approval by the building official.
    “The Homeowner License Exemption Form (PDF) is required for work involving a single or two-family residence if: the contractor does not have a State Construction Supervisors License, or the homeowner is seeking the building permit.”
  • InspectionsRequired

    Permitted building construction inside Belmont town.

    • Minimum inspections include excavation, foundation, framing, insulation, and final; complex projects may require additional inspections.
    • The applicant must notify each inspector at least 24 hours in advance.
    “The following are the minimum inspections required; complex projects may require additional inspections.”
  • Zoning districtsPublished

    Zoning districts inside Belmont town.

    • Belmont publishes a complete zoning bylaw and zoning map; district-specific dimensional rules vary by district.
    “Zoning Map, as amended through November 19, 2024”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in accessory buildings on residential lots inside Belmont town.

    • The accessory building must comply with applicable dimensional requirements in Sections 4.2.1 and 4.2.2 and any additional or superseding requirements in Section 6.14.
    “a detached private garage may include a first or second story accessory dwelling unit provided that the accessory building complies with applicable dimensional requirements in Sections 4.2.1 and 4.2.2 herein as well as any additional or superseding dimensional requirements in Section 6.14.”
  • Who permits septicLocal (with conditions)

    Septic and cesspool matters inside Belmont town.

    • Belmont's Board of Health handles permissions and directs residents to Board of Health licensed professionals.
    “Replacing a septic system or cesspool requires permission by the Board of Health.”
  • Septic permitLimited

    Replacement of septic systems or cesspools inside Belmont town.

    • Board of Health permission is required before replacing a septic system or cesspool.
    • The source does not establish the complete permit requirements for every new or modified septic system.
    “Replacing a septic system or cesspool requires permission by the Board of Health.”
  • Mandatory utility hookupSewer (with conditions)

    Properties inside Belmont town connecting to or replacing a septic system with a Town sanitary sewer connection.

    • A Board of Health sewer-connection request must be completed and stamped approved before a sanitary sewer permit is issued.
    • Existing septic tanks or cesspools must be abandoned under Title 5 procedures.
    • A Street Opening Permit is required for work in the public right-of-way, and a Trench Permit is required for trenches exceeding 3 feet.
    “The request to the Board of Health for a Town sewer connection must be completed and a copy stamped approved must accompany this application before a sanitary sewer permit will be issued.”
  • Driveway accessLimited

    New or expanded driveway openings in the Somerset Street scenic-road area inside Belmont town.

    • The Planning Board must approve any new or expanded driveway opening in the stone walls or tree work adjacent to Somerset Street.
    “The Planning Board must approve any new or expanded driveway opening in the stone walls or tree work adjacent to Somerset Street, since this street is designated a "Scenic Road".”
  • Permit feesPublished (with conditions)

    Building permits inside Belmont town.

    • The building permit fee is based on $15 per $1,000 of construction cost, rounded up to the nearest thousand, with a $50 minimum.
    • Separate permit fees may apply for sheet metal, electrical, plumbing, gas, sewer, street opening, or trench permits.

    building permit fee: per 15 USD per $1,000 construction cost (Minimum fee $50; cost rounded up to nearest thousand.)

    “The Building Permit Fee (PDF) and Sheet Metal Permit (PDF) fees are based on $15 per $1,000 of construction cost (rounded up to the nearest thousand) with a minimum fee of $50.”

Rules another office applies inside Town of Belmont

Town of Belmont does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Building code adoptedAdopted (with conditions)

    Construction inside Belmont town limits under the Massachusetts State Building Code.

    • The state code is enforced and interpreted in Belmont by the Inspector of Buildings.
    “These construction activities are regulated by the Massachusetts State Building Code. The Code is enforced and interpreted in Belmont by the Inspector of Buildings.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Belmont or Middlesex County directly.

  • Minimum dwelling size — Residential dwellings inside Belmont town.
  • Living in an RV — RV occupancy on private land inside Belmont town.
  • Camping on your land — Temporary camping inside Belmont town.
  • Tiny homes — Tiny-home occupancy inside Belmont town.
  • Manufactured homes — Manufactured-home occupancy inside Belmont town.
7 more unanswered
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • Building in a floodplain
  • Short-term rentals

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 Belmont publishes no rule on the point, not that none exists. Middlesex County’s page lists the county offices to call.

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