Zoning, building permits and septic rules in Town of Smithtown, New York

Town of Smithtown’s own rules

• Building permitRequired

  Erection, construction, enlargement, alteration, removal, improvement, demolition, conversion, or changed occupancy or use of a building, structure, or site inside Smithtown.

  • Ordinary nonstructural repairs are excepted.
  • A detached accessory storage or tool shed for a one- or two-family dwelling is excepted only if it is no more than 144 square feet, no more than 12 feet high, and in a conforming property location.

  accessory shed gross floor area: <= 144 square feet (Only the stated detached residential storage/tool-shed exception.) · accessory shed height: <= 12 feet (Only the stated detached residential storage/tool-shed exception.)

  “No person, firm or corporation shall commence the erection, construction, enlargement, alteration, removal, improvement, demolition, conversion or change in the nature of the occupancy [...]”

• Building code adoptedAdopted (with conditions)

  Construction subject to the Town of Smithtown Building Code.

  • The Town also adopts the Energy Conservation and Construction Code of New York State in its entirety; that section became effective immediately upon filing with the New York Secretary of State.

  “The Town Board of the Town of Smithtown hereby adopts the applicability of the New York State Uniform Fire Prevention and Building Code in its entirety.”

• Local zoningPresent (with conditions)

  Land inside the Town of Smithtown.

  • Zoning compliance is administered under Town Code Chapter 322.

  “Chapter 322: Zoning - Town of Smithtown, NY”

• Permit processPublished (with conditions)

  Applications for Town building permits.

  • Applications may be made by the owner, lessee, their agent, or the architect, engineer, or builder employed for the work; a non-owner applicant must provide the stated owner/applicant affidavit.
  • Plans and specifications may be waived by the Chief Building Inspector for minor alterations.
  • A New York licensed architect or professional-engineer seal is required where Education Law § 7302 requires it.

  “Application for a building permit shall be made to the Chief Building Inspector on forms provided by him and shall contain the following information:”

Still unanswered

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

• Owner-builder exemption — Owner-built residential construction inside Smithtown.
• Inspections — Building work inside Smithtown.
• Certificate of occupancy — Occupancy of buildings inside Smithtown.
• Zoning districts — Zoning districts inside Smithtown.
• Minimum dwelling size — Single-family residential zoning districts inside Smithtown.

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.

Off-grid gear

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

• Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
• Power Bluetti Solar generators and home battery backup for living off the grid.
• Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
• Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.

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