Bolthole Index

Somerset County, New Jersey

Zoning, building permits and septic rules in Hillsborough Township, New Jersey

Hillsborough Township, New Jersey requires a construction permit for a new home, and the Township's own Building Department issues it under the state Uniform Construction Code, not Somerset County1. Zoning is also the Township's job, set by its Land Use and Development Ordinance2. Septic systems are reviewed by the Hillsborough Health Department3.

At a glance

Building permit
Required; issued by the Township Building Department14
Zoning
Township zoning under Chapter 188; the county does not zone25
Septic
Hillsborough Health Department reviews repairs; the board of health having jurisdiction certifies new systems36
RV living
Only flood-hazard-area RV limits confirmed; general camping rule not confirmed7
Owner-builder
Owner affidavit available; permit and inspections still required8
Wells
State well-drilling permit, issued through municipal or county health officials9

Who to call

Building permits

Hillsborough Township Building Department (Construction Official)

Construction permits, plan review and inspections under the New Jersey Uniform Construction Code

(908) 369-5882

Zoning

Hillsborough Township Planning & Zoning Department

Zoning permits, the Land Use and Development Ordinance and zoning map, and development applications

(908) 369-4313

379 South Branch Road Hillsborough, NJ 08844

Septic permits

Hillsborough Township Health Department

Septic system review and repair permits, well testing information and environmental health

908-369-5652

379 South Branch Road Hillsborough, NJ 08844

Contact details are copied from each office’s official page and were checked against it on October 13, 2026.

Off-grid gear

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

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Does Hillsborough Township, NJ have zoning, and what does it mean for lot size and setbacks?

Yes. Hillsborough Township manages and enforces its own Land Use and Development Ordinance, Chapter 188, and the Planning & Zoning Department processes zoning permits210. The Township keeps a zoning map of every zone and district11. Somerset County itself has no authority to zone, so the Township ordinance is the one that applies5.

Minimum lot size, setbacks and lot coverage are set district by district in New Jersey, so the answer depends on which zoning district a parcel sits in1213. Look up the parcel's district on the zoning map before you make an offer. We could not confirm a minimum dwelling size for Hillsborough's residential districts; ask the Planning & Zoning Department at (908) 369-431310.

Do you need a building permit in Hillsborough Township, and who issues it?

Yes. New Jersey requires a construction permit for new construction and for work on existing buildings such as structural, plumbing, mechanical and electrical work, with an exception for ordinary maintenance and routine repair14. In Hillsborough Township the Building Department under the Construction Official reviews plans, issues construction permits and inspects the work41.

The state code sets a deadline of 20 business days for a decision on a complete application14. Permit fees are set by each municipality's own ordinance, so ask the Township Building Department for its fee schedule15.

A homeowner who builds their own house still needs the permit and inspections; the owner files an affidavit with the construction official, and the home is not covered by the state new-home warranty8.

How do septic permits work in Hillsborough Township?

In New Jersey the board of health having jurisdiction must certify that the septic system complies with state standards before any building permit is issued6. In Hillsborough Township the Hillsborough Health Department reviews septic repair proposals, which must follow NJDEP inspection guidelines and the state septic code3. The Township's published process covers repair permits for existing systems; we could not confirm its steps for a brand-new system, so call the Health Department at 908-369-5652 first1617.

For a repair, a complete NJDEP onsite-system inspection with all tanks pumped is required18. The state also requires a board of health inspection before tanks and fields are covered19.

If a public sewer is available, a building within 250 feet of a Township or Hillsborough Municipal Utilities Authority sewer must connect when the Board of Health orders it20. Across Somerset County only 3.7% of soils rate as not limited for a conventional drain field, so expect a site evaluation21.

Can you live in an RV or tiny home on your land in Hillsborough Township?

We could not confirm a general rule for camping or living in an RV on private land in Hillsborough Township, and no official source we reviewed addresses tiny homes. The one RV rule we found covers flood hazard areas: an RV must be fully licensed, ready for highway use, and on the site for fewer than 180 consecutive days, and longer or unlicensed placement must meet habitable-building requirements7.

A mobile home may be placed temporarily only after a single-family dwelling is destroyed and uninhabitable, by a zoning permit for no more than eight months22. Park models are subject to the full Uniform Construction Code and need an installation permit23. Ask the Planning & Zoning Department before buying with an RV or tiny home in mind10.

Building a home in Hillsborough Township: the steps, in order

  1. Find the parcel's zoning district on the Township zoning map and confirm the use and dimensions with Planning & Zoning at (908) 369-43131110.
  2. Get septic approval from the Hillsborough Health Department, 908-369-5652, or confirm a sewer connection617.
  3. Apply to the Building Department, (908) 369-5882, for a construction permit; construction may begin only after plans are released and the permit is issued244.
  4. Request each inspection in writing through the SDL Portal or the Building webpage25.
  5. After final inspections pass, apply for a Certificate of Occupancy, which takes three to ten business days26.

What stays with Somerset County, and what to check before you buy?

Somerset County's planning board reviews subdivisions that affect county roads or drainage27, and a driveway onto a State highway needs a state access permit28. The county's own page covers land across Somerset County.

Somerset County's effective property tax rate is 1.9%29. Check floodplain status first, since Hillsborough's RV limits apply in flood hazard areas7.

Watch-outs

  • We could not confirm whether Hillsborough Township has a general well-permit rule or a driveway-access rule for local roads; ask the Health Department for wells and Planning & Zoning for driveways1710.
  • Inspection requests must be made in writing through the SDL Portal or the Building webpage, not by phone25.
  • State law lets a municipality be stricter than the Uniform Construction Code, never more lax, so Township requirements can exceed the state minimum30.

Sources

  1. NJ DCA - Uniform Construction Code (N.J.A.C. 5:23) (2026 county census)
  2. Planning & Zoning (Hillsborough Township), quoted and re-checked
  3. Septic System Inspections During Real Estate Transactions (Hillsborough Township), quoted and re-checked
  4. Hillsborough Township Building Department (Construction Official) (hillsboroughnj.gov)
  5. P.L. 2013, c.106 — Municipal Land Use Law amendments (New Jersey statewide rule), quoted and re-checked
  6. New Jersey Statutes, R.S. 58:11-23 through 58:11-43 (New Jersey statewide rule), quoted and re-checked
  7. Article XIII Recreational Vehicles (Hillsborough Township), quoted and re-checked
  8. N.J.A.C. 5:23, Uniform Construction Code (New Jersey statewide rule), quoted and re-checked
  9. Bulletin 88-10: Private On-Site Water Supply Systems (New Jersey statewide rule), quoted and re-checked
  10. Hillsborough Township Planning & Zoning Department (hillsboroughnj.gov)
  11. Planning & Zoning (Hillsborough Township), quoted and re-checked
  12. P.L. 2013, c.106 (Municipal Land Use Law amendments) (New Jersey statewide rule), quoted and re-checked
  13. P.L. 2013, c.106 (Municipal Land Use Law amendments) (New Jersey statewide rule), quoted and re-checked
  14. Uniform Construction Code General Information, quoted and re-checked
  15. New Jersey Uniform Construction Code General Information, quoted and re-checked
  16. Septic System Inspections During Real Estate Transactions (Hillsborough Township), quoted and re-checked
  17. Hillsborough Township Health Department (hillsboroughnj.gov)
  18. Septic System Inspections During Real Estate Transactions (Hillsborough Township), quoted and re-checked
  19. New Jersey Statutes, R.S. 58:11-23 through 58:11-43 (New Jersey statewide rule), quoted and re-checked
  20. Chapter 337 Sewers (Hillsborough Township), quoted and re-checked
  21. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  22. Article V: Districts and Standards (Hillsborough Township), quoted and re-checked
  23. New Jersey Administrative Code, N.J.A.C. 5:23-9.3, quoted and re-checked
  24. The New Jersey State Uniform Construction Code, quoted and re-checked
  25. Guideline for Business Permits (Hillsborough Township), quoted and re-checked
  26. Guideline for Business Permits (Hillsborough Township), quoted and re-checked
  27. New Jersey State Hazard Mitigation Plan Capability Assessment, quoted and re-checked
  28. Major Access Permits (New Jersey statewide rule), quoted and re-checked
  29. Effective property tax rate: Bolthole Index county data
  30. New Jersey State Hazard Mitigation Plan Capability Assessment, quoted and re-checked

Written October 13, 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 Hillsborough Township

Hillsborough Township’s own rules

  • InspectionsRequired

    Permitted construction inside Hillsborough Township.

    • All required inspections shown on the construction-permit inspection checklist must be scheduled.
    • Frame inspections follow rough plumbing, electrical, and fire inspections; final inspections may be conducted in any sequence.
    • Beginning May 20, 2024, inspection requests must be made by written notification through the SDL Portal or Building webpage.

    inspection-request effective date: 2024-05-20

    “All required inspections indicated on the inspection checklist (provided with your Construction Permit and released plans) must be scheduled.”
  • Certificate of occupancyRequired

    Occupancy of permitted business or other covered space inside Hillsborough Township.

    • All final inspections must pass first.
    • Final prior approvals must be submitted in writing before issuance.
    • The certificate takes three to ten business days to issue.
    • The certificate is required to occupy the space or open the business.

    issuance time: 3-10 business days

    “After all Final inspections have passed you must file an application for the Certificate of Occupancy or Temporary Certificate of Occupancy in the Building Department.”
  • Local zoningPresent

    Land inside Hillsborough Township; the Township manages and enforces its Land Use and Development Ordinance.

    • The ordinance is Chapter 188.
    “The Department also manages the Land Use and Development Ordinance (aka the “Zoning Ordinance”, see link below) by processing zoning permits and reviewing applications for development.”
  • Zoning districtsPublished

    Hillsborough Township zoning districts and zoning map.

    • The Township maintains a zoning map of all zones and districts.
    • The zoning ordinance is Chapter 188.
    “Hillsborough maintains a map of all zones and districts for the Township, known as a Zoning Map.”
  • Living in an RVLimited

    Recreational vehicles in Hillsborough Township flood hazard areas.

    • RV placement is not authorized in coastal high hazard areas or floodways.
    • In flood hazard areas, the RV must be fully licensed and ready for highway use and remain on site less than 180 consecutive days.
    • Unlicensed, not-highway-ready, or longer placement must meet habitable-building requirements.

    maximum temporary placement: < 180 consecutive days

    “Recreational vehicles in flood hazard areas shall be fully licensed and ready for highway use and shall be placed on a site for less than 180 consecutive days.”
  • Manufactured homesLimited

    Temporary mobile-home placement after partial or total destruction of a single-family dwelling.

    • The dwelling must be uninhabitable.
    • The Zoning Officer may issue a zoning permit for no more than eight months.
    • The Township Committee may extend the temporary use for one additional six-month period.
    • Placement requires inspection and approval by the Chief Construction Official.

    initial temporary period: <= 8 months · possible extension: 6 months (one additional period)

    “In the event of a partial or total destruction of a single-family dwelling, to the extent that the dwelling is uninhabitable, by resolution of the Township Committee, the Zoning Officer may issue a zoning permit allowing the temporary use of the mobile home on the affected lot for a period not to exceed eight months.”
  • Who permits septicLocal

    Septic-system review and repair permitting inside Hillsborough Township.

    • The Hillsborough Health Department reviews septic repair proposals.
    • Repairs must comply with NJDEP inspection guidelines and state septic code.
    “When a request for a repair permit has been received by the Hillsborough Health Department, the review process is as follows:”
  • Septic permitLimited

    Repair permits for existing septic systems inside Hillsborough Township.

    • The source addresses repair permits for existing systems, not every new-system permit.
    • Only repairs allowed under NJDEP septic code may be approved.
    • Some work is an alteration rather than a repair and must be directed by a professional engineer.
    “A request to repair an existing septic system may be made to the Hillsborough Health Department for existing systems.”
  • Septic inspectionLimited

    Inspection documentation submitted for septic repair review inside Hillsborough Township and inspections during real-estate transactions.

    • A complete NJDEP onsite-system inspection is required for repair consideration.
    • All tanks must be pumped and thoroughly inspected.
    • A report without all tanks pumped is incomplete and will not support repair approval.
    “Only a complete NJDEP Onsite System Inspection will be accepted for consideration for repair; a complete inspection requires that all tanks must be pumped and thoroughly inspected.”
  • Mandatory utility hookupSewer (with conditions)

    Buildings inside Hillsborough Township located within 250 feet of an available Township or Hillsborough Municipal Utilities Authority sewer.

    • Connection follows an order of the Hillsborough Township Board of Health.
    • The 250-foot distance is measured horizontally from the designated sewer connection point to the nearest part of the building.
    • Notice may provide 30 days after service when the connection date has passed.
    • The connection must comply with the Township plumbing code.

    sewer-distance threshold: <= 250 feet

    “The owner of any building located within 250 feet of any sewer now or hereafter constructed and owned or operated by the Township of Hillsborough or by the Township of Hillsborough Municipal Utilities Authority in the Township of Hillsborough shall connect each such building to said sewer on or before and not later than the connection date with respect to said building upon order of the Board of Health of Hillsborough Township.”
  • Permit processPartial

    Construction-permit inspection and certificate process inside Hillsborough Township.

    • Revised plans may need to be submitted to the Building Department for review.
    • Required inspections are scheduled through written notification.
    • Final inspections must pass before applying for a certificate of occupancy or temporary certificate of occupancy.
    • Final prior approvals must be submitted in writing before certificate issuance.
    “As of May 20, 2024, inspections need to be requested by written notification. Inspection requests may be submitted through the SDL Portal or on the Hillsborough Township Building Webpage.”

Rules another office applies inside Hillsborough Township

Hillsborough Township 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 Hillsborough Township under New Jersey’s Uniform Construction Code.

    • The current state page lists the 2024 International Building Code, New Jersey edition, under NJAC 5:23-3.14.
    • The adoption date stated by the source is August 17, 2026.

    building subcode: International Building Code/2024, NJ ed · adoption date: 2026-08-17

    “BUILDING SUBCODE (NJAC 5:23-3.14) International Building Code/2024, NJ ed [...] Aug 17, 2026”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Hillsborough Township or Somerset County directly.

  • Owner-builder exemption — Owner-builder exemption from construction-permit or contractor requirements inside Hillsborough Township.
  • Minimum dwelling size — Single-family dwellings in Hillsborough Township residential districts.
  • Camping on your land — Temporary camping on private land inside Hillsborough Township.
  • Tiny homes — Tiny-home occupancy inside Hillsborough Township.
  • Accessory dwellings — Accessory dwelling units inside Hillsborough Township.
6 more unanswered
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Driveway access
  • 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 Hillsborough Township publishes no rule on the point, not that none exists. Somerset County’s page lists the county offices to call.

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