Bolthole Index

Hunterdon County, New Jersey

Zoning, building permits and septic rules in the Borough of Frenchtown, New Jersey

The Borough of Frenchtown, New Jersey requires building permits for construction1, and the borough lists its Construction Department at 18 York Street, Lambertville2. Frenchtown adopts and administers its own zoning, because New Jersey counties do not zone34. Septic design review and inspections in Hunterdon County come from the county Office of Environmental Health5.

At a glance

Building permit
Required for construction inside the borough1
Who issues it
Construction Department, 18 York Street, Lambertville2
Zoning
Borough-run, with R-1 through R-7 and other districts36
Septic
Hunterdon County Office of Environmental Health5
RV living
Prohibited on a lot, with disaster-housing and construction-trailer exceptions7
Manufactured home
Allowed with conditions, at least 22 feet wide on a permanent foundation8
Owner-builder
Owner affidavit required before a certificate of occupancy9

Who to call

Building permits

Frenchtown Borough Construction Department

Questions about what needs a construction permit and permit status for work inside Frenchtown

609-397-0110

[email protected]

18 York Street, Lambertville, NJ 08530

Zoning

Frenchtown Borough zoning questions and inspection scheduling

Zoning applications, fences, property lines, violations and accessory structures inside Frenchtown

609-397-0110

[email protected]

18 York Street, Lambertville, NJ 08530

Septic permits

Hunterdon County Health Department, Office of Environmental Health

Septic design review, installation inspection and certification for Hunterdon County

908-788-1351

[email protected]

314 State Route 12, Building #, Flemington, NJ 08822

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

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

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Does Frenchtown, NJ have zoning, and what does it mean for RVs, tiny homes, lot size and setbacks?

Yes. The Borough of Frenchtown adopts and administers its own zoning ordinance, and Hunterdon County does not set zoning for the borough34. The borough is divided into districts, among them R-1 low-density residential, R-3 multifamily, R-4a central commercial, R-5 low-impact industrial and R-7 conservation/open space6.

In the R-1 district, a new principal home needs a lot of at least 1 acre without sewer, or 33,000 square feet where sewer is available10. Front setbacks in R-1 are 75 feet without sewer and 60 feet with sewer, and buildings plus paved surfaces together may cover no more than 15 percent of the lot1112. A principal building in R-1 may be 35 feet tall13.

Living in a travel trailer, camper or motor home on a Frenchtown lot is prohibited; the code makes exceptions for emergency housing after a fire, storm or flood and for construction trailers7. A manufactured home is allowed as a single-family dwelling if it is at least 22 feet wide, on a permanent foundation, and on land the owner holds in fee8. We could not confirm a tiny-home rule or an accessory dwelling rule; ask the zoning contact below.

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

Yes. Construction of buildings and accessory structures inside the Borough of Frenchtown needs a construction permit, and a permit for an accessory building cannot issue before the permit for the main building on the same lot, except for construction trailers, storage sheds and farm accessory buildings1. Frenchtown adopts the state Uniform Construction Code by reference, and New Jersey law makes it unlawful to build, alter or change the use of a structure without first filing an application and obtaining the required permit1415.

The borough's directory lists its Construction Department at 18 York Street, Lambertville, NJ 08530, for questions about what needs a construction permit and for permit status2. Zoning applications, fences, property lines and accessory structures go to the same contact16. The Hunterdon County rules for unincorporated land do not apply inside the borough; the county's own pages say municipal construction and zoning permits are handled at the municipal level17. The borough's published fee amounts were not available to us, so ask the Construction Department for the current schedule18.

How do septic permits work inside Frenchtown?

Septic permits are not issued by the borough's construction office. Hunterdon County Environmental Health performs septic design review, site and installation inspections and certification of completed systems5. The county provides the application for a permit to construct, alter or repair an individual subsurface sewage disposal system, and the health department must certify or approve the septic plan before a building construction permit is issued19. New Jersey law also bars a building permit until the board of health certifies the water supply and sewerage plans20.

Much of the borough may not need a septic system at all. Owners of buildings on a street along a borough sewer line must connect within 90 days after sewer service becomes available, and any connection needs a written permit from the borough2122. We could not confirm which Frenchtown streets have sewer or whether the county handles every on-site system inside the borough, so call Hunterdon County Environmental Health before you rely on either answer23. County-wide, USDA rates only about 10 percent of soils as not limited for a conventional drain field, so expect a site evaluation and possibly an engineered system24.

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

No, not in an RV. Frenchtown prohibits using travel trailers, campers, motor homes and similar vehicles as temporary or permanent living quarters while parked on a lot7. Vehicles may be parked or stored on a residential lot only in a side or rear yard7.

The code allows two exceptions: emergency trailer housing for a household displaced by fire, storm or flooding while its home is rebuilt, and construction or sales-office trailers7. We did not find a tiny-home rule in the borough code, so a tiny home on wheels should be treated like an RV until the zoning contact says otherwise. A manufactured home on a permanent foundation is a different case and is allowed under the conditions above8.

Building a home in Frenchtown: the steps, in order

  1. Confirm the zoning district and the lot standards with the zoning contact before you buy166.
  2. Find out whether the lot is on borough sewer or needs a septic system; septic plans go to Hunterdon County Environmental Health1923.
  3. Get septic plan approval, which comes before the building permit20.
  4. Apply for the construction permit through the Construction Department; zoning approval comes before the construction permit225.
  5. Schedule the periodic inspections New Jersey requires, such as footings, rough plumbing and electrical, and framing26.
  6. Have septic work inspected before it is covered27.
  7. Obtain the certificate of occupancy after final inspections; an owner who built the home must file an affidavit with the construction official first289.

What stays with Hunterdon County, and what to check before you buy in Frenchtown?

Septic review and inspections stay with Hunterdon County Environmental Health, and the county reviews subdivisions before local approval529. For land outside the borough, see the Hunterdon County page.

A driveway onto a state highway needs an access permit from the state, not the borough30. Wells need a state drilling permit plus a well construction permit from municipal or county health officials31. Hunterdon County's effective property tax rate is 2 percent, with a median bill of $10,001 a year3233.

Watch-outs

  • Frenchtown's borough code both adopts the state Uniform Construction Code locally and refers to jurisdiction passing to the state Department of Community Affairs, so confirm with the Construction Department who reviews your permit application14.
  • We could not confirm the borough's flood-area rules, driveway standards or minimum home size for R-1, so ask the zoning contact before you commit to a lot16.
  • Owner-builders are exempt only from new-home builder registration, not from permits or inspections34.

Sources

  1. Chapter 50 Land Use, Article III General Regulations (eCode360) (Borough of Frenchtown), quoted and re-checked
  2. Frenchtown Borough Construction Department (frenchtownboro.com)
  3. Chapter 50 Land Use, Article II Zones, Zoning Map and Schedule (eCode360) (Borough of Frenchtown), quoted and re-checked
  4. P.L. 2013, c.106 — Municipal Land Use Law amendments (New Jersey statewide rule), quoted and re-checked
  5. Septic Disposal Systems, quoted and re-checked
  6. Chapter 50 Land Use, Article II Zones, Zoning Map and Schedule (eCode360) (Borough of Frenchtown), quoted and re-checked
  7. Chapter 50 Land Use, Article III General Regulations (eCode360) (Borough of Frenchtown), quoted and re-checked
  8. Chapter 50 Land Use, Article III General Regulations (eCode360) (Borough of Frenchtown), quoted and re-checked
  9. N.J.A.C. 5:23, Uniform Construction Code (New Jersey statewide rule), quoted and re-checked
  10. Chapter 50 Land Use, Article II Zones, Zoning Map and Schedule (eCode360) (Borough of Frenchtown), quoted and re-checked
  11. Chapter 50 Land Use, Article II Zones, Zoning Map and Schedule (eCode360) (Borough of Frenchtown), quoted and re-checked
  12. Chapter 50 Land Use, Article II Zones, Zoning Map and Schedule (eCode360) (Borough of Frenchtown), quoted and re-checked
  13. Chapter 50 Land Use, Article II Zones, Zoning Map and Schedule (eCode360) (Borough of Frenchtown), quoted and re-checked
  14. Chapter 12 Building and Housing (eCode360) (Borough of Frenchtown), quoted and re-checked
  15. N.J.A.C. 5:23-2.14, Construction permits—when required (New Jersey statewide rule), quoted and re-checked
  16. Frenchtown Borough zoning questions and inspection scheduling (frenchtownboro.com)
  17. Open Public Records Act (OPRA), quoted and re-checked
  18. ecode360.com (Borough of Frenchtown), quoted and re-checked
  19. Septic Disposal Systems, quoted and re-checked
  20. New Jersey Statutes, R.S. 58:11-23 through 58:11-43 (New Jersey statewide rule), quoted and re-checked
  21. Chapter 16 Sewers (eCode360) (Borough of Frenchtown), quoted and re-checked
  22. Chapter 16 Sewers (eCode360) (Borough of Frenchtown), quoted and re-checked
  23. Hunterdon County Health Department, Office of Environmental Health (co.hunterdon.nj.us)
  24. 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
  25. New Jersey Uniform Construction Code, N.J.A.C. 5:23 (New Jersey statewide rule), quoted and re-checked
  26. New Jersey Department of Community Affairs, New Home Warranty—Consumer Information (New Jersey statewide rule), quoted and re-checked
  27. New Jersey Statutes, R.S. 58:11-23 through 58:11-43 (New Jersey statewide rule), quoted and re-checked
  28. Construction Code FAQs for New Home Buyers, quoted and re-checked
  29. County Land Development Standards, quoted and re-checked
  30. Major Access Permits (New Jersey statewide rule), quoted and re-checked
  31. Bulletin 88-10: Private On-Site Water Supply Systems (New Jersey statewide rule), quoted and re-checked
  32. Effective property tax rate: Bolthole Index county data
  33. Median property tax bill: Bolthole Index county data
  34. Construction Code FAQs for New Home Buyers, quoted and re-checked

Written October 24, 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 Borough of Frenchtown

Borough of Frenchtown’s own rules

  • Building permitRequired

    Construction of buildings and accessory structures inside Frenchtown borough.

    • Accessory building permits cannot issue before the main building construction permit.
    • Permit fee detail is in Chapter 12 § 12-2.3 (text not opened in this run).
    “no construction permit shall be issued for the construction of an accessory building or structure, other than construction trailers, storage sheds or farm accessory buildings prior to the issuance of a construction permit for the construction of the main building upon the same premises.”
  • Building code adoptedAdopted (with conditions)

    Construction in Frenchtown borough: state Uniform Construction Code adopted by reference by the borough.

    • Section 12-1.1 relinquishes local UCC jurisdiction to the NJ Department of Community Affairs, effective 120 days after transmittal or when DCA exercises jurisdiction, whichever is sooner; the transmittal date was not found in the opened text.
    • Section 12-2.1 separately establishes the Frenchtown Borough Construction Department as the enforcing agency.
    “there is hereby adopted, by reference, the state uniform construction code act of new jersey, p.l. 1975, c. 217 (n.j.s.a. 52:27d-119 et seq.) as may be amended, and the construction official and all subcode officials shall enforce the state uniform construction code”
  • Local zoningPresent (with conditions)

    Land inside Frenchtown borough limits; Frenchtown borough adopts and administers its own zoning ordinance (Chapter 50 Land Use).

    • Zoning is administered by the borough; zoning permit precedes construction permit per Chapter 50 Article VIII (not opened in this run).
    “the borough of frenchtown is hereby divided into zones as follows: r-1 low-density residential zone r-2 medium-density residential zone r-3 multifamily residential zone”
  • Zoning districtsPublished

    Zone list for land inside Frenchtown borough limits.

    • Zones listed in § 50-201 include R-1, R-2, R-3, R-4a, R-4b, R-4c, R-5, R-6, R-7; R-8a through R-8e and the Frenchtown Village Center plan also appear in the Chapter 50 table of contents.
    “r-4a central commercial zone r-4b transitional commercial zone r-4c satellite commercial zone r-5 low-impact industrial zone r-6 planned retirement village zone r-7 conservation/open space zone”
  • Minimum lot sizeDistrict specific (with conditions)

    Principal single-family dwelling in the R-1 Low-Density Residential zone inside Frenchtown borough (the main residential and agricultural district).

    • The schedule applies to new construction (§ 50-203 note a).
    • Two columns: R-1 without sewer and R-1 with sewer; the sewer column applies where sewer is available.
    • The schedule states that see article iv for additional requirements for R-1 and other zones.

    minimum lot area, R-1 without sewer: 43560 square feet (1 acre) · minimum lot area, R-1 with sewer: 33000 square feet · minimum lot width, R-1 without sewer: 170 feet · minimum lot width, R-1 with sewer: 150 feet · minimum lot depth, R-1 without sewer: 250 feet · minimum lot depth, R-1 with sewer: 220 feet

    “minimum lot width (feet) 170 150 100 300 100 minimum lot depth (feet) 250 220 150 350 150 minimum lot area (square feet) 43,560 (1 acre) 33,000 15,000 217,800 (5 acres) 15,000”
  • SetbacksDistrict specific (with conditions)

    Principal and accessory structures in the R-1 Low-Density Residential zone inside Frenchtown borough.

    • Standards apply to new construction (§ 50-203 note a).
    • Front yard measured from street line; the R-1 without-sewer and with-sewer columns differ.

    minimum front yard setback, R-1 without sewer: 75 feet (measured from street line) · minimum front yard setback, R-1 with sewer: 60 feet (measured from street line) · minimum side yard, principal, R-1 without sewer: 35 feet · minimum side yard, principal, R-1 with sewer: 30 feet · minimum rear yard, principal, R-1 without sewer: 50 feet · minimum rear yard, principal, R-1 with sewer: 50 feet · minimum side yard, accessory, R-1 (both columns): 15 feet · minimum rear yard, accessory, R-1 (both columns): 15 feet

    “minimum rear yard (feet) 50 50 25 75 25 minimum side yard (feet) 35 30 10 40/100 25 minimum front yard setback line (feet) measured from street line 75 60 5 3 75 50 accessory structures minimum side yard (feet) 15 15 5 — 25 minimum rear yard (feet) 15 15 5 — 25”
  • Lot coverageDistrict specific (with conditions)

    R-1 Low-Density Residential zone inside Frenchtown borough.

    • Note 1 of the schedule: includes all principal and accessory buildings as well as all impervious surfaces.

    maximum impervious surface coverage, R-1 without sewer: 15 percent (includes all principal and accessory buildings and all impervious surfaces) · maximum impervious surface coverage, R-1 with sewer: 15 percent

    “maximum impervious surface coverage 1 15% 15% 25% 35% 70%”
  • Building heightDistrict specific (with conditions)

    Principal buildings in the R-1 Low-Density Residential zone inside Frenchtown borough.

    • Accessory structure height is also limited in stories by the schedule (note 2).

    maximum building height, principal, R-1: 35 feet

    “maximum building height (feet) 35 35 35 35 30”
  • Living in an RVProhibited

    Travel trailers, campers, motor homes and similar vehicles parked on a lot inside Frenchtown borough.

    • Vehicles may be parked or stored on a residential lot only in a side or rear yard area.
    • Exception: emergency trailer housing for households displaced by fire, storm, flooding or other natural disaster during reconstruction (Art. III subsection k, up to one unit per lot, removed before permanent certificate of occupancy).
    • Exception: construction trailers and sales office trailers under subsection l.
    “such vehicles and trailers shall not be used for temporary or permanent living quarters while situated on the lot.”
  • Manufactured homesLimited

    Manufactured home used as a single-family dwelling inside Frenchtown borough.

    • Must be not less than 22 feet wide.
    • Land must be held in fee by the owner of the manufactured home.
    • Must be on a permanent foundation as defined at N.J.S.A. 40:55D-102h.

    minimum width: >= 22 feet

    “provided such manufactured home is not less than 22 feet wide, is located on land to which the title is held in fee by the owner of the manufactured home and is located on a permanent foundation as defined at n.j.s.a. 40:55d-102h.”
  • Mandatory utility hookupSewer (with conditions)

    Owners of houses and buildings located on a street along a borough sewer line inside Frenchtown borough.

    • Connection is required within 90 days after sewer service is made available (§ 16-1.1).
    • Where the sewer is within 200 feet of the property line, connection is required within 120 days after official notice (§ 16-5.4).
    • A borough connection permit is required before any connection (§ 16-6.1).
    • No water-connection mandate was established in this run.

    connection deadline after sewer availability: 90 days (§ 16-1.1 street-frontage rule)

    “shall, within 90 days after the date on which the services of such sewer are made available to such house, building or structure, install a toilet in such structure, unless a toilet is already installed therein, and connect and hook up the sewerage facilities emanating from such house, building or structure to the municipal sewer system.”
    One more reviewed finding on this topic
    • Sewer (with conditions) — Any connection to the borough wastewater sewer inside Frenchtown borough.
      “no unauthorized person shall uncover, make any connections with or opening into, use, alter or disturb any wastewater sewer without first obtaining a written permit from the borough.”
  • Permit feesVariable (with conditions)

    Construction, plumbing, electrical and other subcode permits in Frenchtown borough.

    • Fees are reviewed biannually by the Construction Official and recommended to council based on agency operating expenses.
    • A per-cubic-foot surcharge applies to new construction for state training and certification programs.
    • The published fee amounts in § 12-2.3 were not captured in the opened text.

    training surcharge: 0.0016 USD per cubic foot (new construction)

    “the construction official shall, with the advice of the subcode officials, prepare and submit to the mayor and common council biannually, a report recommending a fee schedule based on the operating expenses of the agency”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Borough of Frenchtown or Hunterdon County directly.

  • Owner-builder exemption — Owner-builder construction in Frenchtown borough.
  • Inspections — Building inspections for construction inside Frenchtown borough.
  • Certificate of occupancy — Certificates of occupancy for new construction inside Frenchtown borough.
  • Minimum dwelling size — Minimum dwelling size for single-family homes in the R-1 zone inside Frenchtown borough.
  • Camping on your land — Temporary camping on land inside Frenchtown borough.
12 more unanswered
  • Tiny homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • 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 Borough of Frenchtown publishes no rule on the point, not that none exists. Hunterdon County’s page lists the county offices to call.

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