Bolthole Index

Union County, New Jersey

Zoning, building permits and septic rules in Kenilworth, New Jersey

A construction permit is required for new construction in the Borough of Kenilworth, Union County, New Jersey, and the borough's own Building Department issues it12. Kenilworth adopts and administers its own zoning; Union County does not zone34. Septic permits come from a board of health, and we could not confirm which one serves Kenilworth5.

At a glance

Building permit
Required; issued by the Kenilworth Building Department12
Permit turnaround
20 business days to prepare a permit once the application is complete2
Zoning
Borough zoning under Chapter 120, Land Use; 16 land-use districts36
Minimum lot (R-5 / R-6)
5,000 sq ft in R-5; 6,000 sq ft in R-678
Maximum height (R-5 / R-6)
35 feet and 2 1/2 habitable floors for principal buildings910
Septic
Board of health sign-off required before a building permit; which board serves Kenilworth is unconfirmed5
Owner-builder
Allowed with an affidavit; still needs permits and inspections11

Who to call

Building permits

Kenilworth Building Department (Construction / Zoning Office)

Construction permits, plan review, inspections and zoning administration inside the borough

908-276-5802

zoningofficer@kenilworthnj.org

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 Borough of Kenilworth means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Kenilworth, NJ?

Yes. New Jersey's statewide Uniform Construction Code requires a construction permit for new construction and for structural, plumbing, mechanical and electrical work on existing buildings12. Ordinary maintenance, including routine repair, is the main exception12.

In Kenilworth the Building Department has 20 business days to prepare a permit once an application is complete and includes any prior approvals213. Subcode officials review plans and the Construction Official gives the final sign-off2. Expect inspections at footing, rough plumbing and electrical, and framing stages, and a certificate of occupancy before you move in1415.

Who issues building permits in Kenilworth, and how do you reach them?

The Borough of Kenilworth's own Building Department handles construction permits, and the same office lists the zoning officer213. Call 908-276-5802 or email zoningofficer@kenilworthnj.org13.

Union County does not issue building permits for private construction in the borough; applications go to the local enforcing agency1617. The borough's own fee schedule applies, since New Jersey municipalities adopt their own permit fees by ordinance18. Ask the Building Department for the current amount.

Does Kenilworth have zoning, and what does it mean for lot size and height?

Yes. Kenilworth adopted its land-use chapter, Chapter 120, by Ordinance 2015-053. The borough is divided into 16 classes of land-use districts, including overlay zones6. Union County does not adopt zoning for municipalities419.

Dimensions depend on the district. In R-5, every single-family lot needs at least 5,000 square feet and 50 feet of width and frontage7. In R-6, the minimum is 6,000 square feet with 60 feet of width and frontage8. Principal buildings in both districts are capped at 2 1/2 habitable floors and 35 feet910.

We could not confirm a minimum dwelling size, accessory-dwelling rules, or subdivision requirements; ask the zoning officer13.

How do septic permits work in Kenilworth?

Septic and well approvals do not come from the Building Department. New Jersey law bars any municipality from issuing a building permit for a new realty improvement until the board of health having jurisdiction certifies the water supply and sewerage facilities5. A septic system must also be inspected by the board of health before it is covered20.

We could not confirm which health authority handles septic systems inside Kenilworth, or whether a new home must connect to public sewer. Union County's general information line can route you to the right municipal or health office21. Private wells need a state drilling permit plus a local health-official well permit22.

Can you live in an RV or tiny home in Kenilworth?

We could not confirm a Kenilworth rule on living in an RV, temporary camping, or occupying a tiny home on a lot. Ask the zoning officer before buying or placing one.

New Jersey's statewide construction code adopts a Tiny Houses appendix for detached one- and two-family dwellings, but construction must still meet local land-use, utility and septic approvals23. HUD manufactured homes are limited to use group R-5, single-family dwellings24.

Building a home in Kenilworth: the steps, in order

  1. Confirm the lot's zoning district and dimensional limits with the zoning officer613.
  2. Get any subdivision, planning board or other prior approvals; no permit issues until required State, county and local approvals are in place25.
  3. Get board of health certification of water and sewerage facilities5.
  4. Apply to the Kenilworth Building Department; a complete application is acted on within 20 business days216.
  5. Pass the footing, rough-in and framing inspections14.
  6. Obtain the certificate of occupancy15.

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

Union County's planning board reviews subdivisions and site plans only as they affect county roads and drainage facilities26. Municipal approval remains part of that process27. A driveway onto a State highway needs a state access permit28. See the Union County page for the county's own answers.

Owners who build their own home must file a Department of Community Affairs affidavit and disclose the lack of new-home warranty coverage to a buyer within 10 years of the certificate of occupancy29. This is not a permit exemption11. Union County's effective property tax rate is 2%30, and its typical home value is $641,17431.

Watch-outs

  • Septic authority, sewer-connection duties and private-well approvals inside Kenilworth are unconfirmed; ask the Building Department who serves as the board of health before you design a site5.
  • Flood-hazard rules exist in the borough's Flood Damage Prevention chapter, but we could not confirm the permit steps; ask the Construction Official before building in a mapped flood area13.
  • Union County government's general line is not a permit office, and the county has no zoning or building-permit authority over private construction417.

Sources

  1. NJ Dept of Community Affairs — The NJ State Uniform Construction Code (2026 county census)
  2. Construction / Building Department (Borough of Kenilworth), quoted and re-checked
  3. Chapter 120: Land Use (Borough of Kenilworth), quoted and re-checked
  4. P.L. 2013, c.106 — Municipal Land Use Law amendments (New Jersey statewide rule), quoted and re-checked
  5. New Jersey Statutes, R.S. 58:11-23 through 58:11-43 (New Jersey statewide rule), quoted and re-checked
  6. Establishment of Zoning Districts (Borough of Kenilworth), quoted and re-checked
  7. ecode360.com (Borough of Kenilworth), quoted and re-checked
  8. ecode360.com (Borough of Kenilworth), quoted and re-checked
  9. ecode360.com (Borough of Kenilworth), quoted and re-checked
  10. ecode360.com (Borough of Kenilworth), quoted and re-checked
  11. N.J.A.C. 5:23-2.15 Construction permits--application, quoted and re-checked
  12. The New Jersey State Uniform Construction Code: General Information, quoted and re-checked
  13. Kenilworth Building Department (Construction / Zoning Office) (kenilworthborough.com)
  14. Construction Code FAQs for New Home Buyers, quoted and re-checked
  15. Construction Code FAQs for New Home Buyers, quoted and re-checked
  16. The New Jersey State Uniform Construction Code: General Information, quoted and re-checked
  17. P.L. 2018, c.157 — County Code Enforcement Pilot Program (New Jersey statewide rule), quoted and re-checked
  18. New Jersey Uniform Construction Code General Information, quoted and re-checked
  19. Union County Planning Board, 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. NJDEP Septic Systems, quoted and re-checked
  22. Bulletin 88-10: Private On-Site Water Supply Systems (New Jersey statewide rule), quoted and re-checked
  23. N.J.A.C. 5:23 Uniform Construction Code, quoted and re-checked
  24. Manufactured/Modular Buildings Program (New Jersey statewide rule), quoted and re-checked
  25. New Jersey Uniform Construction Code, N.J.A.C. 5:23 (New Jersey statewide rule), quoted and re-checked
  26. Union County Planning Board, quoted and re-checked
  27. Union County Planning Board, quoted and re-checked
  28. Major Access Permits (New Jersey statewide rule), quoted and re-checked
  29. N.J.A.C. 5:23, Uniform Construction Code (New Jersey statewide rule), quoted and re-checked
  30. Effective property tax rate: Bolthole Index county data
  31. Typical home value (Zillow): Bolthole Index county data

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 Borough of Kenilworth

Borough of Kenilworth’s own rules

  • Local zoningPresent

    Land inside Kenilworth borough.

    • Chapter 120 was adopted by the Mayor and Council on 2015-09-23 by Ordinance 2015-05.
    “HISTORY: Adopted by the Mayor and Council of the Borough of Kenilworth 9-23-2015 by Ord. No. 2015-05.”
  • Zoning districtsPublished

    Land inside Kenilworth borough.

    • The zoning map is incorporated into the land-use chapter and kept by the Zoning Officer and Borough Engineer.
    “the Borough is hereby divided into 16 classes of land use districts, including overlay zones”
  • Minimum lot sizeSpecified

    Single-family residential development in R-5.

    • Minimum lot width and frontage are 50 feet.

    minimum lot area: >= 5000 square feet

    “Minimum lot size. Every lot shall contain a minimum lot area of 5,000 square feet.”
    One more reviewed finding on this topic
    • Specified — Single-family residential development in R-6.
      “Minimum lot size. Every lot shall contain a minimum lot area of 6,000 square feet.”
  • Building heightSpecified

    Principal buildings in R-5.

    • A proposed addition may match the existing nonconforming height of the principal dwelling.

    maximum height: <= 35 feet (maximum 2.5 habitable floors exclusive of basement)

    “No principal building shall exceed the maximum of 2 1/2 habitable floors, exclusive of basement, and 35 feet. The height of a proposed addition may match the existing nonconforming height of the principal dwelling.”
    One more reviewed finding on this topic
    • Specified — Principal buildings in R-6.
      “No principal building shall exceed the maximum of 2 1/2 habitable floors, exclusive of basement, and 35 feet. The height of a proposed addition may match the existing nonconforming height of the principal dwelling.”
  • Permit processPublished (with conditions)

    Construction-permit applications submitted to the Kenilworth Building Department.

    • Completed applications include prior approvals.
    • Subcode officials review plans and the Construction Official gives final sign-off.
    • The responsible party is notified of the calculated permit cost.

    processing period: <= 20 business days (completed application including prior approvals)

    “the Building Department has 20 business days to prepare your permit.”

Rules another office applies inside Borough of Kenilworth

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

  • Owner-builder exemptionAvailable (with conditions)

    A person constructing a new home inside Kenilworth borough for personal use.

    • This is a builder-registration and warranty exception, not an exemption from permits, inspections, or construction codes.
    “The only exception is a person who constructs a new home for his or her own personal use.”

Still unanswered

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

  • Minimum dwelling size — Residential districts inside Kenilworth borough.
  • Living in an RV — RV occupancy on private land inside Kenilworth borough.
  • Camping on your land — Temporary camping inside Kenilworth borough.
  • Tiny homes — Tiny-home occupancy inside Kenilworth borough.
  • Manufactured homes — Manufactured-home occupancy inside Kenilworth borough.
11 more unanswered
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • 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 Borough of Kenilworth publishes no rule on the point, not that none exists. Union County’s page lists the county offices to call.

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