Bolthole Index

Monmouth County, New Jersey

Building permits, zoning and septic rules in the Borough of Interlaken, NJ

Inside the Borough of Interlaken, New Jersey (Monmouth County), building permits come from the borough's own Construction Official, and a zoning permit must be secured first1. Interlaken adopts and administers its own zoning, with single-family residential zones only2. Septic and well approvals sit with the local board of health, not the borough building office3.

At a glance

Building permit
Required; Construction Official issues it after zoning permit1
Zoning
Borough zoning: R-A, R-B and R-C single-family residential zones2
Certificate of occupancy
Required before using a new or changed structure4
Septic
Board of health must certify before a building permit issues5
Owner-builder
Registration exemption for own home; permits and affidavit still apply67
Property tax
Monmouth County effective rate 1.8%8

Who to call

Building permits

Borough of Interlaken Building & Code (Construction Department)

Building permit applications, inspections, and code and zoning enforcement questions inside the borough

732-531-7405

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

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Do you need a building permit in Interlaken, NJ?

Yes. Interlaken requires building permits from the Construction Official before any structure is constructed, erected or altered, and only after a zoning permit has first been secured1. The borough's building page adds that some work people think of as maintenance still needs a permit, such as roofing, siding, sheds, decks and pools9. New Jersey's Uniform Construction Code is the statewide base, and ordinary maintenance is the main exception10.

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

The borough has its own Building Department, established as the State Uniform Construction Code enforcing agency11. Applications are available at the Construction Department at Borough Hall, Monday through Friday, 8:30 to 4:30, and most applications require the location of the new structure12. The telephone number is 732-531-74059. Monmouth County does not issue the permit; the county's role is subdivision and site-plan review13.

Does Interlaken have zoning, and what does it mean for RVs, tiny homes and setbacks?

Yes. The borough is divided into R-A, R-B and R-C single-family residential zones2, and the zone map is part of Chapter 26 of the borough code14. New Jersey leaves lot size, setbacks, height and minimum dwelling size to each municipality's zoning by district15. We could not confirm the numeric lot, setback or height standards, or any rule on RVs, tiny homes or accessory dwellings. Ask the borough's zoning and code enforcement official before you buy or plan.

How do septic permits work inside Interlaken?

New Jersey law bars a building permit for a new realty improvement until the board of health having jurisdiction certifies the water supply and sewerage facilities5. The board of health must also inspect a septic system before it is covered16. Which health department serves Interlaken, and whether a given lot is on sewer or septic, we could not confirm. Monmouth County's Office of Public Health handles septic approvals only for its member municipalities17, so ask the borough building office or that county office which board applies.

Can you build your own home in Interlaken?

A person who builds a new home for personal use does not have to register as a builder6. That exemption is about registration and warranty only, not permits or inspections18. The owner must also file a Department of Community Affairs affidavit before a certificate of occupancy can issue7. We could not confirm any Interlaken-specific owner-builder rule.

Building a home in Interlaken: the steps, in order

  1. Confirm the zone and dimensional standards with the borough's zoning official9.
  2. Secure the zoning permit, which must come first1.
  3. Get septic or sewer certification from the board of health having jurisdiction5.
  4. Apply for the building permit from the Construction Official at Borough Hall12.
  5. Schedule inspections; most permits need at least two inspections per inspector involved19.
  6. Obtain a certificate of occupancy before using the structure4.

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

The county does not zone; the county's Development Regulations state that land use and development intensity are controlled by municipal zoning20. Subdivisions and certain site plans touching county roads go to the Monmouth County Development Review Committee, and the county page covers land outside the borough: Monmouth County. Driveways onto a state highway need a state access permit21. Monmouth County's effective property tax rate is 1.8%8.

Watch-outs

  • We could not confirm Interlaken's numeric lot-size, setback, coverage or height standards; ask the borough zoning official14
  • We could not confirm which health department handles septic and well approvals for Interlaken; ask the borough building office or the Monmouth County Office of Public Health22.
  • Permit fees are set by each municipality's ordinance, so ask the Construction Department for the current schedule13.

Sources

  1. § 26-58 Certificates and Permits (Borough of Interlaken), quoted and re-checked
  2. Article II Establishment of Zones (Borough of Interlaken), quoted and re-checked
  3. New Jersey Statutes, R.S. 58:11-23 through 58:11-43 (New Jersey statewide rule), quoted and re-checked
  4. § 26-58 Certificates and Permits (Borough of Interlaken), 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. Builder Registration and New Home Warranty for Builders (New Jersey statewide rule), quoted and re-checked
  7. N.J.A.C. 5:23, Uniform Construction Code (New Jersey statewide rule), quoted and re-checked
  8. Effective property tax rate: Bolthole Index county data
  9. Borough of Interlaken Building & Code (Construction Department) (interlakenboro.com)
  10. N.J.A.C. 5:23-2.14, Construction permits—when required (New Jersey statewide rule), quoted and re-checked
  11. Chapter 10 Building and Housing (Borough of Interlaken), quoted and re-checked
  12. Building & Code (Borough of Interlaken), quoted and re-checked
  13. The New Jersey State Uniform Construction Code — General Information, quoted and re-checked
  14. Article II Establishment of Zones (Borough of Interlaken), quoted and re-checked
  15. P.L. 2013, c.106 (Municipal Land Use Law amendments) (New Jersey statewide rule), quoted and re-checked
  16. New Jersey Statutes, R.S. 58:11-23 through 58:11-43 (New Jersey statewide rule), quoted and re-checked
  17. Office of Public Health Consumer Public Health/Inspection Services, quoted and re-checked
  18. N.J.A.C. 5:25 — Regulations Governing New Home Warranties and Builders' Registration, quoted and re-checked
  19. Building & Code (Borough of Interlaken), quoted and re-checked
  20. Monmouth County Development Regulations Volume I, quoted and re-checked
  21. Major Access Permits (New Jersey statewide rule), quoted and re-checked
  22. Bulletin 79-7: Septic Systems, 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 Borough of Interlaken

Borough of Interlaken’s own rules

  • Building permitRequired

    Construction, erection, or alteration of structures inside Interlaken borough.

    • A zoning permit must first be secured.
    • The required fee accompanies each application.
    • Building permits expire one year after issuance if substantial construction has not commenced.
    “Building permits shall hereafter be secured from the Construction Official prior to the construction, erection or alteration of any structure, but only after a zoning permit has first been secured.”
  • Building code adoptedAdopted

    Construction-code enforcement inside Interlaken borough.

    • The Borough agency enforces the State Uniform Construction Code.
    “There is hereby established in the Borough a State Uniform Construction Code Enforcing Agency to be known as Building Department of the Borough of Interlaken”
  • InspectionsLimited

    Permitted construction inside Interlaken borough.

    • The Borough webpage states that most permits require at least two inspections for each inspector involved.
    • Inspection requirements vary by inspector and permit.
    “It is important to know that most permits require at least two inspections for each inspector involved (i.e., building, plumbing, electric, fire).”
  • Certificate of occupancyRequired

    Any structure or premises created, located, erected, changed, converted, or enlarged inside Interlaken borough.

    • The certificate must be issued by the Construction Official and Building Department.
    • Completed construction must comply with land-use ordinances and applicable Planning Board or Board of Adjustment requirements.
    “It shall be unlawful to use or permit the use of any structure or premises or part thereof hereafter created, located, erected, changed, converted or enlarged wholly or partly until a certificate of occupancy has been issued by the Construction Official and the Building Department of this Borough certifying compliance with all provisions of the State Uniform Construction Code and law.”
  • Local zoningPresent

    Land inside Interlaken borough; the Borough adopts and administers its own zoning ordinance.

    • The code establishes R-A, R-B, and R-C single-family residential zones.
    “For the purpose of this chapter, the Borough of Interlaken is divided into the following zones: R-A Single Family Residential R-B Single Family Residential R-C Single Family Residential”
  • Zoning districtsPublished

    Zoning districts inside Interlaken borough.

    • The code identifies R-A, R-B, and R-C as single-family residential zones.
    • The zoning map is incorporated by reference and is an attachment to Chapter 26.
    “The Zoning Ordinance and the Zone Map of the Borough of Interlaken be and the same are hereby amended and supplemented with respect to the R-A, R-B and R-C Single Family Residential Zone and the Official Zone Map as prepared by the Borough Engineer. (The Zone Map may be found as an attachment to this chapter.)”
  • Permit processPublished (with conditions)

    Building and zoning permit process inside Interlaken borough.

    • Applications are available at the Construction Department at Borough Hall Monday through Friday from 8:30 to 4:30.
    • A location of the new structure is required for most applications.
    • Zoning permit precedes building permit.
    “Permit applications can be obtained at the Construction Department at Borough Hall any Monday through Friday from 8:30 to 4:30. Most applications require a location of the new structure.”

Still unanswered

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

  • Owner-builder exemption — Owner-builder exemption for construction inside Interlaken borough.
  • Minimum dwelling size — Minimum dwelling size in R-A, R-B, and R-C residential zones; the code incorporates a Schedule of Area, Yard and Building Requirements, but the numeric schedule was not retrievable in the opened text.
  • Minimum lot size — Minimum lot size in R-A, R-B, and R-C residential zones.
  • Setbacks — Required front, side, and rear yards in R-A, R-B, and R-C residential zones.
  • Lot coverage — Lot or impervious coverage in R-A, R-B, and R-C residential zones.
10 more unanswered
  • Building height
  • Camping on your land
  • Tiny homes
  • Accessory dwellings
  • Septic permit
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Driveway access
  • 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 Interlaken publishes no rule on the point, not that none exists. Monmouth County’s page lists the county offices to call.

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