Bolthole Index

Morris County, New Jersey

Building permits, zoning and septic rules in Mendham Township, New Jersey

Mendham Township, Morris County, New Jersey has its own zoning ordinance and zoning map1. Building permits are required under the state Uniform Construction Code and come from the Township Construction Department23. Septic permits are handled through the Township Board of Health under Chapter 383, with the Morris County Division of Public Health serving the township4.

At a glance

Building permit
Required; issued by the Township Construction Department23
Zoning
Township zoning ordinance and zoning map apply to all land1
Septic
Permit required; Township Board of Health and Morris County Division of Public Health54
RV living
Prohibited for dwelling or sleeping, except temporary use after a disaster6
Minimum house size
800 square feet in the R, R-1, R-2, R-3, R-5 and R-10 districts7
Wells and sewer
Most areas use private wells and septic8

Who to call

Building permits

Mendham Township Construction Department

Building, plumbing, electrical and fire subcode permits and inspections under the Uniform Construction Code; the same office lists a construction / zoning official

973-543-4555

2 West Main Street, Brookside, NJ 07926

Zoning

Mendham Township Planning & Zoning

Planning board and zoning land-use applications for the Township

973-543-4555

2 West Main Street, Brookside, NJ 07926

Septic permits

Morris County Division of Public Health

Local health department listed for Mendham Township, working with the Township Board of Health on septic

973-631-5484

PO Box 900, Morristown, NJ 07963

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

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Does Mendham Township, NJ have zoning, and what does it mean for RVs, tiny homes and house size?

Mendham Township has its own zoning. The Township's official zoning map and its Chapter 500 zoning regulations control land use inside the township1. Morris County does not zone unincorporated land in New Jersey, so the Township ordinance is the one to read9.

Living in an RV is not allowed. The ordinance bars using a trailer, camper, recreation vehicle or mobile home for dwelling or sleeping, with one narrow exception: a house-trailer may be used temporarily when a residence has been made uninhabitable by fire or another disaster, with a Township permit and a Township Committee resolution6.

In the R, R-1, R-2, R-3, R-5 and R-10 one-family districts, a single detached house must have at least 800 square feet of floor area7. We could not confirm a rule that specifically addresses tiny homes; ask Planning & Zoning at 973-543-455510.

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

Yes. New Jersey's Uniform Construction Code requires a permit for construction, enlargement, alteration, repair and demolition, and the Township Construction Department administers and enforces that code in Mendham Township23. The county does not issue building permits.

A certificate of occupancy is required for new buildings, and a final inspection comes first1112. An owner building a home to live in may sign as the exempt applicant on the permit application, but the code and licensing rules still apply13. Whether Mendham Township adds any further owner-builder rule is unconfirmed; ask the Construction Department3.

How do septic permits work in Mendham Township?

A permit is required to construct, alter or modify an individual subsurface sewage disposal system in Mendham Township5. The Township Board of Health administers the Township ordinance and state standards, and the Morris County Division of Public Health is the health department listed as serving Mendham Township414.

Installation is inspected by the Township Sanitarian, and a licensed engineer must certify compliance before the certificate of compliance is issued15. The building side depends on it: the construction official needs approval of the septic plan, including the bedroom count, before issuing a construction permit16.

Morris County's soils make this a real step. Only 12.4% of county soils are rated not limited for a conventional drain field, so expect a site evaluation and possibly an engineered system17.

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

Not in an RV. Mendham Township's zoning bars dwelling or sleeping in a trailer, camper, recreation vehicle or mobile home, apart from temporary use after a disaster6. Overnight camping is allowed only in the common open space of the CR-1 Combination Residential District, under regulations approved by the Planning Board18.

For tiny homes, we could not confirm any provision. State law lets a municipality adopt a rental ordinance for tiny homes on municipally owned vacant land, but it does not make tiny homes allowed on private lots19. Ask Planning & Zoning before buying10.

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

  1. Read the zoning map and Chapter 500 for your lot's district, and confirm lot size and setbacks with Planning & Zoning110.
  2. Get septic plan approval from the Board of Health and Morris County Division of Public Health414.
  3. Apply to the Construction Department for a building permit, with approvals the construction official requires first23.
  4. Pass the staged inspections20.
  5. Have the septic system certified, then obtain the certificate of occupancy16.

What to check before you buy land in Mendham Township

Utilities: most of the township uses private onsite wells and septic, and public sewers reach only Brookrace, Drakewick and Mountainview8. A new well needs a state permit21.

Roads: a driveway onto a county road needs a Morris County right-of-way permit applied for 10 days before construction, and one onto a state highway needs state access approval2223.

Costs: Morris County's effective property tax rate is 1.8%, with a median bill of $10,001 a year2425. For land outside the township, see the Morris County page.

Watch-outs

  • Lot size, setback, coverage and height figures for each district were not confirmed; get the district schedule from Planning & Zoning before you rely on a design10.
  • Manufactured-home rules inside the township were not confirmed, so ask Planning & Zoning before placing one10.
  • Short-term rental rules for the township were not confirmed; ask the Township office at 973-543-45553.

Sources

  1. Chapter 500: Zoning - Township of Mendham, NJ (Mendham Township), quoted and re-checked
  2. N.J.A.C. 5:23-2.14, Construction permits—when required (New Jersey statewide rule), quoted and re-checked
  3. Mendham Township Construction Department (mendhamtownship.org)
  4. Chapter 383: Sewage Disposal Systems, Individual Subsurface - Township of Mendham, NJ (Mendham Township), quoted and re-checked
  5. Chapter 383: Sewage Disposal Systems, Individual Subsurface - Township of Mendham, NJ (Mendham Township), quoted and re-checked
  6. Chapter 500: Zoning - Township of Mendham, NJ (Mendham Township), quoted and re-checked
  7. ecode360.com (Mendham Township), quoted and re-checked
  8. Section 9.21 – Township of Mendham (Mendham Township), quoted and re-checked
  9. P.L. 2013, c.106 — Municipal Land Use Law amendments (New Jersey statewide rule), quoted and re-checked
  10. Mendham Township Planning & Zoning (mendhamtownship.org)
  11. N.J.A.C. 5:23, Uniform Construction Code (New Jersey statewide rule), quoted and re-checked
  12. Construction Code FAQs for New Home Buyers, quoted and re-checked
  13. nj.gov, quoted and re-checked
  14. Morris County Division of Public Health (morriscountynj.gov)
  15. Chapter 383: Sewage Disposal Systems, Individual Subsurface - Township of Mendham, NJ (Mendham Township), quoted and re-checked
  16. DCA Bulletin 79-7: Septic Systems, quoted and re-checked
  17. 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
  18. ecode360.com (Mendham Township), quoted and re-checked
  19. P.L. 2019, Chapter 490 — Tiny Home Occupancy, quoted and re-checked
  20. New Jersey Department of Community Affairs, New Home Warranty—Consumer Information (New Jersey statewide rule), quoted and re-checked
  21. Bulletin 88-10: Private On-Site Water Supply Systems (New Jersey statewide rule), quoted and re-checked
  22. Morris County Land Development Standards, quoted and re-checked
  23. Major Access Permits (New Jersey statewide rule), quoted and re-checked
  24. Effective property tax rate: Bolthole Index county data
  25. Median property tax bill: 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 Mendham Township

Mendham Township’s own rules

  • Local zoningPresent

    All land-use regulation inside Mendham Township.

    • The Township's official zoning map and Chapter 500 zoning regulations apply within the Township.
    “There is hereby adopted as the official Zoning Map of the Township of Mendham that certain map prepared by Ferriero Engineering dated May 2012 and captioned "Zoning Map, Township of Mendham, Morris County, NJ." Said Zoning Map shall control all land uses in the Township of Mendham and all prior zoning maps are hereby repealed to the extent inconsistent herewith.”
  • Living in an RVProhibited

    Use of a trailer, house-trailer, camper, recreation vehicle, mobile home, boat, or similar facility for dwelling or sleeping purposes inside Mendham Township.

    • A house-trailer may be used temporarily only when the residence has been rendered uninhabitable by fire or another natural or man-made disaster.
    • The temporary use requires a permit from the Township Construction Code and Fire Code Officials, compliance with zoning setbacks, and a Township Committee resolution approving the use and conditions.
    “trailer, house-trailer, camper, recreation vehicle”
  • Who permits septicMixed

    Individual subsurface sewage disposal systems inside Mendham Township.

    • The Township Board of Health administers the Township ordinance and state standards.
    • Morris County's official health-department page identifies the Morris County Division of Public Health as serving Mendham Township.
    “Morris County Division of Public Health [...] Mendham Township”
  • Septic permitRequired

    Construction, alteration, modification, and specified repair of individual subsurface sewage disposal systems inside Mendham Township.

    • Repair applications may be reviewed by the Registered Environmental Health Specialist when the repair restores the system without changing location, design, construction, size, capacity, type, or number of components.
    • Certain alterations may be handled administratively only when there is no intensification, variance, waiver, exception, or setback relief.
    “An application for a permit to construct”
  • Septic inspectionRequired

    New, altered, and repaired individual subsurface sewage disposal systems inside Mendham Township.

    • The Township Sanitarian First Grade and licensed professional engineer must certify installation compliance before the certificate of compliance is issued.
    • Inspection fees are payable before issuance of the construction permit.
    “the Township of Sanitarian First Grade who inspected the system”
  • Off-grid sanitationLimited

    Off-public-sewer sanitation through an individual subsurface sewage disposal system inside Mendham Township.

    • A Board of Health permit and approved plans are required.
    • The Township ordinance incorporates state standards and may impose higher Township standards.
    • Graywater disposal is not required but may be approved by the Board of Health.
    “A graywater disposal system is not required”
  • Mandatory utility hookupConditional

    Public utility availability inside Mendham Township generally varies by location.

    • Official county hazard-plan material states that most areas use private onsite wells and septic; limited areas have public water lines; only three areas have public sanitary sewers: Brookrace, Drakewick, and Mountainview.
    • The reviewed materials did not state a mandatory distance-based connection rule.
    “Most areas of the Township are served by individual private onsite wells. There are limited areas served by public water lines.”

Rules another office applies inside Mendham Township

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

  • Minimum dwelling sizeSpecified

    Single detached houses in the R, R-1, R-2, R-3, R-5, and R-10 One Family Residence Districts.

    • The ordinance states the minimum floor area for the permitted single detached house use.

    minimum floor area: >= 800 square feet

    “minimum floor area of not less than 800 square feet”
  • Camping on your landLimited

    Overnight camping in the common open space of the CR-1 Combination Residential District.

    • The common open space must be set aside in perpetuity for land conservation purposes.
    • Overnight camping is permitted only pursuant to regulations approved by the Planning Board.
    • Uses inconsistent with those limitations are prohibited.
    “Picnicking and overnight camping shall be permitted”

Still unanswered

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

  • Owner-builder exemption — Owner-built construction inside Mendham Township.
  • Minimum lot size — Main single-family residential districts, including R, R-1, R-2, R-3, R-5, and R-10, and rural/agricultural residential areas.
  • Setbacks — Main single-family residential districts and rural/agricultural residential areas inside Mendham Township.
  • Lot coverage — Main single-family residential districts and rural/agricultural residential areas inside Mendham Township.
  • Building height — Main single-family residential districts and rural/agricultural residential areas inside Mendham Township.
3 more unanswered
  • Tiny homes
  • Manufactured homes
  • 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 Mendham Township publishes no rule on the point, not that none exists. Morris County’s page lists the county offices to call.

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