Zoning, building permits and septic rules in South River, New Jersey

At a glance

Building permit

Required; issued by the borough Building Department under the state Uniform Construction Code²⁵

Zoning

Borough zoning ordinance, Chapter 350, with districts such as R-100 and R-75 single-family residential¹⁶

Septic

Permit from the borough Board of Health; $200 application fee plus $200 permit fee⁷

Owner-builder

Owner may file own permits, but the permit is still required⁸

Certificate of occupancy

Required before a new building is used or occupied⁹

Minimum lot size and setbacks

Set district by district in the borough zoning ordinance¹⁰

Who to call

Contact details are copied from each office’s official page and were checked against it on October 14, 2026.

Does South River, NJ have zoning, and what does it mean for lots and setbacks?

Yes. The Borough of South River adopts and administers its own zoning ordinance, Chapter 350 of the borough code¹. Its districts include R-100 and R-75 single-family residential, B-1 neighborhood business, and a Lincoln School Neighborhood overlay⁶.

Lot size, setbacks, height and lot coverage are set district by district in the ordinance¹⁰¹¹. We could not confirm the dimensional figures for the residential districts, so ask the borough zoning officer before you rely on any lot. We also could not confirm rules for RVs, tiny homes or accessory dwellings inside the borough; ask the same office.

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

Yes. New Jersey's Uniform Construction Code requires a construction permit for new construction and for structural, plumbing, mechanical and electrical work on existing buildings; ordinary maintenance is excepted¹². South River adopted that code as the borough's building code, and the borough Building Department at 48 Washington Street is the enforcing agency².

The county does not issue building permits for private homes; the municipal construction official does¹³. A state or local approval, including zoning, has to be in place before a permit issues¹⁴. The Building Department's number is 732-257-1999¹⁵.

How do septic permits work inside South River?

The borough Board of Health requires a permit before anyone locates, constructs or alters an individual sewage disposal system⁷. The filing fee is $200 and the permit issuance fee is $200⁷. A new system needs a certificate of compliance before it is used or occupied¹⁶.

The county's Environmental Health Division also states that all septic work requires its approval; its number is 732-745-8480¹⁷. Call the borough Board of Health first to learn how the two offices split the work. The USDA rates 0% of soils in Middlesex County as not limited for a conventional drain field, so expect a site evaluation and often an engineered design¹⁸.

Building a home in South River: the steps, in order

1. Confirm the lot's zoning district and dimensional rules with the borough zoning officer⁶.
2. If the lot is not on sewer, get septic approval; the board of health must certify sewerage facilities before a building permit issues¹⁹.
3. Apply for the construction permit at the Building Department; the state allows 20 business days for a decision²⁰.
4. Request inspections at each stage, with 24 hours' notice²¹.
5. Obtain the certificate of occupancy before moving in⁹.

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

Middlesex County's planning board reviews subdivisions and site plans that affect county roads or drainage, but that review does not replace borough approvals²². Subdivision inside the borough is regulated under Chapter 295²³. For land outside the borough, see the Middlesex County page.

A driveway onto a state highway needs a state access permit²⁴. Middlesex County's effective property tax rate is 2.2%²⁵.

Watch-outs

• We could not confirm who signs septic permits in practice: the borough code names the Board of Health³, while the county health division says all septic work needs its approval¹⁷. Call both before you buy.
• Owner-builders still need a construction permit, and must file an affidavit before a certificate of occupancy issues²⁶.
• We could not confirm borough rules on flood hazard areas, water or sewer connection, wells or RV occupancy; ask the borough Building Department at 732-257-1999¹⁵.

Sources

1. Borough of South River Code, Chapter 350 Zoning (eCode360) (Borough of South River), quoted and re-checked
2. Borough of South River Code, Chapter 129 Construction Codes, Uniform (eCode360) (Borough of South River), quoted and re-checked
3. Borough of South River Code, Chapter 379 Sewage Disposal Systems, Individual (Board of Health) (eCode360) (Borough of South River), quoted and re-checked
4. P.L. 2013, c.106 — Municipal Land Use Law amendments (New Jersey statewide rule), quoted and re-checked
5. N.J.A.C. 5:23-2.14, Construction permits—when required (New Jersey statewide rule), quoted and re-checked
6. Borough of South River Code, Chapter 350 Zoning (eCode360) (Borough of South River), quoted and re-checked
7. Borough of South River Code, Chapter 379 Sewage Disposal Systems, Individual (Board of Health) (eCode360) (Borough of South River), quoted and re-checked
8. NJ Dept of Community Affairs — UCC General Information (2026 county census)
9. N.J.A.C. 5:23, Uniform Construction Code (New Jersey statewide rule), quoted and re-checked
10. P.L. 2013, c.106 (Municipal Land Use Law amendments) (New Jersey statewide rule), quoted and re-checked
11. P.L. 2013, c.106 (Municipal Land Use Law amendments) (New Jersey statewide rule), quoted and re-checked
12. The New Jersey State Uniform Construction Code, quoted and re-checked
13. P.L. 2018, c.157 — County Code Enforcement Pilot Program (New Jersey statewide rule), quoted and re-checked
14. New Jersey Uniform Construction Code, N.J.A.C. 5:23 (New Jersey statewide rule), quoted and re-checked
15. South River Borough Building Department (southrivernj.org)
16. Borough of South River Code, Chapter 379 Sewage Disposal Systems, Individual (Board of Health) (eCode360) (Borough of South River), quoted and re-checked
17. Middlesex County Environmental Health Division (middlesexcountynj.gov)
18. 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
19. New Jersey Statutes, R.S. 58:11-23 through 58:11-43 (New Jersey statewide rule), quoted and re-checked
20. N.J.A.C. 5:23 Uniform Construction Code, quoted and re-checked
21. N.J.A.C. 5:23 Uniform Construction Code, quoted and re-checked
22. Middlesex County Planning Board Resolution 2025-13 and Land Development Standards Chapter 400, quoted and re-checked
23. Borough of South River Code, Chapter 350 Zoning (eCode360) (Borough of South River), quoted and re-checked
24. Major Access Permits (New Jersey statewide rule), quoted and re-checked
25. Effective property tax rate: Bolthole Index county data
26. N.J.A.C. 5:23, Uniform Construction Code (New Jersey statewide rule), quoted and re-checked

Written October 14, 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.