Warren Zoning and Development
Warren Township is zoned overwhelmingly for large lot single family housing. The dominant residential district is R-65, which the code calls 1 1/2 Acre Residential and which delivers exactly that: across 464 sales in the past five years, the median R-65 lot was 1.51 acres. Around that sit a half acre district, a small lot district, environmentally constrained rural districts at three acres and six acres, a short list of business and office districts, and a set of affordable housing districts that grew again in 2026 with four more. Data centers are prohibited in every district. Land use applications are heard by one of two boards depending on whether the project conforms to the zoning. Updated August 21, 2026.
The zoning districts
Warren's districts are established at § 16-2.1 of Chapter 16. These are the district symbols and their official names as codified.
Residential
| District | Official name |
|---|---|
| R-10 | Residential District |
| R-20 | 1/2 Acre Residential |
| R-20(V) | 1/2 Acre Residential |
| R-20(V)/PAC | 1/2 Acre Residential/Planned Adult Community |
| R-40 | Rural Residential District |
| R-65 | 1 1/2 Acre Residential |
| R-65/PAC | 1 1/2 Acre Residential/Planned Adult Community |
| R-65/SC | 1 1/2 Acre Residential/Senior Citizen/Community Business |
| ECR | Environmental Critical Rural Residential District |
| CR-130/65 | 3-1 1/2 Acre Environmental Critical Rural Residential District |
| EP-250 | 6 Acre Residential Environmental Protection |
Business
| District | Official name |
|---|---|
| CB | Community Business |
| NB | Neighborhood Business |
| HNB | Historic Neighborhood Business District |
| BR-40 | Business Residential (1 Acre) |
| BR-80 | Business Residential (2 Acre) |
| RBLR | Residential Business Limited Retail |
Office, industrial and redevelopment
| District | Official name |
|---|---|
| OR | Office Research |
| ORH | Office Research Hotel |
| G-I | General Industrial |
| MRRP | 15 Mountainview Road Redevelopment Plan District |
Affordable housing
The codified chapter carries a set of fair share districts designated R-R (AH), R-10 (AH), R-10 (AH/MF), R-40 (AH/MF) and R-MF, a series of numbered AH districts running up to AH-8, and a UR-F Urban Renewal affordable housing overlay. Four more, AH-9 through AH-12, were created by ordinance in 2026 and are covered further down this page. The numbered series has gaps and amendments in it, so read the district list at § 16-2.1 directly rather than assuming every number between 1 and 8 is a live district.
The numeral in a residential district name tracks the minimum lot size. The code states several of them outright in the district names themselves: R-20 is the half acre district, R-65 is the acre and a half district, BR-40 is one acre, BR-80 is two acres and EP-250 is six acres. Read the number as roughly the minimum lot area in thousands of square feet, so R-65 is about 65,000 square feet, which is an acre and a half. The convention is approximate and always rounds in the same direction: 65,000 square feet is 1.49 acres against the 1.5 the name claims, and 20,000 is 0.46 acres against a stated half acre. Treat the numeral as a label, not a measurement. The authoritative dimensional requirements, including lot width, yard setbacks and building height, live in the township's Schedule of Area, Yard and Building Requirements at § 16-8, which is published as a separate attachment to the code. Confirm any specific number there or with the Zoning Officer before relying on it.
What each zone actually delivers
District minimums tell you what is permitted. They do not tell you what is there. This table is the second thing, built from five years of Warren closed sales matched to the county parcel record. It is original to this publication.
| Zone | What it is | Sales | Median acres | Median price |
|---|---|---|---|---|
| R-65 | 1 1/2 Acre Residential | 464 | 1.51 | $1,060,000 |
| R-20(V) | 1/2 Acre Residential | 91 | 0.52 | $660,000 |
| R-10 | Residential District | 50 | 0.23 | $830,000 |
| PAC | Planned Adult Community | 44 | 0.18 | $1,185,000 |
| R-R (AH) | Affordable housing district | 41 | 0.73 | $1,525,000 |
| CR-130/65 | Environmental Critical Rural | 30 | 1.55 | $1,445,000 |
| R-40 variant | Rural Residential | 25 | 0.75 | $1,290,000 |
| ORH | Office Research Hotel | 22 | 0.04 | $849,650 |
Three things worth reading off that table. The big residential districts deliver what their names promise, with R-65 at a median 1.51 acres and R-20(V) at 0.52. The most expensive zone by median price is not a large lot district at all: R-R (AH), an affordable housing district, records a $1,525,000 median on 0.73 acre lots. Age is most of the reason. The median R-R (AH) home that sold was built in 2000 against 1978 for R-65, a twenty two year gap, because inclusionary districts carry market rate housing alongside the affordable units and that market rate product is comparatively new construction. And the 0.04 acre median in ORH reflects attached homes, where the parcel recorded against a unit is not the ground the household uses.
Lots created before the current standards took effect remain legal at their existing size. They are pre-existing nonconforming, which is why the R-40 variant records a 0.75 acre median against a district numeral implying nearer nine tenths of an acre. A small lot in a big lot zone is common in Warren and is not by itself a problem. What it does affect is whether that lot can be subdivided or expanded, which is a question for the Zoning Officer, not for a table.
Zoning designations above are as carried in the parcel and listing record and are sometimes abbreviated more tersely than the code writes them. Districts with fewer than 20 recorded sales in the five year window are omitted.
What changed in 2026
Two pieces of 2026 ordinance activity changed what can be built in Warren. One got most of the coverage. The other was larger.
| Ordinance | What it does | Status |
|---|---|---|
| 26-06 through 26-11, 26-14 | Seven ordinances creating affordable housing districts AH-9, AH-10, AH-11 and AH-12, establishing an affordable housing development fee, replacing hotel area with age restricted inclusionary housing, and adding two units to the existing AH-6 district | Adopted 2026 |
| 26-19 | Prohibits data centers in every zoning district. Defines the term, adds it to prohibited uses at 16-5.25, removes it from permitted uses in the G-I General Industrial district, and adds performance standards at 16-23.14 | Adopted June 18, 2026 |
The seven ordinance affordable housing package is the more consequential of the two in what it permits to be built, and it moved through seven separate ordinances while the data center prohibition, which passed with no application pending, moved through one. Full coverage: the four new districts and the development fee, and the data center prohibition.
The Fourth Round obligation
The single largest force shaping Warren land use is the Fourth Round affordable housing obligation. A mediation agreement signed in December set the number at 262 units and satisfies it with 197 units plus 65 bonus credits spread across six components. The zoning that makes it real is the AH-9 through AH-12 package. The financing deadline is March 15, 2027. Background: the mediation agreement.
What is being built
Everything below has an adopted ordinance, a filed agreement, a signed contract or a ballot line behind it. Nothing here is a rumor.
| Project | Status | Next date that matters |
|---|---|---|
| Fourth Round affordable housing, six components | Mediation agreement filed, ordinances adopted | Financing deadline March 15, 2027 |
| Affordable housing districts AH-9 through AH-12 | Adopted 2026 | Site specific applications as filed |
| Bardy property, 149 Washington Valley Road | In the fair share plan, contested by residents | Application not yet heard |
| Federal Reserve campus amendment | Amended site plan approved 9 to 0 | Construction on the applicant's schedule |
| Dealaman Trails and Pond, 173 and 197 Mount Horeb Road | Appropriation ordinance, $1,140,160 with a $570,080 Green Acres matching award | Final hearing held August 20, 2026 |
| Town Hall restoration, third floor | Contract awarded, not to exceed $1,444,389 | Completion, no public date |
| 2026 road program, 24 streets | Contract awarded at $945,800, work underway | Paving season through fall |
| Hofheimer House restoration | $7,500,000 question on the general election ballot | Vote November 3, 2026 |
This table is a snapshot. The maintained version, updated as the pipeline moves, is the Warren development pipeline.
Which board hears your application
Residents mix these up constantly, and the difference decides both the standard of proof and who sits on the panel.
Planning Board. Subdivisions, site plans, conditional uses and the master plan. It is where a conforming project goes.
Zoning Board of Adjustment. Variances, including use variances for things the zoning does not permit at all. It is where a nonconforming project goes.
For 2026 the Planning Board is chaired by John Lindner with Matt Lippitt as Vice-Chairman, and the Zoning Board of Adjustment by Foster Cooper with Michael Galbraith as Vice Chairman. Planning Board seats are filled by class: Mayor Shaun Fine holds the Class I seat, Sal DiBianca Class II and Committeewoman Vanessa Kian Class III. Committeeman Daniel McCarey is the 2026 Township Committee liaison to the Zoning Board. Both boards reorganized on January 12, 2026, covered in the reorganization report. Meeting dates for both boards are on the Warren calendar as they are confirmed.
How to look up your own lot
Four steps, in the order that actually works:
1. Find your block and lot. It is on your tax bill and on the assessment record. Everything else keys off it.
2. Find your district. The Township publishes a zoning districts map. Your block and lot tells you which district polygon you sit in.
3. Read the dimensional requirements. The Schedule of Area, Yard and Building Requirements at § 16-8 gives minimum lot area, width, setbacks and height for your district. Chapter 16 gives permitted and prohibited uses.
4. Check what is already permitted on the property. Open permits and prior approvals change what you can do next, and they are a matter of public record through the Township construction office.
If any of that produces an answer you plan to act on, confirm it with the Zoning Officer in writing. A zoning determination is cheap. A variance application after the fact is not.
- Township of Warren code, Chapter 16 Zoning, § 16-2.1 districts established, and Chapter 15 Land Use Procedures and Development, as published by the township's codifier. ecode360.com
- Schedule of Area, Yard and Building Requirements, § 16-8, published as an attachment to Chapter 16 by the Township of Warren.
- Warren Township 2026 adopted ordinance record: 26-06 through 26-11 and 26-14 (affordable housing districts and development fee), 26-19 (data centers), as covered with citations in the linked reporting.
- Fourth Round mediation agreement and fair share plan, as covered in the linked reporting.
- Planning Board and Zoning Board of Adjustment reorganization minutes, January 12, 2026.
- Garden State MLS closed sales for Warren Township matched to the county parcel record, five years through August 2026. Zone level medians are original analysis.
Updated August 21, 2026. This page is refreshed as ordinances are adopted and as the pipeline moves. Where this page and a Township document disagree, the document governs and this page is wrong.
Warren Township resident and full time broker, licensed in New Jersey since 2002. Warren, Local. is written from live Garden State MLS data, township records and primary sources. Every figure is traceable to a source listed above.