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Zoning Guide

Johnston Zoning & Land Use Guide

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Key Zoning Facts

Planning Department
Town of Johnston Planning Department(401) 351-6618
Building Code Edition
RI State Building Code (IBC/IRC based)
ADUs Allowed
Yes
Primary District
R-40 — Residential 40
Max Height
35 ft

Johnston Zoning Overview

Johnston is a town of approximately 29,568 residents in Providence County, Rhode Island. The town manages land use and development through its local zoning ordinance, which divides the municipality into districts regulating permitted uses, building heights, lot sizes, setbacks, and density.

Johnston's zoning code includes three primary residential districts: R-40 (40,000 sq ft minimum lot), R-20 (20,000 sq ft minimum), and R-15 (15,000 sq ft minimum). The R-20 district has setbacks of 25 feet (front), 10 feet (side), and 20 feet (rear). The town also has business districts (B-1 and B-2) and an Industrial (I) district.

ADU Rules

Under Rhode Island state law (RI Gen. Laws 45-24-73), all municipalities are required to allow Accessory Dwelling Units (ADUs). Johnston must comply with this statewide mandate. Contact the Town of Johnston Planning Department at (401) 351-6618 for local implementation details, permit requirements, and any applicable dimensional standards.

Development Process

Development in Johnston generally requires obtaining the appropriate permits from the town's planning and building departments. The process typically involves:

  1. Zoning Verification — Confirm that your proposed use is permitted in the applicable zoning district
  2. Site Plan Review — For commercial and multi-family projects, submit a site plan for review
  3. Building Permit — Apply for a building permit with construction documents compliant with the RI State Building Code
  4. Inspections — Schedule required inspections during construction
  5. Certificate of Occupancy — Obtain final approval before occupying the structure

For projects that do not conform to existing zoning, property owners may need to seek a variance, special exception, or rezoning through the local zoning board of review or planning board.

Key Considerations

Before starting any development project in Johnston, property owners should:

  • Verify the zoning classification of their property
  • Review setback, height, and lot coverage requirements for the applicable district
  • Check for any overlay districts or special regulations
  • Determine if the property is in a flood zone using FEMA's flood map service
  • Confirm whether HOA covenants or deed restrictions apply
  • Contact the planning department at (401) 351-6618 for pre-application guidance

Disclaimer: This guide provides general information about zoning in Johnston and should not be relied upon as legal advice. Zoning codes are subject to change. Always verify current regulations with the Town of Johnston planning department or municipal code before making development decisions.

Regulatory Layers That Apply in Johnston

Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.

Federal

State — Rhode Island

  • Building Code: RI State Building Code (SBC-1 through SBC-8)
  • State ADU Override: Yes (RI Gen. Laws 45-24-73 allows ADUs statewide)
View Rhode Island zoning overview

County — Providence County

  • Role: County-level property records, tax assessment

City / Municipal

The city's zoning ordinance, building codes, and local permits form the primary layer of land-use regulation for your property.

Overlay Districts

No overlay districts identified.

Private Restrictions

  • HOA / CC&Rs common: Yes
  • Check HOA CC&Rs and deed restrictions for additional requirements.

Primary Zoning Districts

R-40Residential 40
Min Lot
40,000 sq ft
Max Height
35 ft
Front Setback
Varies
Side Setback
Varies
Rear Setback
Varies
R-20Residential 20
Min Lot
20,000 sq ft
Max Height
35 ft
Front Setback
25 ft
Side Setback
10 ft
Rear Setback
20 ft
R-15Residential 15
Min Lot
15,000 sq ft
Max Height
35 ft
Front Setback
20 ft
Side Setback
8 ft
Rear Setback
15 ft
B-1Business 1
Min Lot
Varies
Max Height
Varies
Front Setback
Varies
Side Setback
Varies
Rear Setback
Varies
B-2Business 2
Min Lot
Varies
Max Height
Varies
Front Setback
Varies
Side Setback
Varies
Rear Setback
Varies
IIndustrial
Min Lot
Varies
Max Height
Varies
Front Setback
Varies
Side Setback
Varies
Rear Setback
Varies

ADU Rules in Johnston

ADUs:Allowed

Permit Costs & Timelines

Permit Costs & Timelines

Specific permit fee schedules for Johnston are available from the local planning department. Fees vary based on project type, scope, and valuation.

Check Johnston permit fees →

Official Sources

Town of Johnstontownofjohnstonri.comOfficial sourceJohnston Municipal Codelibrary.municode.comOfficial source

Frequently Asked Questions

How do I find the zoning for my property in Johnston?
Contact the Town of Johnston Planning Department at (401) 351-6618 or visit https://www.townofjohnstonri.com/. You can also review the municipal code for zoning district descriptions and permitted uses.
What building code does Johnston follow?
Johnston follows the RI State Building Code (SBC-1 through SBC-8), which is based on the IBC/IRC. Contact the local building department for specific requirements.
Can I build an ADU in Johnston?
Yes. Rhode Island state law (RI Gen. Laws 45-24-73) requires municipalities to allow ADUs. Contact the planning department for local implementation details and permit requirements.
Do I need a permit for home improvements in Johnston?
Most structural modifications, additions, and changes of use require a building permit. Contact the Johnston building department for specific requirements.