Intercom System Permit Requirements in New Hampshire

New Hampshire has a unique approach to low voltage licensing - it's the circuit type, not the voltage, that determines licensing requirements. Signaling circuits like intercoms are generally exempt from electrical licensing. Here's what contractors need to know about intercom installation in the Granite State.

State Licensing Overview

The New Hampshire Electricians' Board under the Office of Professional Licensure and Certification takes a circuit-type approach to licensing:

Key Principle

It is not the voltage that determines licensing requirements - it is the type and purpose of the circuit.

• Licensed work: Electrical installations for heat, light, and power purposes (regardless of voltage)
• Exempt work: Signaling circuits including fire alarms, security systems, telecommunications

What's Exempt from Licensing

Under RSA 319-C, the following do not require electrical licensing in New Hampshire:

• Intercom and door entry systems
• Fire alarm installations
• Security and burglar alarm systems
• Telecommunications wiring
• Data and network cabling
• Audio/video systems

What DOES Require Licensing

An active New Hampshire Electrician license is required for:

• Work with 30 volts or higher for heat, light, or power purposes
• Standard electrical circuits
• Power distribution
• Lighting systems

Reciprocity

New Hampshire has a reciprocity agreement with Massachusetts for electrical licenses. This is relevant if you hold a Massachusetts Systems license and want to work in New Hampshire, though signaling circuits don't require licensing in NH.

Local Requirements

While state licensing isn't required, local jurisdictions may have their own requirements:

Manchester

Manchester's Building Department may require permits for commercial low voltage work as part of larger construction projects. Standalone intercom installations typically don't require permits.

Nashua

Nashua follows state guidelines and doesn't require licenses for signaling circuits. Commercial projects may need permits as part of overall building permits.

Concord

As the state capital, Concord follows NH guidelines. Commercial construction projects typically include low voltage in the overall permit scope.

Portsmouth

Portsmouth follows state exemptions for signaling circuits. Check with the Building Department for commercial permit requirements.

When Permits MAY Be Required

Scenario	Permit Required?	Notes
Residential video doorbell	No	Signaling circuit, exempt
Residential intercom	Usually No	Exempt from licensing
Commercial intercom	Check Locally	May be part of building permit
New construction	Yes	Included in building permit
Fire alarm	NFPA 72	Exempt from licensing but code applies

Code Compliance

While licensing isn't required, installations must still comply with:

• National Electrical Code (NEC): Article 725 for Class 2 and Class 3 circuits
• NFPA 72: For fire alarm systems
• Building codes: Applicable local and state building codes
• Manufacturer specifications: Equipment must be installed per manufacturer instructions

2026 NEC Update

Starting with the 2026 NEC, all licensed NH Electricians will be required to complete the Code Update in the same year it was published. This applies to licensed electrical work, not exempt signaling circuits.

Commercial vs Residential

Residential Intercom

• No state license required (signaling circuit)
• Permits usually not required for standalone
• New construction includes in building permit
• Must comply with NEC

Commercial Intercom

• No state license required (signaling circuit)
• Local permits may be required
• Part of overall construction permit scope
• Professional installation recommended

Installation Best Practices

1. Understand the exemption: Signaling circuits are exempt; heat/light/power are not
2. Check local requirements: Verify permit needs with local building department
3. Follow NEC: Comply with Article 725 for Class 2/3 circuits
4. Document work: Keep records for warranty and liability
5. Carry insurance: Good business practice regardless of licensing

Related Permits You May Need

• Access Control Permits in New Hampshire
• Security Camera Permits in New Hampshire
• Fire Alarm Permits in New Hampshire

Frequently Asked Questions

Do I need a license to install intercoms in New Hampshire?

No, intercom systems are signaling circuits and exempt from electrical licensing in New Hampshire. The state licenses work for heat, light, and power - not signaling circuits.

Do I need a permit to install a Ring doorbell in New Hampshire?

No, video doorbells are signaling circuits and don't require licenses or permits in most NH jurisdictions.

Can a homeowner install their own intercom system?

Yes, homeowners can install signaling circuit equipment without licensing or permits in New Hampshire.

What if I need to run 120V power for the system?

If you need to install electrical circuits for power (not signaling), that work requires a New Hampshire Electrician license.

Find Intercom Projects in New Hampshire

Looking for intercom installation opportunities in New Hampshire? LVN Signal tracks construction permits and bids across New Hampshire, alerting you to projects the moment they're filed.

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Last updated: February 2026. Contact the NH Office of Professional Licensure and Certification Electricians' Board at (603) 271-2219 for current requirements.