Intercom System Permit Requirements in South Dakota

Do you need a permit to install intercom systems in South Dakota? The Mount Rushmore State has contractor-friendly regulations that exempt most low voltage work from electrical licensing requirements. Understanding what's required helps contractors serve customers in Sioux Falls, Rapid City, and across the state.

State Licensing Overview

South Dakota's electrical licensing is administered by the South Dakota Electrical Commission. The state specifically exempts low voltage work from most requirements.

Key Exemption Language

South Dakota law exempts from electrical licensing:

"Alarm and communication companies that are engaged in work on alarm and communication systems, if the work is limited to Class 2 and Class 3 circuits and signaling circuits as defined in the National Electrical Code."

This exemption covers:

• Intercom systems (Class 2 circuits)
• Alarm systems
• Communication systems
• Signaling circuits
• Low voltage wiring under 50V

What This Means for Contractors

• No state license required for intercom installation
• No permit required for standalone intercom work
• Business license only - standard city/county business registration
• NEC compliance still required - Article 725 for Class 2/3 wiring

When Work MAY Require Licensing

While intercoms are exempt, certain scenarios may trigger licensing requirements:

Scenario	License Required?	Notes
Standalone intercom system	No	Class 2 exemption applies
Video doorbell installation	No	Consumer electronics
Commercial audio intercom	No	Still Class 2/3 circuits
Intercom with 120V power	Maybe	If running line voltage, yes
Fire alarm integration	Contact AHJ	Life safety may have requirements
New construction rough-in	Maybe	May be under electrical permit

Major Cities in South Dakota

South Dakota's major cities follow the state exemption for low voltage work:

Sioux Falls

As South Dakota's largest city, Sioux Falls has the most active construction market. The city does NOT require permits for low voltage intercom installations. Business registration through the city is the only requirement. Building permits are needed for new construction, but low voltage work is typically covered under the general building permit without separate electrical licensing.

Rapid City

Rapid City follows state exemptions for alarm and communication systems. No special permits for intercom installation. Contact the Pennington County Building Department for projects requiring building permits. Low voltage contractors should carry general liability insurance for commercial work.

Aberdeen

Brown County and Aberdeen follow state rules. Low voltage work is exempt from electrical licensing. Business license through the city is standard practice. No special permits for intercom systems.

Brookings

Home to South Dakota State University, Brookings has institutional projects that may have their own contractor requirements. State rules apply for licensing, but university projects may require additional certifications or background checks.

Commercial vs Residential

Residential Intercom

Residential intercom work in South Dakota is largely unregulated:

• No state license required
• No permit required for standalone systems
• Homeowners can install their own systems
• Professional installation recommended for hardwired systems
• Must comply with NEC Article 725
• No inspection required for most installations

Commercial Intercom

Commercial installations follow the same exemption:

• No state license required for Class 2/3 work
• Building permits may be required for new construction
• General contractor may handle permit if part of larger project
• Insurance requirements may be specified by property owner
• ADA compliance required for accessibility features

National Electrical Code Compliance

While licensing isn't required, all installations must comply with the NEC:

Article 725 Requirements

• Class 2 Circuits: Most intercom systems fall here (under 30V, limited power)
• Wiring Methods: CL2 or CL2R rated cable required
• Separation: Keep separate from power circuits
• Penetrations: Firestop at rated assemblies

Article 800 Considerations

• Communication Circuits: May apply to certain intercom systems
• Grounding: Follow Article 800.100 for communications grounding
• Entrance Requirements: Protect against lightning and power contact

Business Requirements

While no electrical license is needed, standard business requirements apply:

Business Registration

• Register with South Dakota Secretary of State
• Obtain city/county business license where operating
• Sales tax license if selling equipment

Insurance

• General Liability: Recommended minimum $500,000
• Workers' Compensation: Required if you have employees
• Vehicle Insurance: Commercial auto for service vehicles

Certifications (Voluntary)

While not required in South Dakota, certifications demonstrate professionalism:

• NICET: Fire Alarm and related systems certifications
• ESA: Electronic Security Association training
• NTS: National Training School for alarm technicians
• Manufacturer Training: Aiphone, 2N, Doorbird, etc.
• BICSI: For structured cabling integration

Installation Best Practices

1. Use proper cable: CL2/CL2R for in-wall Class 2 circuits
2. Maintain separation: Keep away from power wiring
3. Document installation: Provide as-built drawings
4. Test thoroughly: Verify all stations and features
5. Train the user: Show operation to property owner
6. Leave documentation: User manuals and warranty info

Working in Neighboring States

If you work across state lines, be aware of different requirements:

• Minnesota: Requires Power Limited Technician (PLT) license
• North Dakota: Similar exemptions to South Dakota
• Montana: Exempts work under 90V from licensing
• Wyoming: No statewide licensing for low voltage
• Nebraska: Similar exemptions for Class 2 work
• Iowa: Check local jurisdiction requirements

Frequently Asked Questions

Do I need any license to install intercoms in South Dakota?

No state electrical license is required. You need only a standard business license to operate. South Dakota exempts alarm and communication companies working on Class 2/3 circuits from electrical licensing.

Can homeowners install their own intercom systems?

Yes. Homeowners can install intercom systems in their own residence without any license or permit. Professional installation is recommended for hardwired systems to ensure proper operation.

Do I need a permit for commercial intercom installation?

Standalone intercom installations don't require permits. If the intercom is part of new construction, it may be covered under the building permit. Check with the local building department for specific projects.

What insurance should I carry?

While not legally required, carrying general liability insurance ($500,000+) is standard practice and often required by commercial customers. Workers' compensation is required if you have employees.

Does South Dakota require alarm contractor licensing?

No. Unlike many states, South Dakota does not have a separate alarm contractor license. The exemption for Class 2/3 circuits covers alarm systems as well as intercoms and communications.

Related Permits You May Need

• Access Control Permits in South Dakota
• Security Camera Permits in South Dakota
• Fire Alarm Permits in South Dakota

Find Intercom Projects in South Dakota

Looking for intercom installation opportunities in South Dakota? LVN Signal tracks construction permits and bids across the Mount Rushmore State, alerting you to projects the moment they're filed.

Explore Signal

Last updated: February 2026. Requirements may change. Always verify with the South Dakota Electrical Commission and local building departments before beginning work.