
Montgomery County MD Electrical Codes: Homeowner Compliance Guide
Montgomery County electrical-code and permit guidance: county amendments, Rockville/Gaithersburg boundaries, homeowner...

Upgrading Gaithersburg homes with safer, more efficient power. Request a free estimate for your installation, or describe the problem for a diagnostic and repair visit.
From routine repairs to major installations, our licensed electricians provide comprehensive electrical services to Gaithersburg homes and businesses. Quoted electrical installations include a five-year workmanship warranty; manufacturer equipment warranties are separate.
Property-specific electrical panel replacement and service-capacity planning, with load calculations, utility coordination, labeling, and permit-path confirmation.
Electrical hookups for customer-owned or dealer-supplied portable generators and battery equipment, including compatible transfer equipment and inlet connections.
Replace faulty, tripping, or outdated circuit breakers for reliable power distribution.
Property-specific branch-circuit installation for appliances, workshops, offices, and specialty equipment, sized to the connected load and existing panel.
Upgrade your home's electrical service from the utility meter to the main panel.
Listed home battery and wall-pack installation with panel integration, transfer equipment, circuit selection, and permit-path confirmation.
Smart panel and smart-breaker installation for circuit-level monitoring, load management, and battery or EV coordination.
Recessed lighting planned around the room, ceiling access, fixture ratings and compatible dimming. Request a free estimate for a defined installation scope.
Property-specific outdoor and landscape lighting for paths, entries, architecture, patios, and gardens, with weather exposure and control needs evaluated on site.
Chandelier installation planned around fixture weight, mounting support, ceiling height and safe access. Send the model and room photos before arranging the work.
Dimmer and switch upgrades matched to your lights, wiring and control locations. We check compatibility before recommending a replacement.
Automated motion-activated lighting for security, convenience, and energy savings.
Panel-mounted surge protective device installation with equipment compatibility, conductor path, grounding, bonding, and status-indicator review.
Accessible residential electrical-system review with a written, photo-supported record of observed conditions and clearly stated inspection limits.
GFCI outlet installation and replacement with grounding, circuit and location checks. A planned replacement and an unexplained trip need different service requests.
Hardwired, interconnected smoke and CO detectors for maximum life safety.
Bring your home's electrical system up to current NEC code standards.
Home Level 2 EV charger installation with panel-capacity review, circuit planning, equipment connection, testing, and permit coordination for the defined scope.
Integration for smart switches, thermostats, and video doorbells.
Upgrade your outlets with built-in USB-A and USB-C charging ports.
Monitor electrical consumption and control selected loads with compatible lighting, timers, sensors, and smart electrical equipment.
Specialized wiring for kitchen remodels, appliances, and lighting.
Ceiling-fan installation and replacement with support, clearance, wiring and control checks. Tell us whether you are replacing a fan or adding one at a light location.
Bathroom exhaust-fan replacement starts with the existing opening, wiring and duct route. The estimate separates electrical work from ventilation and exterior repairs.
Safe, code-compliant electrical wiring for swimming pools, hot tubs, and spas.
Professional in-wall wiring for home theaters, media rooms, and entertainment systems.
Accessible aluminum branch-circuit evaluation and property-specific corrective work for documented connections or a defined copper-replacement scope.
Accessible knob-and-tube wiring evaluation and phased or defined replacement planning for older homes, with access and finish boundaries documented.
Diagnostic service for power loss, flickering, dead outlets, repeated tripping, heat, noise, and other residential electrical symptoms.
Need an emergency electrician now? Our 24/7 line is answered live at (571) 444-6886 for sparking panels, burning smells, and storm damage across Northern Virginia.
Honest light-commercial electrical for Northern Virginia businesses: offices, retail, restaurants, and tenant fit-outs. Request a commercial estimate.
Solar panels installed by the electricians who already do your panel, battery, and EV charger. From $2.40/W installed, with a master electrician on site.
Neighborhoods We Serve
Send your complete address, work description and any building-access requirements. Our team reviews the request and confirms availability before a visit is scheduled.


Staff confirm scope and availability
View detailed electrical service information for specific neighborhoods in Gaithersburg.
AJ Long Electric proudly serves Gaithersburg and surrounding areas.Call (571) 444-6886 for service in your area.
Local Service Area
Use your address and property details to plan the work. Nearby landmarks help describe the area, but do not establish electrical conditions, permit jurisdiction or installation requirements.
Area landmark
Rio Lakefront
Area landmark
Kentlands
Area landmark
Seneca Creek State Park
Area landmark
Olde Towne
Area landmark
Bohrer Park
Area landmark
Gaithersburg Community Museum
Area landmark
NIST Campus
Area landmark
Lakeforest Mall
Historic Olde Towne property electrical updates
New Urbanist home smart home integration
Technology professional home office requirements
Panel upgrades in 1970s-1990s neighborhoods
EV charging for tech corridor commuters
Commercial electrical for Rio mixed-use properties
GFCI/AFCI updates throughout older homes
Landscape lighting for community-standard compliance
Confirm the actual property jurisdiction and scope before deciding which permits or inspections apply. New circuits and service changes differ from like-for-like replacements. The authority determines the requirements for your project.
| Project | Planning Step | What It Means |
|---|---|---|
| Panel upgrade (e.g. 100A to 200A) | Confirm permit path | Replacing or upsizing the main electrical panel that distributes power throughout your home. |
| EV charger installation | Confirm permit path | Adding a dedicated 240V circuit for a Level 2 home electric-vehicle charger. |
| New circuits & rewiring | Confirm permit path | Identify the proposed circuit work and any changes to walls or protected assemblies. |
| Like-for-like fixture or device swap | Check exemptions | Confirm whether the exact replacement qualifies for an exemption; protected assemblies or other scope can change the requirement. |
Your written scope should identify permit and inspection coordination. For state trade licensing, see the Maryland Board of Master Electricians. Check master electrician licensing and Maryland electrical code requirements through the Department of Labor.
About Our Gaithersburg Services
Gaithersburg, Maryland offers exceptional diversity, from the historic charm of Olde Towne to the New Urbanist community of Kentlands to the technology employment hubs along I-270. This variety creates diverse electrical service needs that AJ Long Electrical addresses with comprehensive expertise developed over decades of service throughout Montgomery County.
Olde Towne Gaithersburg contains beautifully preserved historic homes dating from the 19th century that require careful electrical updating. These properties need electricians who understand both the technical requirements of code-compliant systems and the preservation considerations for architecturally significant buildings. We approach these homes with respect for their heritage while ensuring modern safety and functionality.
Kentlands and Lakelands represent pioneering New Urbanist developments that combine traditional architectural styles with contemporary home expectations. These homes typically feature more recent electrical systems but benefit from updates including smart home integration, EV charging, and additional circuits for home offices that have become essential for many residents.
The technology corridor along I-270 employs many Gaithersburg residents who appreciate innovation in their homes as well as their work. These homeowners request cutting-edge electrical systems including comprehensive home automation, whole-house audio, dedicated home theater circuits, and EV charging. We stay current with emerging technologies to serve these forward-thinking clients.
The Rio Lakefront development has transformed the Washingtonian Center area into a vibrant mixed-use destination. We serve both the residential properties throughout Rio and the commercial establishments that have made this area a regional attraction, understanding the different requirements of each property type.
Gaithersburg's diverse housing stock includes significant development from the 1970s through 1990s in neighborhoods like Quince Orchard, Montgomery Village, and Shady Grove. These homes commonly need panel upgrades, GFCI/AFCI updates, and additional circuits to meet modern demands while remaining comfortable family homes for new generations.
AJ Long Electrical serves Gaithersburg with the same commitment to quality and professionalism we bring to every community. When Gaithersburg families need electrical service, they choose the contractor who treats every project as an opportunity to demonstrate excellence.
Fully licensed in Maryland with comprehensive liability insurance for your protection.
1,463 Google reviews across our four business profiles.
Call to confirm the current response window for Gaithersburg; urgent safety concerns are prioritized during business hours.
Frequently Asked Questions
Get answers to the most frequently asked questions from Gaithersburg homeowners about our electrical services.
AJ Long Electric serves Gaithersburg. Our family-owned company has been in business since 1996. Send the property address and work description so our team can review scope, access and availability.
Permit requirements depend on the property jurisdiction, building and electrical scope. The written proposal should identify required permit and inspection coordination. The local authority controls review, corrections and final approval; a mailing city alone may not identify the correct office.
We accept requests for Gaithersburg and nearby areas, including Kentlands, Lakelands, Olde Towne. Provide your complete address and access details; staff confirm the next step and available visit window after reviewing the request.
For urgent electrical hazards in Gaithersburg, call (571) 444-6886. During business hours, we prioritize safety-related calls and confirm the available response window with you. If you see fire or an immediate threat to life, call 911 first.
Describe the desired change or symptom, provide the equipment model if known, and include photos taken safely with covers closed. Note access restrictions, prior renovations and other loads you plan to add. A home’s age or neighborhood alone does not establish its wiring condition or need for an upgrade.
Estimates are free, with no fee for the visit or the written price. For a panel upgrade, EV charger installation, whole-house rewiring, or another project, request an appointment so we can document the property-specific scope.
AJ Long Electric is a licensed and insured electrical contractor for work in Maryland. John Long is the company founder and Master Electrician, and the company maintains the licenses required for its work. You can verify our credentials before authorizing your Gaithersburg project.
In addition to Gaithersburg, AJ Long Electric provides professional electrical services to these nearby communities in Maryland and the greater DMV region.
Proudly serving Gaithersburg and surrounding areas including Rockville, Germantown, Potomac. Our electricians are licensed to work throughout Northern Virginia, Maryland, and Washington DC.
For fire or an immediate threat to life, call 911 first. Keep clear of damaged equipment and downed wires. For an urgent electrical concern, call us so staff can review the issue and confirm the available response window.
● Average response time: < 2 hours for emergencies
Expert Tips
Helpful guides and advice from our licensed electricians who serve the Gaithersburg area.

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AJ Long Electric is your trusted licensed electrician in Gaithersburg, Maryland. We proudly serve neighborhoods including Kentlands, Lakelands, Olde Towne, Quince Orchard, Washingtonian, and areas near Rio Lakefront, Kentlands, Seneca Creek State Park. Serving ZIP codes: 20877, 20878, 20879, 20882, 20886. Call (571) 444-6886 to request an estimate for electrical services in Montgomery County.