How long does a panel upgrade take?

Most residential 100A-to-200A heavy-ups are completed in a single day, with power off for roughly 4–8 hours.

Do I need a permit for a panel upgrade?

Yes - every jurisdiction in MD, DC, and VA requires a permit and final inspection for service-equipment work. We handle both.

How do I know if I have a Federal Pacific or Zinsco panel?

Federal Pacific Stab-Lok panels usually say 'FPE' or 'Stab-Lok' on the cover. Zinsco panels often have colored breaker handles (red, blue, green). Send us a photo and we'll confirm.

Are you licensed to do panel upgrades in Frederick, MD?

Yes. Pirro Electric is fully licensed and insured to perform commercial and residential electrical work in Maryland, Virginia, and Washington, D.C., including Frederick. We pull all required permits and coordinate inspections with the local jurisdiction on every job.

Do you handle aluminum wiring remediation in Frederick?

Yes. Aluminum wiring remediation is one of our specialties for multi-unit buildings, condos, and single-family homes built in the late 1960s and 1970s throughout Frederick and the broader DMV. We rewire to copper, replace outdated panels, and document everything for insurance carriers.

Frederick, MD

Panel Upgrades in Frederick, Maryland

200-amp upgrades, heavy-ups, sub-panels, and Federal Pacific & Zinsco replacements - done to code and inspected.

Request a Free Quote (240) 510-3131

Licensed & insured 5.0 ★ on Google Family-owned since 2003

DC Electrical Contractor #EM-40-0001168 · MD Master Electrician #7987 · VA Class A Contractor #2705198087 · EPA & OSHA Certified

Panel Upgrades & Heavy-Ups in Frederick, MD - Pirro Electric

Homeowners and property managers across Frederick, Maryland rely on Pirro Electric for panel upgrades. Frederick's downtown historic district is full of 19th-century rowhomes with knob-and-tube remnants, undersized services, and old fuse boxes - work that requires permit coordination with the Historic Preservation Commission. Newer subdivisions on the east side need mostly EV chargers and panel replacements.

From Downtown Frederick, Worman's Mill, Spring Ridge, and Clover Hill, our licensed electricians deliver the same permitted, code-compliant work that has kept us in business across the DMV since 2003. 200-amp upgrades, heavy-ups, sub-panels, and Federal Pacific & Zinsco replacements - done to code and inspected.

Local Angle

Common Panel Upgrades & Heavy-Ups Projects in Frederick

Between jobs around Downtown Frederick Historic District and the neighborhoods above, our Frederick crew is on the road every week.

Historic home rewiring with HPC coordination
Service upgrades on 1900s rowhomes

Neighborhoods servedDowntown Frederick · Worman's Mill · Spring Ridge · Clover Hill

ZIP codes21701 · 21702 · 21703 · 21704

Scope of Work

What's Included

Every job in Frederick comes scoped, permitted, and inspected - no shortcuts.

100-amp to 200-amp service upgrades ("heavy-ups")
Federal Pacific Stab-Lok panel replacement
Zinsco panel replacement
Main breaker panel and meter base swaps
Sub-panel installation for additions and detached structures
Whole-home surge protection at the panel
Panel relabeling and circuit mapping
AFCI and GFCI breaker upgrades

FAQ

Panel Upgrades & Heavy-Ups in Frederick - Common Questions

Reviews

What Customers Say

Excerpts from verified Google reviews of Pirro Electric.

"We use Pirro across our portfolio of 50+ commercial retail buildings. Excellent work, responsive, priced competitively, and they get it right the first time."

Timothy M.

Google Review · Commercial Property Manager

"Pirro re-wired my whole townhouse, updated the panel, and replaced every outlet and switch. Professional, friendly, and on time. Couldn't ask for a better company."

JMW

Google Review · Verified Homeowner