What a Maryland panel upgrade actually includes
A "panel upgrade" usually means more than just swapping the breaker box. In Maryland, a full residential service upgrade includes the meter base, service entrance cable, main breaker panel, grounding electrode system, bonding to water and gas, surge protection, and the labor to re-terminate every branch circuit. Permit fees, Pepco or BGE coordination, and a Montgomery County DPS or Anne Arundel inspection are part of the price too.
Typical 2026 pricing in Maryland
Across Bethesda, Potomac, Rockville, Chevy Chase, and Silver Spring, we see most projects fall into these bands:
- 100A to 200A overhead service upgrade: $2,800 – $4,500
- 200A panel-only replacement (service stays): $2,200 – $3,400
- 400A or dual-200A service: $6,500 – $11,000
- Federal Pacific or Zinsco panel replacement: $2,600 – $4,200
- Add whole-home surge protection: +$400 – $700
- Add EV-ready 60A circuit at the same time: +$650 – $1,200
Older homes near downtown Bethesda or in Kensington often need new grounding electrodes and a rebuilt service mast — add $400–$900. Detached-garage feeders are a separate scope.
Timeline and permits
Montgomery County DPS plan review for a like-for-like upgrade is typically same-week. The active work day runs 6–10 hours with power off for 3–5 hours of that. Inspection is usually within 1–3 business days, and most jobs pass on the first visit when the work is done by a licensed Maryland master electrician.
Signs your panel needs an upgrade
- Federal Pacific Stab-Lok or Zinsco brand panel
- Cloth-jacketed service entrance cable or aluminum branch wiring
- Breakers that won't reset, hot to the touch, or that hum
- Burn marks, rust, or moisture in the panel
- No room for new circuits when adding an EV charger or hot tub
- Frequent flickering across multiple rooms during AC startup
Why upgrade to 200A specifically
A 100A service is no longer enough for an EV charger, induction range, heat pump, and high-draw appliances together. The 200A standard gives headroom for at least one Level 2 EV charger, modern HVAC, and future loads like battery backup or a second EV. For larger Potomac and Bethesda homes with multiple HVAC systems, dual-200A or 400A is more appropriate.
What to ask a Maryland electrician before signing
- Are you licensed as a Maryland master electrician (not just "insured")?
- Will you pull a permit and meet the county inspector on site?
- Is the meter base, surge protector, and grounding rebuild included?
- Will you label every breaker on a printed directory?
- Is the price firm in writing, or "starting at"?
If you want a written estimate from a licensed electrician in Maryland, Washington DC, or Northern Virginia, call Flash Power LLC at (202) 926-7065 or request a free quote.