Part of Washington Trade Network

Electrical panel FAQ for homeowners

Answers to electrical panel replacement, capacity, cost and installation questions, with practical next steps and sources.

32 homeowners answers

Browse all 32 questions
How much does an electrical panel upgrade cost in Washington?Why are two panel replacement estimates so different?What should a panel upgrade estimate include?Does requesting an estimate guarantee an electrician or a quote?Does an old panel automatically need to be replaced?Can I remove the panel cover to photograph the breakers?What is the difference between replacing a panel and upgrading electrical service?Can I replace a panel without increasing the home’s service capacity?Does every older Washington home need 200 amp service?How do I know whether my project needs 200 or 400 amp service?Does a 400 amp service mean I will have one 400 amp panel?Will a subpanel give my home more electrical service capacity?Will installing an EV charger require a service upgrade?Does an almost-full breaker panel mean I cannot add an EV charger?What changes if the EV charger will be in a detached garage?What electrical details should I get from my heat-pump contractor?Should I assess an EV charger and heat pump together?Does moving my electrical panel also move the meter?Does a Seattle panel upgrade need a City of Seattle permit or an L&I permit?If Seattle City Light supplies my power, does Seattle issue my electrical permit?Does replacing an electrical panel in Washington require a permit and inspection?Could a panel project need a building or mechanical permit too?Can my electrician move or disconnect a PSE meter?Does Tacoma Power handle both the electrical permit and utility work?Who schedules the utility disconnect and reconnect for panel work?How long will my power be off during a panel upgrade?Are utility charges included in my panel upgrade estimate?Does a panel replacement estimate include drywall or wall repair?What records should I receive after panel work is complete?Do solar panels or a home battery always require a new electrical panel?Does a battery need utility approval if I only want backup power?Can I connect a portable generator to my existing panel?

Homeowners · Answers 1–8 of 32 · Page 1 of 4

How much does an electrical panel upgrade cost in Washington?

This Old House’s March 31, 2026 national cost guide lists $1,300–$3,000 for a 100-to-200-amp upgrade, with the table describing a 200-amp panel plus installation. That figure is a budget reference, not a Washington average or contractor bid, and it does not itemize all service or utility costs.

  • Meter changes, utility charges, permits, trenching, and restoration may add cost locally.
  • Compare written scopes for the same equipment, service capacity, and site work.
Sources & answer link

Reviewed October 17, 2026. Link to this answer

Why are two panel replacement estimates so different?

Estimates can describe different work, such as a panel exchange, new service conductors, meter changes, utility engineering, permits, trenching, or wall repair. Compare each line item and allowance before treating the lower total as the same project.

  • Check service rating, equipment, circuits, grounding, and permit responsibility.
  • Ask what can change after the site visit and how a change order is approved.
Sources & answer link

Reviewed October 17, 2026. Link to this answer

What should a panel upgrade estimate include?

A useful estimate identifies the equipment, circuit work, service capacity, permit and inspection responsibilities, utility coordination, outage plan, and restoration. It should also state which charges or tasks are excluded so you can compare proposals on the same scope.

  • Request separate lines for meter or utility work and site restoration.
  • Keep the accepted scope, allowances, change-order terms, and closeout records together.
Sources & answer link

Reviewed October 17, 2026. Link to this answer

Does requesting an estimate guarantee an electrician or a quote?

A request is not a binding quote, appointment, or promise of contractor availability; Washington Panel Pros reviews the scope and location, then may coordinate a handoff to a potential contractor. You decide whether to contract directly with that contractor.

  • Include your ZIP code, project type, and useful equipment or inspection details.
  • Confirm scope, price, timing, and permit responsibilities with the contractor before agreeing.
Sources & answer link

Washington Trade Network participation policy; terms agreed before work.

Reviewed October 17, 2026. Link to this answer

Does an old panel automatically need to be replaced?

Age or a panel brand alone does not establish its condition or the right project. Have an electrician identify the equipment, document the concern, and explain whether the recommendation is repair, replacement, or a separate service-capacity change.

  • Share any inspection or insurance request with the electrician.
  • Compare the written finding with the exact equipment and proposed work.
Sources & answer link

Reviewed October 17, 2026. Link to this answer

Can I remove the panel cover to photograph the breakers?

No, leave the panel cover and meter equipment in place; photograph only the closed exterior or visible label, then let an electrician inspect the equipment. A photo cannot confirm the condition of internal connections or establish a safe repair.

  • Do not open the panel, handle conductors, or remove utility equipment.
  • Send the exterior photo with the address and the reason for the assessment.
Sources & answer link

Reviewed October 17, 2026. Link to this answer

What is the difference between replacing a panel and upgrading electrical service?

Panel replacement changes the home’s distribution equipment; a service upgrade changes the capacity or configuration supplying it. A project can involve both, but the estimate should identify which work is recommended and why.

  • A new panel label does not prove the utility service has more capacity.
  • Ask for a load assessment when adding significant equipment.
Sources & answer link

Reviewed October 17, 2026. Link to this answer

Can I replace a panel without increasing the home’s service capacity?

A panel replacement can keep the existing service capacity when the assessment supports that scope. Adding capacity is a separate decision based on planned loads, equipment, and utility requirements.

  • Have the contractor state whether capacity changes in the proposal.
  • List planned EV, heating, water-heating, or remodel loads before choosing equipment.
Sources & answer link

Reviewed October 17, 2026. Link to this answer