Service size · specialist guide
200 amp electrical service
What a 200A residential service does, how it differs from a panel replacement and what evidence sets the project scope.
Short answer
A 200A service is a nominal supply rating, not a recommendation for every home. The decision starts with the existing service, the applicable load calculation, planned equipment, condition of the full service path and the serving utility's requirements.
Key takeaways
01A 200A-rated panel alone does not make a 200A service.
02The number on a visible breaker is a clue; the full installation needs verification.
03A written scope should separate contractor, permit, utility and restoration work.
What the 200A number actually describes
The service rating describes the supply available when the service conductors, metering equipment, disconnect, panel and utility connection are configured and approved for that rating. A panel label describes equipment capability; it does not establish what the property is being supplied with.
If a home has multiple mains, shared metering, an older service arrangement or unclear labels, record the rating as unknown. A qualified electrical contractor can verify the equipment and the utility can confirm its side of the connection.
Panel replacement and service increase are different projects
A panel replacement can address equipment condition, organization or breaker spaces while retaining the existing service capacity. A service increase may also involve a meter base, mast or underground lateral, service conductors, grounding and bonding, utility work and a temporary outage.
Ask each bidder to mark those components included, excluded or subject to site and utility confirmation. This makes a panel-only price comparable with another panel-only price, and exposes where a full-service quote has a wider scope.
Plan the loads before selecting the target
An EV charger, heat pump, electric backup heat, hot tub, suite or workshop can change demand in different ways. Equipment ratings, existing major loads and the applicable calculation matter more than a single appliance label. Approved load management can be worth assessing for suitable equipment, but availability depends on the installation and local authority.
Bring a near-term and longer-term equipment plan to the contractor. That helps distinguish a current project from future capacity preferences without declaring an upgrade necessary from a questionnaire or pressure score.
Permit and utility handoffs
The electrical contractor should identify the permit holder, inspection path and utility request before promising an installation date. Service changes may require the utility to review supply feasibility or arrange a disconnect and reconnect.
For Calgary, the City publishes contractor permit guidance and ENMAX publishes project intake and temporary disconnect information. Those are local examples, not a national rule; verify the corresponding authority and utility where the home is located.
What to collect before requesting quotes
Record the visible main-breaker marking without opening a cover; photograph only closed, safely accessible equipment. Note whether the supply appears overhead or underground, where the panel and meter are, the equipment you plan to add and any prior electrical documents you have.
Ask for the calculation, equipment schedule, utility assumptions, permit and inspection responsibilities, restoration allowances and closeout documents in writing. The Capacity Check can organize those questions, but it does not replace a site assessment.
Decision table
What the evidence changes
- 200A rating
- Nominal service capacity when the full path supports it
- Panel-only change
- May leave available service capacity unchanged
- Capacity decision
- Applicable load calculation and site assessment
- Utility question
- Can the serving utility support the proposed change, and what work is required?
- Quote comparison
- Match included, excluded and provisional items
Typical project sequence
From question to documented work
- 01Document the visible service clues
- 02List existing and proposed equipment
- 03Complete the applicable calculation
- 04Confirm utility and permit scope
- 05Compare written quotes
- 06Inspect and retain closeout records
Sequence and responsibilities vary by jurisdiction, utility and scope.
Evidence
Sources and verification
Published by the 200AmpPanel.ca Research Team, a HAUSE specialist property. Updated 2026-09-27.
Questions
Frequently asked
Does a 200A panel mean I have 200A service?
No. The panel's equipment rating may differ from the service supplied to the property. Have the full service path verified before relying on that number.
What should I do next?
Use the Capacity Check to organize what you know, then have a qualified electrical contractor complete the assessment required for the property and jurisdiction.
Your next step
Bring the right facts to the first conversation.
Record the visible service clue, planned equipment and any relevant documents. The free brief organizes your questions; a qualified person verifies capacity and scope.