A panel and an electrical service are different parts of the system
The panel distributes electricity to property circuits. The service is the incoming supply and associated equipment. Replacing a panel does not automatically increase the available supply. A Licensed Electrical Contractor should assess existing condition and demand, planned loads and the utility requirements before recommending equipment. Spare breaker spaces alone do not establish capacity.
Prepare the scope for your Stouffville property
Prepare the current equipment schedule and any builder or prior electrical records you have. Separate new circuit space from a need for greater electrical supply and identify which condition prompted the request.
Ask why the proposed upgrade is needed and what alternatives were considered. If a builder or warranty matter is involved, clarify responsibility before commissioning work that changes the existing installation.
What should the assessment establish?
For a Stouffville home with existing construction records, use those documents to establish the original installation assumptions while still having the present equipment assessed. A record of service size or planned circuits does not establish the condition of every component today. Ask whether the proposed addition is within the assessed installation or needs a different design. If there is also a concern about original work, clarify whether it belongs in a builder process before altering it. Separate that responsibility from the new project so one quote is not expected to settle two different matters.
Questions before you agree to work
Does every new load need a larger service?
No universal service size applies to every project. The contractor must assess the existing system and proposed demand, and explain whether a service change, another design or no capacity change is appropriate.
Who arranges utility and ESA steps?
Confirm this in the written scope. Service work may need utility coordination as well as ESA notification and review. Ask the contractor what they arrange and what the owner must supply or authorize.