Should I include new loads or existing loads?
Include both. The point is to estimate the demand of the finished home after the renovation is done.
Checking electrical capacity for a renovation?
Use the calculator to estimate whether your renovation, addition, or basement project may push the home toward a service upgrade.
Why renovations uncover electrical limits
Renovations often bring together several load changes at once. A homeowner may be adding finished basement space, changing to an induction range, upgrading the laundry, or preparing for a future EV charger. None of those decisions happen in isolation. The demand estimate helps show whether the renovated home still fits the existing service size or whether the electrical scope is becoming more serious.
This matters because service changes are easier and cheaper to plan early. Once drawings, appliance purchases, and permit assumptions are locked in, discovering that the home likely needs a larger service can create expensive redesign and scheduling problems.
What to enter for a renovation estimate
Use the finished-condition information wherever possible. That means the floor area that will count after the renovation is complete and the equipment you expect to have at the end of the project. If you are keeping the existing range but adding a hot tub and electric heat to a new area, the estimate should reflect that combined future condition.
If you are still deciding between options, run the calculator more than once. Compare a lighter scenario with a higher-load scenario. That gives you a practical sense of whether certain decisions, like a tankless heater or a larger EV charger, are likely to change the service conversation.
What the result helps you decide
A renovation estimate helps you budget and sequence the project correctly. If the result points comfortably below the likely service size, you may be able to continue refining the renovation without treating the service as the main risk. If the estimate lands close to or above the current service, that is a clear signal to bring electrical review into the project sooner.
That early clarity is useful even when the answer is not final. It tells you whether the next best move is to keep designing, gather better nameplate information, or bring in an electrician for a more formal load review before permit decisions are made.
FAQ
Questions people ask before they run the estimate.
Do additions change the minimum service size?
They can. Above-grade floor area affects the service threshold, and larger renovated homes often bring more permanent appliance load at the same time.
What if I am still choosing appliances?
Use the best realistic ratings you have now. You can always rerun the calculator as the equipment list becomes more certain.
Can a basement renovation matter even if the service stays the same?
Yes. Basement area still affects the basic dwelling load and renovations often add new heating, cooking, laundry, or spa-type loads.
Related pages
Explore nearby planning scenarios.
Service Upgrade Planning
Use the calculator to estimate whether your current service may be undersized for the loads you want to add.
Home Buyer Planning
Use the calculator to compare a home's likely capacity against the loads you may want after you move in.
New Construction Planning
Use the calculator as an early-stage check before finalizing the major loads and service expectations for a new build.