Decision helpers
Decision helpers for your home’s electrical system
A calculator gives you a number. A decision helper gives you a next step. Pick the answers that fit your home, and you see what to do and why. Free, no sign up, and the rules behind every result are shown on the page.
Should you rewire your old house?
For anyone who owns or is buying an older home. Start with the inspection report, then choose what you can see: wiring type, grounding, panel, and warning signs. You learn whether to plan a rewire, fix specific items, or leave the wiring alone.
Do you need a service upgrade?
For anyone adding an EV charger, a heat pump, or electric appliances. The helper compares your service with a simplified demand estimate. How fast the car must charge often decides the most.
What will the inspection findings cost to fix?
For buyers, sellers, and agents with a home inspection report in hand. Check the electrical findings, from problem panels to missing GFCIs, and get a low and high repair estimate for your area. Useful when you negotiate a repair credit.
How to read a result. A decision helper is a first estimate based on your own answers. It cannot see your wiring or measure anything. Have a licensed electrician confirm it before you spend money, and remember that your local electrical inspector has the final word.
Want a number instead? For voltage drop, circuit load, fault current, and EV charging time, use the calculators.
Want the background? The guides explain the rules behind each helper in plain language.