Electrical decision guides
Three questions decide almost every residential electrical project: is there an active safety issue, is there enough capacity for what you will plug in over the next five years, and will the walls be open anyway. If the answer to the first is yes, act now. If only the second or third apply, you have time to get three quotes and plan the sequencing.
The decision framework is deliberately simple because the trade makes it easy to overspend. Active hazard first - smells, heat, scorch marks, whole-house flicker. Those are same-day calls, not projects.
Capacity second. A load calculation is the only credible input. It should account for what you intend to add, not just what exists, because the marginal cost of going up one service size while the panel is already off is much smaller than doing the job twice - This Old House shows 100-amp panel plus install at $800-$1,500 versus $1,300-$3,000 for 200-amp.
Timing third. Rewiring during a renovation avoids $1,000-$5,000 in wall repair, per HomeGuide. If a renovation is plausible within a couple of years and there is no safety issue, waiting to combine the work is often the right financial call.
The fourth question is when to get a second opinion. Get one whenever a quote exceeds about $2,000, whenever a repair call turns into a replacement recommendation, whenever the contractor will not put a diagnosis in writing, and whenever you are told the work does not need a permit.
Choosing electrical between the options
The judgement calls that decide the bill, before anyone quotes you.
- Hazard now, capacity soon, cosmetics later Sort every recommendation into those three. Only the first has a deadline.
- Require the load calculation before you accept a capacity argument 'Your panel is full' is a slot statement, not a capacity statement. They are different problems with different prices.
- Combine with renovation where possible Open walls are worth $1,000-$5,000 in avoided repair, per HomeGuide. Sequencing is free money.
- Get a second opinion above $2,000 Especially when a diagnostic call escalates into a replacement recommendation on the same visit.
- Check insurance before deciding, not after Carrier attitudes to knob-and-tube and certain panel brands can change the economics entirely.
All electrical decision guides
Do I Need a Electrical Upgrade?
When to Call an Electrician
Where these figures come from
Sources last checked
- This Old House - What Is the Cost to Upgrade an Electrical Panel? · retrieved 2026-07-25
- HomeGuide - Cost to Replace Knob and Tube Wiring (2026) · retrieved 2026-07-25
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