Rust in an electrical panel: how bad, and what it costs

Is rust in an electrical panel bad?

Yes. Rust means moisture has reached the panel. The International Association of Certified Home Inspectors (InterNACHI) calls it "a serious issue." That moisture "can disrupt power flow, cause heat buildup and lead to a fire, or cause electrocution." Before your inspection deadline, have a licensed electrician open the panel and put the fix in writing. Then ask the seller for that repair or a credit that covers it.

Key takeaways

• A 200-amp panel upgrade, permit included, comes to $1,350 to $3,300 on one national cost guide's figures.
• Breakers exposed to water are on the replace list in the electrical manufacturers' guide. Get the electrician's answer on yours in writing.
• A new panel does not fix the leak. Ask the electrician where the water gets in and to price that too.

Why does an electrical panel rust?

Only iron and steel rust. The panel's steel box, its screws and its connections rust when water reaches them. InterNACHI names three ways water gets in: worn or frayed cloth-covered service cables, the connector atop the electric meter, or the wall opening for the cable.

Your report may say "electrical box" instead of "panel." Ask your inspector which box the note means before you price it. Copper and aluminum wire can corrode, but InterNACHI says metals other than iron and steel "do not technically rust." So a rust note points at steel parts. If your report also flags aluminum wiring, treat that as its own finding.

What should I do if I see rust in my electrical panel?

Don't open it or clean it yourself. InterNACHI's advice is plain: "A rusty electrical panel should be inspected by a qualified electrician." Book a licensed electrician inside your inspection window. Ask them to check the parts InterNACHI lists: the steel panel parts, the screw connectors, the wire connections, and where the service cable meets the main breaker.

Ask about the breakers too. The National Electrical Manufacturers Association (NEMA) says water can affect a breaker's mechanism "through corrosion, through the presence of foreign particles, and through loss of lubrication." Its guide to water-damaged equipment lists molded case circuit breakers exposed to water for replacement, while the panelboard itself "may be reconditioned" after the manufacturer is consulted. Ask the electrician, in writing, which applies to yours.

How to get repair estimates during the inspection period covers booking that visit fast. If your report also names a Federal Pacific panel, one visit can cover both.

How much does it cost to replace a corroded electrical panel?

The electrician decides whether the panel can be repaired or has to come out. If it comes out, these are published figures for a 200-amp panel:

Here is the math on This Old House's figures. The upgrade runs $1,300 to $3,000. Add a $50 to $300 permit, and the job comes to $1,350 to $3,300. Fixing where the water gets in, such as the service cable or the meter connection, sits on top. Only the electrician's bid prices that part.

HomeAdvisor says most panel work needs a permit. If the seller does the work, ask for the permit and the electrician's invoice before closing.

What do I ask the seller for?

Ask for the fix the electrician wrote down, not a round number. Name the scope, the trade and the bid: repair or replace the rusted panel and correct the moisture entry, by a licensed electrician, with a permit, at the amount on their written bid.

You can ask for the repair before closing or a credit for the bid amount. If you ask for the repair, leave room for scheduling. HomeAdvisor puts an average upgrade at about 4 to 8 hours of work. Toth Electric, in Northern New Jersey, says it has to coordinate a shutoff and reconnection with the power company. What to ask for after a home inspection covers how this line fits your list, and the buyer repair request letter template gives you the wording. Your contract sets the deadline for the request, so confirm the date with your agent.

What if the seller says no?

You still have choices:

• Take a credit for the bid amount and hire your own electrician after closing.
• Ask for a lower price by the same amount.
• Talk through your options with your agent if the number, or the unknowns, are too much.

When to walk away after a home inspection sets out the two questions that decide it: what it costs, and whether anyone can tell you yet.

What is the average lifespan of a home electrical panel?

InterNACHI's life expectancy chart lists 60 years for a service panel. It calls the chart "a general guideline," since life varies with use, weather, installation, maintenance and materials. For a rusted panel, go by the electrician's report on its condition, not its age.

How do I know what the rest of my report is worth?

Put a number on every line, not just the panel. The electrician's bid covers the panel, but your report has other lines. Kept prices every line of an inspection report for $79, usually under 4 hours, and marks the ones that need a professional's quote. Add those figures to the electrician's bid and you have one total to send the seller.

If the panel is one finding among many and your window closes in days, upload your inspection report to Kept and send the seller one priced list.

Sources

• InterNACHI, Rust Inspection and Prevention
• InterNACHI, Standard Estimated Life Expectancy Chart for Homes
• NEMA, Evaluating Water-Damaged Electrical Equipment
• This Old House, Cost to Upgrade an Electrical Panel
• HomeAdvisor, Cost to Upgrade or Replace an Electrical Panel
• Toth Electric, Electrical Panel Replacement Cost in Northern New Jersey