Rewiring an Older House and What It Costs Before Sale

I sold a 1948 weatherboard two streets from my own house where everything went well until the buyer's inspector pulled the cover off the panel. Knob and tube in two bedrooms, a 60 amp main, and three circuits spliced in a junction box with no cover on it. The buyer came back asking for 18,000 dollars off. The sellers had spent 9,000 on a new kitchen eight months earlier and had never once looked behind the switch plates.

Rewiring an older house is the least visible money you will ever spend on it, and the easiest to get wrong in both directions. Spend nothing and a buyer's inspector sets your price for you. Spend the full amount on a complete rewire and you will probably not get it back. The useful question is not whether the wiring is old. It is which parts of it will actually cost you at the negotiating table.

What is actually wrong in an old house

Age alone is not a defect. Plenty of 1960s wiring is in better condition than work done badly in 2010. What matters is which era of material is in the walls and what has been done to it since.

• Knob and tube, roughly pre 1950. Two separate conductors on ceramic insulators, no ground. It can be sound if undisturbed, but it fails where someone has buried it in blown-in insulation or tapped it for a new outlet. Several insurers will not write a policy on a house that has it, and that is what turns it from a quirk into a price problem.
• Cloth and rubber insulated cable, 1950s and 1960s. The insulation goes brittle and crumbles when it is moved, so the first electrician to touch a light fitting creates a bare conductor.
• Aluminium branch circuits, roughly 1965 to 1973. The metal expands and contracts at connections until the screw loosens, and loose connections are where fires start. This is the one inspectors flag hardest.
• Undersized or obsolete panels. A 60 amp service cannot run a modern kitchen plus an air conditioner. Certain brands of panel from the 1960s and 1970s have a documented history of breakers that do not trip, and an inspector will name the brand in the report.
• Missing grounds and no GFCI protection in kitchens, bathrooms, laundries and outdoors. Two prong outlets throughout the house are the visible symptom.

Go and look yourself before anyone else does. Open the panel door, count the circuits, pull one or two switch plates in the oldest part of the house, and check whether the outlets near the sink have test and reset buttons. Twenty minutes with a torch tells you which conversation you are about to have.

What a rewire costs in 2026

These are the ranges I see in quotes on ordinary suburban houses in the United States this year. Plaster walls, two storeys, or a finished basement push every line upward, because the labour is in getting at the cable rather than in the cable itself.

That last row is the one sellers forget. An electrician's quote covers wire and devices, not making your walls look like walls again. Ask directly whether patching is included, and if the answer is vague, assume it is not and add a painter's quote to your number. The same habit applies to every trade, which is why we wrote up how to compare renovation quotes before you sign anything.

Why rewiring before you list rarely pays for itself

The advice you will hear is to rewire before listing so the house presents as fully updated. I called auctions for twelve years and I have never once seen a bidder pay a premium for new wiring. Not once. What new wiring does is stop the deduction, and stopping a deduction is worth exactly the deduction, not more.

Work the arithmetic. A full rewire at 15,000 dollars removes an inspection issue that a buyer would typically price at 10,000 to 15,000 dollars, because buyers quote the worst number they were given. You break even at best, you have lived in a construction site for three weeks, and your contingency money is gone. Compare that with a new kitchen bench and paint, which is visible to every person who walks through on a Saturday.

There is one case where I change my mind completely. If the house cannot be insured in its current state, or a lender has baulked, the problem is no longer about price. It has become about whether a financed buyer can buy at all, and that cuts your market to cash buyers and investors. On a 1930s house with original knob and tube and a cloth covered service entry, rewire before you list. I have watched two of those sit unsold for five months each while the sellers refused to accept why.

For everything in between, work out the order of spending first. Our guide on how to prioritise renovations when the budget is tight sets out the sequence I would follow with 20,000 dollars and a house full of competing problems.

The partial fixes that remove the objection

Most of the fear in an inspection report comes from a handful of items, and most of those are cheap to clear. For about 4,000 to 7,000 dollars on a typical house you can usually deal with the panel, the kitchen and bathroom circuits, GFCI protection, interconnected smoke alarms and any visible junction box sins. What is left is old but documented wiring in bedrooms with light loads.

Then do the thing almost nobody does: have the electrician write a short letter on letterhead stating what was replaced, what remains, the date, and the permit number. I have handed that letter to buyers at open houses and watched the question die in their mouths. An inspection finding with a licensed explanation attached is an item on a list. The same finding with nothing attached is a reason to ask for 15,000 dollars.

Timeline, permits and living through it

A full rewire on a single storey house runs two to four weeks of electrical work plus one to two weeks of patching and painting. Expect power off for parts of several days, holes at every outlet and switch, and a rough inspection before the walls close up. Permits typically cost 150 to 600 dollars and the inspection is not optional; unpermitted electrical work found later is worse than old wiring, because it suggests what else was hidden. Our notes on renovation permit rules and how to check before work starts cover how to confirm what your jurisdiction wants.

Book it for a period when you can be out of the house, or at least plan on microwave meals and extension leads. Doing it while living there adds about a week because the crew works room by room around you.

Frequently asked questions

Does rewiring add value to a house?

It protects value rather than adding it. Buyers do not bid higher for new wiring, but they do deduct for old wiring, often by more than the actual repair cost. Treat the spend as removing a discount, not creating a gain.

How long does rewiring a house take?

Two to four weeks of electrical work on an average single storey house, longer on two storeys or over plaster. Add one to two weeks for patching and paint, which is usually a separate trade and a separate quote.

Can you rewire a house one room at a time?

Yes, and it is a sensible way to spread the cost if you are staying. New circuits run back to an upgraded panel as you go. It costs more in total because the electrician mobilises several times, usually 15 to 25 percent above a single job.

Should old wiring be disclosed when selling?

Yes, and get your own quotes first. A seller who hands over two written quotes controls the number under discussion. A seller who says nothing lets the buyer's inspector invent one, and that invented figure is always higher.