The house is a 1926 four square with a slate roof, good bones, and a kitchen that has not been touched since the Ford administration. Purchase 118,000 dollars, rehab budget seventy-two thousand, after repair value around 249,000 dollars. Your electrician walks it with you and delivers the sentence that changes the deal: the service is a sixty amp fuse panel, there is knob and tube running through the second floor and the attic, and about a third of the branch circuits are original. He can do a full rewire and a two hundred amp service for roughly twenty-two thousand dollars, or he can pull a permit for a partial and you will be back here in five years.
Old electrical on a deal you are underwriting? Send us the address, the electrician’s scope, and your budget. We will tell you how a lender is likely to treat it, whether it becomes a draw condition, and what it does to your leverage. No cost, no obligation.
Send it here or call 412-990-2941. FMC Capital, NMLS #1840537.
We finance rehabs and rentals for investors throughout Pennsylvania and additional states, and outdated electrical is the single most consequential line item in older housing stock that investors routinely underbudget. It is not glamorous. Nobody sells a flip on the panel. But it is the item most likely to cause an insurance decline, a draw hold, an appraisal condition, and a resale problem, sometimes all four on the same house.
This guide covers the three systems lenders and carriers actually care about, why insurance is the real gate, how it hits your draw schedule, and how to budget it so the deal survives.
The three systems that get flagged
Knob and tube. The original residential wiring method, common in houses built roughly from the 1880s through the 1940s. Individual conductors run through porcelain knobs and tubes, with no grounding conductor and rubberized cloth insulation that becomes brittle with age. Properly installed and undisturbed, it can be safe. The problem is that almost none of it is undisturbed after eighty years, and the two failure modes are specific: insulation degradation from heat and age, and the near universal practice of burying it in blown-in attic insulation, which was never contemplated in its design and traps heat against the conductors.
Fuse panels. A service panel using screw-in or cartridge fuses instead of circuit breakers. The fuses themselves are not inherently dangerous. Two things are. First, service capacity: many are sixty amps, which is not enough for a modern rental with an electric range, a dryer, and window units. Second, over-fusing, in which somebody put a thirty amp fuse in a slot protecting fifteen amp wiring, which defeats the protection entirely and is extremely common.
Aluminum branch wiring. Used widely in residential branch circuits during roughly the mid 1960s to mid 1970s, when copper prices spiked. The metal expands and contracts more than copper and oxidizes differently, and the result is loosening connections at outlets and switches that can overheat. Note the distinction that gets missed constantly: aluminum service entrance cable and aluminum feeders to a subpanel are ordinary and fine. It is aluminum on the small branch circuits that draws attention.
There is also a fourth category worth knowing: certain electrical panel brands manufactured mid-century have long-standing reputations for breakers that fail to trip. Home inspectors flag them by name and many carriers decline over them. Your inspector or electrician will tell you if the panel in front of you is one of them.
Insurance is the real gate, not the lender
Investors assume the lender is the obstacle. It usually is not, at least not directly. What happens is that the carrier declines or surcharges, and the lender cannot close without acceptable insurance, so a carrier decision becomes a lender decision.
Carrier practice is not uniform, but the pattern is consistent. Many carriers will not write a dwelling policy on a property with active knob and tube. Some will write it with an electrical inspection certifying the system, or with a surcharge, or with an exclusion for electrical fire, which is the coverage you actually needed. A sixty amp service is a decline for a meaningful share of carriers regardless of the wiring behind it. Aluminum branch wiring is frequently insurable if the connections have been remediated by a licensed electrician using an approved method and there is documentation.
This is the same dynamic that plays out on old roofs, where a carrier decision reprices a finished file at the last minute, and if you have not seen that pattern before it is worth reading our guide to how an insurance decline reprices a finished rental file. The electrical version arrives the same way and at the same point in the calendar.
Two practical rules follow. Get a real quote, not a ballpark, before your inspection contingency expires. And if the property is going to be vacant during a rehab, understand that the policy you need is not a landlord policy at all, which we cover in our guide to builder’s risk and vacant property insurance.
How it hits a rehab loan
A fix and flip lender funds against a scope and a budget, and electrical shows up in three places.
The scope has to be honest. If the appraiser’s after repair value assumes a renovated house and your budget shows four thousand dollars for electrical, an experienced underwriter reading a 1926 four square is going to ask what that four thousand dollars covers. A scope that understates a known system replacement is the fastest way to get a budget kicked back, and the standards underwriters apply are described in our guide to what the lender checks on contractor bids.
The permit becomes a draw condition. Electrical work is permitted work in essentially every jurisdiction, and rough-in and final inspections are required. Most rehab lenders will not release a draw covering electrical without evidence of the permit, and some want the inspection sign-off. This is exactly the situation our guide to when the lender requires a permit before funding a draw describes, and electrical is the most common trigger for it.
The sequencing eats your schedule. A rewire is not a standalone task. It is opening walls and ceilings, which has to happen before insulation, drywall, and finishes. If the electrical scope grows mid-project, everything behind it moves, and a schedule change on a short-term loan is a cost. If the scope grows enough to need a formal amendment, you are in the process covered in our guide to adding scope and budget mid-rehab.
And if the discovery is bad enough that the whole budget stops working, the honest response is a repricing conversation, not a hope that it evens out. The arithmetic of that decision is the same one laid out in our guide to when the appraisal comes in below your ARV: adding your own cash to preserve a deal whose economics changed is how investors turn a mediocre project into a bad one.
What it does to a rental loan
On a rental purchase where you are not renovating, the electrical question resolves along two paths.
The first is the appraisal. If the appraiser notes the electrical system as inadequate or as a condition affecting safety, the report is likely to come back subject to repair, which puts you in the repair escrow process covered in our guide to when the appraisal comes in subject to repairs. Expect a holdback exceeding the bid and a deadline for completion.
The second is insurance, and it is the one that actually stops closings. No binder, no funding.
The ratio impact is worth modeling because it is bigger than people assume. Take a duplex at 165,000 dollars with rents of 950 dollars and 925 dollars. Twenty-five percent down gives a loan of 123,750 dollars, and at seven and three eighths percent over thirty years principal and interest is about 855 dollars. Taxes 235 dollars. Standard landlord insurance would be 105 dollars a month.
Payment side 1,195 dollars. Gross rent 1,875 dollars. Ratio: 1.57.
Now the carrier surcharges for knob and tube and the premium goes to 195 dollars a month. Payment side 1,285 dollars. Ratio: 1.46.
Eleven hundredths of coverage, gone, permanently, for as long as you own the property. On this file it does not matter. On a file that started at 1.12 it would land at 1.04, and it would change the pricing tier or the product.
The more useful way to think about it: at 90 dollars a month of surcharge, you are paying 1,080 dollars a year forever to avoid a rewire. A twenty-two thousand dollar rewire pays for itself against the surcharge alone in about twenty years, which sounds bad until you add the resale effect, the reduced fire risk, and the fact that the surcharge is not the only cost. Model both versions on our DSCR deal calculator before you decide.
Budgeting it properly
Costs vary enormously by market, house size, access, and whether plaster or drywall is coming off. What follows is a way to think, not a price list. Get local bids.
Panel and service upgrade only. Replacing a fuse panel with a two hundred amp breaker panel, including the service entrance and meter base, is the smallest version of this job. It solves capacity and over-fusing. It does not touch the branch wiring behind it, which means it does not solve knob and tube.
Partial rewire. Replacing the accessible original circuits, typically attic, basement, and anything behind walls that are already open, while leaving buried runs in place. Cheaper, and appropriate on some houses. Understand what you are buying: many carriers ask whether there is any active knob and tube, not how much, so a partial may not solve the insurance problem at all. Ask the carrier the question before you choose the partial.
Full rewire. Every branch circuit replaced, new panel, grounding throughout, code-required receptacle and lighting layout, arc fault and ground fault protection where required. This is the version that ends the conversation permanently and it is the one to price on a house you are renovating anyway, because the walls are open regardless.
Three budgeting rules from files that went wrong.
One, get the electrical bid before you remove the inspection contingency, not after. It is the single bid most likely to blow up a budget and it is available in a few days.
Two, carry a contingency specifically on electrical. Opening walls in a house that has been modified four times over a century reveals things. A ten to fifteen percent contingency on the electrical line item alone is reasonable.
Three, confirm what the municipality requires on a partial. Some jurisdictions will require a full-house code compliance upgrade once you pull a permit for significant electrical work, which converts your partial into a full rewire by operation of the code. Ask the code office before you scope. That is the same municipal dependency that shows up in our guide to rental registration and occupancy inspections.
The resale and refinance angle
If your exit is a sale to a retail buyer, that buyer needs financing and insurance too. A conventional or government-backed loan on a house with a sixty amp fuse panel and active knob and tube will very likely come back subject to repair, and the buyer’s carrier may decline outright. You will discover this after you have a signed agreement and a listing that has been on market for weeks, and you will end up doing the rewire anyway, on a deadline, at a worse price, with a buyer who now knows you have to.
If your exit is a refinance into long-term rental financing, the same appraisal and insurance gates apply, just to you instead of a buyer. The transition itself is covered in our guide to refinancing a fix and flip into a rental loan, and an unresolved electrical condition is one of the more common reasons that refinance does not land where the investor expected.
Either way, the deferred cost comes due at the worst moment. It is nearly always cheaper to do it while the walls are open and the timeline is yours.
The bottom line
Old electrical rarely kills a deal by itself. What it does is convert a straightforward file into one with an insurance dependency, a permit dependency, and an appraisal dependency, all of which land in the same two weeks if you find them late.
The sequence that works is short. Get an electrician in the house during the inspection period. Get a real insurance quote on the actual system, not a generic quote on the address. Confirm with the code office what a permit will trigger. Then decide between panel, partial, and full rewire with the carrier’s answer in hand rather than after the fact.
Do those three things and outdated electrical is a line item. Skip them and it is the reason your loan does not fund.
Underwriting an older house with questionable electrical? Send the address, the inspection report, and your rehab budget through our contact page or call 412-990-2941 and we will tell you how a lender will read it before you commit. You can see how our rental financing works on the DSCR rental loan page, and if the insurance surcharge is going to squeeze the file, run it both ways on our DSCR deal calculator. Where the cash for a larger electrical scope is coming from matters too, and our guide to acceptable sources of cash to close covers the documentation side of that.
FMC Capital is a Pittsburgh-based licensed mortgage brokerage, NMLS #1840537. This article is for educational purposes only and is not a commitment to lend, an offer of credit, legal advice, or electrical or insurance advice. Electrical code requirements, permit and inspection rules, carrier underwriting practice, remediation standards, costs, and lender guidelines vary by jurisdiction, property, insurer, contractor, lender, and borrower at the time of application, and are subject to change. Use a licensed electrician and confirm requirements with your local code official and insurance agent.