Your home inspection report came back with knob and tube wiring. Or your insurance carrier declined the policy. Now the conventional sale is stalling, and you’re trying to figure out why a 90-year-old house that has never had a fire is suddenly unsellable.
The short version: You can sell a house with knob and tube wiring. The real obstacle is that most insurance companies won’t write a new policy on it — and without homeowners coverage, no mortgage lender will fund the loan. Cash buyers skip that requirement entirely. If you have 6–8 weeks and $8,000–$20,000 to spend upfront, rewiring and listing with an agent typically nets more. If you don’t, a cash offer as-is is the real option. Call (615) 780-7349 for a number within 24 hours.
The insurance problem, not the wiring problem
Knob and tube wiring dates to roughly 1880–1940. It has been in millions of American homes for a century. The wiring itself doesn’t spontaneously fail — decades of K&T-wired houses have been lived in without incident. The problem is that insurers have decided it represents too much exposure to write new policies on.
And without a homeowners insurance policy in place at closing, no mortgage lender will fund the loan.
The chain is: no policy → no lender commitment letter → no closing.
Carriers that commonly decline or heavily restrict new K&T policies:
- State Farm — requires an electrical inspection certificate and may still decline on active K&T
- Allstate — commonly declines without full replacement
- Nationwide — similar underwriting restrictions on pre-war wiring
- Florida Citizens Insurance — explicitly excludes homes with knob and tube wiring built before 1940; this is policy language, not individual underwriter discretion
Some specialty carriers will write K&T policies, but at surcharges of $1,500–$3,000 per year above comparable homes. Buyers who get a quote after going under contract often walk.
The buyer doesn’t always discover this before making an offer. When they shop for insurance after the purchase agreement is signed and find out the coverage doesn’t exist at a reasonable price, that is when deals fall apart.
What FHA and VA lenders actually require
FHA loans (governed by HUD 4000.1) and VA loans (VA Pamphlet 26-7 Ch.12) require appraisers to flag deficiencies that affect health and safety. Knob and tube wiring is a gray area: the 4000.1 does not fail K&T by name, but it requires appraisers to flag any electrical system that is “not functioning properly” or creates a safety hazard.
In practice:
- Many FHA appraisers flag active K&T as a matter of professional habit, even when the wiring is operational
- A repair condition from the appraiser means the seller must fix it before closing or lose the financed buyer
- Even without an appraisal flag, the insurance barrier blocks FHA and VA loans the same way it blocks any other financed purchase — the lender requires hazard insurance at closing
Conventional Fannie Mae and Freddie Mac loans carry the same insurance requirement. The path to the insurance problem is the same regardless of loan type.
For a broader look at how electrical issues affect sales, see our guide to selling a house with electrical problems. The aluminum-wiring version of this problem — single-strand aluminum branch circuits from 1965–1973 — is covered separately at sell house with aluminum wiring.
What rewiring actually costs — and the math that determines your path
Full rewiring means replacing every branch circuit in the house. It is not patching or adding outlets — the knobs and tubes come out entirely and new sheathed cable runs through the walls.
Cost ranges by house size:
- 1,200 sq ft: $8,000–$14,000
- 1,800 sq ft: $12,000–$20,000
- 2,500+ sq ft with plaster walls and finished attic: $18,000–$36,000+
Pre-war homes built during the K&T era typically have plaster walls, not drywall. Electricians have to open plaster to run new circuits, then a separate plasterer restores them. That drives the high end of those ranges. Permits and final inspection add 2–4 weeks on top of the physical work. Budget 6–8 weeks from first contractor to a clean result.
The math on a $280,000 home (example):
| Path | Estimated net |
|---|---|
| Rewire ($15k) + list with agent (6% commission) + closing costs ($8k) | ~$241,000 |
| Cash offer as-is (10–15% discount factored in) | ~$220,000–$238,000 |
The gap is real — typically $5,000–$20,000 depending on the rewiring cost and the depth of the discount. On a home where the rewiring runs $8,000 and the discount is moderate, rewiring and listing wins clearly. On a home where the rewiring costs $20,000 and requires 6 weeks you don’t have, the numbers close fast.
The question that decides it: what does the rewiring cost in your specific house, and do you have the time and capital to do it before you need to close?
When you should not sell to us
If your house is in otherwise good shape and you have 6–8 weeks and the money to pay for rewiring upfront, listing with a traditional agent after the electrical work is done will likely net you more. The gap in the table above is real, and walking away from it doesn’t make sense if you have both the time and the money.
Also worth checking: some pre-war homes have had K&T updated in phases. If only the attic or basement still has inactive K&T — not carrying live loads — some insurance carriers will write a policy after a licensed electrician certifies it as safe and dormant. That certification costs $150–$300. If it works, you can list with an agent and reach the full market.
We’re not the right buyer for a house that can be insured and sold conventionally. A seller in that position is leaving money on the table by calling us instead of a real estate agent. We’d rather you know that.
If condition issues beyond the wiring are also a factor, selling a house as-is covers the broader picture of what cash buyers price for and why.
State specifics
Tennessee
Nashville’s pre-war stock — Sylvan Park bungalows, Germantown row houses, Waverly-Belmont Craftsman homes, Eastwood and Greenwood in East Nashville — represents the highest concentration of K&T wiring in the state. The city’s housing demand has made these homes valuable, but the insurance gap is catching sellers when they list conventionally.
TCA § 66-5-202 requires disclosure of known material defects before closing. Once you know your house has K&T wiring — including from an inspection report you received — you are required to disclose it. The statute of limitations for nondisclosure claims runs 3 years from discovery by the buyer.
Metro Nashville Codes (Davidson County) does not prohibit living in a K&T home, but any renovation permit that involves electrical work requires bringing those circuits up to code. A kitchen remodel or bathroom addition can trigger full circuit replacement in that portion of the house — which surprises owners mid-project.
Florida
Florida Citizens Insurance — the state’s insurer of last resort — explicitly excludes homes with knob and tube wiring built before 1940. That covers most of the K&T inventory in Ybor City (Tampa), near-downtown Fort Lauderdale, and Seminole Heights. Private carriers already restrict K&T in Florida; the Citizens exclusion means there is sometimes no insurable path without rewiring.
FL § 689.261 requires disclosure of known material facts affecting property value. Known K&T wiring is a material fact.
The post-Surfside enforcement environment (SB 154, 2022) has pushed Florida buyers and lenders toward stricter property condition reviews. Cash buyers are not subject to those review requirements. Florida buyers — particularly in Tampa — looking at older housing stock also run into this wiring issue alongside hurricane risk; see our Tampa seller guide for the broader context.
Texas
TREC Form OP-H, Section 10 (Electrical Systems), requires sellers to disclose known defects in the electrical system. Knob and tube wiring is a disclosed item under that form. Buyers have 7 days under standard TREC contracts to terminate after the inspection period begins.
The Texas K&T inventory is concentrated in Oak Cliff and the M Streets in Dallas, Montrose and the Heights in Houston, Hyde Park in Austin, and the Monte Vista Historic District in San Antonio. Unincorporated county homes on acreage — in Kaufman, Parker, and Johnson counties outside the Dallas metro — sometimes have K&T that was never updated because no permit was ever pulled.
State Farm, Allstate, and USAA all require full K&T replacement as a condition of new policy issuance in Texas. The Texas Windstorm Insurance Association (TWIA) covers only coastal wind damage and does not substitute for a homeowners policy. The mortgage insurance requirement still applies regardless.
Here’s what happens after you submit the address
Submit the address and we confirm receipt the same day.
- Cash offer within 24 hours — no inspection contingency, no appraisal, no insurance requirement
- You pick the closing date — 7 to 14 days if that works, or longer if you need time
- No commission, no closing costs on your side
- We’ve bought more than 100 houses as-is
The offer accounts for the wiring and the condition. You’ll know the number and the reasoning behind it. There’s no obligation to accept. If you want to talk through it first, call (615) 780-7349.
Straight answers
Can I sell a house with knob and tube wiring to a conventional buyer?
Yes, but most lenders require homeowners insurance at closing, and most insurance carriers won’t write a new policy on active K&T. Unless the buyer is paying cash, the insurance gap usually prevents the loan from funding.
Does knob and tube wiring automatically fail an FHA inspection?
Not automatically. HUD 4000.1 requires appraisers to flag electrical deficiencies, but K&T doesn’t fail by name. In practice, many FHA appraisers flag active K&T as a safety concern, which triggers a repair condition. Even without an appraisal flag, the insurance barrier blocks FHA loans the same as any other financed purchase.
Do I have to disclose knob and tube wiring?
Yes. TCA § 66-5-202 (Tennessee), TREC Form OP-H Section 10 (Texas), and FL § 689.261 (Florida) all require disclosure of known material defects. Once an inspection report identifies K&T, you know it — disclose it.
How long does a full rewire take?
Five to ten working days for the electrical work, then 2–4 weeks for permits and inspection. Plaster repair in pre-war homes adds more time. Plan on 6–8 weeks from contractor start to a clean final result.
What does a cash buyer pay for a K&T house?
Typically 10–15% below what the same house would trade for fully rewired, with the estimated rewiring cost factored into the offer. On a $280,000 home that often lands $220,000–$238,000, depending on the house and what else is in play. Submit the address and you’ll have our actual number within 24 hours.
What is the difference between knob and tube wiring and aluminum wiring?
Knob and tube is pre-war wiring — roughly 1880–1940 — using separate unsheathed copper conductors run through ceramic insulators. Aluminum wiring refers to single-strand aluminum branch circuits installed during a copper shortage from approximately 1965–1973. Both create insurance and financing problems, but through different mechanisms and in different house vintages. See our aluminum wiring guide if that’s what your inspection flagged.