Almost everything in this module starts as a home-insurance problem before it becomes a mortgage problem. Most lenders require confirmation that a property is insured, on ordinary terms, before funding a mortgage against it — so a feature that makes a property difficult or expensive to insure becomes, indirectly, a condition of financing too. Asking whether a property can be insured on standard terms is one of the most useful early questions a broker can raise on any older or unusually-constructed home.
Knob-and-tube wiring — an early style of electrical wiring found in many homes built before the mid-20th century — and aluminum branch wiring, more common in homes built in the 1960s and 70s, are two of the most common reasons an older property runs into insurance resistance. Neither is automatically unsafe when properly maintained, but many insurers decline to cover a property with either system present without evidence of an inspection, and often an upgrade, by a licensed electrician.
Where wiring is a known issue, the useful path is the same one that runs through this whole course: get it documented rather than glossed over. A licensed electrician's assessment, and where necessary a completed upgrade with permits closed off, is what actually satisfies an insurer and, by extension, a lender — not a seller's assurance that "it's never been a problem."
A property heated by oil, or one that used to be, may have a fuel oil tank on the property — above ground in a basement or utility area, or buried outside. Insurers commonly ask about tank age, material and location because a leaking tank, particularly an old buried one, can cause significant, expensive environmental contamination that the insurer would otherwise be on the hook for. Many insurers will decline or restrict coverage for older tanks, or for buried tanks generally, without documented evidence of the tank's condition or its removal and replacement with a different heat source.
For a buried tank in particular, confirming whether it has already been properly decommissioned and removed — with documentation — is worth doing before an offer, since discovering an old buried tank after closing can turn into a genuinely expensive environmental remediation problem for the new owner, separate from any financing question.
A property relying entirely on a wood stove, pellet stove, or similar solid-fuel appliance as its only heat source — rather than as a supplement to a conventional furnace — can also draw insurer scrutiny, since these systems carry a different fire-risk profile and typically need to meet specific installation and certification standards to be accepted. As with wiring and oil tanks, the practical path is documentation: proof of proper installation and, where relevant, a recent inspection, rather than assuming the existing setup will pass without question.
Log homes, post-and-beam and timber-frame construction, earth-sheltered homes and other unconventional building methods can also raise both appraisal and insurance questions, generally for the same underlying reasons as everything else in this module: fewer comparable sales to value against, and a smaller pool of insurers and lenders with experience underwriting the specific construction type. None of this makes such a property unfinanceable — it simply means the search for the right lender and insurer needs to start earlier, and with more specific questions, than it would on a conventional build.
A century home has original knob-and-tube wiring throughout, and the seller says it has "never caused a problem." How should a broker treat this going into an offer?
Knob-and-tube wiring is a common trigger for insurer resistance, and since most lenders require standard insurance as a condition of funding, this flows through into a financing condition as well — checking early, before the offer is firm, preserves the buyer's options. A seller's informal assurance is not documentation an insurer or lender will rely on; and while some insurers do decline outright, others will accept it with an electrician's assessment or an upgrade, so treating it as an automatic dealbreaker overstates the problem in the other direction.
Lender policies change without notice. Confirm current guidelines directly with the lender or insurer before relying on them for a live file.
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