Home Insurance for Older Homes: What Raises Premiums

Short answer: Older homes generally cost more to insure, and state regulators name the reasons: the age and condition of the wiring and roof, the type of construction, the cost to rebuild and the claims history (Connecticut Insurance Department; NAIC). Updating electrical, plumbing, heating and roof systems is one of the few levers that can earn a discount.

Check a specific house: See which materials an insurer is likely to ask about for a home of a given year. Open the House Age Decoder with 1950 loaded →

Why age matters to an insurer

An insurer prices a home on two questions: how likely is a claim, and how much would it cost to repair or rebuild? Age affects both. The NAIC’s consumer guide says premiums are often higher for older homes and for homes in poor condition (NAIC), and the Connecticut Insurance Department states plainly that older homes generally cost more to insure (source).

This guide gives factors, not prices. Premiums depend on the insurer, the state, the location and the coverage you choose, and any figure we printed would be out of date or wrong for your situation.

The factors regulators list

Factor	Why it matters	Source
Age and condition of the home	Older homes and homes in poor condition often cost more	NAIC; Connecticut
Condition and age of wiring	Old or modified wiring raises fire risk	Connecticut
Roof age, type and condition	Roofs drive weather and water claims	Connecticut; Idaho
Construction type	Brick or masonry is usually cheaper to insure than wood frame	NAIC
Cost to rebuild	Not the same as purchase price; older details can be expensive to replace	NAIC; Idaho
Claims history	Claims on the home, by you and in the area, affect the premium	NAIC; Idaho
Location	Fire station distance, weather exposure, crime	Connecticut; Idaho
Wood stove	Listed as a premium factor	NAIC
Deductible	Higher deductible, lower premium	NAIC; Connecticut; Idaho
Credit history	Used where state law allows	NAIC; Connecticut

Sources: NAIC consumer guide, Connecticut Insurance Department, Idaho Department of Insurance.

The old-house red flags insurers ask about

Some materials common in older homes come up again and again in underwriting questions. Each has a dedicated guide:

Knob-and-tube wiring (about 1880 to the 1940s). Many insurers refuse to cover homes that still have it unless an electrician certifies it as safe (InterNACHI).
Aluminum branch-circuit wiring (1965 to the mid-1970s), which CPSC links to overheating at connections (CPSC).
Polybutylene supply pipe (1978 to the mid-1990s), which can raise premiums or lead to a denial (InterNACHI).
Old roofs, whose age and condition regulators list as a premium factor.
Wood stoves, listed by the NAIC as a factor.

What can lower the premium

State and national regulators point to a handful of levers:

Updating major systems. The NAIC says updating electrical or plumbing systems and replacing the roof can qualify for discounts, and Idaho’s insurance department mentions upgrades to air conditioning, heating or plumbing (NAIC; Idaho).
Protective devices. Burglar alarms, smoke detectors, sprinkler systems, deadbolts and, in Idaho’s list, automatic water shut-off valves.
A higher deductible, if you can afford it.
Bundling home and auto with one insurer, and staying with an insurer, which the NAIC lists as factors.
Keeping proof. Permits and invoices for rewiring, repiping, roof and heating work give the insurer something concrete.

Claims history: CLUE

The NAIC explains that most insurers report homeowners claims to private nationwide databases such as CLUE, and that how often you file and the types of claims affect your premium (NAIC). When you buy, the home’s own claims history can matter too, so ask about past claims, especially water damage.

Questions to ask

The insurer, before you make an offer

Will you write a policy on a home built in [year] with [wiring / pipe / roof details]?
What information or inspections do you require for an older home?
Which upgrades would change the premium, and by roughly how much in percentage terms?
Is the policy replacement cost or actual cash value, and how would older finishes be valued?

The seller

When were the roof, wiring, plumbing and heating last updated? Are there permits?
Have there been any insurance claims on the house?
Has any insurer declined to cover it?

The home inspector

What would an insurer’s underwriter flag in this house?
How old do the roof, panel and water heater appear to be?

What to do

Get insurance quotes during your inspection period, not after.
Use the House Age Decoder to list the materials an insurer is likely to ask about for that year.
Prioritize upgrades insurers recognize: wiring, plumbing, heating and roof.
Keep every permit and invoice in one folder.
Shop several insurers. Each sets its own rules and rates, which most file with the state.

This guide is general information, not insurance advice. Talk to a licensed agent or your state insurance department about your situation.

Replacement cost vs. actual cash value

The NAIC guide explains the two main ways a policy values a loss (NAIC). Replacement cost pays to repair or rebuild with materials of like kind and quality. Actual cash value takes depreciation into account, so it pays less for older items. In an older house with original millwork, plaster or other details that are expensive to reproduce, ask how the policy would value them and whether the coverage limit reflects the real cost to rebuild, which the NAIC notes is different from the purchase price because purchase price includes land.

Documents to gather before you shop

Year built, square footage and construction type (frame, brick, masonry).
Roof: material and the year it was replaced, with an invoice if possible.
Electrical: panel type and any rewiring, with permits.
Plumbing: supply pipe material and any repiping, with permits.
Heating: system type and age; note any wood stove.
Protective devices: alarms, smoke detectors, sprinklers, water shut-off.
The home inspection report, especially items about wiring, plumbing and roof.

Having this ready makes quotes more accurate and helps you compare insurers on the same facts.

Common misunderstandings

“Insurance is priced on what I paid.” The NAIC points out that the cost to rebuild differs from the purchase price.
“All insurers treat old wiring the same.” Each insurer sets its own underwriting rules, which is why shopping several matters.
“Small claims don’t count.” Claims are reported to shared databases and can affect future premiums, as the NAIC explains.
“Upgrades only matter for resale.” Regulators list system upgrades among things that can earn discounts.

When an insurer says no

A declined application is not the end of the road. Ask the insurer which specific item caused the decision, such as wiring, plumbing, roof age or claims history. That tells you whether a repair, documentation from a licensed contractor or a different insurer is the faster fix. Each company sets its own underwriting rules, so a home one insurer declines may be acceptable to another. If you cannot find coverage in the regular market, your state insurance department can explain the options available where you live, and a licensed independent agent can compare several companies for you.