Your renewal keeps climbing. Almost nobody checks why.

A home insurance policy is the rare bill that renews itself without anyone looking at it. The document arrives, the number is a little higher than last year, and it gets paid. What almost never happens is anyone checking whether the house being insured still resembles the house on the policy.

That gap is where most of the money sits.

Your policy isn't priced on what the house is worth

The most common misunderstanding in this vertical is that a premium tracks market value. It doesn't. Insurers price against the estimated cost to rebuild the property — materials, labour, and what it would take to put the same structure back up. A house whose market value has doubled might have a rebuild cost that has barely moved. A modest extension can move it more than a hot local market ever will.

The four things insurers weigh most

• Roof age and condition

  One of the heaviest single factors. Roofs past roughly ten to fifteen years commonly attract a surcharge; newer ones attract a discount. If yours was replaced and nobody told the insurer, that's priced against you.

• Your claims file

  Prior claims sit in a shared industry database for seven years. Once old claims age out, the file an insurer reads is not the file they read last time you shopped.

• Security and protective devices

  Discounts usually attach to centrally monitored systems specifically. A local alarm with no monitoring contract often doesn't qualify — worth knowing before you assume you're getting the credit.

• Renovations and added space

  Finished basements, extensions and upgraded systems all change what it would cost to rebuild, which is the figure your coverage is set against. Under-insuring here is the expensive kind of mistake.

Two insurers can look at the same house and arrive at different prices — because each runs its own underwriting process and its own data sources.

That isn't a marketing line, it's how the market works. Which makes a single quote almost meaningless as a reference point. You cannot tell whether a number is fair without a second one beside it.

What to have ready

A quote form that asks nothing gives you a number that means nothing. Expect questions about where the home is, what it's built from and when, what protective devices are fitted, and your claims history. Those answers are precisely what makes one provider's price differ from another's — which is the reason the exercise is worth the few minutes it takes.

Rating factors per insurer guidance on how home insurance is calculated, including the point that different providers may quote different prices for similar homes. Source. Nothing on this page is an offer of insurance or a guarantee of any rate.