Shopping insurance usually means comparing prices at renewal. The larger differences in outcome come from whether the cover still matches what is being insured.
Circumstances drift away from the policy
Policies are written against a snapshot: a house of a certain size, a household of a certain shape, a car driven a certain distance each year.
Renovations, a new home business, a teenage driver or a move all change the risk without changing anything in the contract.
Nothing in the renewal process asks whether any of those things have happened.
The policy continues to price and cover what was described at inception until somebody actively updates it.
Underinsurance is invisible until a claim
An amount that was adequate five years ago can sit well below current rebuilding costs after several years of construction inflation.
Automatic inflation adjustments help, but they are index-based and know nothing about an extension or a finished basement.
The shortfall surfaces at the one moment when it can no longer be corrected.
Contents are more often understated than the dwelling, because possessions accumulate gradually and nobody revalues them.
Price shopping tends to buy less cover
A materially cheaper quote is usually cheaper for a reason, whether a higher deductible, a narrower form or a change in settlement basis.
Where the saving comes from a genuine rating difference, it survives comparison at identical terms and limits.
Where it does not, quoting like for like exposes it immediately, which is the entire point of doing so.
Liability limits age worse than property limits
Property amounts get reviewed because they are visible on the declarations page and adjusted by inflation provisions each year.
Liability limits are usually chosen once and left alone, even as household assets and income grow past the point they were set for.
The cost of raising them is small relative to other coverage, because very large claims are rare.
An umbrella policy sitting above them is often cheaper than an equivalent increase applied to each underlying policy separately.
A review costs nothing and produces a record
Annual reviews with an agent generally cost nothing and produce an updated record of what has been disclosed to the insurer.
Disclosure matters at claim time, because a material change the insurer never knew about can affect how a claim is handled.
The review is what converts a policy from a document filed at purchase into one that describes the current situation.
Price comparison still belongs in that conversation, but it works better once both sides know what is being priced.