Two policies covering the same house can pay very different amounts for the same loss. The difference is usually how the policy values what was destroyed.
Actual cash value subtracts wear
Actual cash value pays what the property was worth at the moment of loss, which means the cost to replace it reduced by depreciation for age and condition.
A roof most of the way through its expected life is worth considerably less than a new one, and this basis pays accordingly.
The logic is indemnity: the policyholder is restored to their position before the loss, which was ownership of a used roof rather than a new one.
Replacement cost pays for new
Replacement cost pays what it takes to replace the item with a comparable new one, without a deduction for how old the original was.
This leaves the policyholder better off than immediately before the loss in a narrow sense, which is why the coverage costs more.
It also reflects what most homeowners actually need, since a damaged roof cannot be replaced with a partially worn one at a discount.
Payment often arrives in two stages
Replacement cost policies commonly pay the depreciated amount first and release the remainder only after the repair is completed and documented.
This protects the insurer against paying for a new item that is never bought, but it means the policyholder must fund the gap temporarily.
Households that are unaware of the sequence can find a claim settlement smaller than expected at the moment they most need the funds.
Contents and structure may differ
A policy can use replacement cost for the building and actual cash value for personal property, or apply different bases to specific categories.
Older belongings depreciate substantially, so a contents claim settled on an actual cash value basis pays far less than the cost of restocking a household.
The declarations page names the basis for each coverage, which is the fastest way to know how a policy would actually respond.
Neither basis guarantees full recovery
Both methods sit inside limits, and if the insured amount is below the true cost of rebuilding, the shortfall is the policyholder's regardless of basis.
Construction costs move over time, so a limit that was adequate when set can drift out of line without anyone noticing.
Some policies include provisions that adjust limits or add a margin above them, and whether one applies depends on the specific contract in force.