The one-word difference: depreciation
The entire difference is one word: depreciation. The National Association of Insurance Commissioners (NAIC) defines replacement cost value as paying “the cost to repair or replace your damaged property without deducting for depreciation.” Actual cash value, the NAIC states flatly, pays “the depreciated cost to repair or replace your damaged property,” and it “often does not pay enough to fully replace your property.”
Depreciation reflects age and wear, not what you originally paid. The Insurance Information Institute gives the textbook case: if a tree wrecks your 15-year-old roof so badly that it has to be completely replaced, a replacement cost policy would pay the full cost of installing a new roof, while an actual cash value policy would pay a smaller percentage of the cost of replacing it.
The NAIC roof example
The NAIC's own roof example runs the same direction with different inputs: on $15,000 of roof damage with a $1,000 deductible, the replacement-cost household nets $14,000, while the actual-cash-value household nets just $4,000 after $10,000 of depreciation and the deductible. Same roof, same storm, same deductible — a $10,000 difference, decided entirely by the settlement basis written into the policy.
That is why the settlement basis matters more than the deductible for an older home. A low deductible does not help if depreciation has already taken most of the claim.
How a replacement-cost claim is paid
A replacement-cost claim is usually paid in two instalments, not one. The insurer first pays the actual cash value — replacement cost minus depreciation — less your deductible. The depreciation it held back is recoverable: it is released when you prove the work was actually replaced, by submitting the final invoice. The two-check structure is how the insurer makes sure the settlement builds a roof instead of funding something else.
The holdback is not open-ended. The policy sets a deadline to finish the work and claim the withheld depreciation — commonly 180 days to a year. If the work is never completed, the money is never paid, and an RCV claim that is never finished pays exactly what an ACV claim would have paid.
The roof-only trap
Your house can be insured at replacement cost while the roof alone is settled at actual cash value. Carriers increasingly attach a roof surfacing payment schedule or an actual cash value roof endorsement, which settles roof claims at actual cash value — or on a sliding scale tied to roof age — even when the rest of the home is replacement cost. The settlement basis that binds you is printed on your own declarations page, and the endorsement list is where the roof-only change hides.
What is not covered at all is a separate question from how a covered loss is valued: the home insurance exclusions guide covers what a standard policy does not pay for in the first place. ACV vs RCV decides the size of the cheque for a loss the policy does cover.
Which costs more
RCV is the broader coverage, and it generally carries the higher premium, because it pays more in claims. ACV usually costs less in premium — and on an ageing roof it is sometimes the only settlement basis an insurer will write at all. The trade is straightforward: a lower premium now against a much larger out-of-pocket payment after a loss.
For a new roof the difference is small, because there is little depreciation to deduct. For a roof fifteen or twenty years into its life, the difference can be most of the claim — which is when the cheaper premium stops looking cheap.
What to check before you choose
Pull your declarations page and read the endorsement list: the settlement basis for the dwelling, for the roof, and for personal property can all differ, and the roof schedule is the one that surprises people. Check the roof's age against any payment schedule, the deductible that applies to wind and hail, whether depreciation is applied to labour as well as materials — which varies by policy and state, so check the estimate — and the deadline for recovering the withheld depreciation.
And check the amount itself: the homeowners cost calculator on this site estimates cover from living area and rebuild cost per square foot, which is the replacement-cost figure the settlement is measured against. A dwelling insured below its rebuild cost is underinsured on either basis.
Worked example
Consider an ILLUSTRATIVE roof. Replacement cost is $20,000. The roof is 15 years old with an expected life of 25 years, so straight-line depreciation is 60% — $12,000 — and the deductible is $1,500. Under an ACV policy the cheque is $20,000 minus $12,000 depreciation minus the $1,500 deductible: $6,500, and the other $13,500 is on you. Under an RCV policy you receive that same $6,500 up front, and after the roof is installed and the paperwork submitted, the insurer releases the $12,000 in recoverable depreciation — your total out-of-pocket is the $1,500 deductible. These are ILLUSTRATIVE figures to show the arithmetic; they describe no real roof or claim.
Illustrative example only — not a fact about any real policy.