Roofing Tools

Roof Depreciation Calculator

Roof depreciation is the reduction from replacement cost used to estimate an older roof’s actual cash value. Age and condition can affect roof coverage and value. [3] Start with a material’s published service-life range, edit the assumed life, or enter a documented depreciation percentage. This is not a roof inspection or an insurer schedule.

Results

Estimated roof ACV, before deductible

$12,600

ACV is the modeled value after depreciation, not the first check. The deductible is shown separately below.

Replacement cost (RCV): $18,000
Depreciation (30%): $5,400
Actual cash value (ACV): $12,600
Deductible: $2,000
Estimated initial payment: $10,600
Potentially recoverable depreciation: $5,400
Additional payment from recovery: $5,400
Estimated potential total payment: $16,000

How this was calculated

RCV = $18,000
Depreciation rate = min(9 ÷ 30 × 100%, 100% cap) = 30%
Depreciation = $18,000 × 30% = $5,400
ACV = $18,000 − $5,400 = $12,600
Initial payment = max($0, $12,600 − $2,000) = $10,600
Potential total = max($0, $18,000 − $2,000) = $16,000
Additional recovery = $16,000 − $10,600 = $5,400

Policy language, the insurer’s method, state rules, property condition, repair spending, limits, and exclusions can change these estimates. Math keeps full precision; displayed amounts are rounded to cents and may differ by a cent when added.

About these assumptions

Start with your estimate or use the editable example. All amounts are US dollars, not national cost averages. Enter replacement cost (RCV), not the first check.
Published guidance for architectural asphalt shingles: 30–50 years. Selecting a material sets life to the 30-year editable starting assumption; you can override it. Source. Starting lives are editable assumptions, not insurer depreciation schedules. Architectural shingles start at 30 years; other materials use the selected range midpoint. Warranty duration is not service life. Climate, installation, maintenance, condition, and policy terms can change the result.
Expected useful life is an editable example assumption, not a universal insurer schedule.
Maximum depreciation is an editable modeling assumption: 100% by default. Enter the cap from your estimate or policy if different.
The deductible is applied once to the claim, not again to the recovery payment.
Recoverable depreciation is an assumption, not a coverage decision. Recovery usually requires completed repairs and proof within the policy deadline. ACV-only policies may not pay it.

Worked example: architectural shingles

For an illustrative $18,000 roof, age 9 and an editable 30-year useful life give 30% depreciation. The starting life uses the lower end of the 30–50-year range shown below—not an insurer’s recommended life.

9 ÷ 30 × 100 = 30%
Depreciation: $5,400
ACV before deductible: $12,600
After $2,000 deductible: $10,600

Changing useful life changes this estimate without changing the roof itself. Use documented age and condition information when comparing the model with an adjuster’s estimate.

Roof depreciation formula

depreciation % = min(cap %, age ÷ useful life × 100)
  or min(cap %, manual override %)
depreciation = replacement cost × depreciation % ÷ 100
ACV = replacement cost − depreciation
initial modeled payment = max(0, ACV − deductible)
potential total, if recoverable = max(0, replacement cost − deductible)
potential total, if not recoverable = initial modeled payment

The selected material supplies a starting life only. It does not change the formula, decide coverage, or establish how much life remains.

Limitations

This does not determine coverage or a claim payment. Policy language, the insurer’s method, state rules, and property condition can change the result.
Straight-line depreciation and the editable 100% default cap are modeling assumptions, not insurer rules. A manual percentage replaces age/life math but remains subject to the cap.
Potential recovery usually requires completing eligible repairs, documenting the work, and meeting a policy deadline. The toggle does not verify those conditions; ACV-only coverage may not provide recovery.
Policy limits, separate deductibles, line-item depreciation, actual repair spending, and coverage exclusions are not modeled. No allowance for taxes, overhead, or code upgrades is added automatically; include only the scope you intend to compare.
Service life is not warranty duration. Climate, installation, maintenance, and condition affect roof performance. Covering-life figures do not establish the life of underlayment, flashings, or fasteners.

Published roof lifespans and editable starting points

Starting lives are editable assumptions, not insurer depreciation schedules. Architectural shingles start at 30 years; other materials use the selected range midpoint. Warranty duration is not service life. Climate, installation, maintenance, condition, and policy terms can change the result.

Roof covering service-life ranges, editable starting assumptions, and sources
Material	Published years	Starting life	Source
3-tab asphalt shingles	15–20	17.5 years	[5] This Old House
Architectural asphalt shingles	30–50	30 years	[7] Angi
Metal roofing	40–80	60 years	[4] InterNACHI
Clay or concrete tile	50–100	75 years	[6] Angi
Wood shakes	25–50	37.5 years	[6] Angi
Natural slate	60–150	105 years	[4] InterNACHI

Sources disagree; these are not universal minimums or maximums. Architectural shingles display Angi’s maintained-roof range, but start at 30 years, consistent with InterNACHI’s shorter service-life guidance. The 30-year default is an editable modeling choice.

Claim assumptions can be shorter than published service-life ranges. One Texas roofing contractor reports 25–30 years as a common architectural-shingle baseline on claims. [8] That is a regional practitioner’s report, not a nationwide adjuster standard. Ask which useful life your adjuster used.

3-tab asphalt shingles: This Old House gives 15–20 years for basic three-tab shingles. InterNACHI lists a 20-year point estimate. The 17.5-year midpoint is an editable assumption, not an insurer schedule or warranty.
Architectural asphalt shingles: Angi gives 30–50 years with proper maintenance. The editable default is 30 years, not the 40-year midpoint, and matches InterNACHI’s 30-year service-life point estimate. Neither source establishes an insurer depreciation schedule. Use the documented life on your estimate when available; warranty duration is not service life.
Metal roofing: InterNACHI’s generic metal range is 40–80 years under normal wear and recommended maintenance; Angi gives 30–50 years. Metal types, coatings and fastening systems differ; copper is separately listed by both sources. The 60-year midpoint is an editable assumption, not an insurer schedule or coating warranty.
Clay or concrete tile: Angi groups clay/concrete tile at 50–100 years. InterNACHI instead lists 100+ years; 100 is not a hard upper bound. These are roof-covering estimates, not the life of every underlayment, flashing or fastening component. The 75-year midpoint is an editable assumption, not an insurer schedule or warranty.
Wood shakes: Angi’s 25–50-year row combines wood shakes and shingles; it is not shake-grade-specific. InterNACHI lists generic wood at 25 years. Moisture, ventilation, maintenance and installation matter. The 37.5-year midpoint is an editable assumption, not an insurer schedule or warranty.
Natural slate: InterNACHI gives slate 60–150 years, corroborated by Angi. Natural slate only: InterNACHI separately lists simulated slate at 10–35 years. The 105-year midpoint is an editable assumption, not an insurer schedule; it does not predict the life of underlayment or flashings.

For a roof older than its assumed life, the editable cap stops the model’s depreciation from increasing indefinitely. That does not prove the roof has failed. An old or worn-out roof alone does not establish an insured replacement claim. [3]

Common questions

Is this my insurer’s roof depreciation schedule?

No. It uses straight-line age divided by useful life, or your manual percentage, subject to an editable cap. Published roof lifespans describe service life, not insurance settlement rules.

Why does the starting useful life differ by material?

The table collects published service-life guidance for each covering. Architectural shingles start at 30 years; other starting lives use range midpoints. These are editable assumptions, not insurer schedules. Edit the life to match your documented estimate.

Can I use a lifetime warranty as the useful life?

Do not treat warranty duration as expected service life. Warranty terms and roof performance are different things. Use material and condition information, and review any depreciation method stated in your estimate or policy.

What happens if my roof is older than the useful life?

The model stops depreciation at the selected cap, which defaults to 100%. This is an arithmetic limit, not an inspection finding or a statement that an insurer assigns the roof no value.

Does depreciation mean insurance owes me a new roof?

No. Age and wear alone do not establish an insured loss. Cause of damage, policy terms, condition, the insurer’s method, and state rules affect coverage and any payment.

Related guides

Sources and methodology

Insurance explanations use Texas Department of Insurance consumer guidance, not nationwide payment rules. The arithmetic is a simplified model, not a published insurer schedule. Example dollar amounts are editable illustrations, not market repair prices.

Straight-line age divided by useful life, or a manual percentage override, limited by the editable depreciation cap. 100% is a modeling ceiling, not a claim that an insurer depreciates property fully. Policy language, the insurer’s method, state rules, and property condition can change the result.

[1] Texas Department of Insurance — Home insurance guide. Retrieved 2026-09-23. Texas consumer guidance. Definitions and repair-claim payment stages support the explanations, not a universal settlement formula. No national repair-cost figures are taken from this source.
[2] Texas Department of Insurance — Replacement cost or actual cash value?. Retrieved 2026-09-23. Illustrates the distinction between replacement-cost and actual-cash-value roof coverage. Its sample age/value figures are not adopted as a depreciation schedule.
[3] Texas Department of Insurance — Insurance and your roof. Retrieved 2026-09-23. Roof-specific Texas guidance. This shorter page describes further payment after repairs start, whereas the full guide describes the bill for a finished job. We do not universalize either timing: policy requirements and the adjuster's instructions must be checked.
[4] InterNACHI — Standard Estimated Life Expectancy Chart for Homes. Retrieved 2026-09-23. Published service-life guidance only; no cost figures are used.
[5] This Old House — Comparing Roofing Materials. Retrieved 2026-09-23. Published service-life guidance only; no cost figures are used.
[6] Angi — Here’s the Average Lifespan of a Roof. Retrieved 2026-09-23. Published service-life guidance only; no cost figures are used.
[7] Angi — What Are Architectural Shingles?. Retrieved 2026-09-23. Published service-life guidance only; no cost figures are used.
[8] Roof Raiders & Co — ACV vs RCV for Texas Homeowners. Retrieved 2026-09-24. This Texas contractor describes 25–30 years as an architectural-shingle useful-life baseline on claims. This supports an attributed example, not a claim about all adjusters or insurers.

This tool provides an educational estimate only. Insurance companies, contractors, and building officials may calculate these figures differently depending on policy language, property condition, local pricing, and applicable codes.

Disclaimer: Calculators and information on this site are provided for educational and estimating purposes only. Results do not determine insurance coverage, claim payments, repair requirements, or professional recommendations.