Roofing Replacement Cost Estimator
Estimate the installed cost, life-cycle expenses, and potential payback from replacing a residential roof with location and roof-type adjustments.
Roof specifications
Multiplier: 1.00×
Financial assumptions
Roof type multiplier
1.00×
Total installed cost
$20,020
Annualized cost
$985 / yr
NPV
-$12,828
Payback
—
IRR
-5.7%
Cumulative net cash flow
Modeled over 30 years
Highlights
With the current assumptions the project does not pay back within the selected horizon.
Over 30 years, total maintenance spends reach $9,515 and the modeled NPV is -$12,828.
Year-by-year cash flow
| Year | Installed cost | Maintenance | Savings / uplift | Net cash flow | Cumulative |
|---|---|---|---|---|---|
| 0 | $20,020 | — | $5,000 | -$15,020 | -$15,020 |
| 1 | — | $200 | $300 | $100 | -$14,920 |
| 2 | — | $206 | $309 | $103 | -$14,817 |
| 3 | — | $212 | $318 | $106 | -$14,711 |
| 4 | — | $219 | $328 | $109 | -$14,602 |
| 5 | — | $225 | $338 | $113 | -$14,489 |
| 6 | — | $232 | $348 | $116 | -$14,373 |
| 7 | — | $239 | $358 | $119 | -$14,254 |
| 8 | — | $246 | $369 | $123 | -$14,131 |
| 9 | — | $253 | $380 | $127 | -$14,004 |
| 10 | — | $261 | $391 | $130 | -$13,874 |
| 11 | — | $269 | $403 | $134 | -$13,739 |
| 12 | — | $277 | $415 | $138 | -$13,601 |
| 13 | — | $285 | $428 | $143 | -$13,458 |
| 14 | — | $294 | $441 | $147 | -$13,311 |
| 15 | — | $303 | $454 | $151 | -$13,160 |
| 16 | — | $312 | $467 | $156 | -$13,004 |
| 17 | — | $321 | $481 | $160 | -$12,844 |
| 18 | — | $331 | $496 | $165 | -$12,679 |
| 19 | — | $340 | $511 | $170 | -$12,508 |
| 20 | — | $351 | $526 | $175 | -$12,333 |
| 21 | — | $361 | $542 | $181 | -$12,152 |
| 22 | — | $372 | $558 | $186 | -$11,966 |
| 23 | — | $383 | $575 | $192 | -$11,775 |
| 24 | — | $395 | $592 | $197 | -$11,577 |
| 25 | — | $407 | $610 | $203 | -$11,374 |
| 26 | — | $419 | $628 | $209 | -$11,165 |
| 27 | — | $431 | $647 | $216 | -$10,949 |
| 28 | — | $444 | $666 | $222 | -$10,727 |
| 29 | — | $458 | $686 | $229 | -$10,498 |
| 30 | — | $471 | $707 | $236 | -$10,262 |
source: calestimator.com/roofing-replacement-calculator
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How to use the Roofing Replacement Calculator
Budget for shingles, underlayment, flashing, and labor based on roof size and material choices.
- Measure roof squares or enter the home’s footprint and pitch to estimate area.
- Choose shingle type—three-tab, architectural, metal, or tile—and note manufacturer warranties.
- Add tear-off, disposal, decking repair, and skylight costs.
- Review the total project estimate and compare bids from licensed roofers.
Roofing Replacement Calculator key terms
Knowing how each field influences the results keeps the math grounded in reality.
Roof square
Equal to 100 square feet. Material pricing is typically quoted per square.
Ice and water shield
Self-adhering membrane installed along eaves and valleys to prevent leaks. Adds to material cost but protects against freeze-thaw damage.
Warranty tiers
Manufacturer and contractor warranties vary. Premium systems may require certified installers.
Roofing Replacement Calculator planning ideas
Try running a few “what if” scenarios to translate the numbers into real-world decisions.
Insurance claim
Estimate replacement cost so you can verify insurer payouts after storms.
Energy-efficient upgrades
Compare cool-roof materials or solar shingles to traditional products to see if utility savings justify the premium.
Partial replacement
Model re-roofing only damaged sections to understand whether a full tear-off is more cost-effective.
Frequently asked questions
How long does a new roof last?
Asphalt shingles last 20–30 years, while metal or tile can exceed 50. Use the calculator to plan for the next replacement cycle accordingly.
Should I layer new shingles over old ones?
Building codes often limit you to two layers, and skipping a tear-off can hide deck damage. Pricing both options clarifies the best approach.